From 705c4d24c9c61edffc82864bf9c24384dc29a8d7 Mon Sep 17 00:00:00 2001 From: George Hazan Date: Mon, 18 Mar 2024 12:13:54 +0300 Subject: litehtml - lightweight html renderer --- libs/litehtml/CMakeLists.txt | 251 + libs/litehtml/LICENSE | 24 + libs/litehtml/README.md | 38 + libs/litehtml/cmake/litehtmlConfig.cmake | 3 + libs/litehtml/containers/cairo/cairo_borders.cpp | 342 + libs/litehtml/containers/cairo/cairo_borders.h | 69 + .../litehtml/containers/cairo/cairo_images_cache.h | 91 + libs/litehtml/containers/cairo/container_cairo.cpp | 539 + libs/litehtml/containers/cairo/container_cairo.h | 88 + .../containers/cairo/container_cairo_pango.cpp | 180 + .../containers/cairo/container_cairo_pango.h | 37 + libs/litehtml/containers/haiku/container_haiku.cpp | 568 + libs/litehtml/containers/haiku/container_haiku.h | 87 + libs/litehtml/containers/test/Bitmap.cpp | 129 + libs/litehtml/containers/test/Bitmap.h | 36 + libs/litehtml/containers/test/Font.cpp | 126 + libs/litehtml/containers/test/Font.h | 19 + libs/litehtml/containers/test/fonts/OFL.txt | 94 + libs/litehtml/containers/test/fonts/readme.txt | 12 + .../test/fonts/terminus-ascii-bold-12px.yaff | 1463 ++ .../test/fonts/terminus-ascii-bold-14px.yaff | 1656 ++ .../test/fonts/terminus-ascii-bold-16px.yaff | 1848 ++ .../test/fonts/terminus-ascii-bold-18px.yaff | 2040 ++ .../test/fonts/terminus-ascii-bold-20px.yaff | 2232 ++ .../test/fonts/terminus-ascii-bold-22px.yaff | 2424 ++ .../test/fonts/terminus-ascii-bold-24px.yaff | 2616 +++ .../test/fonts/terminus-ascii-bold-28px.yaff | 3000 +++ .../test/fonts/terminus-ascii-bold-32px.yaff | 3383 +++ libs/litehtml/containers/test/lodepng.cpp | 6661 ++++++ libs/litehtml/containers/test/lodepng.h | 2085 ++ libs/litehtml/containers/test/test_container.cpp | 94 + libs/litehtml/containers/test/test_container.h | 42 + .../containers/windows/cairo/cairo_font.cpp | 374 + .../litehtml/containers/windows/cairo/cairo_font.h | 120 + .../containers/windows/cairo/windows_container.cpp | 194 + .../containers/windows/cairo/windows_container.h | 39 + .../windows/gdiplus/gdiplus_container.cpp | 241 + .../containers/windows/gdiplus/gdiplus_container.h | 23 + .../containers/windows/win32/win32_container.cpp | 426 + .../containers/windows/win32/win32_container.h | 75 + libs/litehtml/include/litehtml.h | 11 + libs/litehtml/include/litehtml/background.h | 69 + libs/litehtml/include/litehtml/borders.h | 345 + libs/litehtml/include/litehtml/codepoint.h | 51 + libs/litehtml/include/litehtml/css_length.h | 119 + libs/litehtml/include/litehtml/css_margins.h | 44 + libs/litehtml/include/litehtml/css_offsets.h | 44 + libs/litehtml/include/litehtml/css_position.h | 28 + libs/litehtml/include/litehtml/css_properties.h | 673 + libs/litehtml/include/litehtml/css_selector.h | 300 + libs/litehtml/include/litehtml/document.h | 134 + .../litehtml/include/litehtml/document_container.h | 71 + libs/litehtml/include/litehtml/el_anchor.h | 18 + libs/litehtml/include/litehtml/el_base.h | 17 + libs/litehtml/include/litehtml/el_before_after.h | 39 + libs/litehtml/include/litehtml/el_body.h | 17 + libs/litehtml/include/litehtml/el_break.h | 17 + libs/litehtml/include/litehtml/el_cdata.h | 19 + libs/litehtml/include/litehtml/el_comment.h | 25 + libs/litehtml/include/litehtml/el_div.h | 17 + libs/litehtml/include/litehtml/el_font.h | 17 + libs/litehtml/include/litehtml/el_image.h | 29 + libs/litehtml/include/litehtml/el_link.h | 18 + libs/litehtml/include/litehtml/el_para.h | 18 + libs/litehtml/include/litehtml/el_script.h | 21 + libs/litehtml/include/litehtml/el_space.h | 21 + libs/litehtml/include/litehtml/el_style.h | 21 + libs/litehtml/include/litehtml/el_table.h | 25 + libs/litehtml/include/litehtml/el_td.h | 17 + libs/litehtml/include/litehtml/el_text.h | 31 + libs/litehtml/include/litehtml/el_title.h | 18 + libs/litehtml/include/litehtml/el_tr.h | 17 + libs/litehtml/include/litehtml/element.h | 234 + libs/litehtml/include/litehtml/flex_item.h | 137 + libs/litehtml/include/litehtml/flex_line.h | 56 + .../litehtml/include/litehtml/formatting_context.h | 54 + libs/litehtml/include/litehtml/html.h | 88 + libs/litehtml/include/litehtml/html_tag.h | 139 + libs/litehtml/include/litehtml/iterators.h | 84 + libs/litehtml/include/litehtml/line_box.h | 171 + libs/litehtml/include/litehtml/master_css.h | 376 + libs/litehtml/include/litehtml/media_query.h | 77 + libs/litehtml/include/litehtml/num_cvt.h | 19 + libs/litehtml/include/litehtml/os_types.h | 30 + libs/litehtml/include/litehtml/render_block.h | 40 + .../include/litehtml/render_block_context.h | 31 + libs/litehtml/include/litehtml/render_flex.h | 33 + libs/litehtml/include/litehtml/render_image.h | 25 + libs/litehtml/include/litehtml/render_inline.h | 38 + .../include/litehtml/render_inline_context.h | 56 + libs/litehtml/include/litehtml/render_item.h | 387 + libs/litehtml/include/litehtml/render_table.h | 56 + libs/litehtml/include/litehtml/string_id.h | 306 + libs/litehtml/include/litehtml/style.h | 215 + libs/litehtml/include/litehtml/stylesheet.h | 47 + libs/litehtml/include/litehtml/table.h | 248 + libs/litehtml/include/litehtml/tstring_view.h | 136 + libs/litehtml/include/litehtml/types.h | 1000 + libs/litehtml/include/litehtml/url.h | 139 + libs/litehtml/include/litehtml/url_path.h | 51 + libs/litehtml/include/litehtml/utf8_strings.h | 52 + libs/litehtml/include/litehtml/web_color.h | 63 + libs/litehtml/litehtml.vcxproj | 303 + libs/litehtml/litehtml.vcxproj.filters | 421 + libs/litehtml/src/codepoint.cpp | 82 + libs/litehtml/src/css_borders.cpp | 7 + libs/litehtml/src/css_length.cpp | 77 + libs/litehtml/src/css_properties.cpp | 465 + libs/litehtml/src/css_selector.cpp | 323 + libs/litehtml/src/document.cpp | 1068 + libs/litehtml/src/document_container.cpp | 44 + libs/litehtml/src/el_anchor.cpp | 26 + libs/litehtml/src/el_base.cpp | 13 + libs/litehtml/src/el_before_after.cpp | 214 + libs/litehtml/src/el_body.cpp | 12 + libs/litehtml/src/el_break.cpp | 13 + libs/litehtml/src/el_cdata.cpp | 20 + libs/litehtml/src/el_comment.cpp | 25 + libs/litehtml/src/el_div.cpp | 18 + libs/litehtml/src/el_font.cpp | 57 + libs/litehtml/src/el_image.cpp | 120 + libs/litehtml/src/el_link.cpp | 39 + libs/litehtml/src/el_para.cpp | 18 + libs/litehtml/src/el_script.cpp | 30 + libs/litehtml/src/el_space.cpp | 44 + libs/litehtml/src/el_style.cpp | 36 + libs/litehtml/src/el_table.cpp | 55 + libs/litehtml/src/el_td.cpp | 43 + libs/litehtml/src/el_text.cpp | 140 + libs/litehtml/src/el_title.cpp | 16 + libs/litehtml/src/el_tr.cpp | 28 + libs/litehtml/src/element.cpp | 478 + libs/litehtml/src/flex_item.cpp | 498 + libs/litehtml/src/flex_line.cpp | 454 + libs/litehtml/src/formatting_context.cpp | 441 + libs/litehtml/src/gumbo/CMakeLists.txt | 75 + libs/litehtml/src/gumbo/LICENSE | 202 + libs/litehtml/src/gumbo/attribute.c | 44 + libs/litehtml/src/gumbo/char_ref.c | 23069 +++++++++++++++++++ libs/litehtml/src/gumbo/char_ref.rl | 2554 ++ libs/litehtml/src/gumbo/error.c | 279 + libs/litehtml/src/gumbo/include/gumbo.h | 675 + libs/litehtml/src/gumbo/include/gumbo/attribute.h | 37 + libs/litehtml/src/gumbo/include/gumbo/char_ref.h | 60 + libs/litehtml/src/gumbo/include/gumbo/error.h | 227 + .../src/gumbo/include/gumbo/insertion_mode.h | 57 + libs/litehtml/src/gumbo/include/gumbo/parser.h | 57 + .../src/gumbo/include/gumbo/string_buffer.h | 84 + .../src/gumbo/include/gumbo/string_piece.h | 38 + libs/litehtml/src/gumbo/include/gumbo/tag_enum.h | 153 + libs/litehtml/src/gumbo/include/gumbo/tag_gperf.h | 105 + libs/litehtml/src/gumbo/include/gumbo/tag_sizes.h | 4 + .../litehtml/src/gumbo/include/gumbo/tag_strings.h | 153 + libs/litehtml/src/gumbo/include/gumbo/token_type.h | 41 + libs/litehtml/src/gumbo/include/gumbo/tokenizer.h | 123 + .../src/gumbo/include/gumbo/tokenizer_states.h | 103 + libs/litehtml/src/gumbo/include/gumbo/utf8.h | 132 + libs/litehtml/src/gumbo/include/gumbo/util.h | 62 + libs/litehtml/src/gumbo/include/gumbo/vector.h | 67 + libs/litehtml/src/gumbo/parser.c | 4188 ++++ libs/litehtml/src/gumbo/string_buffer.c | 110 + libs/litehtml/src/gumbo/string_piece.c | 48 + libs/litehtml/src/gumbo/tag.c | 95 + libs/litehtml/src/gumbo/tag.in | 150 + libs/litehtml/src/gumbo/tokenizer.c | 2897 +++ libs/litehtml/src/gumbo/utf8.c | 270 + libs/litehtml/src/gumbo/util.c | 58 + libs/litehtml/src/gumbo/vector.c | 123 + libs/litehtml/src/gumbo/visualc/include/strings.h | 4 + libs/litehtml/src/html.cpp | 290 + libs/litehtml/src/html_tag.cpp | 1711 ++ libs/litehtml/src/iterators.cpp | 101 + libs/litehtml/src/line_box.cpp | 717 + libs/litehtml/src/media_query.cpp | 430 + libs/litehtml/src/num_cvt.cpp | 108 + libs/litehtml/src/render_block.cpp | 348 + libs/litehtml/src/render_block_context.cpp | 154 + libs/litehtml/src/render_flex.cpp | 448 + libs/litehtml/src/render_image.cpp | 148 + libs/litehtml/src/render_inline_context.cpp | 409 + libs/litehtml/src/render_item.cpp | 1096 + libs/litehtml/src/render_table.cpp | 496 + libs/litehtml/src/string_id.cpp | 54 + libs/litehtml/src/strtod.cpp | 275 + libs/litehtml/src/style.cpp | 1220 + libs/litehtml/src/stylesheet.cpp | 225 + libs/litehtml/src/table.cpp | 609 + libs/litehtml/src/tstring_view.cpp | 46 + libs/litehtml/src/url.cpp | 163 + libs/litehtml/src/url_path.cpp | 86 + libs/litehtml/src/utf8_strings.cpp | 99 + libs/litehtml/src/web_color.cpp | 274 + 192 files changed, 91947 insertions(+) create mode 100644 libs/litehtml/CMakeLists.txt create mode 100644 libs/litehtml/LICENSE create mode 100644 libs/litehtml/README.md create mode 100644 libs/litehtml/cmake/litehtmlConfig.cmake create mode 100644 libs/litehtml/containers/cairo/cairo_borders.cpp create mode 100644 libs/litehtml/containers/cairo/cairo_borders.h create mode 100644 libs/litehtml/containers/cairo/cairo_images_cache.h create mode 100644 libs/litehtml/containers/cairo/container_cairo.cpp create mode 100644 libs/litehtml/containers/cairo/container_cairo.h create mode 100644 libs/litehtml/containers/cairo/container_cairo_pango.cpp create mode 100644 libs/litehtml/containers/cairo/container_cairo_pango.h create mode 100644 libs/litehtml/containers/haiku/container_haiku.cpp create mode 100644 libs/litehtml/containers/haiku/container_haiku.h create mode 100644 libs/litehtml/containers/test/Bitmap.cpp create mode 100644 libs/litehtml/containers/test/Bitmap.h create mode 100644 libs/litehtml/containers/test/Font.cpp create mode 100644 libs/litehtml/containers/test/Font.h create mode 100644 libs/litehtml/containers/test/fonts/OFL.txt create mode 100644 libs/litehtml/containers/test/fonts/readme.txt create mode 100644 libs/litehtml/containers/test/fonts/terminus-ascii-bold-12px.yaff create mode 100644 libs/litehtml/containers/test/fonts/terminus-ascii-bold-14px.yaff create mode 100644 libs/litehtml/containers/test/fonts/terminus-ascii-bold-16px.yaff create mode 100644 libs/litehtml/containers/test/fonts/terminus-ascii-bold-18px.yaff create mode 100644 libs/litehtml/containers/test/fonts/terminus-ascii-bold-20px.yaff create mode 100644 libs/litehtml/containers/test/fonts/terminus-ascii-bold-22px.yaff create mode 100644 libs/litehtml/containers/test/fonts/terminus-ascii-bold-24px.yaff create mode 100644 libs/litehtml/containers/test/fonts/terminus-ascii-bold-28px.yaff create mode 100644 libs/litehtml/containers/test/fonts/terminus-ascii-bold-32px.yaff create mode 100644 libs/litehtml/containers/test/lodepng.cpp create mode 100644 libs/litehtml/containers/test/lodepng.h create mode 100644 libs/litehtml/containers/test/test_container.cpp create mode 100644 libs/litehtml/containers/test/test_container.h create mode 100644 libs/litehtml/containers/windows/cairo/cairo_font.cpp create mode 100644 libs/litehtml/containers/windows/cairo/cairo_font.h create mode 100644 libs/litehtml/containers/windows/cairo/windows_container.cpp create mode 100644 libs/litehtml/containers/windows/cairo/windows_container.h create mode 100644 libs/litehtml/containers/windows/gdiplus/gdiplus_container.cpp create mode 100644 libs/litehtml/containers/windows/gdiplus/gdiplus_container.h create mode 100644 libs/litehtml/containers/windows/win32/win32_container.cpp create mode 100644 libs/litehtml/containers/windows/win32/win32_container.h create mode 100644 libs/litehtml/include/litehtml.h create mode 100644 libs/litehtml/include/litehtml/background.h create mode 100644 libs/litehtml/include/litehtml/borders.h create mode 100644 libs/litehtml/include/litehtml/codepoint.h create mode 100644 libs/litehtml/include/litehtml/css_length.h create mode 100644 libs/litehtml/include/litehtml/css_margins.h create mode 100644 libs/litehtml/include/litehtml/css_offsets.h create mode 100644 libs/litehtml/include/litehtml/css_position.h create mode 100644 libs/litehtml/include/litehtml/css_properties.h create mode 100644 libs/litehtml/include/litehtml/css_selector.h create mode 100644 libs/litehtml/include/litehtml/document.h create mode 100644 libs/litehtml/include/litehtml/document_container.h create mode 100644 libs/litehtml/include/litehtml/el_anchor.h create mode 100644 libs/litehtml/include/litehtml/el_base.h create mode 100644 libs/litehtml/include/litehtml/el_before_after.h create mode 100644 libs/litehtml/include/litehtml/el_body.h create mode 100644 libs/litehtml/include/litehtml/el_break.h create mode 100644 libs/litehtml/include/litehtml/el_cdata.h create mode 100644 libs/litehtml/include/litehtml/el_comment.h create mode 100644 libs/litehtml/include/litehtml/el_div.h create mode 100644 libs/litehtml/include/litehtml/el_font.h create mode 100644 libs/litehtml/include/litehtml/el_image.h create mode 100644 libs/litehtml/include/litehtml/el_link.h create mode 100644 libs/litehtml/include/litehtml/el_para.h create mode 100644 libs/litehtml/include/litehtml/el_script.h create mode 100644 libs/litehtml/include/litehtml/el_space.h create mode 100644 libs/litehtml/include/litehtml/el_style.h create mode 100644 libs/litehtml/include/litehtml/el_table.h create mode 100644 libs/litehtml/include/litehtml/el_td.h create mode 100644 libs/litehtml/include/litehtml/el_text.h create mode 100644 libs/litehtml/include/litehtml/el_title.h create mode 100644 libs/litehtml/include/litehtml/el_tr.h create mode 100644 libs/litehtml/include/litehtml/element.h create mode 100644 libs/litehtml/include/litehtml/flex_item.h create mode 100644 libs/litehtml/include/litehtml/flex_line.h create mode 100644 libs/litehtml/include/litehtml/formatting_context.h create mode 100644 libs/litehtml/include/litehtml/html.h create mode 100644 libs/litehtml/include/litehtml/html_tag.h create mode 100644 libs/litehtml/include/litehtml/iterators.h create mode 100644 libs/litehtml/include/litehtml/line_box.h create mode 100644 libs/litehtml/include/litehtml/master_css.h create mode 100644 libs/litehtml/include/litehtml/media_query.h create mode 100644 libs/litehtml/include/litehtml/num_cvt.h create mode 100644 libs/litehtml/include/litehtml/os_types.h create mode 100644 libs/litehtml/include/litehtml/render_block.h create mode 100644 libs/litehtml/include/litehtml/render_block_context.h create mode 100644 libs/litehtml/include/litehtml/render_flex.h create mode 100644 libs/litehtml/include/litehtml/render_image.h create mode 100644 libs/litehtml/include/litehtml/render_inline.h create mode 100644 libs/litehtml/include/litehtml/render_inline_context.h create mode 100644 libs/litehtml/include/litehtml/render_item.h create mode 100644 libs/litehtml/include/litehtml/render_table.h create mode 100644 libs/litehtml/include/litehtml/string_id.h create mode 100644 libs/litehtml/include/litehtml/style.h create mode 100644 libs/litehtml/include/litehtml/stylesheet.h create mode 100644 libs/litehtml/include/litehtml/table.h create mode 100644 libs/litehtml/include/litehtml/tstring_view.h create mode 100644 libs/litehtml/include/litehtml/types.h create mode 100644 libs/litehtml/include/litehtml/url.h create mode 100644 libs/litehtml/include/litehtml/url_path.h create mode 100644 libs/litehtml/include/litehtml/utf8_strings.h create mode 100644 libs/litehtml/include/litehtml/web_color.h create mode 100644 libs/litehtml/litehtml.vcxproj create mode 100644 libs/litehtml/litehtml.vcxproj.filters create mode 100644 libs/litehtml/src/codepoint.cpp create mode 100644 libs/litehtml/src/css_borders.cpp create mode 100644 libs/litehtml/src/css_length.cpp create mode 100644 libs/litehtml/src/css_properties.cpp create mode 100644 libs/litehtml/src/css_selector.cpp create mode 100644 libs/litehtml/src/document.cpp create mode 100644 libs/litehtml/src/document_container.cpp create mode 100644 libs/litehtml/src/el_anchor.cpp create mode 100644 libs/litehtml/src/el_base.cpp create mode 100644 libs/litehtml/src/el_before_after.cpp create mode 100644 libs/litehtml/src/el_body.cpp create mode 100644 libs/litehtml/src/el_break.cpp create mode 100644 libs/litehtml/src/el_cdata.cpp create mode 100644 libs/litehtml/src/el_comment.cpp create mode 100644 libs/litehtml/src/el_div.cpp create mode 100644 libs/litehtml/src/el_font.cpp create mode 100644 libs/litehtml/src/el_image.cpp create mode 100644 libs/litehtml/src/el_link.cpp create mode 100644 libs/litehtml/src/el_para.cpp create mode 100644 libs/litehtml/src/el_script.cpp create mode 100644 libs/litehtml/src/el_space.cpp create mode 100644 libs/litehtml/src/el_style.cpp create mode 100644 libs/litehtml/src/el_table.cpp create mode 100644 libs/litehtml/src/el_td.cpp create mode 100644 libs/litehtml/src/el_text.cpp create mode 100644 libs/litehtml/src/el_title.cpp create mode 100644 libs/litehtml/src/el_tr.cpp create mode 100644 libs/litehtml/src/element.cpp create mode 100644 libs/litehtml/src/flex_item.cpp create mode 100644 libs/litehtml/src/flex_line.cpp create mode 100644 libs/litehtml/src/formatting_context.cpp create mode 100644 libs/litehtml/src/gumbo/CMakeLists.txt create mode 100644 libs/litehtml/src/gumbo/LICENSE create mode 100644 libs/litehtml/src/gumbo/attribute.c create mode 100644 libs/litehtml/src/gumbo/char_ref.c create mode 100644 libs/litehtml/src/gumbo/char_ref.rl create mode 100644 libs/litehtml/src/gumbo/error.c create mode 100644 libs/litehtml/src/gumbo/include/gumbo.h create mode 100644 libs/litehtml/src/gumbo/include/gumbo/attribute.h create mode 100644 libs/litehtml/src/gumbo/include/gumbo/char_ref.h create mode 100644 libs/litehtml/src/gumbo/include/gumbo/error.h create mode 100644 libs/litehtml/src/gumbo/include/gumbo/insertion_mode.h create mode 100644 libs/litehtml/src/gumbo/include/gumbo/parser.h create mode 100644 libs/litehtml/src/gumbo/include/gumbo/string_buffer.h create mode 100644 libs/litehtml/src/gumbo/include/gumbo/string_piece.h create mode 100644 libs/litehtml/src/gumbo/include/gumbo/tag_enum.h create mode 100644 libs/litehtml/src/gumbo/include/gumbo/tag_gperf.h create mode 100644 libs/litehtml/src/gumbo/include/gumbo/tag_sizes.h create mode 100644 libs/litehtml/src/gumbo/include/gumbo/tag_strings.h create mode 100644 libs/litehtml/src/gumbo/include/gumbo/token_type.h create mode 100644 libs/litehtml/src/gumbo/include/gumbo/tokenizer.h create mode 100644 libs/litehtml/src/gumbo/include/gumbo/tokenizer_states.h create mode 100644 libs/litehtml/src/gumbo/include/gumbo/utf8.h create mode 100644 libs/litehtml/src/gumbo/include/gumbo/util.h create mode 100644 libs/litehtml/src/gumbo/include/gumbo/vector.h create mode 100644 libs/litehtml/src/gumbo/parser.c create mode 100644 libs/litehtml/src/gumbo/string_buffer.c create mode 100644 libs/litehtml/src/gumbo/string_piece.c create mode 100644 libs/litehtml/src/gumbo/tag.c create mode 100644 libs/litehtml/src/gumbo/tag.in create mode 100644 libs/litehtml/src/gumbo/tokenizer.c create mode 100644 libs/litehtml/src/gumbo/utf8.c create mode 100644 libs/litehtml/src/gumbo/util.c create mode 100644 libs/litehtml/src/gumbo/vector.c create mode 100644 libs/litehtml/src/gumbo/visualc/include/strings.h create mode 100644 libs/litehtml/src/html.cpp create mode 100644 libs/litehtml/src/html_tag.cpp create mode 100644 libs/litehtml/src/iterators.cpp create mode 100644 libs/litehtml/src/line_box.cpp create mode 100644 libs/litehtml/src/media_query.cpp create mode 100644 libs/litehtml/src/num_cvt.cpp create mode 100644 libs/litehtml/src/render_block.cpp create mode 100644 libs/litehtml/src/render_block_context.cpp create mode 100644 libs/litehtml/src/render_flex.cpp create mode 100644 libs/litehtml/src/render_image.cpp create mode 100644 libs/litehtml/src/render_inline_context.cpp create mode 100644 libs/litehtml/src/render_item.cpp create mode 100644 libs/litehtml/src/render_table.cpp create mode 100644 libs/litehtml/src/string_id.cpp create mode 100644 libs/litehtml/src/strtod.cpp create mode 100644 libs/litehtml/src/style.cpp create mode 100644 libs/litehtml/src/stylesheet.cpp create mode 100644 libs/litehtml/src/table.cpp create mode 100644 libs/litehtml/src/tstring_view.cpp create mode 100644 libs/litehtml/src/url.cpp create mode 100644 libs/litehtml/src/url_path.cpp create mode 100644 libs/litehtml/src/utf8_strings.cpp create mode 100644 libs/litehtml/src/web_color.cpp (limited to 'libs/litehtml') diff --git a/libs/litehtml/CMakeLists.txt b/libs/litehtml/CMakeLists.txt new file mode 100644 index 0000000000..056bba6c9d --- /dev/null +++ b/libs/litehtml/CMakeLists.txt @@ -0,0 +1,251 @@ +cmake_minimum_required(VERSION 3.11) + +project(litehtml LANGUAGES C CXX) + + +option(LITEHTML_BUILD_TESTING "enable testing for litehtml" ON) + +if(LITEHTML_BUILD_TESTING) + include(CTest) + enable_testing() +endif() + +# Soname +# MAJOR is incremented when symbols are removed or changed in an incompatible way +# MINOR is incremented when new symbols are added +set(PROJECT_MAJOR 0) +set(PROJECT_MINOR 0) + +option(EXTERNAL_GUMBO "Link against external gumbo instead of shipping a bundled copy" OFF) + +if(NOT EXTERNAL_GUMBO) + add_subdirectory(src/gumbo) +endif() + +set(SOURCE_LITEHTML + src/codepoint.cpp + src/css_length.cpp + src/css_selector.cpp + src/document.cpp + src/document_container.cpp + src/el_anchor.cpp + src/el_base.cpp + src/el_before_after.cpp + src/el_body.cpp + src/el_break.cpp + src/el_cdata.cpp + src/el_comment.cpp + src/el_div.cpp + src/element.cpp + src/el_font.cpp + src/el_image.cpp + src/el_link.cpp + src/el_para.cpp + src/el_script.cpp + src/el_space.cpp + src/el_style.cpp + src/el_table.cpp + src/el_td.cpp + src/el_text.cpp + src/el_title.cpp + src/el_tr.cpp + src/html.cpp + src/html_tag.cpp + src/iterators.cpp + src/media_query.cpp + src/style.cpp + src/stylesheet.cpp + src/table.cpp + src/tstring_view.cpp + src/url.cpp + src/url_path.cpp + src/utf8_strings.cpp + src/web_color.cpp + src/num_cvt.cpp + src/strtod.cpp + src/string_id.cpp + src/css_properties.cpp + src/line_box.cpp + src/css_borders.cpp + src/render_item.cpp + src/render_block_context.cpp + src/render_block.cpp + src/render_inline_context.cpp + src/render_table.cpp + src/render_flex.cpp + src/render_image.cpp + src/formatting_context.cpp + src/flex_item.cpp + src/flex_line.cpp) + +set(HEADER_LITEHTML + include/litehtml.h + include/litehtml/background.h + include/litehtml/borders.h + include/litehtml/codepoint.h + include/litehtml/css_length.h + include/litehtml/css_margins.h + include/litehtml/css_offsets.h + include/litehtml/css_position.h + include/litehtml/css_selector.h + include/litehtml/document.h + include/litehtml/document_container.h + include/litehtml/el_anchor.h + include/litehtml/el_base.h + include/litehtml/el_before_after.h + include/litehtml/el_body.h + include/litehtml/el_break.h + include/litehtml/el_cdata.h + include/litehtml/el_comment.h + include/litehtml/el_div.h + include/litehtml/el_font.h + include/litehtml/el_image.h + include/litehtml/el_link.h + include/litehtml/el_para.h + include/litehtml/el_script.h + include/litehtml/el_space.h + include/litehtml/el_style.h + include/litehtml/el_table.h + include/litehtml/el_td.h + include/litehtml/el_text.h + include/litehtml/el_title.h + include/litehtml/el_tr.h + include/litehtml/element.h + include/litehtml/html.h + include/litehtml/html_tag.h + include/litehtml/iterators.h + include/litehtml/media_query.h + include/litehtml/os_types.h + include/litehtml/style.h + include/litehtml/stylesheet.h + include/litehtml/table.h + include/litehtml/tstring_view.h + include/litehtml/types.h + include/litehtml/url.h + include/litehtml/url_path.h + include/litehtml/utf8_strings.h + include/litehtml/web_color.h + include/litehtml/num_cvt.h + include/litehtml/css_properties.h + include/litehtml/line_box.h + include/litehtml/render_item.h + include/litehtml/render_flex.h + include/litehtml/render_image.h + include/litehtml/render_inline.h + include/litehtml/render_table.h + include/litehtml/render_inline_context.h + include/litehtml/render_block_context.h + include/litehtml/render_block.h + include/litehtml/master_css.h + include/litehtml/string_id.h + include/litehtml/formatting_context.h + include/litehtml/flex_item.h + include/litehtml/flex_line.h +) + +set(TEST_LITEHTML + test/cssTest.cpp + test/mediaQueryTest.cpp + test/codepoint_test.cpp + test/tstring_view_test.cpp + test/url_test.cpp + test/url_path_test.cpp + test/render_test.cpp + containers/test/test_container.cpp + containers/test/Font.cpp + containers/test/Bitmap.cpp + containers/test/lodepng.cpp +) + +set(PROJECT_LIB_VERSION ${PROJECT_MAJOR}.${PROJECT_MINOR}.0) +set(PROJECT_SO_VERSION ${PROJECT_MAJOR}) + +if (MSVC) + # warning level 4 + add_compile_options(/W4) +else() + # additional warnings + add_compile_options(-Wall -Wextra -Wpedantic) +endif() + +add_library(${PROJECT_NAME} ${SOURCE_LITEHTML}) +set_target_properties(${PROJECT_NAME} PROPERTIES VERSION ${PROJECT_LIB_VERSION} SOVERSION ${PROJECT_SO_VERSION}) + +set_target_properties(${PROJECT_NAME} PROPERTIES + CXX_STANDARD 11 + C_STANDARD 99 + PUBLIC_HEADER "${HEADER_LITEHTML}" +) + +# Export litehtml includes. +target_include_directories(${PROJECT_NAME} PUBLIC + $ + $ + $) +target_include_directories(${PROJECT_NAME} PRIVATE include/${PROJECT_NAME}) + +# Gumbo +target_link_libraries(${PROJECT_NAME} PUBLIC gumbo) + +# install and export +install(TARGETS ${PROJECT_NAME} + EXPORT litehtmlTargets + RUNTIME DESTINATION bin COMPONENT libraries + ARCHIVE DESTINATION lib${LIB_SUFFIX} COMPONENT libraries + LIBRARY DESTINATION lib${LIB_SUFFIX} COMPONENT libraries + PUBLIC_HEADER DESTINATION include/litehtml +) +install(FILES cmake/litehtmlConfig.cmake DESTINATION lib${LIB_SUFFIX}/cmake/litehtml) +install(EXPORT litehtmlTargets FILE litehtmlTargets.cmake DESTINATION lib${LIB_SUFFIX}/cmake/litehtml) + +# Tests + +if (LITEHTML_BUILD_TESTING) + option(EXTERNAL_GTEST "Use external GoogleTest instead of fetching from GitHub" OFF) + + if (EXTERNAL_GTEST) + link_libraries("-Wl,--copy-dt-needed-entries") + else() + include(FetchContent) + FetchContent_Declare( + googletest + URL https://github.com/google/googletest/archive/609281088cfefc76f9d0ce82e1ff6c30cc3591e5.zip + ) + # For Windows: Prevent overriding the parent project's compiler/linker settings + set(gtest_force_shared_crt ON CACHE BOOL "" FORCE) + FetchContent_GetProperties(googletest) + if(NOT googletest_POPULATED) + FetchContent_Populate(googletest) + add_subdirectory(${googletest_SOURCE_DIR} ${googletest_BINARY_DIR}) + endif() + endif() + + enable_testing() + + set(TEST_NAME ${PROJECT_NAME}_tests) + + add_executable( + ${TEST_NAME} + ${TEST_LITEHTML} + ) + + set_target_properties(${TEST_NAME} PROPERTIES + CXX_STANDARD 11 + C_STANDARD 99 + PUBLIC_HEADER "${HEADER_LITEHTML}" + ) + + target_include_directories( + ${TEST_NAME} + PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/containers + ) + + target_link_libraries( + ${TEST_NAME} + ${PROJECT_NAME} + gtest_main + ) + + include(GoogleTest) + gtest_discover_tests(${TEST_NAME} WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/test) +endif() diff --git a/libs/litehtml/LICENSE b/libs/litehtml/LICENSE new file mode 100644 index 0000000000..601e1c7120 --- /dev/null +++ b/libs/litehtml/LICENSE @@ -0,0 +1,24 @@ +Copyright (c) 2013, Yuri Kobets (tordex) +All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are met: + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + * Neither the name of the nor the + names of its contributors may be used to endorse or promote products + derived from this software without specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND +ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +DISCLAIMED. IN NO EVENT SHALL BE LIABLE FOR ANY +DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND +ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. diff --git a/libs/litehtml/README.md b/libs/litehtml/README.md new file mode 100644 index 0000000000..ab897f517d --- /dev/null +++ b/libs/litehtml/README.md @@ -0,0 +1,38 @@ +# What is litehtml? + +**litehtml** is the lightweight HTML rendering engine with CSS2/CSS3 support. Note that **litehtml** itself does not draw any text, pictures or other graphics and that **litehtml** does not depend on any image/draw/font library. You are free to use any library to draw images, fonts and any other graphics. **litehtml** just parses HTML/CSS and places the HTML elements into the correct positions (renders HTML). To draw the HTML elements you have to implement the simple callback interface [document_container](https://github.com/litehtml/litehtml/wiki/document_container). This interface is really simple, check it out! The [document_container](https://github.com/litehtml/litehtml/wiki/document_container) implementation is required to render HTML correctly. + +# Where litehtml can be used + +**litehtml** can be used when you need to show HTML formatted text or even to create a mini-browser, but using it as a full-featured HTML engine is not recommended. Usually you don't need something like WebKit to show simple HTML tooltips or HTML-formatted text, **litehtml** is much better for these as it's more lightweight and easier to integrate into your application. + +## HTML Parser + +**litehtml** uses the [gumbo-parser](https://github.com/google/gumbo-parser) to parse HTML. Gumbo is an implementation of the HTML5 parsing algorithm implemented as a pure C99 library with no outside dependencies. It's designed to serve as a building block for other tools and libraries such as linters, validators, templating languages, and refactoring and analysis tools. + +## Compatibility + +**litehtml** is compatible with any platform supported by C++ and STL. For Windows MS Visual Studio 2013 is recommended. **litehtml** supports only UTF-8 strings. + +## Support for HTML and CSS standards + +Unfortunately **litehtml** is not fully compatible with HTML/CSS standards. There is lots of work to do to make **litehtml** work as well as modern browsers. But **litehtml** supports most HTML tags and CSS properties. You can find the list of supported CSS properties in [this table](https://docs.google.com/spreadsheet/ccc?key=0AvHXl5n24PuhdHdELUdhaUl4OGlncXhDcDJuM1JpMnc&usp=sharing). For most simple usecases the HTML/CSS features supported by **litehtml** are enough. Right now **litehtml** supports even some pages with very complex HTML/CSS designs. As an example the pages created with [bootstrap framework](http://getbootstrap.com/) are usually well formatted by **litehtml**. + +## Testing litehtml + +You can [download the simple browser](http://www.litehtml.com/download.html) (**litebrowser**) to test the **litehtml** rendering engine. + +The litebrowser source codes are available on GitHub: + * [For Windows](https://github.com/litehtml/litebrowser) + * [For Linux](https://github.com/litehtml/litebrowser-linux) + * [For Haiku](https://github.com/adamfowleruk/litebrowser-haiku) + +## License + +**litehtml** is distributed under [New BSD License](https://opensource.org/licenses/BSD-3-Clause). +The **gumbo-parser** is disributed under [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0) + +## Links + + * [source code](https://github.com/litehtml/litehtml) + * [website](http://www.litehtml.com/) diff --git a/libs/litehtml/cmake/litehtmlConfig.cmake b/libs/litehtml/cmake/litehtmlConfig.cmake new file mode 100644 index 0000000000..5eedcf43b6 --- /dev/null +++ b/libs/litehtml/cmake/litehtmlConfig.cmake @@ -0,0 +1,3 @@ +include(CMakeFindDependencyMacro) +find_dependency(gumbo) +include(${CMAKE_CURRENT_LIST_DIR}/litehtmlTargets.cmake) diff --git a/libs/litehtml/containers/cairo/cairo_borders.cpp b/libs/litehtml/containers/cairo/cairo_borders.cpp new file mode 100644 index 0000000000..21ae6db4cd --- /dev/null +++ b/libs/litehtml/containers/cairo/cairo_borders.cpp @@ -0,0 +1,342 @@ +#include +#include "cairo_borders.h" +#include + +#ifndef M_PI +# define M_PI 3.14159265358979323846 +#endif + +void cairo::add_path_arc(cairo_t* cr, double x, double y, double rx, double ry, double a1, double a2, bool neg) +{ + if(rx > 0 && ry > 0) + { + cairo_save(cr); + + cairo_translate(cr, x, y); + cairo_scale(cr, 1, ry / rx); + cairo_translate(cr, -x, -y); + + if(neg) + { + cairo_arc_negative(cr, x, y, rx, a1, a2); + } else + { + cairo_arc(cr, x, y, rx, a1, a2); + } + + cairo_restore(cr); + } else + { + cairo_move_to(cr, x, y); + } +} + +/** + * Draw border at the left side. Use the only function to draw all border by using rotation transfer + * @param cr cairo context + * @param left left position of the border + * @param top top position of the border + * @param bottom bottom position of the border + * @param data border data + */ +void cairo::border::draw_border() +{ + cairo_save(cr); + + if(radius_top_x && radius_top_y) + { + double start_angle = M_PI; + double end_angle = start_angle + M_PI / 2.0 / ((double) top_border_width / (double) border_width + 1); + + add_path_arc(cr, + left + radius_top_x, + top + radius_top_y, + radius_top_x - border_width, + radius_top_y - border_width + (border_width - top_border_width), + start_angle, + end_angle, false); + + add_path_arc(cr, + left + radius_top_x, + top + radius_top_y, + radius_top_x, + radius_top_y, + end_angle, + start_angle, true); + } else + { + cairo_move_to(cr, left + border_width, top + top_border_width); + cairo_line_to(cr, left, top); + } + + if(radius_bottom_x && radius_bottom_y) + { + cairo_line_to(cr, left, bottom - radius_bottom_y); + + double end_angle = M_PI; + double start_angle = end_angle - M_PI / 2.0 / ((double) bottom_border_width / (double) border_width + 1); + + add_path_arc(cr, + left + radius_bottom_x, + bottom - radius_bottom_y, + radius_bottom_x, + radius_bottom_y, + end_angle, + start_angle, true); + + add_path_arc(cr, + left + radius_bottom_x, + bottom - radius_bottom_y, + radius_bottom_x - border_width, + radius_bottom_y - border_width + (border_width - bottom_border_width), + start_angle, + end_angle, false); + } else + { + cairo_line_to(cr, left, bottom); + cairo_line_to(cr, left + border_width, bottom - bottom_border_width); + } + cairo_clip(cr); + + switch (style) + { + case litehtml::border_style_dotted: + draw_dotted(); + break; + case litehtml::border_style_dashed: + draw_dashed(); + break; + case litehtml::border_style_double: + draw_double(); + break; + case litehtml::border_style_inset: + draw_inset_outset(true); + break; + case litehtml::border_style_outset: + draw_inset_outset(false); + break; + case litehtml::border_style_groove: + draw_groove_ridge(true); + break; + case litehtml::border_style_ridge: + draw_groove_ridge(false); + break; + default: + draw_solid(); + break; + } + + cairo_restore(cr); +} + +void cairo::border::draw_line(double line_offset, double top_line_offset, double bottom_line_offset) +{ + if(radius_top_x && radius_top_y) + { + double end_angle = M_PI; + double start_angle = end_angle + M_PI / 2.0 / ((double) top_border_width / (double) border_width + 1); + + add_path_arc(cr, + left + radius_top_x, + top + radius_top_y, + radius_top_x - line_offset, + radius_top_y - line_offset + (line_offset - top_line_offset), + start_angle, + end_angle, true); + } else + { + cairo_move_to(cr, left + line_offset, top); + } + + if(radius_bottom_x && radius_bottom_y) + { + cairo_line_to(cr, left + line_offset, bottom - radius_bottom_y); + + double start_angle = M_PI; + double end_angle = start_angle - M_PI / 2.0 / ((double) bottom_border_width / (double) border_width + 1); + + add_path_arc(cr, + left + radius_bottom_x, + bottom - radius_bottom_y, + radius_bottom_x - line_offset, + radius_bottom_y - line_offset + (line_offset - bottom_line_offset), + start_angle, + end_angle, true); + } else + { + cairo_line_to(cr, left + line_offset, bottom); + } +} + +void cairo::border::draw_inset_outset(bool is_inset) +{ + litehtml::web_color line_color; + litehtml::web_color light_color = color; + litehtml::web_color dark_color = color.darken(0.33); + if(color.red == 0 && color.green == 0 && color.blue == 0) + { + dark_color.red = dark_color.green = dark_color.blue = 0x4C; + light_color.red = light_color.green = light_color.blue = 0xB2; + } + + if (real_side == left_side || real_side == top_side) + { + line_color = is_inset ? dark_color : light_color; + } else + { + line_color = is_inset ? light_color : dark_color; + } + draw_line(border_width / 2.0, + top_border_width / 2.0, + bottom_border_width / 2.0); + cairo_set_line_cap(cr, CAIRO_LINE_CAP_BUTT); + cairo_set_dash(cr, nullptr, 0, 0); + set_color(cr, line_color); + cairo_set_line_width(cr, border_width); + cairo_stroke(cr); +} + +void cairo::border::draw_double() +{ + if (border_width < 3) + { + draw_solid(); + } else + { + cairo_set_line_cap(cr, CAIRO_LINE_CAP_BUTT); + cairo_set_dash(cr, nullptr, 0, 0); + set_color(cr, color); + + double line_width = border_width / 3.0; + cairo_set_line_width(cr, line_width); + // draw external line + draw_line(line_width / 2.0, + top_border_width / 6.0, + bottom_border_width / 6.0); + cairo_stroke(cr); + // draw internal line + draw_line(border_width - line_width / 2.0, + top_border_width - top_border_width / 6.0, + bottom_border_width - bottom_border_width / 6.0); + cairo_stroke(cr); + } +} + +void cairo::border::draw_dashed() +{ + draw_line(border_width / 2.0, + top_border_width / 2.0, + bottom_border_width / 2.0); + + int line_length = std::abs(bottom - top); + int segment_length = border_width * 3; + int seg_nums = line_length / segment_length; + if(seg_nums < 2) + { + seg_nums = 2; + } if(seg_nums % 2 != 0) + { + seg_nums = seg_nums + 1; + } + seg_nums++; + double seg_len = (double) line_length / (double) seg_nums; + + double dashes[2]; + dashes[0] = seg_len; + dashes[1] = seg_len; + cairo_set_line_cap(cr, CAIRO_LINE_CAP_BUTT); + cairo_set_dash(cr, dashes, 2, 0); + set_color(cr, color); + cairo_set_line_width(cr, border_width); + cairo_stroke(cr); +} + +void cairo::border::draw_solid() +{ + draw_line(border_width / 2.0, + top_border_width / 2.0, + bottom_border_width / 2.0); + cairo_set_line_cap(cr, CAIRO_LINE_CAP_BUTT); + cairo_set_dash(cr, nullptr, 0, 0); + set_color(cr, color); + cairo_set_line_width(cr, border_width); + cairo_stroke(cr); +} + +void cairo::border::draw_dotted() +{ + draw_line(border_width / 2.0, + top_border_width / 2.0, + bottom_border_width / 2.0); + + double line_length = std::abs(bottom - top); + + double dot_size = border_width; + int num_dots = (int) std::nearbyint(line_length / (dot_size * 2.0)); + if(num_dots < 2) + { + num_dots = 2; + } if(num_dots % 2 != 0) + { + num_dots = num_dots + 1; + } + num_dots++; + double space_len = ((double) line_length - (double) border_width) / (num_dots - 1.0); + + double dashes[2]; + dashes[0] = 0; + dashes[1] = space_len; + cairo_set_line_cap(cr, CAIRO_LINE_CAP_ROUND); + cairo_set_dash(cr, dashes, 2, -dot_size / 2.0); + + set_color(cr, color); + cairo_set_line_width(cr, border_width); + cairo_stroke(cr); +} + +void cairo::border::draw_groove_ridge(bool is_groove) +{ + if(border_width == 1) + { + draw_solid(); + } else + { + litehtml::web_color inner_line_color; + litehtml::web_color outer_line_color; + litehtml::web_color light_color = color; + litehtml::web_color dark_color = color.darken(0.33); + if (color.red == 0 && color.green == 0 && color.blue == 0) + { + dark_color.red = dark_color.green = dark_color.blue = 0x4C; + light_color.red = light_color.green = light_color.blue = 0xB2; + } + + if (real_side == left_side || real_side == top_side) + { + outer_line_color = is_groove ? dark_color : light_color; + inner_line_color = is_groove ? light_color : dark_color; + } else + { + outer_line_color = is_groove ? light_color : dark_color; + inner_line_color = is_groove ? dark_color : light_color; + } + + cairo_set_line_cap(cr, CAIRO_LINE_CAP_BUTT); + cairo_set_dash(cr, nullptr, 0, 0); + + double line_width = border_width / 2.0; + cairo_set_line_width(cr, line_width); + // draw external line + draw_line(line_width / 2.0, + top_border_width / 4.0, + bottom_border_width / 4.0); + set_color(cr, outer_line_color); + cairo_stroke(cr); + // draw internal line + set_color(cr, inner_line_color); + draw_line(border_width - line_width / 2.0, + top_border_width - top_border_width / 4.0, + bottom_border_width - bottom_border_width / 4.0); + cairo_stroke(cr); + } +} diff --git a/libs/litehtml/containers/cairo/cairo_borders.h b/libs/litehtml/containers/cairo/cairo_borders.h new file mode 100644 index 0000000000..1bf18d6056 --- /dev/null +++ b/libs/litehtml/containers/cairo/cairo_borders.h @@ -0,0 +1,69 @@ +#ifndef LITEHTML_CAIRO_BORDERS_H +#define LITEHTML_CAIRO_BORDERS_H + +#include + +namespace cairo +{ + extern void add_path_arc(cairo_t* cr, double x, double y, double rx, double ry, double a1, double a2, bool neg); + inline void set_color(cairo_t* cr, const litehtml::web_color& color) + { + cairo_set_source_rgba(cr, color.red / 255.0, color.green / 255.0, color.blue / 255.0, color.alpha / 255.0); + } + + class border + { + public: + enum real_side_t + { + left_side, + top_side, + right_side, + bottom_side + }; + + real_side_t real_side; /// real side of the border + litehtml::web_color color; + litehtml::border_style style; + + int border_width; + int top_border_width; + int bottom_border_width; + + int radius_top_x; + int radius_top_y; + int radius_bottom_x; + int radius_bottom_y; + + border(cairo_t* _cr, int _left, int _top, int _bottom) : + real_side(left_side), + color(), + style(litehtml::border_style_none), + border_width(0), + top_border_width(0), + bottom_border_width(0), + radius_top_x(0), + radius_top_y(0), + radius_bottom_x(0), + radius_bottom_y(0), + cr(_cr), left(_left), top(_top), bottom(_bottom) + {} + + void draw_border(); + + private: + cairo_t* cr; + int left; + int top; + int bottom; + void draw_line(double line_offset, double top_line_offset, double bottom_line_offset); + void draw_solid(); + void draw_dotted(); + void draw_dashed(); + void draw_double(); + void draw_inset_outset(bool is_inset); + void draw_groove_ridge(bool is_groove); + }; +} + +#endif //LITEHTML_CAIRO_BORDERS_H diff --git a/libs/litehtml/containers/cairo/cairo_images_cache.h b/libs/litehtml/containers/cairo/cairo_images_cache.h new file mode 100644 index 0000000000..4260fae2be --- /dev/null +++ b/libs/litehtml/containers/cairo/cairo_images_cache.h @@ -0,0 +1,91 @@ +#ifndef LITEHTML_CAIRO_IMAGES_CACHE_H +#define LITEHTML_CAIRO_IMAGES_CACHE_H + +#include +#include +#include +#include + +class cairo_surface_wrapper +{ + cairo_surface_t* surface; +public: + cairo_surface_wrapper() : surface(nullptr) {} + cairo_surface_wrapper(cairo_surface_wrapper& v) : surface(v.surface) + { + if(v.surface) + { + surface = cairo_surface_reference(v.surface); + } + } + explicit cairo_surface_wrapper(cairo_surface_t* v) : surface(v) {} + cairo_surface_wrapper(cairo_surface_wrapper&& v) noexcept + { + surface = v.surface; + v.surface = nullptr; + } + cairo_surface_wrapper& operator=(const cairo_surface_wrapper& v) + { + if(surface != v.surface) + { + if(surface) + { + cairo_surface_destroy(surface); + } + surface = cairo_surface_reference(v.surface); + } + return *this; + } + ~cairo_surface_wrapper() + { + if(surface) + { + cairo_surface_destroy(surface); + } + } + cairo_surface_t* get() { return cairo_surface_reference(surface); } +}; + +class cairo_images_cache +{ + std::mutex m_mutex; + std::map m_images; +public: + void add_image(const std::string& url, cairo_surface_t* image) + { + std::unique_lock lock(m_mutex); + m_images[url] = cairo_surface_wrapper(image); + } + + cairo_surface_t* get_image(const std::string& url) + { + std::unique_lock lock(m_mutex); + auto iter = m_images.find(url); + if(iter != m_images.end()) + { + return iter->second.get(); + } + return nullptr; + } + + bool reserve(const std::string& url) + { + std::unique_lock lock(m_mutex); + auto iter = m_images.find(url); + if (iter == m_images.end()) + { + m_images[url] = cairo_surface_wrapper(); + return true; + } + return false; + } + + bool exists(const std::string& url) + { + std::unique_lock lock(m_mutex); + auto iter = m_images.find(url); + return iter != m_images.end(); + } +}; + +#endif //LITEHTML_CAIRO_IMAGES_CACHE_H diff --git a/libs/litehtml/containers/cairo/container_cairo.cpp b/libs/litehtml/containers/cairo/container_cairo.cpp new file mode 100644 index 0000000000..1c66c48279 --- /dev/null +++ b/libs/litehtml/containers/cairo/container_cairo.cpp @@ -0,0 +1,539 @@ +#include "container_cairo.h" +#include "cairo_borders.h" +#include + +#ifndef M_PI +# define M_PI 3.14159265358979323846 +#endif + + +int container_cairo::pt_to_px(int pt ) const +{ + double dpi = get_screen_dpi(); + + return (int) ((double) pt * dpi / 72.0); +} + +int container_cairo::get_default_font_size() const +{ + return pt_to_px(12); +} + +void container_cairo::draw_list_marker(litehtml::uint_ptr hdc, const litehtml::list_marker& marker ) +{ + if(!marker.image.empty()) + { + /*litehtml::string url; + make_url(marker.image.c_str(), marker.baseurl, url); + + lock_images_cache(); + images_map::iterator img_i = m_images.find(url.c_str()); + if(img_i != m_images.end()) + { + if(img_i->second) + { + draw_txdib((cairo_t*) hdc, img_i->second, marker.pos.x, marker.pos.y, marker.pos.width, marker.pos.height); + } + } + unlock_images_cache();*/ + } else + { + switch(marker.marker_type) + { + case litehtml::list_style_type_circle: + { + draw_ellipse((cairo_t*) hdc, marker.pos.x, marker.pos.y, marker.pos.width, marker.pos.height, marker.color, 1); + } + break; + case litehtml::list_style_type_disc: + { + fill_ellipse((cairo_t*) hdc, marker.pos.x, marker.pos.y, marker.pos.width, marker.pos.height, marker.color); + } + break; + case litehtml::list_style_type_square: + if(hdc) + { + auto* cr = (cairo_t*) hdc; + cairo_save(cr); + + cairo_new_path(cr); + cairo_rectangle(cr, marker.pos.x, marker.pos.y, marker.pos.width, marker.pos.height); + + set_color(cr, marker.color); + cairo_fill(cr); + cairo_restore(cr); + } + break; + default: + /*do nothing*/ + break; + } + } +} + +void container_cairo::get_image_size(const char* src, const char* baseurl, litehtml::size& sz ) +{ + litehtml::string url; + make_url(src, baseurl, url); + + auto img = get_image(url); + if(img) + { + sz.width = cairo_image_surface_get_width(img); + sz.height = cairo_image_surface_get_height(img); + cairo_surface_destroy(img); + } else + { + sz.width = 0; + sz.height = 0; + } +} + +void container_cairo::draw_background(litehtml::uint_ptr hdc, const std::vector& bgvec ) +{ + auto* cr = (cairo_t*) hdc; + cairo_save(cr); + apply_clip(cr); + + const auto& bg = bgvec.back(); + + rounded_rectangle(cr, bg.border_box, bg.border_radius); + cairo_clip(cr); + + cairo_rectangle(cr, bg.clip_box.x, bg.clip_box.y, bg.clip_box.width, bg.clip_box.height); + cairo_clip(cr); + + if(bg.color.alpha) + { + set_color(cr, bg.color); + cairo_paint(cr); + } + + for (int i = (int)bgvec.size() - 1; i >= 0; i--) + { + const auto& bg = bgvec[i]; + + if(bg.image_size.height == 0 || bg.image_size.width == 0) continue; + + cairo_rectangle(cr, bg.clip_box.x, bg.clip_box.y, bg.clip_box.width, bg.clip_box.height); + cairo_clip(cr); + + std::string url; + make_url(bg.image.c_str(), bg.baseurl.c_str(), url); + + auto bgbmp = get_image(url); + if(bgbmp) + { + if(bg.image_size.width != cairo_image_surface_get_width(bgbmp) || bg.image_size.height != cairo_image_surface_get_height(bgbmp)) + { + auto new_img = scale_surface(bgbmp, bg.image_size.width, bg.image_size.height); + cairo_surface_destroy(bgbmp); + bgbmp = new_img; + } + + cairo_pattern_t *pattern = cairo_pattern_create_for_surface(bgbmp); + cairo_matrix_t flib_m; + cairo_matrix_init_identity(&flib_m); + cairo_matrix_translate(&flib_m, -bg.position_x, -bg.position_y); + cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REPEAT); + cairo_pattern_set_matrix (pattern, &flib_m); + + switch(bg.repeat) + { + case litehtml::background_repeat_no_repeat: + draw_pixbuf(cr, bgbmp, bg.position_x, bg.position_y, cairo_image_surface_get_width(bgbmp), cairo_image_surface_get_height(bgbmp)); + break; + + case litehtml::background_repeat_repeat_x: + cairo_set_source(cr, pattern); + cairo_rectangle(cr, bg.clip_box.left(), bg.position_y, bg.clip_box.width, cairo_image_surface_get_height(bgbmp)); + cairo_fill(cr); + break; + + case litehtml::background_repeat_repeat_y: + cairo_set_source(cr, pattern); + cairo_rectangle(cr, bg.position_x, bg.clip_box.top(), cairo_image_surface_get_width(bgbmp), bg.clip_box.height); + cairo_fill(cr); + break; + + case litehtml::background_repeat_repeat: + cairo_set_source(cr, pattern); + cairo_rectangle(cr, bg.clip_box.left(), bg.clip_box.top(), bg.clip_box.width, bg.clip_box.height); + cairo_fill(cr); + break; + } + + cairo_pattern_destroy(pattern); + cairo_surface_destroy(bgbmp); + } + } + + cairo_restore(cr); +} + +void container_cairo::make_url(const char* url, const char* /*basepath*/, litehtml::string& out) +{ + out = url; +} + +void container_cairo::add_path_arc(cairo_t* cr, double x, double y, double rx, double ry, double a1, double a2, bool neg) +{ + if(rx > 0 && ry > 0) + { + + cairo_save(cr); + + cairo_translate(cr, x, y); + cairo_scale(cr, 1, ry / rx); + cairo_translate(cr, -x, -y); + + if(neg) + { + cairo_arc_negative(cr, x, y, rx, a1, a2); + } else + { + cairo_arc(cr, x, y, rx, a1, a2); + } + + cairo_restore(cr); + } else + { + cairo_move_to(cr, x, y); + } +} + +void container_cairo::draw_borders(litehtml::uint_ptr hdc, const litehtml::borders& borders, const litehtml::position& draw_pos, bool /*root*/) +{ + auto* cr = (cairo_t*) hdc; + cairo_save(cr); + apply_clip(cr); + + cairo_new_path(cr); + + int bdr_top = 0; + int bdr_bottom = 0; + int bdr_left = 0; + int bdr_right = 0; + + if(borders.top.width != 0 && borders.top.style > litehtml::border_style_hidden) + { + bdr_top = (int) borders.top.width; + } + if(borders.bottom.width != 0 && borders.bottom.style > litehtml::border_style_hidden) + { + bdr_bottom = (int) borders.bottom.width; + } + if(borders.left.width != 0 && borders.left.style > litehtml::border_style_hidden) + { + bdr_left = (int) borders.left.width; + } + if(borders.right.width != 0 && borders.right.style > litehtml::border_style_hidden) + { + bdr_right = (int) borders.right.width; + } + + // draw right border + if(bdr_right) + { + cairo_matrix_t save_matrix; + cairo_get_matrix(cr, &save_matrix); + cairo_translate(cr, draw_pos.left(), draw_pos.top()); + cairo_rotate(cr, M_PI); + cairo_translate(cr, -draw_pos.left(), -draw_pos.top()); + + cairo::border border(cr, draw_pos.left() - draw_pos.width, draw_pos.top() - draw_pos.height, draw_pos.top()); + border.real_side = cairo::border::right_side; + border.color = borders.right.color; + border.style = borders.right.style; + border.border_width = bdr_right; + border.top_border_width = bdr_bottom; + border.bottom_border_width = bdr_top; + border.radius_top_x = borders.radius.bottom_right_x; + border.radius_top_y = borders.radius.bottom_right_y; + border.radius_bottom_x = borders.radius.top_right_x; + border.radius_bottom_y = borders.radius.top_right_y; + border.draw_border(); + + cairo_set_matrix(cr, &save_matrix); + } + + // draw bottom border + if(bdr_bottom) + { + cairo_matrix_t save_matrix; + cairo_get_matrix(cr, &save_matrix); + cairo_translate(cr, draw_pos.left(), draw_pos.top()); + cairo_rotate(cr, - M_PI / 2.0); + cairo_translate(cr, -draw_pos.left(), -draw_pos.top()); + + cairo::border border(cr, draw_pos.left() - draw_pos.height, draw_pos.top(), draw_pos.top() + draw_pos.width); + border.real_side = cairo::border::bottom_side; + border.color = borders.bottom.color; + border.style = borders.bottom.style; + border.border_width = bdr_bottom; + border.top_border_width = bdr_left; + border.bottom_border_width = bdr_right; + border.radius_top_x = borders.radius.bottom_left_x; + border.radius_top_y = borders.radius.bottom_left_y; + border.radius_bottom_x = borders.radius.bottom_right_x; + border.radius_bottom_y = borders.radius.bottom_right_y; + border.draw_border(); + + cairo_set_matrix(cr, &save_matrix); + } + + // draw top border + if(bdr_top) + { + cairo_matrix_t save_matrix; + cairo_get_matrix(cr, &save_matrix); + cairo_translate(cr, draw_pos.left(), draw_pos.top()); + cairo_rotate(cr, M_PI / 2.0); + cairo_translate(cr, -draw_pos.left(), -draw_pos.top()); + + cairo::border border(cr, draw_pos.left(), draw_pos.top() - draw_pos.width, draw_pos.top()); + border.real_side = cairo::border::top_side; + border.color = borders.top.color; + border.style = borders.top.style; + border.border_width = bdr_top; + border.top_border_width = bdr_right; + border.bottom_border_width = bdr_left; + border.radius_top_x = borders.radius.top_right_x; + border.radius_top_y = borders.radius.top_right_y; + border.radius_bottom_x = borders.radius.top_left_x; + border.radius_bottom_y = borders.radius.top_left_y; + border.draw_border(); + + cairo_set_matrix(cr, &save_matrix); + } + + // draw left border + if(bdr_left) + { + cairo::border border(cr, draw_pos.left(), draw_pos.top(), draw_pos.bottom()); + border.real_side = cairo::border::left_side; + border.color = borders.left.color; + border.style = borders.left.style; + border.border_width = bdr_left; + border.top_border_width = bdr_top; + border.bottom_border_width = bdr_bottom; + border.radius_top_x = borders.radius.top_left_x; + border.radius_top_y = borders.radius.top_left_y; + border.radius_bottom_x = borders.radius.bottom_left_x; + border.radius_bottom_y = borders.radius.bottom_left_y; + border.draw_border(); + } + cairo_restore(cr); +} + +void container_cairo::transform_text(litehtml::string& /*text*/, litehtml::text_transform /*tt*/) +{ + +} + +void container_cairo::set_clip(const litehtml::position& pos, const litehtml::border_radiuses& bdr_radius ) +{ + m_clips.emplace_back(pos, bdr_radius); +} + +void container_cairo::del_clip() +{ + if(!m_clips.empty()) + { + m_clips.pop_back(); + } +} + +void container_cairo::apply_clip(cairo_t* cr ) +{ + for(const auto& clip_box : m_clips) + { + rounded_rectangle(cr, clip_box.box, clip_box.radius); + cairo_clip(cr); + } +} + +void container_cairo::draw_ellipse(cairo_t* cr, int x, int y, int width, int height, const litehtml::web_color& color, int line_width ) +{ + if(!cr || !width || !height) return; + cairo_save(cr); + + apply_clip(cr); + + cairo_new_path(cr); + + cairo_translate (cr, x + width / 2.0, y + height / 2.0); + cairo_scale (cr, width / 2.0, height / 2.0); + cairo_arc (cr, 0, 0, 1, 0, 2 * M_PI); + + set_color(cr, color); + cairo_set_line_width(cr, line_width); + cairo_stroke(cr); + + cairo_restore(cr); +} + +void container_cairo::fill_ellipse(cairo_t* cr, int x, int y, int width, int height, const litehtml::web_color& color ) +{ + if(!cr || !width || !height) return; + cairo_save(cr); + + apply_clip(cr); + + cairo_new_path(cr); + + cairo_translate (cr, x + width / 2.0, y + height / 2.0); + cairo_scale (cr, width / 2.0, height / 2.0); + cairo_arc (cr, 0, 0, 1, 0, 2 * M_PI); + + set_color(cr, color); + cairo_fill(cr); + + cairo_restore(cr); +} + +void container_cairo::clear_images() +{ +/* for(images_map::iterator i = m_images.begin(); i != m_images.end(); i++) + { + if(i->second) + { + delete i->second; + } + } + m_images.clear(); +*/ +} + +const char* container_cairo::get_default_font_name() const +{ + return "Times New Roman"; +} + +std::shared_ptr container_cairo::create_element(const char */*tag_name*/, + const litehtml::string_map &/*attributes*/, + const std::shared_ptr &/*doc*/) +{ + return nullptr; +} + +void container_cairo::rounded_rectangle(cairo_t* cr, const litehtml::position &pos, const litehtml::border_radiuses &radius ) +{ + cairo_new_path(cr); + if(radius.top_left_x && radius.top_left_y) + { + add_path_arc(cr, + pos.left() + radius.top_left_x, + pos.top() + radius.top_left_y, + radius.top_left_x, + radius.top_left_y, + M_PI, + M_PI * 3.0 / 2.0, false); + } else + { + cairo_move_to(cr, pos.left(), pos.top()); + } + + cairo_line_to(cr, pos.right() - radius.top_right_x, pos.top()); + + if(radius.top_right_x && radius.top_right_y) + { + add_path_arc(cr, + pos.right() - radius.top_right_x, + pos.top() + radius.top_right_y, + radius.top_right_x, + radius.top_right_y, + M_PI * 3.0 / 2.0, + 2.0 * M_PI, false); + } + + cairo_line_to(cr, pos.right(), pos.bottom() - radius.bottom_right_x); + + if(radius.bottom_right_x && radius.bottom_right_y) + { + add_path_arc(cr, + pos.right() - radius.bottom_right_x, + pos.bottom() - radius.bottom_right_y, + radius.bottom_right_x, + radius.bottom_right_y, + 0, + M_PI / 2.0, false); + } + + cairo_line_to(cr, pos.left() - radius.bottom_left_x, pos.bottom()); + + if(radius.bottom_left_x && radius.bottom_left_y) + { + add_path_arc(cr, + pos.left() + radius.bottom_left_x, + pos.bottom() - radius.bottom_left_y, + radius.bottom_left_x, + radius.bottom_left_y, + M_PI / 2.0, + M_PI, false); + } +} + +cairo_surface_t* container_cairo::scale_surface(cairo_surface_t* surface, int width, int height) +{ + int s_width = cairo_image_surface_get_width(surface); + int s_height = cairo_image_surface_get_height(surface); + cairo_surface_t *result = cairo_surface_create_similar(surface, cairo_surface_get_content(surface), width, height); + cairo_t *cr = cairo_create(result); + cairo_scale(cr, (double) width / (double) s_width, (double) height / (double) s_height); + cairo_set_source_surface(cr, surface, 0, 0); + cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE); + cairo_paint(cr); + cairo_destroy(cr); + return result; +} + +void container_cairo::draw_pixbuf(cairo_t* cr, cairo_surface_t* bmp, int x, int y, int cx, int cy) +{ + cairo_save(cr); + + { + cairo_matrix_t flip_m; + cairo_matrix_init(&flip_m, 1, 0, 0, -1, 0, 0); + + if(cx != cairo_image_surface_get_width(bmp) || cy != cairo_image_surface_get_height(bmp)) + { + auto bmp_scaled = scale_surface(bmp, cx, cy); + cairo_set_source_surface(cr, bmp_scaled, x, y); + cairo_paint(cr); + cairo_surface_destroy(bmp_scaled); + } else + { + cairo_set_source_surface(cr, bmp, x, y); + cairo_paint(cr); + } + } + + cairo_restore(cr); +} + +void container_cairo::get_media_features(litehtml::media_features& media) const +{ + litehtml::position client; + get_client_rect(client); + media.type = litehtml::media_type_screen; + media.width = client.width; + media.height = client.height; + media.device_width = get_screen_width(); + media.device_height = get_screen_height(); + media.color = 8; + media.monochrome = 0; + media.color_index = 256; + media.resolution = 96; +} + +void container_cairo::get_language(litehtml::string& language, litehtml::string& culture) const +{ + language = "en"; + culture = ""; +} + +void container_cairo::link(const std::shared_ptr &/*ptr*/, const litehtml::element::ptr& /*el*/) +{ + +} diff --git a/libs/litehtml/containers/cairo/container_cairo.h b/libs/litehtml/containers/cairo/container_cairo.h new file mode 100644 index 0000000000..f5881a05db --- /dev/null +++ b/libs/litehtml/containers/cairo/container_cairo.h @@ -0,0 +1,88 @@ +#ifndef LH_CONTAINER_LINUX_H +#define LH_CONTAINER_LINUX_H + +#include "../../include/litehtml.h" +#include + +struct cairo_clip_box +{ + typedef std::vector vector; + litehtml::position box; + litehtml::border_radiuses radius; + + cairo_clip_box(const litehtml::position& vBox, const litehtml::border_radiuses& vRad) + { + box = vBox; + radius = vRad; + } + + cairo_clip_box(const cairo_clip_box& val) + { + box = val.box; + radius = val.radius; + } + cairo_clip_box& operator=(const cairo_clip_box& val) + { + box = val.box; + radius = val.radius; + return *this; + } +}; + +class container_cairo : public litehtml::document_container +{ +protected: + cairo_clip_box::vector m_clips; +public: + container_cairo() = default; + virtual ~container_cairo() = default; + + int pt_to_px(int pt) const override; + int get_default_font_size() const override; + const char* get_default_font_name() const override; + void get_image_size(const char* src, const char* baseurl, litehtml::size& sz) override; + void draw_background(litehtml::uint_ptr hdc, const std::vector& bg) override; + void draw_borders(litehtml::uint_ptr hdc, const litehtml::borders& borders, const litehtml::position& draw_pos, bool root) override; + void draw_list_marker(litehtml::uint_ptr hdc, const litehtml::list_marker& marker) override; + std::shared_ptr create_element(const char *tag_name, + const litehtml::string_map &attributes, + const std::shared_ptr &doc) override; + void get_media_features(litehtml::media_features& media) const override; + void get_language(litehtml::string& language, litehtml::string & culture) const override; + void link(const std::shared_ptr &ptr, const litehtml::element::ptr& el) override; + + + void transform_text(litehtml::string& text, litehtml::text_transform tt) override; + void set_clip(const litehtml::position& pos, const litehtml::border_radiuses& bdr_radius) override; + void del_clip() override; + + virtual void make_url( const char* url, const char* basepath, litehtml::string& out ); + virtual cairo_surface_t* get_image(const std::string& url) = 0; + virtual double get_screen_dpi() const = 0; + virtual int get_screen_width() const = 0; + virtual int get_screen_height() const = 0; + + void clear_images(); + +protected: + virtual void draw_ellipse(cairo_t* cr, int x, int y, int width, int height, const litehtml::web_color& color, int line_width); + virtual void fill_ellipse(cairo_t* cr, int x, int y, int width, int height, const litehtml::web_color& color); + virtual void rounded_rectangle( cairo_t* cr, const litehtml::position &pos, const litehtml::border_radiuses &radius ); + + void apply_clip(cairo_t* cr); + static void set_color(cairo_t* cr, const litehtml::web_color& color) + { + cairo_set_source_rgba(cr, + color.red / 255.0, + color.green / 255.0, + color.blue / 255.0, + color.alpha / 255.0); + } +private: + + static void add_path_arc(cairo_t* cr, double x, double y, double rx, double ry, double a1, double a2, bool neg); + static void draw_pixbuf(cairo_t* cr, cairo_surface_t* bmp, int x, int y, int cx, int cy); + static cairo_surface_t* scale_surface(cairo_surface_t* surface, int width, int height); +}; + +#endif diff --git a/libs/litehtml/containers/cairo/container_cairo_pango.cpp b/libs/litehtml/containers/cairo/container_cairo_pango.cpp new file mode 100644 index 0000000000..e218d7fd45 --- /dev/null +++ b/libs/litehtml/containers/cairo/container_cairo_pango.cpp @@ -0,0 +1,180 @@ +#include "container_cairo_pango.h" + +container_cairo_pango::container_cairo_pango() +{ + m_temp_surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 2, 2); + m_temp_cr = cairo_create(m_temp_surface); +} + +container_cairo_pango::~container_cairo_pango() +{ + clear_images(); + cairo_surface_destroy(m_temp_surface); + cairo_destroy(m_temp_cr); +} + +litehtml::uint_ptr container_cairo_pango::create_font(const char *faceName, int size, int weight, litehtml::font_style italic, + unsigned int decoration, litehtml::font_metrics *fm) +{ + PangoFontDescription *desc = pango_font_description_from_string (faceName); + pango_font_description_set_absolute_size(desc, size * PANGO_SCALE); + if(italic == litehtml::font_style_italic) + { + pango_font_description_set_style(desc, PANGO_STYLE_ITALIC); + } else + { + pango_font_description_set_style(desc, PANGO_STYLE_NORMAL); + } + PangoWeight fnt_weight; + if(weight >= 0 && weight < 150) fnt_weight = PANGO_WEIGHT_THIN; + else if(weight >= 150 && weight < 250) fnt_weight = PANGO_WEIGHT_ULTRALIGHT; + else if(weight >= 250 && weight < 350) fnt_weight = PANGO_WEIGHT_LIGHT; + else if(weight >= 350 && weight < 450) fnt_weight = PANGO_WEIGHT_NORMAL; + else if(weight >= 450 && weight < 550) fnt_weight = PANGO_WEIGHT_MEDIUM; + else if(weight >= 550 && weight < 650) fnt_weight = PANGO_WEIGHT_SEMIBOLD; + else if(weight >= 650 && weight < 750) fnt_weight = PANGO_WEIGHT_BOLD; + else if(weight >= 750 && weight < 850) fnt_weight = PANGO_WEIGHT_ULTRABOLD; + else fnt_weight = PANGO_WEIGHT_HEAVY; + + pango_font_description_set_weight(desc, fnt_weight); + + cairo_font* ret = nullptr; + + if(fm) + { + cairo_save(m_temp_cr); + PangoLayout *layout = pango_cairo_create_layout(m_temp_cr); + PangoContext *context = pango_layout_get_context(layout); + PangoLanguage *language = pango_language_get_default(); + pango_layout_set_font_description(layout, desc); + PangoFontMetrics *metrics = pango_context_get_metrics(context, desc, language); + + fm->ascent = PANGO_PIXELS((double)pango_font_metrics_get_ascent(metrics)); + fm->descent = PANGO_PIXELS((double)pango_font_metrics_get_descent(metrics)); + fm->height = fm->ascent + fm->descent; + fm->x_height = fm->height; + + pango_layout_set_text(layout, "x", 1); + + int x_width, x_height; + pango_layout_get_pixel_size(layout, &x_width, &x_height); + + fm->x_height = x_height; + + cairo_restore(m_temp_cr); + + g_object_unref(layout); + pango_font_metrics_unref(metrics); + + ret = new cairo_font; + ret->font = desc; + ret->size = size; + ret->strikeout = (decoration & litehtml::font_decoration_linethrough) != 0; + ret->underline = (decoration & litehtml::font_decoration_underline) != 0; + ret->ascent = fm->ascent; + ret->descent = fm->descent; + + ret->underline_thickness = pango_font_metrics_get_underline_thickness(metrics); + ret->underline_position = -pango_font_metrics_get_underline_position(metrics); + pango_quantize_line_geometry(&ret->underline_thickness, &ret->underline_position); + ret->underline_thickness = PANGO_PIXELS(ret->underline_thickness); + ret->underline_position = -1;//PANGO_PIXELS(ret->underline_position); + + ret->strikethrough_thickness = pango_font_metrics_get_strikethrough_thickness(metrics); + ret->strikethrough_position = pango_font_metrics_get_strikethrough_position(metrics); + pango_quantize_line_geometry(&ret->strikethrough_thickness, &ret->strikethrough_position); + ret->strikethrough_thickness = PANGO_PIXELS(ret->strikethrough_thickness); + ret->strikethrough_position = PANGO_PIXELS(ret->strikethrough_position); + } + + return (litehtml::uint_ptr) ret; +} + +void container_cairo_pango::delete_font(litehtml::uint_ptr hFont) +{ + auto* fnt = (cairo_font*) hFont; + if(fnt) + { + pango_font_description_free(fnt->font); + delete fnt; + } +} + +int container_cairo_pango::text_width(const char *text, litehtml::uint_ptr hFont) +{ + auto* fnt = (cairo_font*) hFont; + + cairo_save(m_temp_cr); + + PangoLayout *layout = pango_cairo_create_layout(m_temp_cr); + pango_layout_set_font_description(layout, fnt->font); + + pango_layout_set_text(layout, text, -1); + pango_cairo_update_layout (m_temp_cr, layout); + + int x_width, x_height; + pango_layout_get_pixel_size(layout, &x_width, &x_height); + + cairo_restore(m_temp_cr); + + g_object_unref(layout); + + return (int) x_width; +} + +void container_cairo_pango::draw_text(litehtml::uint_ptr hdc, const char *text, litehtml::uint_ptr hFont, + litehtml::web_color color, const litehtml::position &pos) +{ + auto* fnt = (cairo_font*) hFont; + auto* cr = (cairo_t*) hdc; + cairo_save(cr); + + apply_clip(cr); + + set_color(cr, color); + + PangoLayout *layout = pango_cairo_create_layout(cr); + pango_layout_set_font_description (layout, fnt->font); + pango_layout_set_text (layout, text, -1); + + int baseline = PANGO_PIXELS(pango_layout_get_baseline(layout)); + + PangoRectangle ink_rect, logical_rect; + pango_layout_get_pixel_extents(layout, &ink_rect, &logical_rect); + + int text_baseline = pos.height - fnt->descent; + + int x = pos.left() + logical_rect.x; + int y = pos.top() + logical_rect.y + text_baseline - baseline; + + cairo_move_to(cr, x, y); + pango_cairo_update_layout (cr, layout); + pango_cairo_show_layout (cr, layout); + + int tw = 0; + + if(fnt->underline || fnt->strikeout) + { + tw = text_width(text, hFont); + } + + if(fnt->underline) + { + cairo_set_line_width(cr, fnt->underline_thickness); + cairo_move_to(cr, x, pos.top() + text_baseline - fnt->underline_position + 0.5); + cairo_line_to(cr, x + tw, pos.top() + text_baseline - fnt->underline_position + 0.5); + cairo_stroke(cr); + } + if(fnt->strikeout) + { + cairo_set_line_width(cr, fnt->strikethrough_thickness); + cairo_move_to(cr, x, pos.top() + text_baseline - fnt->strikethrough_position - 0.5); + cairo_line_to(cr, x + tw, pos.top() + text_baseline - fnt->strikethrough_position - 0.5); + cairo_stroke(cr); + } + + cairo_restore(cr); + + g_object_unref(layout); +} + diff --git a/libs/litehtml/containers/cairo/container_cairo_pango.h b/libs/litehtml/containers/cairo/container_cairo_pango.h new file mode 100644 index 0000000000..455bcf5cfb --- /dev/null +++ b/libs/litehtml/containers/cairo/container_cairo_pango.h @@ -0,0 +1,37 @@ +#ifndef LITEBROWSER_CONTAINER_CAIRO_PANGO_H +#define LITEBROWSER_CONTAINER_CAIRO_PANGO_H + +#include +#include "container_cairo.h" +#include +#include +#include + +struct cairo_font +{ + PangoFontDescription* font; + int size; + bool underline; + bool strikeout; + int ascent; + int descent; + int underline_thickness; + int underline_position; + int strikethrough_thickness; + int strikethrough_position; +}; + +class container_cairo_pango : public container_cairo +{ + cairo_surface_t* m_temp_surface; + cairo_t* m_temp_cr; +public: + container_cairo_pango(); + ~container_cairo_pango() override; + litehtml::uint_ptr create_font(const char* faceName, int size, int weight, litehtml::font_style italic, unsigned int decoration, litehtml::font_metrics* fm) override; + void delete_font(litehtml::uint_ptr hFont) override; + int text_width(const char* text, litehtml::uint_ptr hFont) override; + void draw_text(litehtml::uint_ptr hdc, const char* text, litehtml::uint_ptr hFont, litehtml::web_color color, const litehtml::position& pos) override; +}; + +#endif //LITEBROWSER_CONTAINER_CAIRO_PANGO_H diff --git a/libs/litehtml/containers/haiku/container_haiku.cpp b/libs/litehtml/containers/haiku/container_haiku.cpp new file mode 100644 index 0000000000..7c49f22b6f --- /dev/null +++ b/libs/litehtml/containers/haiku/container_haiku.cpp @@ -0,0 +1,568 @@ +/* + * Copyright 2019-2020 Haiku Inc. + * All rights reserved. Distributed under the terms of the BSD 3-clause license. + * Constributors + * 2019-2020 Adam Fowler + */ +#include "container_haiku.h" + +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include + +LiteHtmlView::LiteHtmlView(BRect frame, const char *name) + : BView(frame, name, B_FOLLOW_ALL, B_WILL_DRAW), + fContext(NULL), + m_html(NULL), + m_images(), + m_base_url(), + m_url() +{ + + BRect bounds(Bounds()); + BPoint topLeft = bounds.LeftTop(); + std::cout << "Initial bounds: topLeft x: " << +topLeft.x << ", y: " + << +topLeft.y << ", width: " << +bounds.Width() << ", height: " + << +bounds.Height() << std::endl; + + SetDrawingMode(B_OP_OVER); + SetFont(be_plain_font); + + //FillRect(bounds,B_SOLID_LOW); + + //SetLowColor(B_DOCUMENT_PANEL_COLOR); + //FillRect(rect); +} + +LiteHtmlView::~LiteHtmlView() +{ +} + +void +LiteHtmlView::SetContext(litehtml::context* ctx) +{ + fContext = ctx; +} + +void +LiteHtmlView::RenderFile(const char* localFilePath) +{ + std::cout << "RenderFile" << std::endl; + //BUrlRequest req; + // assume a local file for now, that is HTML + std::ifstream t(localFilePath); + std::string html((std::istreambuf_iterator(t)), + std::istreambuf_iterator()); + + //std::cout << "HTML output:-" << std::endl << html << std::endl; + + // Get parent folder for the base url + std::cout << "Loaded from file: " << localFilePath << std::endl; + BPath htmlPath(localFilePath); + BPath dirPath; + htmlPath.GetParent(&dirPath); + std::cout << "parent path: " << dirPath.Path() << std::endl; + set_base_url(dirPath.Path()); + //std::cout << " base url now:" << m_base_url << std::endl; + + RenderHTML(html); +} + +void +LiteHtmlView::RenderHTML(const std::string& htmlText) +{ + std::cout << "RenderHTML" << std::endl; + + // now use this string + m_html = litehtml::document::createFromString( + htmlText.c_str(), this, fContext); + if (m_html) + { + std::cout << "Successfully read html" << std::endl; + // success + // post-parse render operations, if required. + Invalidate(); + } else { + std::cout << "Failed to read html" << std::endl; + } + // always fire the rendering complete message + std::cout << "Sending html rendered message: " << M_HTML_RENDERED << std::endl; +} + +void +LiteHtmlView::Draw(BRect b) +{ + std::cout << "DRAW CALLED" << std::endl; + + BRect bounds(Bounds()); + FillRect(bounds,B_SOLID_LOW); + + // b only part of the window, but we need to draw the whole lot + + if (NULL != m_html) { + BPoint leftTop = bounds.LeftTop(); + litehtml::position clip(leftTop.x,leftTop.y, + bounds.Width(),bounds.Height()); + m_html->render(bounds.Width()); + m_html->draw((litehtml::uint_ptr) this,0,0,&clip); + } + SendNotices(M_HTML_RENDERED,new BMessage(M_HTML_RENDERED)); +} + +void +LiteHtmlView::GetPreferredSize(float* width,float* height) +{ + if (NULL == m_html) + { + BRect bounds(Bounds()); + *width = bounds.Width(); + *height = bounds.Height(); + } else { + *width = m_html->width(); + *height = m_html->height(); + } +} + +litehtml::uint_ptr +LiteHtmlView::create_font( const litehtml::tchar_t* faceName, int size, + int weight, litehtml::font_style italic, unsigned int decoration, + litehtml::font_metrics* fm ) +{ + //std::cout << "create_font" << std::endl; + litehtml::string_vector fonts; + litehtml::split_string(faceName, fonts, ","); + litehtml::trim(fonts[0]); + + uint16 face = B_REGULAR_FACE; // default + if (italic == litehtml::font_style_italic) + { + face |= B_ITALIC_FACE; + } + if (decoration & litehtml::font_decoration_underline) + { + face |= B_UNDERSCORE_FACE; + } + if (decoration & litehtml::font_decoration_linethrough) + { + face |= B_STRIKEOUT_FACE; + } + // Note: LIGHT, HEAVY, CONDENSED not supported in BeOS R5 +#ifdef __HAIKU__ + if(weight >= 0 && weight < 150) face |= B_LIGHT_FACE; + else if(weight >= 150 && weight < 250) face |= B_LIGHT_FACE; + else if(weight >= 250 && weight < 350) face |= B_LIGHT_FACE; + //else if(weight >= 350 && weight < 450) face |= B_REGULAR_FACE; + //else if(weight >= 450 && weight < 550) face |= B_REGULAR_FACE; + else if(weight >= 550 && weight < 650) face |= B_CONDENSED_FACE; +#else + else if(weight >= 550 && weight < 650) face |= B_BOLD_FACE; +#endif + else if(weight >= 650 && weight < 750) face |= B_BOLD_FACE; +#ifndef __HAIKU__ + else if(weight >= 750 && weight < 850) face |= B_BOLD_FACE; + else if(weight >= 950) face |= B_BOLD_FACE; +#else + else if(weight >= 750 && weight < 850) face |= B_HEAVY_FACE; + else if(weight >= 950) face |= B_HEAVY_FACE; +#endif + + BFont* tempFont = new BFont(); + bool found = false; + for(litehtml::string_vector::iterator i = fonts.begin(); + i != fonts.end(); i++) + { + if (B_OK == tempFont->SetFamilyAndFace(i->c_str(),face)) + { + found = true; + break; + } + } + + if (!found) + { + // default to the Be plain font + tempFont = new BFont(be_plain_font); + if (weight >= 550) + { + tempFont = new BFont(be_bold_font); + } + tempFont->SetFace(face); // chooses closest + } + + tempFont->SetSize(size); + + font_height hgt; + tempFont->GetHeight(&hgt); + fm->ascent = hgt.ascent; + fm->descent = hgt.descent; + fm->height = (int) (hgt.ascent + hgt.descent); + fm->x_height = (int) hgt.leading; + + return (litehtml::uint_ptr) tempFont; +} + +void +LiteHtmlView::delete_font( litehtml::uint_ptr hFont ) +{ + std::cout << "delete_font" << std::endl; +} + +int +LiteHtmlView::text_width( const litehtml::tchar_t* text, + litehtml::uint_ptr hFont ) +{ + //std::cout << "text_width" << std::endl; + BFont* fnt = (BFont*)hFont; + int width = fnt->StringWidth(text); + //std::cout << " Width: " << +width << std::endl; + return width; +} + +void +LiteHtmlView::draw_text( litehtml::uint_ptr hdc, const litehtml::tchar_t* text, + litehtml::uint_ptr hFont, litehtml::web_color color, + const litehtml::position& pos ) +{ + //std::cout << "draw_text" << std::endl; + if (!text) return; + if (0 == strlen(text)) return; + BFont* fnt = (BFont*)hFont; + + //std::cout << " left: " << +pos.left() << ", top: " << +pos.top() << std::endl; + //std::cout << " RGBA: " << +color.red << "," << +color.green << "," << +color.blue << "," << +color.alpha << std::endl; + //std::cout << " Font size: " << +fnt->Size() << std::endl; + //std::cout << " Text: " << text << std::endl; + BRect bounds(Bounds()); + + //FillRect(bounds,B_SOLID_LOW); + + BPoint leftTop = bounds.LeftTop(); + //std::cout << " Bounds left: " << +leftTop.x << ", top: " << +leftTop.y << ", Width: " << +bounds.Width() << ", Height: " << +bounds.Height() << std::endl; + + font_height fh; + fnt->GetHeight(&fh); + int baseline = fh.ascent + fh.descent;// + 10; + int leftbase = 0; //10; + MovePenTo(pos.left() + leftbase,pos.top() + baseline);//leftTop.x,leftTop.y); + SetFont(fnt); + //SetFont(be_plain_font); + rgb_color clr = ui_color(B_DOCUMENT_TEXT_COLOR); + /* + rgb_color clr; + clr.blue = 40; + clr.red = 40; + clr.green = 40; + */ + + clr.red = color.red; + clr.green = color.green; + clr.blue = color.blue; + clr.alpha = color.alpha; + + //std::cout << " Final RGBA: " << +clr.red << "," << +clr.green << "," << +clr.blue << "," << +clr.alpha << std::endl; + SetHighColor(clr); + SetLowColor(ui_color(B_DOCUMENT_BACKGROUND_COLOR)); + BString mystr(""); + //mystr << "text: "; + mystr << text; + DrawString(mystr); +} + +int +LiteHtmlView::pt_to_px( int pt ) +{ + std::cout << "pt_to_px" << std::endl; + return (int) ((double) pt * 1.3333333333); +} + +int +LiteHtmlView::get_default_font_size() const +{ + //std::cout << "get_default_font_size" << std::endl; + return 12; +} + +const litehtml::tchar_t* +LiteHtmlView::get_default_font_name() const +{ + //std::cout << "get_default_font_name" << std::endl; + font_family fam; + font_style style; + be_plain_font->GetFamilyAndStyle(&fam,&style); + char* cp = strdup(fam); + return (litehtml::tchar_t*)cp; +} + +void +LiteHtmlView::draw_list_marker( litehtml::uint_ptr hdc, + const litehtml::list_marker& marker ) +{ + std::cout << "draw_list_marker" << std::endl; + if (!marker.image.empty()) + { + std::cout << " image marker" << std::endl; + } +} + +void +LiteHtmlView::load_image( const litehtml::tchar_t* src, + const litehtml::tchar_t* baseurl, bool redraw_on_ready ) +{ + std::cout << "load_image" << std::endl; + + std::string url; + make_url(src, baseurl, url); + if(m_images.find(url.c_str()) == m_images.end()) + { + BEntry entry(url.c_str(), true); + if (entry.Exists()) { + std::cout << " Loading bitmap from file" << std::endl; + BBitmap* img = BTranslationUtils::GetBitmap(url.c_str()); + m_images[url] = img; + } + } +} + +void +LiteHtmlView::make_url(const litehtml::tchar_t* url, + const litehtml::tchar_t* basepath, litehtml::tstring& out) +{ + std::cout << "make_url" << std::endl; + std::cout << " url: " << url << std::endl; + if(!basepath || (basepath && !basepath[0])) + { + if(!m_base_url.empty()) + { + //out = urljoin(m_base_url, std::string(url)); + std::string ns(m_base_url); + ns += "/"; + ns += url; + out = ns; + } else + { + out = url; + } + } else + { + std::cout << " basepath: " << basepath << std::endl; + //out = urljoin(std::string(basepath), std::string(url)); + std::string ns(basepath); + ns += "/"; + ns += url; + out = ns; + } + std::cout << " Output url: " << out << std::endl; +} + +void +LiteHtmlView::set_base_url(const litehtml::tchar_t* base_url) +{ + std::cout << "set_base_url" << std::endl; +/* + if(base_url) + { + m_base_url = urljoin(m_url, std::string(base_url)); + } else + { + */ + m_base_url = base_url; + std::cout << " base url set to: " << m_base_url << std::endl; + //} +} + + +void +LiteHtmlView::get_image_size( const litehtml::tchar_t* src, + const litehtml::tchar_t* baseurl, litehtml::size& sz ) +{ + std::cout << "get_image_size" << std::endl; + std::string url; + make_url(src,NULL,url); + const auto& miter(m_images.find(url.c_str())); + if (m_images.end() != miter) + { + BBitmap* img = (BBitmap*)miter->second; + BRect size = img->Bounds(); + sz.width = size.Width(); + sz.height = size.Height(); + std::cout << " width: " << +sz.width << ", height: " << +sz.height << std::endl; + } +} + +void +LiteHtmlView::draw_image( litehtml::uint_ptr hdc, const litehtml::tchar_t* src, + const litehtml::tchar_t* baseurl, const litehtml::position& pos ) +{ + std::string url; + make_url(src, baseurl, url); + const auto& img = m_images.find(url.c_str()); + if(img != m_images.end()) + { + if(img->second) + { + DrawBitmap(img->second,BPoint(pos.x,pos.y)); // TODO support scaling + //draw_txdib(cr, img->second.get(), pos.x, pos.y, pos.width, pos.height); + } + } +} + +void +LiteHtmlView::draw_background( litehtml::uint_ptr hdc, + const litehtml::background_paint& bg ) +{ + std::cout << "draw_background" << std::endl; + if (0 < bg.image.length()) + { + std::cout << " background includes an image!" << std::endl; + draw_image(hdc,bg.image.c_str(),m_base_url.c_str(),litehtml::position(bg.position_x,bg.position_y,bg.image_size.width,bg.image_size.height)); + } +} + +void +LiteHtmlView::draw_borders(litehtml::uint_ptr hdc, const litehtml::borders& borders, const litehtml::position& draw_pos, bool root) +{ + std::cout << "draw_borders" << std::endl; + int bdr_top = 0; + int bdr_bottom = 0; + int bdr_left = 0; + int bdr_right = 0; + + //std::cout << " uint ptr: " << +hdc << std::endl; + //std::cout << " this ptr: " << +this << std::endl; + + if(borders.top.width != 0 && borders.top.style > litehtml::border_style_hidden) + { + bdr_top = (int) borders.top.width; + std::cout << " Border top: " << bdr_right << std::endl; + } + if(borders.bottom.width != 0 && borders.bottom.style > litehtml::border_style_hidden) + { + bdr_bottom = (int) borders.bottom.width; + std::cout << " Border bottom: " << bdr_right << std::endl; + } + if(borders.left.width != 0 && borders.left.style > litehtml::border_style_hidden) + { + bdr_left = (int) borders.left.width; + std::cout << " Border left: " << bdr_right << std::endl; + } + if(borders.right.width != 0 && borders.right.style > litehtml::border_style_hidden) + { + bdr_right = (int) borders.right.width; + std::cout << " Border right: " << bdr_right << std::endl; + } + + + if (bdr_bottom) + { + // draw rectangle for now - no check for radius + StrokeRect( + BRect( + BPoint(draw_pos.left(), draw_pos.bottom()), + BPoint(draw_pos.left() + bdr_left, draw_pos.bottom() - bdr_bottom) + ) + ); + } +} + +void +LiteHtmlView::transform_text(litehtml::tstring& text, litehtml::text_transform tt) +{ + std::cout << "transform_text" << std::endl; +} + +void +LiteHtmlView::set_clip( const litehtml::position& pos, const litehtml::border_radiuses& bdr_radius ) +{ + std::cout << "set_clip" << std::endl; +} + +void +LiteHtmlView::del_clip() +{ + std::cout << "del_clip" << std::endl; +} + + + +std::shared_ptr +LiteHtmlView::create_element(const litehtml::tchar_t *tag_name, + const litehtml::string_map &attributes, + const std::shared_ptr &doc) +{ + //std::cout << "create_element" << std::endl; + return 0; +} + +void +LiteHtmlView::get_media_features(litehtml::media_features& media) const +{ + std::cout << "get_media_features" << std::endl; + litehtml::position client; + get_client_rect(client); + media.type = litehtml::media_type_screen; + media.width = client.width; + media.height = client.height; + BRect bounds(Bounds()); + media.device_width = bounds.Width(); + media.device_height = bounds.Height(); + media.color = 8; + media.monochrome = 0; + media.color_index = 256; + media.resolution = 96; +} + +void +LiteHtmlView::link(const std::shared_ptr &ptr, const litehtml::element::ptr& el) +{ + std::cout << "link" << std::endl; +} + +void +LiteHtmlView::set_caption(const char* caption) +{ + std::cout << "set_caption" << std::endl; +} + +void +LiteHtmlView::get_client_rect(litehtml::position& client) const +{ + //std::cout << "get_client_rect" << std::endl; + BRect bounds(Bounds()); + BPoint leftTop = bounds.LeftTop(); + client.width = bounds.Width(); + client.height = bounds.Height(); + client.x = leftTop.x; + client.y = leftTop.y; +} + +void +LiteHtmlView::on_anchor_click(const char* base, const litehtml::element::ptr& anchor) +{ + std::cout << "on_anchor_click" << std::endl; +} + +void +LiteHtmlView::set_cursor(const char* cursor) +{ + std::cout << "set_cursor" << std::endl; +} + +void +LiteHtmlView::import_css(litehtml::tstring& s1, const litehtml::tstring& s2, litehtml::tstring& s3) +{ + std::cout << "import_css" << std::endl; +} + +void +LiteHtmlView::get_language(litehtml::tstring& s1, litehtml::tstring& s2) const +{ + std::cout << "get_language" << std::endl; +} diff --git a/libs/litehtml/containers/haiku/container_haiku.h b/libs/litehtml/containers/haiku/container_haiku.h new file mode 100644 index 0000000000..77d0344975 --- /dev/null +++ b/libs/litehtml/containers/haiku/container_haiku.h @@ -0,0 +1,87 @@ +/* + * Copyright 2019-2020 Haiku Inc. + * All rights reserved. Distributed under the terms of the BSD 3-clause license. + * Constributors + * 2019-2020 Adam Fowler + */ +#ifndef LITEHTMLVIEW_H +#define LITEHTMLVIEW_H + +#include "../../include/litehtml.h" + +#include +#include + +#include + +class BBitmap; + + +enum { + M_HTML_RENDERED = 'hrnd' +}; + +class LiteHtmlView : public BView, public litehtml::document_container +{ +public: + //LiteHtmlView(BMessage *archive); + LiteHtmlView(BRect frame, const char *name); + //LiteHtmlView(const char *name, uint32 flags, BLayout *layout=NULL); + + virtual ~LiteHtmlView(); + + void SetContext(litehtml::context* ctx); + void RenderFile(const char* localFilePath); + void RenderHTML(const std::string& htmlText); + + + virtual litehtml::uint_ptr create_font(const litehtml::tchar_t* faceName, int size, int weight, litehtml::font_style italic, unsigned int decoration, litehtml::font_metrics* fm) override; + virtual void delete_font(litehtml::uint_ptr hFont) override; + virtual int text_width(const litehtml::tchar_t* text, litehtml::uint_ptr hFont) override; + virtual void draw_text(litehtml::uint_ptr hdc, const litehtml::tchar_t* text, litehtml::uint_ptr hFont, litehtml::web_color color, const litehtml::position& pos) override; + virtual int pt_to_px(int pt) override; + virtual int get_default_font_size() const override; + virtual const litehtml::tchar_t* get_default_font_name() const override; + virtual void load_image(const litehtml::tchar_t* src, const litehtml::tchar_t* baseurl, bool redraw_on_ready) override; + virtual void get_image_size(const litehtml::tchar_t* src, const litehtml::tchar_t* baseurl, litehtml::size& sz) override; + virtual void draw_background(litehtml::uint_ptr hdc, const litehtml::background_paint& bg) override; + virtual void draw_borders(litehtml::uint_ptr hdc, const litehtml::borders& borders, const litehtml::position& draw_pos, bool root) override; + virtual void draw_list_marker(litehtml::uint_ptr hdc, const litehtml::list_marker& marker) override; + virtual std::shared_ptr create_element(const litehtml::tchar_t *tag_name, + const litehtml::string_map &attributes, + const std::shared_ptr &doc) override; + virtual void get_media_features(litehtml::media_features& media) const override; + //virtual void get_language(litehtml::tstring& language, litehtml::tstring & culture) const override; + virtual void link(const std::shared_ptr &ptr, const litehtml::element::ptr& el) override; + + + virtual void transform_text(litehtml::tstring& text, litehtml::text_transform tt) override; + virtual void set_clip(const litehtml::position& pos, const litehtml::border_radiuses& bdr_radius) override; + virtual void del_clip() override; + + // unimplemented + virtual void set_caption(const char*); + virtual void get_client_rect(litehtml::position& client) const; + virtual void set_base_url(const char*); + virtual void on_anchor_click(const char*, const litehtml::element::ptr&); + virtual void set_cursor(const char*); + virtual void import_css(litehtml::tstring&, const litehtml::tstring&, litehtml::tstring&); + virtual void get_language(litehtml::tstring&, litehtml::tstring&) const; + + //BView + virtual void Draw(BRect updateRect) override; + virtual void GetPreferredSize(float* width, float* height) override; + +protected: + void make_url(const litehtml::tchar_t* url, const litehtml::tchar_t* basepath, litehtml::tstring& out); + virtual void draw_image( litehtml::uint_ptr hdc, const litehtml::tchar_t* src, const litehtml::tchar_t* baseurl, const litehtml::position& pos ); + +private: + litehtml::context* fContext; + litehtml::document::ptr m_html; + std::map m_images; + litehtml::tstring m_base_url; + litehtml::tstring m_url; +}; + +#endif diff --git a/libs/litehtml/containers/test/Bitmap.cpp b/libs/litehtml/containers/test/Bitmap.cpp new file mode 100644 index 0000000000..862d4844e7 --- /dev/null +++ b/libs/litehtml/containers/test/Bitmap.cpp @@ -0,0 +1,129 @@ +#include "Bitmap.h" +#include "lodepng.h" +using namespace std; + +web_color Bitmap::get_pixel(int x, int y) const +{ + if (x < 0 || x >= width || y < 0 || y >= height) + return web_color::black; + else + return data[x + y * width]; +} + +void Bitmap::set_pixel(int x, int y, web_color color) +{ + if (x < 0 || x >= width || y < 0 || y >= height) return; + if (color.alpha == 0) return; + data[x + y * width] = color; +} + +// endpoint is not drawn, like in GDI +void Bitmap::draw_line(int x0, int y0, int x1, int y1, web_color color) +{ + if (x0 != x1 && y0 != y1) return; // only horz and vert lines supported + + if (x0 == x1) // vert line + { + if (y0 > y1) swap(y0, y1); + for (int y = y0; y < y1; y++) + set_pixel(x0, y, color); + } + else if (y0 == y1) // horz line + { + if (x0 > x1) swap(x0, x1); + for (int x = x0; x < x1; x++) + set_pixel(x, y0, color); + } +} + +void Bitmap::draw_rect(int x, int y, int width, int height, web_color color) +{ + draw_line(x, y, x + width, y, color); // top + draw_line(x, y + height - 1, x + width, y + height - 1, color); // bottom + draw_line(x, y, x, y + height, color); // left + draw_line(x + width - 1, y, x + width - 1, y + height, color); // right +} + +void Bitmap::fill_rect(position rect, web_color color) +{ + for (int y = rect.top(); y < rect.bottom(); y++) + for (int x = rect.left(); x < rect.right(); x++) + set_pixel(x, y, color); +} + +void Bitmap::draw_bitmap(int x0, int y0, const Bitmap& bmp) +{ + for (int y = 0; y < bmp.height; y++) + for (int x = 0; x < bmp.width; x++) + set_pixel(x0 + x, y0 + y, bmp.get_pixel(x, y)); +} + +void Bitmap::replace_color(web_color original, web_color replacement) +{ + for (auto& pixel : data) + { + if (pixel == original) + pixel = replacement; + } +} + +// find minimal rectangle containing pixels different from bgcolor +position Bitmap::find_picture(web_color bgcolor) +{ + auto horz_line_empty = [&](int y) { + for (int x = 0; x < width; x++) + if (data[x + y * width] != bgcolor) return false; + return true; + }; + auto vert_line_empty = [&](int x) { + for (int y = 0; y < height; y++) + if (data[x + y * width] != bgcolor) return false; + return true; + }; + + position pos; + int y; + for (y = 0; y < height && horz_line_empty(y); y++); + if (y == height) return pos; // no picture + pos.y = y; + for (y = height - 1; y >= 0 && horz_line_empty(y); y--); + pos.height = y + 1 - pos.y; + + int x; + for (x = 0; x < width && vert_line_empty(x); x++); + pos.x = x; + for (x = width - 1; x >= 0 && vert_line_empty(x); x--); + pos.width = x + 1 - pos.x; + + return pos; +} + +void Bitmap::resize(int new_width, int new_height) +{ + vector new_data(new_width * new_height, web_color::white); + for (int y = 0; y < min(new_height, height); y++) + for (int x = 0; x < min(new_width, width); x++) + new_data[x + y * new_width] = data[x + y * width]; + + width = new_width; + height = new_height; + data = new_data; +} + +void Bitmap::load(string filename) +{ + vector image; + unsigned w, h; + lodepng::decode(image, w, h, filename); + if (w * h == 0) return; + + width = w; + height = h; + data.resize(w * h); + memcpy(data.data(), image.data(), w * h * 4); +} + +void Bitmap::save(string filename) +{ + lodepng::encode(filename, (byte*)data.data(), width, height); +} diff --git a/libs/litehtml/containers/test/Bitmap.h b/libs/litehtml/containers/test/Bitmap.h new file mode 100644 index 0000000000..bb66d190b0 --- /dev/null +++ b/libs/litehtml/containers/test/Bitmap.h @@ -0,0 +1,36 @@ +#include +using namespace litehtml; + +class Bitmap +{ +public: + int width = 0; + int height = 0; + std::vector data; + + Bitmap() {} + Bitmap(int width, int height, web_color color = web_color::white) : width(width), height(height) + { + data.resize(width * height, color); + } + Bitmap(string filename) + { + load(filename); + } + + bool operator==(const Bitmap& bmp) const { return width == bmp.width && height == bmp.height && data == bmp.data; } + bool operator!=(const Bitmap& bmp) const { return !(*this == bmp); } + + web_color get_pixel(int x, int y) const; + void set_pixel(int x, int y, web_color color); + void draw_line(int x0, int y0, int x1, int y1, web_color color); + void draw_rect(int x, int y, int width, int height, web_color color); + void fill_rect(position rect, web_color color); + void draw_bitmap(int x, int y, const Bitmap& bmp); + void replace_color(web_color original, web_color replacement); + + position find_picture(web_color bgcolor = web_color::white); + void resize(int new_width, int new_height); + void load(string filename); + void save(string filename); +}; \ No newline at end of file diff --git a/libs/litehtml/containers/test/Font.cpp b/libs/litehtml/containers/test/Font.cpp new file mode 100644 index 0000000000..5f8c42f396 --- /dev/null +++ b/libs/litehtml/containers/test/Font.cpp @@ -0,0 +1,126 @@ +#define _CRT_SECURE_NO_WARNINGS +#include "Font.h" +string readfile(string filename); +using namespace std; + +string Font::font_dir = "../containers/test/fonts/"; // ctest is run from litehtml/build +Font::size_name Font::installed_fonts[] = +{ + { 12, "terminus-ascii-bold-12px.yaff" }, + { 14, "terminus-ascii-bold-14px.yaff" }, + { 16, "terminus-ascii-bold-16px.yaff" }, + { 18, "terminus-ascii-bold-18px.yaff" }, + { 20, "terminus-ascii-bold-20px.yaff" }, + { 22, "terminus-ascii-bold-22px.yaff" }, + { 24, "terminus-ascii-bold-24px.yaff" }, + { 28, "terminus-ascii-bold-28px.yaff" }, + { 32, "terminus-ascii-bold-32px.yaff" }, + { 0, "" } +}; + +Font::Font(int size) +{ + // find most suitable font + int min_diff = 1000; + int n = 0; + for (int i = 0; installed_fonts[i].size; i++) + { + int diff = abs(installed_fonts[i].size - size); + if (diff < min_diff) + { + min_diff = diff; + n = i; + } + } + + load(font_dir + installed_fonts[n].name); +} + +Bitmap Font::get_glyph(int ch, web_color color) +{ + if (ch < 0 || ch >= 128 || glyphs[ch].width == 0) + { + Bitmap bmp(width, height, web_color::transparent); + bmp.draw_rect(1, 1, width - 2, height - 2, color); + return bmp; + } + else if (color != web_color::black) + { + Bitmap bmp = glyphs[ch]; + bmp.replace_color(web_color::black, color); + return bmp; + } + else + { + return glyphs[ch]; + } +} + +// load .yaff font file in an ad hoc manner (can't parse arbitrary yaff files) +void Font::load(string filename) +{ + string text = readfile(filename); + + string_vector lines; + split_string(text, lines, "\n"); + + int i; + // parse header + for (i = 0; i < (int) lines.size(); i++) + { + string line = lines[i]; + trim(line); + if (line.empty() || line[0] == '#') continue; // skip empty lines and comments + + auto sep = line.find(':'); + if (sep == string::npos) return; // line without ':' - error + + auto key = line.substr(0, sep); trim(key); + auto val = line.substr(sep + 1); trim(val); + if (val.empty()) break; // end of header + + if (key == "cell-size") sscanf(val.c_str(), "%d %d", &width, &height); + else if (key == "ascent") ascent = atoi(val.c_str()); + else if (key == "descent") descent = atoi(val.c_str()); + } + + // parse glyphs + + // only u+NNNN: label is recognized, all others are skipped + auto parse_key = [&]() { + int ch = -1; + for (; i < (int) lines.size(); i++) + { + string line = lines[i]; + trim(line); + if (line.empty()) continue; + if (line.find(':') == string::npos) break; // start of glyph data + if (line.substr(0, 2) == "u+") + sscanf(line.c_str(), "u+%X:", (unsigned int*) &ch); + } + return ch; + }; + + auto parse_glyph = [&](int ch) { + Bitmap& glyph = glyphs[ch] = Bitmap(width, height, web_color::transparent); + for (int y = 0; i < (int) lines.size() && y < height; i++, y++) + { + string line = lines[i]; + trim(line); + for (int x = 0; x < min((int)line.size(), width); x++) + { + if (line[x] == '@') + glyph.set_pixel(x, y, web_color::black); + } + } + }; + + while (i < (int) lines.size()) + { + int ch = parse_key(); + if (ch < 0 || ch >= 128) break; + parse_glyph(ch); + } + + x_height = glyphs['x'].find_picture(web_color::transparent).height; +} diff --git a/libs/litehtml/containers/test/Font.h b/libs/litehtml/containers/test/Font.h new file mode 100644 index 0000000000..4f3c01297d --- /dev/null +++ b/libs/litehtml/containers/test/Font.h @@ -0,0 +1,19 @@ +#include "Bitmap.h" + +class Font +{ +public: + int width = 0; + int height = 0; + int ascent = 0; + int descent = 0; + int x_height = 0; + Bitmap glyphs[128]; + + static string font_dir; + static struct size_name { int size; string name; } installed_fonts[]; + + Font(int size); + Bitmap get_glyph(int ch, web_color color); + void load(string filename); +}; \ No newline at end of file diff --git a/libs/litehtml/containers/test/fonts/OFL.txt b/libs/litehtml/containers/test/fonts/OFL.txt new file mode 100644 index 0000000000..a5c2627a14 --- /dev/null +++ b/libs/litehtml/containers/test/fonts/OFL.txt @@ -0,0 +1,94 @@ +Copyright (C) 2020 Dimitar Toshkov Zhekov, +with Reserved Font Name "Terminus Font". + +This Font Software is licensed under the SIL Open Font License, Version 1.1. +This license is copied below, and is also available with a FAQ at: +http://scripts.sil.org/OFL + + +----------------------------------------------------------- +SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007 +----------------------------------------------------------- + +PREAMBLE +The goals of the Open Font License (OFL) are to stimulate worldwide +development of collaborative font projects, to support the font creation +efforts of academic and linguistic communities, and to provide a free and +open framework in which fonts may be shared and improved in partnership +with others. + +The OFL allows the licensed fonts to be used, studied, modified and +redistributed freely as long as they are not sold by themselves. The +fonts, including any derivative works, can be bundled, embedded, +redistributed and/or sold with any software provided that any reserved +names are not used by derivative works. The fonts and derivatives, +however, cannot be released under any other type of license. The +requirement for fonts to remain under this license does not apply +to any document created using the fonts or their derivatives. + +DEFINITIONS +"Font Software" refers to the set of files released by the Copyright +Holder(s) under this license and clearly marked as such. This may +include source files, build scripts and documentation. + +"Reserved Font Name" refers to any names specified as such after the +copyright statement(s). + +"Original Version" refers to the collection of Font Software components as +distributed by the Copyright Holder(s). + +"Modified Version" refers to any derivative made by adding to, deleting, +or substituting -- in part or in whole -- any of the components of the +Original Version, by changing formats or by porting the Font Software to a +new environment. + +"Author" refers to any designer, engineer, programmer, technical +writer or other person who contributed to the Font Software. + +PERMISSION & CONDITIONS +Permission is hereby granted, free of charge, to any person obtaining +a copy of the Font Software, to use, study, copy, merge, embed, modify, +redistribute, and sell modified and unmodified copies of the Font +Software, subject to the following conditions: + +1) Neither the Font Software nor any of its individual components, +in Original or Modified Versions, may be sold by itself. + +2) Original or Modified Versions of the Font Software may be bundled, +redistributed and/or sold with any software, provided that each copy +contains the above copyright notice and this license. These can be +included either as stand-alone text files, human-readable headers or +in the appropriate machine-readable metadata fields within text or +binary files as long as those fields can be easily viewed by the user. + +3) No Modified Version of the Font Software may use the Reserved Font +Name(s) unless explicit written permission is granted by the corresponding +Copyright Holder. This restriction only applies to the primary font name as +presented to the users. + +4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font +Software shall not be used to promote, endorse or advertise any +Modified Version, except to acknowledge the contribution(s) of the +Copyright Holder(s) and the Author(s) or with their explicit written +permission. + +5) The Font Software, modified or unmodified, in part or in whole, +must be distributed entirely under this license, and must not be +distributed under any other license. The requirement for fonts to +remain under this license does not apply to any document created +using the Font Software. + +TERMINATION +This license becomes null and void if any of the above conditions are +not met. + +DISCLAIMER +THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF +MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT +OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE +COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, +INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL +DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING +FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM +OTHER DEALINGS IN THE FONT SOFTWARE. diff --git a/libs/litehtml/containers/test/fonts/readme.txt b/libs/litehtml/containers/test/fonts/readme.txt new file mode 100644 index 0000000000..a093284333 --- /dev/null +++ b/libs/litehtml/containers/test/fonts/readme.txt @@ -0,0 +1,12 @@ +Note: Fonts in this directory are not automatically picked up, you have to update Font::installed_fonts. + +Terminus Font: +Sizes: 6x12, 8x14, 8x16, 10x18, 10x20, 11x22, 12x24, 14x28, 16x32. +https://terminus-font.sourceforge.net +https://sourceforge.net/projects/terminus-font/files/terminus-font-4.49/terminus-font-4.49.1.tar.gz + +bdf -> yaff conversion: +https://github.com/robhagemans/monobit +pip install monobit +monobit-convert ter-u14b.bdf to ter-u14b.yaff +then manually removed non-ascii chars diff --git a/libs/litehtml/containers/test/fonts/terminus-ascii-bold-12px.yaff b/libs/litehtml/containers/test/fonts/terminus-ascii-bold-12px.yaff new file mode 100644 index 0000000000..0639cedfea --- /dev/null +++ b/libs/litehtml/containers/test/fonts/terminus-ascii-bold-12px.yaff @@ -0,0 +1,1463 @@ +name: Terminus Bold 6x12 +spacing: character-cell +cell-size: 6 12 +family: Terminus +foundry: xos4 +copyright: Copyright (C) 2020 Dimitar Toshkov Zhekov +notice: Licensed under the SIL Open Font License, Version 1.1 +point-size: 12 +weight: bold +slant: roman +setwidth: normal +dpi: 72 72 +average-width: 6 +ascent: 10 +descent: 2 +shift-up: -2 +encoding: iso10646-1 +default-char: u+fffd +min-word-space: 6 +converter: monobit v0.32 +source-name: ter-u12b.bdf +source-format: BDF v2.1 +history: load --format=bdf + +u+0000: +char0: + ...... + ...... + @@.@@. + @...@. + ...... + @...@. + @...@. + ...... + @...@. + @@.@@. + ...... + ...... + +u+0020: +space: + ...... + ...... + ...... + ...... + ...... + ...... + ...... + ...... + ...... + ...... + ...... + ...... + +u+0021: +exclam: + ...... + ...... + ..@... + ..@... + ..@... + ..@... + ..@... + ...... + ..@... + ..@... + ...... + ...... + +u+0022: +quotedbl: + ...... + .@.@.. + .@.@.. + .@.@.. + ...... + ...... + ...... + ...... + ...... + ...... + ...... + ...... + +u+0023: +numbersign: + ...... + ...... + .@.@.. + .@.@.. + @@@@@. + .@.@.. + .@.@.. + @@@@@. + .@.@.. + .@.@.. + ...... + ...... + +u+0024: +dollar: + ...... + ...... + ..@... + .@@@.. + @.@.@. + @.@... + .@@@.. + ..@.@. + @.@.@. + .@@@.. + ..@... + ...... + +u+0025: +percent: + ...... + ...... + .@..@. + @.@.@. + .@.@.. + ...@.. + ..@... + ..@.@. + .@.@.@ + .@..@. + ...... + ...... + +u+0026: +ampersand: + ...... + ...... + ..@... + .@.@.. + .@.@.. + ..@... + .@@.@. + @..@.. + @..@.. + .@@.@. + ...... + ...... + +u+0027: +quotesingle: + ...... + ..@... + ..@... 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................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ...@@@@@@@@@@@.. + ..@@@@@@@@@@@@.. + .@@@@......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@@......@@@.. + ..@@@@@@@@@@@@.. + ...@@@@@@@@@@@.. + ...........@@@.. + ...........@@@.. + ...........@@@.. + ...........@@@.. + ...........@@@.. + ................ + +u+0072: +"r": + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + .@@@..@@@@@@@@.. + .@@@.@@@@@@@@@.. + .@@@@@@......... + .@@@@@.......... + .@@@@........... + .@@@............ + .@@@............ + .@@@............ + .@@@............ + .@@@............ + .@@@............ + .@@@............ + .@@@............ + .@@@............ + ................ + ................ + ................ + ................ + ................ + ................ + +u+0073: +"s": + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ...@@@@@@@@@.... + ..@@@@@@@@@@@... + .@@@@.....@@@@.. + .@@@............ + .@@@............ + .@@@@........... + ..@@@@@@@@@@.... + ...@@@@@@@@@@... + ..........@@@@.. + ...........@@@.. + ...........@@@.. + .@@@@.....@@@@.. + ..@@@@@@@@@@@... + ...@@@@@@@@@.... + ................ + ................ + ................ + ................ + ................ + ................ + +u+0074: +"t": + ................ + ................ + ................ + ................ + ................ + ................ + .....@@@........ + .....@@@........ + .....@@@........ + .....@@@........ + .....@@@........ + .....@@@........ + .@@@@@@@@@@@.... + .@@@@@@@@@@@.... + .....@@@........ + .....@@@........ + .....@@@........ + .....@@@........ + .....@@@........ + .....@@@........ + .....@@@........ + .....@@@........ + .....@@@........ + .....@@@@....... + ......@@@@@@@@.. + .......@@@@@@@.. + ................ + ................ + ................ + ................ + ................ + ................ + +u+0075: +"u": + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@@......@@@.. + ..@@@@@@@@@@@@.. + ...@@@@@@@@@@@.. + ................ + ................ + ................ + ................ + ................ + ................ + +u+0076: +"v": + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + ..@@@.....@@@... + ..@@@.....@@@... + ..@@@.....@@@... + ...@@@...@@@.... + ...@@@...@@@.... + ...@@@...@@@.... + ....@@@.@@@..... + ....@@@.@@@..... + .....@@@@@...... + .....@@@@@...... + .....@@@@@...... + ................ + ................ + ................ + ................ + ................ + ................ + +u+0077: +"w": + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@..@@@..@@@.. + .@@@..@@@..@@@.. + .@@@..@@@..@@@.. + .@@@..@@@..@@@.. + .@@@..@@@..@@@.. + .@@@..@@@..@@@.. + .@@@..@@@..@@@.. + .@@@@.@@@.@@@@.. + ..@@@@@@@@@@@... + ...@@@@@@@@@.... + ................ + ................ + ................ + ................ + ................ + ................ + +u+0078: +"x": + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + ..@@@.....@@@... + ...@@@...@@@.... + ....@@@.@@@..... + .....@@@@@...... + .....@@@@@...... + ....@@@.@@@..... + ...@@@...@@@.... + ..@@@.....@@@... + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + ................ + ................ + ................ + ................ + ................ + ................ + +u+0079: +"y": + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@.......@@@.. + .@@@@......@@@.. + ..@@@@@@@@@@@@.. + ...@@@@@@@@@@@.. + ...........@@@.. + ...........@@@.. + ..........@@@@.. + ..@@@@@@@@@@@... + ..@@@@@@@@@@.... + ................ + +u+007a: +"z": + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + .@@@@@@@@@@@@@.. + .@@@@@@@@@@@@@.. + ..........@@@... + .........@@@.... + ........@@@..... + .......@@@...... + ......@@@....... + .....@@@........ + ....@@@......... + ...@@@.......... + ..@@@........... + .@@@............ + .@@@@@@@@@@@@@.. + .@@@@@@@@@@@@@.. + ................ + ................ + ................ + ................ + ................ + ................ + +u+007b: +braceleft: + ................ + ................ + ................ + ................ + ................ + ................ + .......@@@@@.... + ......@@@@@@.... + .....@@@@....... + .....@@@........ + .....@@@........ + .....@@@........ + .....@@@........ + .....@@@........ + .....@@@........ + ..@@@@@......... + ..@@@@@......... + .....@@@........ + .....@@@........ + .....@@@........ + .....@@@........ + .....@@@........ + .....@@@........ + .....@@@@....... + ......@@@@@@.... + .......@@@@@.... + ................ + ................ + ................ + ................ + ................ + ................ + +u+007c: +bar: + ................ + ................ + ................ + ................ + ................ + ................ + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ................ + ................ + ................ + ................ + ................ + ................ + +u+007d: +braceright: + ................ + ................ + ................ + ................ + ................ + ................ + ..@@@@@......... + ..@@@@@@........ + .....@@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + .......@@@@@.... + .......@@@@@.... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + ......@@@....... + .....@@@@....... + ..@@@@@@........ + ..@@@@@......... + ................ + ................ + ................ + ................ + ................ + ................ + +u+007e: +asciitilde: + ................ + ................ + ................ + ................ + ...@@@@....@@@.. + ..@@@@@@...@@@.. + .@@@.@@@@..@@@.. + .@@@..@@@@.@@@.. + .@@@...@@@@@@... + .@@@....@@@@.... + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ + ................ diff --git a/libs/litehtml/containers/test/lodepng.cpp b/libs/litehtml/containers/test/lodepng.cpp new file mode 100644 index 0000000000..abf4ed4d82 --- /dev/null +++ b/libs/litehtml/containers/test/lodepng.cpp @@ -0,0 +1,6661 @@ +// stasoid: disabled warnings 4334 and 4267 +/* +LodePNG version 20221108 + +Copyright (c) 2005-2022 Lode Vandevenne + +This software is provided 'as-is', without any express or implied +warranty. In no event will the authors be held liable for any damages +arising from the use of this software. + +Permission is granted to anyone to use this software for any purpose, +including commercial applications, and to alter it and redistribute it +freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + + 3. This notice may not be removed or altered from any source + distribution. +*/ + +/* +The manual and changelog are in the header file "lodepng.h" +Rename this file to lodepng.cpp to use it for C++, or to lodepng.c to use it for C. +*/ + +#include "lodepng.h" + +#ifdef LODEPNG_COMPILE_DISK +#include /* LONG_MAX */ +#include /* file handling */ +#endif /* LODEPNG_COMPILE_DISK */ + +#ifdef LODEPNG_COMPILE_ALLOCATORS +#include /* allocations */ +#endif /* LODEPNG_COMPILE_ALLOCATORS */ + +#if defined(_MSC_VER) && (_MSC_VER >= 1310) /*Visual Studio: A few warning types are not desired here.*/ +#pragma warning( disable : 4244 ) /*implicit conversions: not warned by gcc -Wall -Wextra and requires too much casts*/ +#pragma warning( disable : 4996 ) /*VS does not like fopen, but fopen_s is not standard C so unusable here*/ +#pragma warning( disable : 4334 ) // result of 32-bit shift implicitly converted to 64 bits (was 64-bit shift intended?) +#pragma warning( disable : 4267 ) // conversion from 'size_t' to 'unsigned short', possible loss of data +#endif /*_MSC_VER */ + +const char* LODEPNG_VERSION_STRING = "20221108"; + +/* +This source file is divided into the following large parts. The code sections +with the "LODEPNG_COMPILE_" #defines divide this up further in an intermixed way. +-Tools for C and common code for PNG and Zlib +-C Code for Zlib (huffman, deflate, ...) +-C Code for PNG (file format chunks, adam7, PNG filters, color conversions, ...) +-The C++ wrapper around all of the above +*/ + +/* ////////////////////////////////////////////////////////////////////////// */ +/* ////////////////////////////////////////////////////////////////////////// */ +/* // Tools for C, and common code for PNG and Zlib. // */ +/* ////////////////////////////////////////////////////////////////////////// */ +/* ////////////////////////////////////////////////////////////////////////// */ + +/*The malloc, realloc and free functions defined here with "lodepng_" in front +of the name, so that you can easily change them to others related to your +platform if needed. Everything else in the code calls these. Pass +-DLODEPNG_NO_COMPILE_ALLOCATORS to the compiler, or comment out +#define LODEPNG_COMPILE_ALLOCATORS in the header, to disable the ones here and +define them in your own project's source files without needing to change +lodepng source code. Don't forget to remove "static" if you copypaste them +from here.*/ + +#ifdef LODEPNG_COMPILE_ALLOCATORS +static void* lodepng_malloc(size_t size) { +#ifdef LODEPNG_MAX_ALLOC + if(size > LODEPNG_MAX_ALLOC) return 0; +#endif + return malloc(size); +} + +/* NOTE: when realloc returns NULL, it leaves the original memory untouched */ +static void* lodepng_realloc(void* ptr, size_t new_size) { +#ifdef LODEPNG_MAX_ALLOC + if(new_size > LODEPNG_MAX_ALLOC) return 0; +#endif + return realloc(ptr, new_size); +} + +static void lodepng_free(void* ptr) { + free(ptr); +} +#else /*LODEPNG_COMPILE_ALLOCATORS*/ +/* TODO: support giving additional void* payload to the custom allocators */ +void* lodepng_malloc(size_t size); +void* lodepng_realloc(void* ptr, size_t new_size); +void lodepng_free(void* ptr); +#endif /*LODEPNG_COMPILE_ALLOCATORS*/ + +/* convince the compiler to inline a function, for use when this measurably improves performance */ +/* inline is not available in C90, but use it when supported by the compiler */ +#if (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)) || (defined(__cplusplus) && (__cplusplus >= 199711L)) +#define LODEPNG_INLINE inline +#else +#define LODEPNG_INLINE /* not available */ +#endif + +/* restrict is not available in C90, but use it when supported by the compiler */ +#if (defined(__GNUC__) && (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1))) ||\ + (defined(_MSC_VER) && (_MSC_VER >= 1400)) || \ + (defined(__WATCOMC__) && (__WATCOMC__ >= 1250) && !defined(__cplusplus)) +#define LODEPNG_RESTRICT __restrict +#else +#define LODEPNG_RESTRICT /* not available */ +#endif + +/* Replacements for C library functions such as memcpy and strlen, to support platforms +where a full C library is not available. The compiler can recognize them and compile +to something as fast. */ + +static void lodepng_memcpy(void* LODEPNG_RESTRICT dst, + const void* LODEPNG_RESTRICT src, size_t size) { + size_t i; + for(i = 0; i < size; i++) ((char*)dst)[i] = ((const char*)src)[i]; +} + +static void lodepng_memset(void* LODEPNG_RESTRICT dst, + int value, size_t num) { + size_t i; + for(i = 0; i < num; i++) ((char*)dst)[i] = (char)value; +} + +/* does not check memory out of bounds, do not use on untrusted data */ +static size_t lodepng_strlen(const char* a) { + const char* orig = a; + /* avoid warning about unused function in case of disabled COMPILE... macros */ + (void)(&lodepng_strlen); + while(*a) a++; + return (size_t)(a - orig); +} + +#define LODEPNG_MAX(a, b) (((a) > (b)) ? (a) : (b)) +#define LODEPNG_MIN(a, b) (((a) < (b)) ? (a) : (b)) +#define LODEPNG_ABS(x) ((x) < 0 ? -(x) : (x)) + +#if defined(LODEPNG_COMPILE_PNG) || defined(LODEPNG_COMPILE_DECODER) +/* Safely check if adding two integers will overflow (no undefined +behavior, compiler removing the code, etc...) and output result. */ +static int lodepng_addofl(size_t a, size_t b, size_t* result) { + *result = a + b; /* Unsigned addition is well defined and safe in C90 */ + return *result < a; +} +#endif /*defined(LODEPNG_COMPILE_PNG) || defined(LODEPNG_COMPILE_DECODER)*/ + +#ifdef LODEPNG_COMPILE_DECODER +/* Safely check if multiplying two integers will overflow (no undefined +behavior, compiler removing the code, etc...) and output result. */ +static int lodepng_mulofl(size_t a, size_t b, size_t* result) { + *result = a * b; /* Unsigned multiplication is well defined and safe in C90 */ + return (a != 0 && *result / a != b); +} + +#ifdef LODEPNG_COMPILE_ZLIB +/* Safely check if a + b > c, even if overflow could happen. */ +static int lodepng_gtofl(size_t a, size_t b, size_t c) { + size_t d; + if(lodepng_addofl(a, b, &d)) return 1; + return d > c; +} +#endif /*LODEPNG_COMPILE_ZLIB*/ +#endif /*LODEPNG_COMPILE_DECODER*/ + + +/* +Often in case of an error a value is assigned to a variable and then it breaks +out of a loop (to go to the cleanup phase of a function). This macro does that. +It makes the error handling code shorter and more readable. + +Example: if(!uivector_resize(&lz77_encoded, datasize)) ERROR_BREAK(83); +*/ +#define CERROR_BREAK(errorvar, code){\ + errorvar = code;\ + break;\ +} + +/*version of CERROR_BREAK that assumes the common case where the error variable is named "error"*/ +#define ERROR_BREAK(code) CERROR_BREAK(error, code) + +/*Set error var to the error code, and return it.*/ +#define CERROR_RETURN_ERROR(errorvar, code){\ + errorvar = code;\ + return code;\ +} + +/*Try the code, if it returns error, also return the error.*/ +#define CERROR_TRY_RETURN(call){\ + unsigned error = call;\ + if(error) return error;\ +} + +/*Set error var to the error code, and return from the void function.*/ +#define CERROR_RETURN(errorvar, code){\ + errorvar = code;\ + return;\ +} + +/* +About uivector, ucvector and string: +-All of them wrap dynamic arrays or text strings in a similar way. +-LodePNG was originally written in C++. The vectors replace the std::vectors that were used in the C++ version. +-The string tools are made to avoid problems with compilers that declare things like strncat as deprecated. +-They're not used in the interface, only internally in this file as static functions. +-As with many other structs in this file, the init and cleanup functions serve as ctor and dtor. +*/ + +#ifdef LODEPNG_COMPILE_ZLIB +#ifdef LODEPNG_COMPILE_ENCODER +/*dynamic vector of unsigned ints*/ +typedef struct uivector { + unsigned* data; + size_t size; /*size in number of unsigned longs*/ + size_t allocsize; /*allocated size in bytes*/ +} uivector; + +static void uivector_cleanup(void* p) { + ((uivector*)p)->size = ((uivector*)p)->allocsize = 0; + lodepng_free(((uivector*)p)->data); + ((uivector*)p)->data = NULL; +} + +/*returns 1 if success, 0 if failure ==> nothing done*/ +static unsigned uivector_resize(uivector* p, size_t size) { + size_t allocsize = size * sizeof(unsigned); + if(allocsize > p->allocsize) { + size_t newsize = allocsize + (p->allocsize >> 1u); + void* data = lodepng_realloc(p->data, newsize); + if(data) { + p->allocsize = newsize; + p->data = (unsigned*)data; + } + else return 0; /*error: not enough memory*/ + } + p->size = size; + return 1; /*success*/ +} + +static void uivector_init(uivector* p) { + p->data = NULL; + p->size = p->allocsize = 0; +} + +/*returns 1 if success, 0 if failure ==> nothing done*/ +static unsigned uivector_push_back(uivector* p, unsigned c) { + if(!uivector_resize(p, p->size + 1)) return 0; + p->data[p->size - 1] = c; + return 1; +} +#endif /*LODEPNG_COMPILE_ENCODER*/ +#endif /*LODEPNG_COMPILE_ZLIB*/ + +/* /////////////////////////////////////////////////////////////////////////// */ + +/*dynamic vector of unsigned chars*/ +typedef struct ucvector { + unsigned char* data; + size_t size; /*used size*/ + size_t allocsize; /*allocated size*/ +} ucvector; + +/*returns 1 if success, 0 if failure ==> nothing done*/ +static unsigned ucvector_reserve(ucvector* p, size_t size) { + if(size > p->allocsize) { + size_t newsize = size + (p->allocsize >> 1u); + void* data = lodepng_realloc(p->data, newsize); + if(data) { + p->allocsize = newsize; + p->data = (unsigned char*)data; + } + else return 0; /*error: not enough memory*/ + } + return 1; /*success*/ +} + +/*returns 1 if success, 0 if failure ==> nothing done*/ +static unsigned ucvector_resize(ucvector* p, size_t size) { + p->size = size; + return ucvector_reserve(p, size); +} + +static ucvector ucvector_init(unsigned char* buffer, size_t size) { + ucvector v; + v.data = buffer; + v.allocsize = v.size = size; + return v; +} + +/* ////////////////////////////////////////////////////////////////////////// */ + +#ifdef LODEPNG_COMPILE_PNG +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + +/*free string pointer and set it to NULL*/ +static void string_cleanup(char** out) { + lodepng_free(*out); + *out = NULL; +} + +/*also appends null termination character*/ +static char* alloc_string_sized(const char* in, size_t insize) { + char* out = (char*)lodepng_malloc(insize + 1); + if(out) { + lodepng_memcpy(out, in, insize); + out[insize] = 0; + } + return out; +} + +/* dynamically allocates a new string with a copy of the null terminated input text */ +static char* alloc_string(const char* in) { + return alloc_string_sized(in, lodepng_strlen(in)); +} +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ +#endif /*LODEPNG_COMPILE_PNG*/ + +/* ////////////////////////////////////////////////////////////////////////// */ + +#if defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_PNG) +static unsigned lodepng_read32bitInt(const unsigned char* buffer) { + return (((unsigned)buffer[0] << 24u) | ((unsigned)buffer[1] << 16u) | + ((unsigned)buffer[2] << 8u) | (unsigned)buffer[3]); +} +#endif /*defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_PNG)*/ + +#if defined(LODEPNG_COMPILE_PNG) || defined(LODEPNG_COMPILE_ENCODER) +/*buffer must have at least 4 allocated bytes available*/ +static void lodepng_set32bitInt(unsigned char* buffer, unsigned value) { + buffer[0] = (unsigned char)((value >> 24) & 0xff); + buffer[1] = (unsigned char)((value >> 16) & 0xff); + buffer[2] = (unsigned char)((value >> 8) & 0xff); + buffer[3] = (unsigned char)((value ) & 0xff); +} +#endif /*defined(LODEPNG_COMPILE_PNG) || defined(LODEPNG_COMPILE_ENCODER)*/ + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / File IO / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +#ifdef LODEPNG_COMPILE_DISK + +/* returns negative value on error. This should be pure C compatible, so no fstat. */ +static long lodepng_filesize(const char* filename) { + FILE* file; + long size; + file = fopen(filename, "rb"); + if(!file) return -1; + + if(fseek(file, 0, SEEK_END) != 0) { + fclose(file); + return -1; + } + + size = ftell(file); + /* It may give LONG_MAX as directory size, this is invalid for us. */ + if(size == LONG_MAX) size = -1; + + fclose(file); + return size; +} + +/* load file into buffer that already has the correct allocated size. Returns error code.*/ +static unsigned lodepng_buffer_file(unsigned char* out, size_t size, const char* filename) { + FILE* file; + size_t readsize; + file = fopen(filename, "rb"); + if(!file) return 78; + + readsize = fread(out, 1, size, file); + fclose(file); + + if(readsize != size) return 78; + return 0; +} + +unsigned lodepng_load_file(unsigned char** out, size_t* outsize, const char* filename) { + long size = lodepng_filesize(filename); + if(size < 0) return 78; + *outsize = (size_t)size; + + *out = (unsigned char*)lodepng_malloc((size_t)size); + if(!(*out) && size > 0) return 83; /*the above malloc failed*/ + + return lodepng_buffer_file(*out, (size_t)size, filename); +} + +/*write given buffer to the file, overwriting the file, it doesn't append to it.*/ +unsigned lodepng_save_file(const unsigned char* buffer, size_t buffersize, const char* filename) { + FILE* file; + file = fopen(filename, "wb" ); + if(!file) return 79; + fwrite(buffer, 1, buffersize, file); + fclose(file); + return 0; +} + +#endif /*LODEPNG_COMPILE_DISK*/ + +/* ////////////////////////////////////////////////////////////////////////// */ +/* ////////////////////////////////////////////////////////////////////////// */ +/* // End of common code and tools. Begin of Zlib related code. // */ +/* ////////////////////////////////////////////////////////////////////////// */ +/* ////////////////////////////////////////////////////////////////////////// */ + +#ifdef LODEPNG_COMPILE_ZLIB +#ifdef LODEPNG_COMPILE_ENCODER + +typedef struct { + ucvector* data; + unsigned char bp; /*ok to overflow, indicates bit pos inside byte*/ +} LodePNGBitWriter; + +static void LodePNGBitWriter_init(LodePNGBitWriter* writer, ucvector* data) { + writer->data = data; + writer->bp = 0; +} + +/*TODO: this ignores potential out of memory errors*/ +#define WRITEBIT(writer, bit){\ + /* append new byte */\ + if(((writer->bp) & 7u) == 0) {\ + if(!ucvector_resize(writer->data, writer->data->size + 1)) return;\ + writer->data->data[writer->data->size - 1] = 0;\ + }\ + (writer->data->data[writer->data->size - 1]) |= (bit << ((writer->bp) & 7u));\ + ++writer->bp;\ +} + +/* LSB of value is written first, and LSB of bytes is used first */ +static void writeBits(LodePNGBitWriter* writer, unsigned value, size_t nbits) { + if(nbits == 1) { /* compiler should statically compile this case if nbits == 1 */ + WRITEBIT(writer, value); + } else { + /* TODO: increase output size only once here rather than in each WRITEBIT */ + size_t i; + for(i = 0; i != nbits; ++i) { + WRITEBIT(writer, (unsigned char)((value >> i) & 1)); + } + } +} + +/* This one is to use for adding huffman symbol, the value bits are written MSB first */ +static void writeBitsReversed(LodePNGBitWriter* writer, unsigned value, size_t nbits) { + size_t i; + for(i = 0; i != nbits; ++i) { + /* TODO: increase output size only once here rather than in each WRITEBIT */ + WRITEBIT(writer, (unsigned char)((value >> (nbits - 1u - i)) & 1u)); + } +} +#endif /*LODEPNG_COMPILE_ENCODER*/ + +#ifdef LODEPNG_COMPILE_DECODER + +typedef struct { + const unsigned char* data; + size_t size; /*size of data in bytes*/ + size_t bitsize; /*size of data in bits, end of valid bp values, should be 8*size*/ + size_t bp; + unsigned buffer; /*buffer for reading bits. NOTE: 'unsigned' must support at least 32 bits*/ +} LodePNGBitReader; + +/* data size argument is in bytes. Returns error if size too large causing overflow */ +static unsigned LodePNGBitReader_init(LodePNGBitReader* reader, const unsigned char* data, size_t size) { + size_t temp; + reader->data = data; + reader->size = size; + /* size in bits, return error if overflow (if size_t is 32 bit this supports up to 500MB) */ + if(lodepng_mulofl(size, 8u, &reader->bitsize)) return 105; + /*ensure incremented bp can be compared to bitsize without overflow even when it would be incremented 32 too much and + trying to ensure 32 more bits*/ + if(lodepng_addofl(reader->bitsize, 64u, &temp)) return 105; + reader->bp = 0; + reader->buffer = 0; + return 0; /*ok*/ +} + +/* +ensureBits functions: +Ensures the reader can at least read nbits bits in one or more readBits calls, +safely even if not enough bits are available. +The nbits parameter is unused but is given for documentation purposes, error +checking for amount of bits must be done beforehand. +*/ + +/*See ensureBits documentation above. This one ensures up to 9 bits */ +static LODEPNG_INLINE void ensureBits9(LodePNGBitReader* reader, size_t nbits) { + size_t start = reader->bp >> 3u; + size_t size = reader->size; + if(start + 1u < size) { + reader->buffer = (unsigned)reader->data[start + 0] | ((unsigned)reader->data[start + 1] << 8u); + reader->buffer >>= (reader->bp & 7u); + } else { + reader->buffer = 0; + if(start + 0u < size) reader->buffer = reader->data[start + 0]; + reader->buffer >>= (reader->bp & 7u); + } + (void)nbits; +} + +/*See ensureBits documentation above. This one ensures up to 17 bits */ +static LODEPNG_INLINE void ensureBits17(LodePNGBitReader* reader, size_t nbits) { + size_t start = reader->bp >> 3u; + size_t size = reader->size; + if(start + 2u < size) { + reader->buffer = (unsigned)reader->data[start + 0] | ((unsigned)reader->data[start + 1] << 8u) | + ((unsigned)reader->data[start + 2] << 16u); + reader->buffer >>= (reader->bp & 7u); + } else { + reader->buffer = 0; + if(start + 0u < size) reader->buffer |= reader->data[start + 0]; + if(start + 1u < size) reader->buffer |= ((unsigned)reader->data[start + 1] << 8u); + reader->buffer >>= (reader->bp & 7u); + } + (void)nbits; +} + +/*See ensureBits documentation above. This one ensures up to 25 bits */ +static LODEPNG_INLINE void ensureBits25(LodePNGBitReader* reader, size_t nbits) { + size_t start = reader->bp >> 3u; + size_t size = reader->size; + if(start + 3u < size) { + reader->buffer = (unsigned)reader->data[start + 0] | ((unsigned)reader->data[start + 1] << 8u) | + ((unsigned)reader->data[start + 2] << 16u) | ((unsigned)reader->data[start + 3] << 24u); + reader->buffer >>= (reader->bp & 7u); + } else { + reader->buffer = 0; + if(start + 0u < size) reader->buffer |= reader->data[start + 0]; + if(start + 1u < size) reader->buffer |= ((unsigned)reader->data[start + 1] << 8u); + if(start + 2u < size) reader->buffer |= ((unsigned)reader->data[start + 2] << 16u); + reader->buffer >>= (reader->bp & 7u); + } + (void)nbits; +} + +/*See ensureBits documentation above. This one ensures up to 32 bits */ +static LODEPNG_INLINE void ensureBits32(LodePNGBitReader* reader, size_t nbits) { + size_t start = reader->bp >> 3u; + size_t size = reader->size; + if(start + 4u < size) { + reader->buffer = (unsigned)reader->data[start + 0] | ((unsigned)reader->data[start + 1] << 8u) | + ((unsigned)reader->data[start + 2] << 16u) | ((unsigned)reader->data[start + 3] << 24u); + reader->buffer >>= (reader->bp & 7u); + reader->buffer |= (((unsigned)reader->data[start + 4] << 24u) << (8u - (reader->bp & 7u))); + } else { + reader->buffer = 0; + if(start + 0u < size) reader->buffer |= reader->data[start + 0]; + if(start + 1u < size) reader->buffer |= ((unsigned)reader->data[start + 1] << 8u); + if(start + 2u < size) reader->buffer |= ((unsigned)reader->data[start + 2] << 16u); + if(start + 3u < size) reader->buffer |= ((unsigned)reader->data[start + 3] << 24u); + reader->buffer >>= (reader->bp & 7u); + } + (void)nbits; +} + +/* Get bits without advancing the bit pointer. Must have enough bits available with ensureBits. Max nbits is 31. */ +static LODEPNG_INLINE unsigned peekBits(LodePNGBitReader* reader, size_t nbits) { + /* The shift allows nbits to be only up to 31. */ + return reader->buffer & ((1u << nbits) - 1u); +} + +/* Must have enough bits available with ensureBits */ +static LODEPNG_INLINE void advanceBits(LodePNGBitReader* reader, size_t nbits) { + reader->buffer >>= nbits; + reader->bp += nbits; +} + +/* Must have enough bits available with ensureBits */ +static LODEPNG_INLINE unsigned readBits(LodePNGBitReader* reader, size_t nbits) { + unsigned result = peekBits(reader, nbits); + advanceBits(reader, nbits); + return result; +} +#endif /*LODEPNG_COMPILE_DECODER*/ + +static unsigned reverseBits(unsigned bits, unsigned num) { + /*TODO: implement faster lookup table based version when needed*/ + unsigned i, result = 0; + for(i = 0; i < num; i++) result |= ((bits >> (num - i - 1u)) & 1u) << i; + return result; +} + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / Deflate - Huffman / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +#define FIRST_LENGTH_CODE_INDEX 257 +#define LAST_LENGTH_CODE_INDEX 285 +/*256 literals, the end code, some length codes, and 2 unused codes*/ +#define NUM_DEFLATE_CODE_SYMBOLS 288 +/*the distance codes have their own symbols, 30 used, 2 unused*/ +#define NUM_DISTANCE_SYMBOLS 32 +/*the code length codes. 0-15: code lengths, 16: copy previous 3-6 times, 17: 3-10 zeros, 18: 11-138 zeros*/ +#define NUM_CODE_LENGTH_CODES 19 + +/*the base lengths represented by codes 257-285*/ +static const unsigned LENGTHBASE[29] + = {3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, 35, 43, 51, 59, + 67, 83, 99, 115, 131, 163, 195, 227, 258}; + +/*the extra bits used by codes 257-285 (added to base length)*/ +static const unsigned LENGTHEXTRA[29] + = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, + 4, 4, 4, 4, 5, 5, 5, 5, 0}; + +/*the base backwards distances (the bits of distance codes appear after length codes and use their own huffman tree)*/ +static const unsigned DISTANCEBASE[30] + = {1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385, 513, + 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577}; + +/*the extra bits of backwards distances (added to base)*/ +static const unsigned DISTANCEEXTRA[30] + = {0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, + 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13}; + +/*the order in which "code length alphabet code lengths" are stored as specified by deflate, out of this the huffman +tree of the dynamic huffman tree lengths is generated*/ +static const unsigned CLCL_ORDER[NUM_CODE_LENGTH_CODES] + = {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15}; + +/* ////////////////////////////////////////////////////////////////////////// */ + +/* +Huffman tree struct, containing multiple representations of the tree +*/ +typedef struct HuffmanTree { + unsigned* codes; /*the huffman codes (bit patterns representing the symbols)*/ + unsigned* lengths; /*the lengths of the huffman codes*/ + unsigned maxbitlen; /*maximum number of bits a single code can get*/ + unsigned numcodes; /*number of symbols in the alphabet = number of codes*/ + /* for reading only */ + unsigned char* table_len; /*length of symbol from lookup table, or max length if secondary lookup needed*/ + unsigned short* table_value; /*value of symbol from lookup table, or pointer to secondary table if needed*/ +} HuffmanTree; + +static void HuffmanTree_init(HuffmanTree* tree) { + tree->codes = 0; + tree->lengths = 0; + tree->table_len = 0; + tree->table_value = 0; +} + +static void HuffmanTree_cleanup(HuffmanTree* tree) { + lodepng_free(tree->codes); + lodepng_free(tree->lengths); + lodepng_free(tree->table_len); + lodepng_free(tree->table_value); +} + +/* amount of bits for first huffman table lookup (aka root bits), see HuffmanTree_makeTable and huffmanDecodeSymbol.*/ +/* values 8u and 9u work the fastest */ +#define FIRSTBITS 9u + +/* a symbol value too big to represent any valid symbol, to indicate reading disallowed huffman bits combination, +which is possible in case of only 0 or 1 present symbols. */ +#define INVALIDSYMBOL 65535u + +/* make table for huffman decoding */ +static unsigned HuffmanTree_makeTable(HuffmanTree* tree) { + static const unsigned headsize = 1u << FIRSTBITS; /*size of the first table*/ + static const unsigned mask = (1u << FIRSTBITS) /*headsize*/ - 1u; + size_t i, numpresent, pointer, size; /*total table size*/ + unsigned* maxlens = (unsigned*)lodepng_malloc(headsize * sizeof(unsigned)); + if(!maxlens) return 83; /*alloc fail*/ + + /* compute maxlens: max total bit length of symbols sharing prefix in the first table*/ + lodepng_memset(maxlens, 0, headsize * sizeof(*maxlens)); + for(i = 0; i < tree->numcodes; i++) { + unsigned symbol = tree->codes[i]; + unsigned l = tree->lengths[i]; + unsigned index; + if(l <= FIRSTBITS) continue; /*symbols that fit in first table don't increase secondary table size*/ + /*get the FIRSTBITS MSBs, the MSBs of the symbol are encoded first. See later comment about the reversing*/ + index = reverseBits(symbol >> (l - FIRSTBITS), FIRSTBITS); + maxlens[index] = LODEPNG_MAX(maxlens[index], l); + } + /* compute total table size: size of first table plus all secondary tables for symbols longer than FIRSTBITS */ + size = headsize; + for(i = 0; i < headsize; ++i) { + unsigned l = maxlens[i]; + if(l > FIRSTBITS) size += (1u << (l - FIRSTBITS)); + } + tree->table_len = (unsigned char*)lodepng_malloc(size * sizeof(*tree->table_len)); + tree->table_value = (unsigned short*)lodepng_malloc(size * sizeof(*tree->table_value)); + if(!tree->table_len || !tree->table_value) { + lodepng_free(maxlens); + /* freeing tree->table values is done at a higher scope */ + return 83; /*alloc fail*/ + } + /*initialize with an invalid length to indicate unused entries*/ + for(i = 0; i < size; ++i) tree->table_len[i] = 16; + + /*fill in the first table for long symbols: max prefix size and pointer to secondary tables*/ + pointer = headsize; + for(i = 0; i < headsize; ++i) { + unsigned l = maxlens[i]; + if(l <= FIRSTBITS) continue; + tree->table_len[i] = l; + tree->table_value[i] = pointer; + pointer += (1u << (l - FIRSTBITS)); + } + lodepng_free(maxlens); + + /*fill in the first table for short symbols, or secondary table for long symbols*/ + numpresent = 0; + for(i = 0; i < tree->numcodes; ++i) { + unsigned l = tree->lengths[i]; + unsigned symbol, reverse; + if(l == 0) continue; + symbol = tree->codes[i]; /*the huffman bit pattern. i itself is the value.*/ + /*reverse bits, because the huffman bits are given in MSB first order but the bit reader reads LSB first*/ + reverse = reverseBits(symbol, l); + numpresent++; + + if(l <= FIRSTBITS) { + /*short symbol, fully in first table, replicated num times if l < FIRSTBITS*/ + unsigned num = 1u << (FIRSTBITS - l); + unsigned j; + for(j = 0; j < num; ++j) { + /*bit reader will read the l bits of symbol first, the remaining FIRSTBITS - l bits go to the MSB's*/ + unsigned index = reverse | (j << l); + if(tree->table_len[index] != 16) return 55; /*invalid tree: long symbol shares prefix with short symbol*/ + tree->table_len[index] = l; + tree->table_value[index] = i; + } + } else { + /*long symbol, shares prefix with other long symbols in first lookup table, needs second lookup*/ + /*the FIRSTBITS MSBs of the symbol are the first table index*/ + unsigned index = reverse & mask; + unsigned maxlen = tree->table_len[index]; + /*log2 of secondary table length, should be >= l - FIRSTBITS*/ + unsigned tablelen = maxlen - FIRSTBITS; + unsigned start = tree->table_value[index]; /*starting index in secondary table*/ + unsigned num = 1u << (tablelen - (l - FIRSTBITS)); /*amount of entries of this symbol in secondary table*/ + unsigned j; + if(maxlen < l) return 55; /*invalid tree: long symbol shares prefix with short symbol*/ + for(j = 0; j < num; ++j) { + unsigned reverse2 = reverse >> FIRSTBITS; /* l - FIRSTBITS bits */ + unsigned index2 = start + (reverse2 | (j << (l - FIRSTBITS))); + tree->table_len[index2] = l; + tree->table_value[index2] = i; + } + } + } + + if(numpresent < 2) { + /* In case of exactly 1 symbol, in theory the huffman symbol needs 0 bits, + but deflate uses 1 bit instead. In case of 0 symbols, no symbols can + appear at all, but such huffman tree could still exist (e.g. if distance + codes are never used). In both cases, not all symbols of the table will be + filled in. Fill them in with an invalid symbol value so returning them from + huffmanDecodeSymbol will cause error. */ + for(i = 0; i < size; ++i) { + if(tree->table_len[i] == 16) { + /* As length, use a value smaller than FIRSTBITS for the head table, + and a value larger than FIRSTBITS for the secondary table, to ensure + valid behavior for advanceBits when reading this symbol. */ + tree->table_len[i] = (i < headsize) ? 1 : (FIRSTBITS + 1); + tree->table_value[i] = INVALIDSYMBOL; + } + } + } else { + /* A good huffman tree has N * 2 - 1 nodes, of which N - 1 are internal nodes. + If that is not the case (due to too long length codes), the table will not + have been fully used, and this is an error (not all bit combinations can be + decoded): an oversubscribed huffman tree, indicated by error 55. */ + for(i = 0; i < size; ++i) { + if(tree->table_len[i] == 16) return 55; + } + } + + return 0; +} + +/* +Second step for the ...makeFromLengths and ...makeFromFrequencies functions. +numcodes, lengths and maxbitlen must already be filled in correctly. return +value is error. +*/ +static unsigned HuffmanTree_makeFromLengths2(HuffmanTree* tree) { + unsigned* blcount; + unsigned* nextcode; + unsigned error = 0; + unsigned bits, n; + + tree->codes = (unsigned*)lodepng_malloc(tree->numcodes * sizeof(unsigned)); + blcount = (unsigned*)lodepng_malloc((tree->maxbitlen + 1) * sizeof(unsigned)); + nextcode = (unsigned*)lodepng_malloc((tree->maxbitlen + 1) * sizeof(unsigned)); + if(!tree->codes || !blcount || !nextcode) error = 83; /*alloc fail*/ + + if(!error) { + for(n = 0; n != tree->maxbitlen + 1; n++) blcount[n] = nextcode[n] = 0; + /*step 1: count number of instances of each code length*/ + for(bits = 0; bits != tree->numcodes; ++bits) ++blcount[tree->lengths[bits]]; + /*step 2: generate the nextcode values*/ + for(bits = 1; bits <= tree->maxbitlen; ++bits) { + nextcode[bits] = (nextcode[bits - 1] + blcount[bits - 1]) << 1u; + } + /*step 3: generate all the codes*/ + for(n = 0; n != tree->numcodes; ++n) { + if(tree->lengths[n] != 0) { + tree->codes[n] = nextcode[tree->lengths[n]]++; + /*remove superfluous bits from the code*/ + tree->codes[n] &= ((1u << tree->lengths[n]) - 1u); + } + } + } + + lodepng_free(blcount); + lodepng_free(nextcode); + + if(!error) error = HuffmanTree_makeTable(tree); + return error; +} + +/* +given the code lengths (as stored in the PNG file), generate the tree as defined +by Deflate. maxbitlen is the maximum bits that a code in the tree can have. +return value is error. +*/ +static unsigned HuffmanTree_makeFromLengths(HuffmanTree* tree, const unsigned* bitlen, + size_t numcodes, unsigned maxbitlen) { + unsigned i; + tree->lengths = (unsigned*)lodepng_malloc(numcodes * sizeof(unsigned)); + if(!tree->lengths) return 83; /*alloc fail*/ + for(i = 0; i != numcodes; ++i) tree->lengths[i] = bitlen[i]; + tree->numcodes = (unsigned)numcodes; /*number of symbols*/ + tree->maxbitlen = maxbitlen; + return HuffmanTree_makeFromLengths2(tree); +} + +#ifdef LODEPNG_COMPILE_ENCODER + +/*BPM: Boundary Package Merge, see "A Fast and Space-Economical Algorithm for Length-Limited Coding", +Jyrki Katajainen, Alistair Moffat, Andrew Turpin, 1995.*/ + +/*chain node for boundary package merge*/ +typedef struct BPMNode { + int weight; /*the sum of all weights in this chain*/ + unsigned index; /*index of this leaf node (called "count" in the paper)*/ + struct BPMNode* tail; /*the next nodes in this chain (null if last)*/ + int in_use; +} BPMNode; + +/*lists of chains*/ +typedef struct BPMLists { + /*memory pool*/ + unsigned memsize; + BPMNode* memory; + unsigned numfree; + unsigned nextfree; + BPMNode** freelist; + /*two heads of lookahead chains per list*/ + unsigned listsize; + BPMNode** chains0; + BPMNode** chains1; +} BPMLists; + +/*creates a new chain node with the given parameters, from the memory in the lists */ +static BPMNode* bpmnode_create(BPMLists* lists, int weight, unsigned index, BPMNode* tail) { + unsigned i; + BPMNode* result; + + /*memory full, so garbage collect*/ + if(lists->nextfree >= lists->numfree) { + /*mark only those that are in use*/ + for(i = 0; i != lists->memsize; ++i) lists->memory[i].in_use = 0; + for(i = 0; i != lists->listsize; ++i) { + BPMNode* node; + for(node = lists->chains0[i]; node != 0; node = node->tail) node->in_use = 1; + for(node = lists->chains1[i]; node != 0; node = node->tail) node->in_use = 1; + } + /*collect those that are free*/ + lists->numfree = 0; + for(i = 0; i != lists->memsize; ++i) { + if(!lists->memory[i].in_use) lists->freelist[lists->numfree++] = &lists->memory[i]; + } + lists->nextfree = 0; + } + + result = lists->freelist[lists->nextfree++]; + result->weight = weight; + result->index = index; + result->tail = tail; + return result; +} + +/*sort the leaves with stable mergesort*/ +static void bpmnode_sort(BPMNode* leaves, size_t num) { + BPMNode* mem = (BPMNode*)lodepng_malloc(sizeof(*leaves) * num); + size_t width, counter = 0; + for(width = 1; width < num; width *= 2) { + BPMNode* a = (counter & 1) ? mem : leaves; + BPMNode* b = (counter & 1) ? leaves : mem; + size_t p; + for(p = 0; p < num; p += 2 * width) { + size_t q = (p + width > num) ? num : (p + width); + size_t r = (p + 2 * width > num) ? num : (p + 2 * width); + size_t i = p, j = q, k; + for(k = p; k < r; k++) { + if(i < q && (j >= r || a[i].weight <= a[j].weight)) b[k] = a[i++]; + else b[k] = a[j++]; + } + } + counter++; + } + if(counter & 1) lodepng_memcpy(leaves, mem, sizeof(*leaves) * num); + lodepng_free(mem); +} + +/*Boundary Package Merge step, numpresent is the amount of leaves, and c is the current chain.*/ +static void boundaryPM(BPMLists* lists, BPMNode* leaves, size_t numpresent, int c, int num) { + unsigned lastindex = lists->chains1[c]->index; + + if(c == 0) { + if(lastindex >= numpresent) return; + lists->chains0[c] = lists->chains1[c]; + lists->chains1[c] = bpmnode_create(lists, leaves[lastindex].weight, lastindex + 1, 0); + } else { + /*sum of the weights of the head nodes of the previous lookahead chains.*/ + int sum = lists->chains0[c - 1]->weight + lists->chains1[c - 1]->weight; + lists->chains0[c] = lists->chains1[c]; + if(lastindex < numpresent && sum > leaves[lastindex].weight) { + lists->chains1[c] = bpmnode_create(lists, leaves[lastindex].weight, lastindex + 1, lists->chains1[c]->tail); + return; + } + lists->chains1[c] = bpmnode_create(lists, sum, lastindex, lists->chains1[c - 1]); + /*in the end we are only interested in the chain of the last list, so no + need to recurse if we're at the last one (this gives measurable speedup)*/ + if(num + 1 < (int)(2 * numpresent - 2)) { + boundaryPM(lists, leaves, numpresent, c - 1, num); + boundaryPM(lists, leaves, numpresent, c - 1, num); + } + } +} + +unsigned lodepng_huffman_code_lengths(unsigned* lengths, const unsigned* frequencies, + size_t numcodes, unsigned maxbitlen) { + unsigned error = 0; + unsigned i; + size_t numpresent = 0; /*number of symbols with non-zero frequency*/ + BPMNode* leaves; /*the symbols, only those with > 0 frequency*/ + + if(numcodes == 0) return 80; /*error: a tree of 0 symbols is not supposed to be made*/ + if((1u << maxbitlen) < (unsigned)numcodes) return 80; /*error: represent all symbols*/ + + leaves = (BPMNode*)lodepng_malloc(numcodes * sizeof(*leaves)); + if(!leaves) return 83; /*alloc fail*/ + + for(i = 0; i != numcodes; ++i) { + if(frequencies[i] > 0) { + leaves[numpresent].weight = (int)frequencies[i]; + leaves[numpresent].index = i; + ++numpresent; + } + } + + lodepng_memset(lengths, 0, numcodes * sizeof(*lengths)); + + /*ensure at least two present symbols. There should be at least one symbol + according to RFC 1951 section 3.2.7. Some decoders incorrectly require two. To + make these work as well ensure there are at least two symbols. The + Package-Merge code below also doesn't work correctly if there's only one + symbol, it'd give it the theoretical 0 bits but in practice zlib wants 1 bit*/ + if(numpresent == 0) { + lengths[0] = lengths[1] = 1; /*note that for RFC 1951 section 3.2.7, only lengths[0] = 1 is needed*/ + } else if(numpresent == 1) { + lengths[leaves[0].index] = 1; + lengths[leaves[0].index == 0 ? 1 : 0] = 1; + } else { + BPMLists lists; + BPMNode* node; + + bpmnode_sort(leaves, numpresent); + + lists.listsize = maxbitlen; + lists.memsize = 2 * maxbitlen * (maxbitlen + 1); + lists.nextfree = 0; + lists.numfree = lists.memsize; + lists.memory = (BPMNode*)lodepng_malloc(lists.memsize * sizeof(*lists.memory)); + lists.freelist = (BPMNode**)lodepng_malloc(lists.memsize * sizeof(BPMNode*)); + lists.chains0 = (BPMNode**)lodepng_malloc(lists.listsize * sizeof(BPMNode*)); + lists.chains1 = (BPMNode**)lodepng_malloc(lists.listsize * sizeof(BPMNode*)); + if(!lists.memory || !lists.freelist || !lists.chains0 || !lists.chains1) error = 83; /*alloc fail*/ + + if(!error) { + for(i = 0; i != lists.memsize; ++i) lists.freelist[i] = &lists.memory[i]; + + bpmnode_create(&lists, leaves[0].weight, 1, 0); + bpmnode_create(&lists, leaves[1].weight, 2, 0); + + for(i = 0; i != lists.listsize; ++i) { + lists.chains0[i] = &lists.memory[0]; + lists.chains1[i] = &lists.memory[1]; + } + + /*each boundaryPM call adds one chain to the last list, and we need 2 * numpresent - 2 chains.*/ + for(i = 2; i != 2 * numpresent - 2; ++i) boundaryPM(&lists, leaves, numpresent, (int)maxbitlen - 1, (int)i); + + for(node = lists.chains1[maxbitlen - 1]; node; node = node->tail) { + for(i = 0; i != node->index; ++i) ++lengths[leaves[i].index]; + } + } + + lodepng_free(lists.memory); + lodepng_free(lists.freelist); + lodepng_free(lists.chains0); + lodepng_free(lists.chains1); + } + + lodepng_free(leaves); + return error; +} + +/*Create the Huffman tree given the symbol frequencies*/ +static unsigned HuffmanTree_makeFromFrequencies(HuffmanTree* tree, const unsigned* frequencies, + size_t mincodes, size_t numcodes, unsigned maxbitlen) { + unsigned error = 0; + while(!frequencies[numcodes - 1] && numcodes > mincodes) --numcodes; /*trim zeroes*/ + tree->lengths = (unsigned*)lodepng_malloc(numcodes * sizeof(unsigned)); + if(!tree->lengths) return 83; /*alloc fail*/ + tree->maxbitlen = maxbitlen; + tree->numcodes = (unsigned)numcodes; /*number of symbols*/ + + error = lodepng_huffman_code_lengths(tree->lengths, frequencies, numcodes, maxbitlen); + if(!error) error = HuffmanTree_makeFromLengths2(tree); + return error; +} +#endif /*LODEPNG_COMPILE_ENCODER*/ + +/*get the literal and length code tree of a deflated block with fixed tree, as per the deflate specification*/ +static unsigned generateFixedLitLenTree(HuffmanTree* tree) { + unsigned i, error = 0; + unsigned* bitlen = (unsigned*)lodepng_malloc(NUM_DEFLATE_CODE_SYMBOLS * sizeof(unsigned)); + if(!bitlen) return 83; /*alloc fail*/ + + /*288 possible codes: 0-255=literals, 256=endcode, 257-285=lengthcodes, 286-287=unused*/ + for(i = 0; i <= 143; ++i) bitlen[i] = 8; + for(i = 144; i <= 255; ++i) bitlen[i] = 9; + for(i = 256; i <= 279; ++i) bitlen[i] = 7; + for(i = 280; i <= 287; ++i) bitlen[i] = 8; + + error = HuffmanTree_makeFromLengths(tree, bitlen, NUM_DEFLATE_CODE_SYMBOLS, 15); + + lodepng_free(bitlen); + return error; +} + +/*get the distance code tree of a deflated block with fixed tree, as specified in the deflate specification*/ +static unsigned generateFixedDistanceTree(HuffmanTree* tree) { + unsigned i, error = 0; + unsigned* bitlen = (unsigned*)lodepng_malloc(NUM_DISTANCE_SYMBOLS * sizeof(unsigned)); + if(!bitlen) return 83; /*alloc fail*/ + + /*there are 32 distance codes, but 30-31 are unused*/ + for(i = 0; i != NUM_DISTANCE_SYMBOLS; ++i) bitlen[i] = 5; + error = HuffmanTree_makeFromLengths(tree, bitlen, NUM_DISTANCE_SYMBOLS, 15); + + lodepng_free(bitlen); + return error; +} + +#ifdef LODEPNG_COMPILE_DECODER + +/* +returns the code. The bit reader must already have been ensured at least 15 bits +*/ +static unsigned huffmanDecodeSymbol(LodePNGBitReader* reader, const HuffmanTree* codetree) { + unsigned short code = peekBits(reader, FIRSTBITS); + unsigned short l = codetree->table_len[code]; + unsigned short value = codetree->table_value[code]; + if(l <= FIRSTBITS) { + advanceBits(reader, l); + return value; + } else { + advanceBits(reader, FIRSTBITS); + value += peekBits(reader, l - FIRSTBITS); + advanceBits(reader, codetree->table_len[value] - FIRSTBITS); + return codetree->table_value[value]; + } +} +#endif /*LODEPNG_COMPILE_DECODER*/ + +#ifdef LODEPNG_COMPILE_DECODER + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / Inflator (Decompressor) / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +/*get the tree of a deflated block with fixed tree, as specified in the deflate specification +Returns error code.*/ +static unsigned getTreeInflateFixed(HuffmanTree* tree_ll, HuffmanTree* tree_d) { + unsigned error = generateFixedLitLenTree(tree_ll); + if(error) return error; + return generateFixedDistanceTree(tree_d); +} + +/*get the tree of a deflated block with dynamic tree, the tree itself is also Huffman compressed with a known tree*/ +static unsigned getTreeInflateDynamic(HuffmanTree* tree_ll, HuffmanTree* tree_d, + LodePNGBitReader* reader) { + /*make sure that length values that aren't filled in will be 0, or a wrong tree will be generated*/ + unsigned error = 0; + unsigned n, HLIT, HDIST, HCLEN, i; + + /*see comments in deflateDynamic for explanation of the context and these variables, it is analogous*/ + unsigned* bitlen_ll = 0; /*lit,len code lengths*/ + unsigned* bitlen_d = 0; /*dist code lengths*/ + /*code length code lengths ("clcl"), the bit lengths of the huffman tree used to compress bitlen_ll and bitlen_d*/ + unsigned* bitlen_cl = 0; + HuffmanTree tree_cl; /*the code tree for code length codes (the huffman tree for compressed huffman trees)*/ + + if(reader->bitsize - reader->bp < 14) return 49; /*error: the bit pointer is or will go past the memory*/ + ensureBits17(reader, 14); + + /*number of literal/length codes + 257. Unlike the spec, the value 257 is added to it here already*/ + HLIT = readBits(reader, 5) + 257; + /*number of distance codes. Unlike the spec, the value 1 is added to it here already*/ + HDIST = readBits(reader, 5) + 1; + /*number of code length codes. Unlike the spec, the value 4 is added to it here already*/ + HCLEN = readBits(reader, 4) + 4; + + bitlen_cl = (unsigned*)lodepng_malloc(NUM_CODE_LENGTH_CODES * sizeof(unsigned)); + if(!bitlen_cl) return 83 /*alloc fail*/; + + HuffmanTree_init(&tree_cl); + + while(!error) { + /*read the code length codes out of 3 * (amount of code length codes) bits*/ + if(lodepng_gtofl(reader->bp, HCLEN * 3, reader->bitsize)) { + ERROR_BREAK(50); /*error: the bit pointer is or will go past the memory*/ + } + for(i = 0; i != HCLEN; ++i) { + ensureBits9(reader, 3); /*out of bounds already checked above */ + bitlen_cl[CLCL_ORDER[i]] = readBits(reader, 3); + } + for(i = HCLEN; i != NUM_CODE_LENGTH_CODES; ++i) { + bitlen_cl[CLCL_ORDER[i]] = 0; + } + + error = HuffmanTree_makeFromLengths(&tree_cl, bitlen_cl, NUM_CODE_LENGTH_CODES, 7); + if(error) break; + + /*now we can use this tree to read the lengths for the tree that this function will return*/ + bitlen_ll = (unsigned*)lodepng_malloc(NUM_DEFLATE_CODE_SYMBOLS * sizeof(unsigned)); + bitlen_d = (unsigned*)lodepng_malloc(NUM_DISTANCE_SYMBOLS * sizeof(unsigned)); + if(!bitlen_ll || !bitlen_d) ERROR_BREAK(83 /*alloc fail*/); + lodepng_memset(bitlen_ll, 0, NUM_DEFLATE_CODE_SYMBOLS * sizeof(*bitlen_ll)); + lodepng_memset(bitlen_d, 0, NUM_DISTANCE_SYMBOLS * sizeof(*bitlen_d)); + + /*i is the current symbol we're reading in the part that contains the code lengths of lit/len and dist codes*/ + i = 0; + while(i < HLIT + HDIST) { + unsigned code; + ensureBits25(reader, 22); /* up to 15 bits for huffman code, up to 7 extra bits below*/ + code = huffmanDecodeSymbol(reader, &tree_cl); + if(code <= 15) /*a length code*/ { + if(i < HLIT) bitlen_ll[i] = code; + else bitlen_d[i - HLIT] = code; + ++i; + } else if(code == 16) /*repeat previous*/ { + unsigned replength = 3; /*read in the 2 bits that indicate repeat length (3-6)*/ + unsigned value; /*set value to the previous code*/ + + if(i == 0) ERROR_BREAK(54); /*can't repeat previous if i is 0*/ + + replength += readBits(reader, 2); + + if(i < HLIT + 1) value = bitlen_ll[i - 1]; + else value = bitlen_d[i - HLIT - 1]; + /*repeat this value in the next lengths*/ + for(n = 0; n < replength; ++n) { + if(i >= HLIT + HDIST) ERROR_BREAK(13); /*error: i is larger than the amount of codes*/ + if(i < HLIT) bitlen_ll[i] = value; + else bitlen_d[i - HLIT] = value; + ++i; + } + } else if(code == 17) /*repeat "0" 3-10 times*/ { + unsigned replength = 3; /*read in the bits that indicate repeat length*/ + replength += readBits(reader, 3); + + /*repeat this value in the next lengths*/ + for(n = 0; n < replength; ++n) { + if(i >= HLIT + HDIST) ERROR_BREAK(14); /*error: i is larger than the amount of codes*/ + + if(i < HLIT) bitlen_ll[i] = 0; + else bitlen_d[i - HLIT] = 0; + ++i; + } + } else if(code == 18) /*repeat "0" 11-138 times*/ { + unsigned replength = 11; /*read in the bits that indicate repeat length*/ + replength += readBits(reader, 7); + + /*repeat this value in the next lengths*/ + for(n = 0; n < replength; ++n) { + if(i >= HLIT + HDIST) ERROR_BREAK(15); /*error: i is larger than the amount of codes*/ + + if(i < HLIT) bitlen_ll[i] = 0; + else bitlen_d[i - HLIT] = 0; + ++i; + } + } else /*if(code == INVALIDSYMBOL)*/ { + ERROR_BREAK(16); /*error: tried to read disallowed huffman symbol*/ + } + /*check if any of the ensureBits above went out of bounds*/ + if(reader->bp > reader->bitsize) { + /*return error code 10 or 11 depending on the situation that happened in huffmanDecodeSymbol + (10=no endcode, 11=wrong jump outside of tree)*/ + /* TODO: revise error codes 10,11,50: the above comment is no longer valid */ + ERROR_BREAK(50); /*error, bit pointer jumps past memory*/ + } + } + if(error) break; + + if(bitlen_ll[256] == 0) ERROR_BREAK(64); /*the length of the end code 256 must be larger than 0*/ + + /*now we've finally got HLIT and HDIST, so generate the code trees, and the function is done*/ + error = HuffmanTree_makeFromLengths(tree_ll, bitlen_ll, NUM_DEFLATE_CODE_SYMBOLS, 15); + if(error) break; + error = HuffmanTree_makeFromLengths(tree_d, bitlen_d, NUM_DISTANCE_SYMBOLS, 15); + + break; /*end of error-while*/ + } + + lodepng_free(bitlen_cl); + lodepng_free(bitlen_ll); + lodepng_free(bitlen_d); + HuffmanTree_cleanup(&tree_cl); + + return error; +} + +/*inflate a block with dynamic of fixed Huffman tree. btype must be 1 or 2.*/ +static unsigned inflateHuffmanBlock(ucvector* out, LodePNGBitReader* reader, + unsigned btype, size_t max_output_size) { + unsigned error = 0; + HuffmanTree tree_ll; /*the huffman tree for literal and length codes*/ + HuffmanTree tree_d; /*the huffman tree for distance codes*/ + const size_t reserved_size = 260; /* must be at least 258 for max length, and a few extra for adding a few extra literals */ + int done = 0; + + if(!ucvector_reserve(out, out->size + reserved_size)) return 83; /*alloc fail*/ + + HuffmanTree_init(&tree_ll); + HuffmanTree_init(&tree_d); + + if(btype == 1) error = getTreeInflateFixed(&tree_ll, &tree_d); + else /*if(btype == 2)*/ error = getTreeInflateDynamic(&tree_ll, &tree_d, reader); + + + while(!error && !done) /*decode all symbols until end reached, breaks at end code*/ { + /*code_ll is literal, length or end code*/ + unsigned code_ll; + /* ensure enough bits for 2 huffman code reads (15 bits each): if the first is a literal, a second literal is read at once. This + appears to be slightly faster, than ensuring 20 bits here for 1 huffman symbol and the potential 5 extra bits for the length symbol.*/ + ensureBits32(reader, 30); + code_ll = huffmanDecodeSymbol(reader, &tree_ll); + if(code_ll <= 255) { + /*slightly faster code path if multiple literals in a row*/ + out->data[out->size++] = (unsigned char)code_ll; + code_ll = huffmanDecodeSymbol(reader, &tree_ll); + } + if(code_ll <= 255) /*literal symbol*/ { + out->data[out->size++] = (unsigned char)code_ll; + } else if(code_ll >= FIRST_LENGTH_CODE_INDEX && code_ll <= LAST_LENGTH_CODE_INDEX) /*length code*/ { + unsigned code_d, distance; + unsigned numextrabits_l, numextrabits_d; /*extra bits for length and distance*/ + size_t start, backward, length; + + /*part 1: get length base*/ + length = LENGTHBASE[code_ll - FIRST_LENGTH_CODE_INDEX]; + + /*part 2: get extra bits and add the value of that to length*/ + numextrabits_l = LENGTHEXTRA[code_ll - FIRST_LENGTH_CODE_INDEX]; + if(numextrabits_l != 0) { + /* bits already ensured above */ + ensureBits25(reader, 5); + length += readBits(reader, numextrabits_l); + } + + /*part 3: get distance code*/ + ensureBits32(reader, 28); /* up to 15 for the huffman symbol, up to 13 for the extra bits */ + code_d = huffmanDecodeSymbol(reader, &tree_d); + if(code_d > 29) { + if(code_d <= 31) { + ERROR_BREAK(18); /*error: invalid distance code (30-31 are never used)*/ + } else /* if(code_d == INVALIDSYMBOL) */{ + ERROR_BREAK(16); /*error: tried to read disallowed huffman symbol*/ + } + } + distance = DISTANCEBASE[code_d]; + + /*part 4: get extra bits from distance*/ + numextrabits_d = DISTANCEEXTRA[code_d]; + if(numextrabits_d != 0) { + /* bits already ensured above */ + distance += readBits(reader, numextrabits_d); + } + + /*part 5: fill in all the out[n] values based on the length and dist*/ + start = out->size; + if(distance > start) ERROR_BREAK(52); /*too long backward distance*/ + backward = start - distance; + + out->size += length; + if(distance < length) { + size_t forward; + lodepng_memcpy(out->data + start, out->data + backward, distance); + start += distance; + for(forward = distance; forward < length; ++forward) { + out->data[start++] = out->data[backward++]; + } + } else { + lodepng_memcpy(out->data + start, out->data + backward, length); + } + } else if(code_ll == 256) { + done = 1; /*end code, finish the loop*/ + } else /*if(code_ll == INVALIDSYMBOL)*/ { + ERROR_BREAK(16); /*error: tried to read disallowed huffman symbol*/ + } + if(out->allocsize - out->size < reserved_size) { + if(!ucvector_reserve(out, out->size + reserved_size)) ERROR_BREAK(83); /*alloc fail*/ + } + /*check if any of the ensureBits above went out of bounds*/ + if(reader->bp > reader->bitsize) { + /*return error code 10 or 11 depending on the situation that happened in huffmanDecodeSymbol + (10=no endcode, 11=wrong jump outside of tree)*/ + /* TODO: revise error codes 10,11,50: the above comment is no longer valid */ + ERROR_BREAK(51); /*error, bit pointer jumps past memory*/ + } + if(max_output_size && out->size > max_output_size) { + ERROR_BREAK(109); /*error, larger than max size*/ + } + } + + HuffmanTree_cleanup(&tree_ll); + HuffmanTree_cleanup(&tree_d); + + return error; +} + +static unsigned inflateNoCompression(ucvector* out, LodePNGBitReader* reader, + const LodePNGDecompressSettings* settings) { + size_t bytepos; + size_t size = reader->size; + unsigned LEN, NLEN, error = 0; + + /*go to first boundary of byte*/ + bytepos = (reader->bp + 7u) >> 3u; + + /*read LEN (2 bytes) and NLEN (2 bytes)*/ + if(bytepos + 4 >= size) return 52; /*error, bit pointer will jump past memory*/ + LEN = (unsigned)reader->data[bytepos] + ((unsigned)reader->data[bytepos + 1] << 8u); bytepos += 2; + NLEN = (unsigned)reader->data[bytepos] + ((unsigned)reader->data[bytepos + 1] << 8u); bytepos += 2; + + /*check if 16-bit NLEN is really the one's complement of LEN*/ + if(!settings->ignore_nlen && LEN + NLEN != 65535) { + return 21; /*error: NLEN is not one's complement of LEN*/ + } + + if(!ucvector_resize(out, out->size + LEN)) return 83; /*alloc fail*/ + + /*read the literal data: LEN bytes are now stored in the out buffer*/ + if(bytepos + LEN > size) return 23; /*error: reading outside of in buffer*/ + + /*out->data can be NULL (when LEN is zero), and arithmetics on NULL ptr is undefined*/ + if (LEN) { + lodepng_memcpy(out->data + out->size - LEN, reader->data + bytepos, LEN); + bytepos += LEN; + } + + reader->bp = bytepos << 3u; + + return error; +} + +static unsigned lodepng_inflatev(ucvector* out, + const unsigned char* in, size_t insize, + const LodePNGDecompressSettings* settings) { + unsigned BFINAL = 0; + LodePNGBitReader reader; + unsigned error = LodePNGBitReader_init(&reader, in, insize); + + if(error) return error; + + while(!BFINAL) { + unsigned BTYPE; + if(reader.bitsize - reader.bp < 3) return 52; /*error, bit pointer will jump past memory*/ + ensureBits9(&reader, 3); + BFINAL = readBits(&reader, 1); + BTYPE = readBits(&reader, 2); + + if(BTYPE == 3) return 20; /*error: invalid BTYPE*/ + else if(BTYPE == 0) error = inflateNoCompression(out, &reader, settings); /*no compression*/ + else error = inflateHuffmanBlock(out, &reader, BTYPE, settings->max_output_size); /*compression, BTYPE 01 or 10*/ + if(!error && settings->max_output_size && out->size > settings->max_output_size) error = 109; + if(error) break; + } + + return error; +} + +unsigned lodepng_inflate(unsigned char** out, size_t* outsize, + const unsigned char* in, size_t insize, + const LodePNGDecompressSettings* settings) { + ucvector v = ucvector_init(*out, *outsize); + unsigned error = lodepng_inflatev(&v, in, insize, settings); + *out = v.data; + *outsize = v.size; + return error; +} + +static unsigned inflatev(ucvector* out, const unsigned char* in, size_t insize, + const LodePNGDecompressSettings* settings) { + if(settings->custom_inflate) { + unsigned error = settings->custom_inflate(&out->data, &out->size, in, insize, settings); + out->allocsize = out->size; + if(error) { + /*the custom inflate is allowed to have its own error codes, however, we translate it to code 110*/ + error = 110; + /*if there's a max output size, and the custom zlib returned error, then indicate that error instead*/ + if(settings->max_output_size && out->size > settings->max_output_size) error = 109; + } + return error; + } else { + return lodepng_inflatev(out, in, insize, settings); + } +} + +#endif /*LODEPNG_COMPILE_DECODER*/ + +#ifdef LODEPNG_COMPILE_ENCODER + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / Deflator (Compressor) / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +static const size_t MAX_SUPPORTED_DEFLATE_LENGTH = 258; + +/*search the index in the array, that has the largest value smaller than or equal to the given value, +given array must be sorted (if no value is smaller, it returns the size of the given array)*/ +static size_t searchCodeIndex(const unsigned* array, size_t array_size, size_t value) { + /*binary search (only small gain over linear). TODO: use CPU log2 instruction for getting symbols instead*/ + size_t left = 1; + size_t right = array_size - 1; + + while(left <= right) { + size_t mid = (left + right) >> 1; + if(array[mid] >= value) right = mid - 1; + else left = mid + 1; + } + if(left >= array_size || array[left] > value) left--; + return left; +} + +static void addLengthDistance(uivector* values, size_t length, size_t distance) { + /*values in encoded vector are those used by deflate: + 0-255: literal bytes + 256: end + 257-285: length/distance pair (length code, followed by extra length bits, distance code, extra distance bits) + 286-287: invalid*/ + + unsigned length_code = (unsigned)searchCodeIndex(LENGTHBASE, 29, length); + unsigned extra_length = (unsigned)(length - LENGTHBASE[length_code]); + unsigned dist_code = (unsigned)searchCodeIndex(DISTANCEBASE, 30, distance); + unsigned extra_distance = (unsigned)(distance - DISTANCEBASE[dist_code]); + + size_t pos = values->size; + /*TODO: return error when this fails (out of memory)*/ + unsigned ok = uivector_resize(values, values->size + 4); + if(ok) { + values->data[pos + 0] = length_code + FIRST_LENGTH_CODE_INDEX; + values->data[pos + 1] = extra_length; + values->data[pos + 2] = dist_code; + values->data[pos + 3] = extra_distance; + } +} + +/*3 bytes of data get encoded into two bytes. The hash cannot use more than 3 +bytes as input because 3 is the minimum match length for deflate*/ +static const unsigned HASH_NUM_VALUES = 65536; +static const unsigned HASH_BIT_MASK = 65535; /*HASH_NUM_VALUES - 1, but C90 does not like that as initializer*/ + +typedef struct Hash { + int* head; /*hash value to head circular pos - can be outdated if went around window*/ + /*circular pos to prev circular pos*/ + unsigned short* chain; + int* val; /*circular pos to hash value*/ + + /*TODO: do this not only for zeros but for any repeated byte. However for PNG + it's always going to be the zeros that dominate, so not important for PNG*/ + int* headz; /*similar to head, but for chainz*/ + unsigned short* chainz; /*those with same amount of zeros*/ + unsigned short* zeros; /*length of zeros streak, used as a second hash chain*/ +} Hash; + +static unsigned hash_init(Hash* hash, unsigned windowsize) { + unsigned i; + hash->head = (int*)lodepng_malloc(sizeof(int) * HASH_NUM_VALUES); + hash->val = (int*)lodepng_malloc(sizeof(int) * windowsize); + hash->chain = (unsigned short*)lodepng_malloc(sizeof(unsigned short) * windowsize); + + hash->zeros = (unsigned short*)lodepng_malloc(sizeof(unsigned short) * windowsize); + hash->headz = (int*)lodepng_malloc(sizeof(int) * (MAX_SUPPORTED_DEFLATE_LENGTH + 1)); + hash->chainz = (unsigned short*)lodepng_malloc(sizeof(unsigned short) * windowsize); + + if(!hash->head || !hash->chain || !hash->val || !hash->headz|| !hash->chainz || !hash->zeros) { + return 83; /*alloc fail*/ + } + + /*initialize hash table*/ + for(i = 0; i != HASH_NUM_VALUES; ++i) hash->head[i] = -1; + for(i = 0; i != windowsize; ++i) hash->val[i] = -1; + for(i = 0; i != windowsize; ++i) hash->chain[i] = i; /*same value as index indicates uninitialized*/ + + for(i = 0; i <= MAX_SUPPORTED_DEFLATE_LENGTH; ++i) hash->headz[i] = -1; + for(i = 0; i != windowsize; ++i) hash->chainz[i] = i; /*same value as index indicates uninitialized*/ + + return 0; +} + +static void hash_cleanup(Hash* hash) { + lodepng_free(hash->head); + lodepng_free(hash->val); + lodepng_free(hash->chain); + + lodepng_free(hash->zeros); + lodepng_free(hash->headz); + lodepng_free(hash->chainz); +} + + + +static unsigned getHash(const unsigned char* data, size_t size, size_t pos) { + unsigned result = 0; + if(pos + 2 < size) { + /*A simple shift and xor hash is used. Since the data of PNGs is dominated + by zeroes due to the filters, a better hash does not have a significant + effect on speed in traversing the chain, and causes more time spend on + calculating the hash.*/ + result ^= ((unsigned)data[pos + 0] << 0u); + result ^= ((unsigned)data[pos + 1] << 4u); + result ^= ((unsigned)data[pos + 2] << 8u); + } else { + size_t amount, i; + if(pos >= size) return 0; + amount = size - pos; + for(i = 0; i != amount; ++i) result ^= ((unsigned)data[pos + i] << (i * 8u)); + } + return result & HASH_BIT_MASK; +} + +static unsigned countZeros(const unsigned char* data, size_t size, size_t pos) { + const unsigned char* start = data + pos; + const unsigned char* end = start + MAX_SUPPORTED_DEFLATE_LENGTH; + if(end > data + size) end = data + size; + data = start; + while(data != end && *data == 0) ++data; + /*subtracting two addresses returned as 32-bit number (max value is MAX_SUPPORTED_DEFLATE_LENGTH)*/ + return (unsigned)(data - start); +} + +/*wpos = pos & (windowsize - 1)*/ +static void updateHashChain(Hash* hash, size_t wpos, unsigned hashval, unsigned short numzeros) { + hash->val[wpos] = (int)hashval; + if(hash->head[hashval] != -1) hash->chain[wpos] = hash->head[hashval]; + hash->head[hashval] = (int)wpos; + + hash->zeros[wpos] = numzeros; + if(hash->headz[numzeros] != -1) hash->chainz[wpos] = hash->headz[numzeros]; + hash->headz[numzeros] = (int)wpos; +} + +/* +LZ77-encode the data. Return value is error code. The input are raw bytes, the output +is in the form of unsigned integers with codes representing for example literal bytes, or +length/distance pairs. +It uses a hash table technique to let it encode faster. When doing LZ77 encoding, a +sliding window (of windowsize) is used, and all past bytes in that window can be used as +the "dictionary". A brute force search through all possible distances would be slow, and +this hash technique is one out of several ways to speed this up. +*/ +static unsigned encodeLZ77(uivector* out, Hash* hash, + const unsigned char* in, size_t inpos, size_t insize, unsigned windowsize, + unsigned minmatch, unsigned nicematch, unsigned lazymatching) { + size_t pos; + unsigned i, error = 0; + /*for large window lengths, assume the user wants no compression loss. Otherwise, max hash chain length speedup.*/ + unsigned maxchainlength = windowsize >= 8192 ? windowsize : windowsize / 8u; + unsigned maxlazymatch = windowsize >= 8192 ? MAX_SUPPORTED_DEFLATE_LENGTH : 64; + + unsigned usezeros = 1; /*not sure if setting it to false for windowsize < 8192 is better or worse*/ + unsigned numzeros = 0; + + unsigned offset; /*the offset represents the distance in LZ77 terminology*/ + unsigned length; + unsigned lazy = 0; + unsigned lazylength = 0, lazyoffset = 0; + unsigned hashval; + unsigned current_offset, current_length; + unsigned prev_offset; + const unsigned char *lastptr, *foreptr, *backptr; + unsigned hashpos; + + if(windowsize == 0 || windowsize > 32768) return 60; /*error: windowsize smaller/larger than allowed*/ + if((windowsize & (windowsize - 1)) != 0) return 90; /*error: must be power of two*/ + + if(nicematch > MAX_SUPPORTED_DEFLATE_LENGTH) nicematch = MAX_SUPPORTED_DEFLATE_LENGTH; + + for(pos = inpos; pos < insize; ++pos) { + size_t wpos = pos & (windowsize - 1); /*position for in 'circular' hash buffers*/ + unsigned chainlength = 0; + + hashval = getHash(in, insize, pos); + + if(usezeros && hashval == 0) { + if(numzeros == 0) numzeros = countZeros(in, insize, pos); + else if(pos + numzeros > insize || in[pos + numzeros - 1] != 0) --numzeros; + } else { + numzeros = 0; + } + + updateHashChain(hash, wpos, hashval, numzeros); + + /*the length and offset found for the current position*/ + length = 0; + offset = 0; + + hashpos = hash->chain[wpos]; + + lastptr = &in[insize < pos + MAX_SUPPORTED_DEFLATE_LENGTH ? insize : pos + MAX_SUPPORTED_DEFLATE_LENGTH]; + + /*search for the longest string*/ + prev_offset = 0; + for(;;) { + if(chainlength++ >= maxchainlength) break; + current_offset = (unsigned)(hashpos <= wpos ? wpos - hashpos : wpos - hashpos + windowsize); + + if(current_offset < prev_offset) break; /*stop when went completely around the circular buffer*/ + prev_offset = current_offset; + if(current_offset > 0) { + /*test the next characters*/ + foreptr = &in[pos]; + backptr = &in[pos - current_offset]; + + /*common case in PNGs is lots of zeros. Quickly skip over them as a speedup*/ + if(numzeros >= 3) { + unsigned skip = hash->zeros[hashpos]; + if(skip > numzeros) skip = numzeros; + backptr += skip; + foreptr += skip; + } + + while(foreptr != lastptr && *backptr == *foreptr) /*maximum supported length by deflate is max length*/ { + ++backptr; + ++foreptr; + } + current_length = (unsigned)(foreptr - &in[pos]); + + if(current_length > length) { + length = current_length; /*the longest length*/ + offset = current_offset; /*the offset that is related to this longest length*/ + /*jump out once a length of max length is found (speed gain). This also jumps + out if length is MAX_SUPPORTED_DEFLATE_LENGTH*/ + if(current_length >= nicematch) break; + } + } + + if(hashpos == hash->chain[hashpos]) break; + + if(numzeros >= 3 && length > numzeros) { + hashpos = hash->chainz[hashpos]; + if(hash->zeros[hashpos] != numzeros) break; + } else { + hashpos = hash->chain[hashpos]; + /*outdated hash value, happens if particular value was not encountered in whole last window*/ + if(hash->val[hashpos] != (int)hashval) break; + } + } + + if(lazymatching) { + if(!lazy && length >= 3 && length <= maxlazymatch && length < MAX_SUPPORTED_DEFLATE_LENGTH) { + lazy = 1; + lazylength = length; + lazyoffset = offset; + continue; /*try the next byte*/ + } + if(lazy) { + lazy = 0; + if(pos == 0) ERROR_BREAK(81); + if(length > lazylength + 1) { + /*push the previous character as literal*/ + if(!uivector_push_back(out, in[pos - 1])) ERROR_BREAK(83 /*alloc fail*/); + } else { + length = lazylength; + offset = lazyoffset; + hash->head[hashval] = -1; /*the same hashchain update will be done, this ensures no wrong alteration*/ + hash->headz[numzeros] = -1; /*idem*/ + --pos; + } + } + } + if(length >= 3 && offset > windowsize) ERROR_BREAK(86 /*too big (or overflown negative) offset*/); + + /*encode it as length/distance pair or literal value*/ + if(length < 3) /*only lengths of 3 or higher are supported as length/distance pair*/ { + if(!uivector_push_back(out, in[pos])) ERROR_BREAK(83 /*alloc fail*/); + } else if(length < minmatch || (length == 3 && offset > 4096)) { + /*compensate for the fact that longer offsets have more extra bits, a + length of only 3 may be not worth it then*/ + if(!uivector_push_back(out, in[pos])) ERROR_BREAK(83 /*alloc fail*/); + } else { + addLengthDistance(out, length, offset); + for(i = 1; i < length; ++i) { + ++pos; + wpos = pos & (windowsize - 1); + hashval = getHash(in, insize, pos); + if(usezeros && hashval == 0) { + if(numzeros == 0) numzeros = countZeros(in, insize, pos); + else if(pos + numzeros > insize || in[pos + numzeros - 1] != 0) --numzeros; + } else { + numzeros = 0; + } + updateHashChain(hash, wpos, hashval, numzeros); + } + } + } /*end of the loop through each character of input*/ + + return error; +} + +/* /////////////////////////////////////////////////////////////////////////// */ + +static unsigned deflateNoCompression(ucvector* out, const unsigned char* data, size_t datasize) { + /*non compressed deflate block data: 1 bit BFINAL,2 bits BTYPE,(5 bits): it jumps to start of next byte, + 2 bytes LEN, 2 bytes NLEN, LEN bytes literal DATA*/ + + size_t i, numdeflateblocks = (datasize + 65534u) / 65535u; + unsigned datapos = 0; + for(i = 0; i != numdeflateblocks; ++i) { + unsigned BFINAL, BTYPE, LEN, NLEN; + unsigned char firstbyte; + size_t pos = out->size; + + BFINAL = (i == numdeflateblocks - 1); + BTYPE = 0; + + LEN = 65535; + if(datasize - datapos < 65535u) LEN = (unsigned)datasize - datapos; + NLEN = 65535 - LEN; + + if(!ucvector_resize(out, out->size + LEN + 5)) return 83; /*alloc fail*/ + + firstbyte = (unsigned char)(BFINAL + ((BTYPE & 1u) << 1u) + ((BTYPE & 2u) << 1u)); + out->data[pos + 0] = firstbyte; + out->data[pos + 1] = (unsigned char)(LEN & 255); + out->data[pos + 2] = (unsigned char)(LEN >> 8u); + out->data[pos + 3] = (unsigned char)(NLEN & 255); + out->data[pos + 4] = (unsigned char)(NLEN >> 8u); + lodepng_memcpy(out->data + pos + 5, data + datapos, LEN); + datapos += LEN; + } + + return 0; +} + +/* +write the lz77-encoded data, which has lit, len and dist codes, to compressed stream using huffman trees. +tree_ll: the tree for lit and len codes. +tree_d: the tree for distance codes. +*/ +static void writeLZ77data(LodePNGBitWriter* writer, const uivector* lz77_encoded, + const HuffmanTree* tree_ll, const HuffmanTree* tree_d) { + size_t i = 0; + for(i = 0; i != lz77_encoded->size; ++i) { + unsigned val = lz77_encoded->data[i]; + writeBitsReversed(writer, tree_ll->codes[val], tree_ll->lengths[val]); + if(val > 256) /*for a length code, 3 more things have to be added*/ { + unsigned length_index = val - FIRST_LENGTH_CODE_INDEX; + unsigned n_length_extra_bits = LENGTHEXTRA[length_index]; + unsigned length_extra_bits = lz77_encoded->data[++i]; + + unsigned distance_code = lz77_encoded->data[++i]; + + unsigned distance_index = distance_code; + unsigned n_distance_extra_bits = DISTANCEEXTRA[distance_index]; + unsigned distance_extra_bits = lz77_encoded->data[++i]; + + writeBits(writer, length_extra_bits, n_length_extra_bits); + writeBitsReversed(writer, tree_d->codes[distance_code], tree_d->lengths[distance_code]); + writeBits(writer, distance_extra_bits, n_distance_extra_bits); + } + } +} + +/*Deflate for a block of type "dynamic", that is, with freely, optimally, created huffman trees*/ +static unsigned deflateDynamic(LodePNGBitWriter* writer, Hash* hash, + const unsigned char* data, size_t datapos, size_t dataend, + const LodePNGCompressSettings* settings, unsigned final) { + unsigned error = 0; + + /* + A block is compressed as follows: The PNG data is lz77 encoded, resulting in + literal bytes and length/distance pairs. This is then huffman compressed with + two huffman trees. One huffman tree is used for the lit and len values ("ll"), + another huffman tree is used for the dist values ("d"). These two trees are + stored using their code lengths, and to compress even more these code lengths + are also run-length encoded and huffman compressed. This gives a huffman tree + of code lengths "cl". The code lengths used to describe this third tree are + the code length code lengths ("clcl"). + */ + + /*The lz77 encoded data, represented with integers since there will also be length and distance codes in it*/ + uivector lz77_encoded; + HuffmanTree tree_ll; /*tree for lit,len values*/ + HuffmanTree tree_d; /*tree for distance codes*/ + HuffmanTree tree_cl; /*tree for encoding the code lengths representing tree_ll and tree_d*/ + unsigned* frequencies_ll = 0; /*frequency of lit,len codes*/ + unsigned* frequencies_d = 0; /*frequency of dist codes*/ + unsigned* frequencies_cl = 0; /*frequency of code length codes*/ + unsigned* bitlen_lld = 0; /*lit,len,dist code lengths (int bits), literally (without repeat codes).*/ + unsigned* bitlen_lld_e = 0; /*bitlen_lld encoded with repeat codes (this is a rudimentary run length compression)*/ + size_t datasize = dataend - datapos; + + /* + If we could call "bitlen_cl" the the code length code lengths ("clcl"), that is the bit lengths of codes to represent + tree_cl in CLCL_ORDER, then due to the huffman compression of huffman tree representations ("two levels"), there are + some analogies: + bitlen_lld is to tree_cl what data is to tree_ll and tree_d. + bitlen_lld_e is to bitlen_lld what lz77_encoded is to data. + bitlen_cl is to bitlen_lld_e what bitlen_lld is to lz77_encoded. + */ + + unsigned BFINAL = final; + size_t i; + size_t numcodes_ll, numcodes_d, numcodes_lld, numcodes_lld_e, numcodes_cl; + unsigned HLIT, HDIST, HCLEN; + + uivector_init(&lz77_encoded); + HuffmanTree_init(&tree_ll); + HuffmanTree_init(&tree_d); + HuffmanTree_init(&tree_cl); + /* could fit on stack, but >1KB is on the larger side so allocate instead */ + frequencies_ll = (unsigned*)lodepng_malloc(286 * sizeof(*frequencies_ll)); + frequencies_d = (unsigned*)lodepng_malloc(30 * sizeof(*frequencies_d)); + frequencies_cl = (unsigned*)lodepng_malloc(NUM_CODE_LENGTH_CODES * sizeof(*frequencies_cl)); + + if(!frequencies_ll || !frequencies_d || !frequencies_cl) error = 83; /*alloc fail*/ + + /*This while loop never loops due to a break at the end, it is here to + allow breaking out of it to the cleanup phase on error conditions.*/ + while(!error) { + lodepng_memset(frequencies_ll, 0, 286 * sizeof(*frequencies_ll)); + lodepng_memset(frequencies_d, 0, 30 * sizeof(*frequencies_d)); + lodepng_memset(frequencies_cl, 0, NUM_CODE_LENGTH_CODES * sizeof(*frequencies_cl)); + + if(settings->use_lz77) { + error = encodeLZ77(&lz77_encoded, hash, data, datapos, dataend, settings->windowsize, + settings->minmatch, settings->nicematch, settings->lazymatching); + if(error) break; + } else { + if(!uivector_resize(&lz77_encoded, datasize)) ERROR_BREAK(83 /*alloc fail*/); + for(i = datapos; i < dataend; ++i) lz77_encoded.data[i - datapos] = data[i]; /*no LZ77, but still will be Huffman compressed*/ + } + + /*Count the frequencies of lit, len and dist codes*/ + for(i = 0; i != lz77_encoded.size; ++i) { + unsigned symbol = lz77_encoded.data[i]; + ++frequencies_ll[symbol]; + if(symbol > 256) { + unsigned dist = lz77_encoded.data[i + 2]; + ++frequencies_d[dist]; + i += 3; + } + } + frequencies_ll[256] = 1; /*there will be exactly 1 end code, at the end of the block*/ + + /*Make both huffman trees, one for the lit and len codes, one for the dist codes*/ + error = HuffmanTree_makeFromFrequencies(&tree_ll, frequencies_ll, 257, 286, 15); + if(error) break; + /*2, not 1, is chosen for mincodes: some buggy PNG decoders require at least 2 symbols in the dist tree*/ + error = HuffmanTree_makeFromFrequencies(&tree_d, frequencies_d, 2, 30, 15); + if(error) break; + + numcodes_ll = LODEPNG_MIN(tree_ll.numcodes, 286); + numcodes_d = LODEPNG_MIN(tree_d.numcodes, 30); + /*store the code lengths of both generated trees in bitlen_lld*/ + numcodes_lld = numcodes_ll + numcodes_d; + bitlen_lld = (unsigned*)lodepng_malloc(numcodes_lld * sizeof(*bitlen_lld)); + /*numcodes_lld_e never needs more size than bitlen_lld*/ + bitlen_lld_e = (unsigned*)lodepng_malloc(numcodes_lld * sizeof(*bitlen_lld_e)); + if(!bitlen_lld || !bitlen_lld_e) ERROR_BREAK(83); /*alloc fail*/ + numcodes_lld_e = 0; + + for(i = 0; i != numcodes_ll; ++i) bitlen_lld[i] = tree_ll.lengths[i]; + for(i = 0; i != numcodes_d; ++i) bitlen_lld[numcodes_ll + i] = tree_d.lengths[i]; + + /*run-length compress bitlen_ldd into bitlen_lld_e by using repeat codes 16 (copy length 3-6 times), + 17 (3-10 zeroes), 18 (11-138 zeroes)*/ + for(i = 0; i != numcodes_lld; ++i) { + unsigned j = 0; /*amount of repetitions*/ + while(i + j + 1 < numcodes_lld && bitlen_lld[i + j + 1] == bitlen_lld[i]) ++j; + + if(bitlen_lld[i] == 0 && j >= 2) /*repeat code for zeroes*/ { + ++j; /*include the first zero*/ + if(j <= 10) /*repeat code 17 supports max 10 zeroes*/ { + bitlen_lld_e[numcodes_lld_e++] = 17; + bitlen_lld_e[numcodes_lld_e++] = j - 3; + } else /*repeat code 18 supports max 138 zeroes*/ { + if(j > 138) j = 138; + bitlen_lld_e[numcodes_lld_e++] = 18; + bitlen_lld_e[numcodes_lld_e++] = j - 11; + } + i += (j - 1); + } else if(j >= 3) /*repeat code for value other than zero*/ { + size_t k; + unsigned num = j / 6u, rest = j % 6u; + bitlen_lld_e[numcodes_lld_e++] = bitlen_lld[i]; + for(k = 0; k < num; ++k) { + bitlen_lld_e[numcodes_lld_e++] = 16; + bitlen_lld_e[numcodes_lld_e++] = 6 - 3; + } + if(rest >= 3) { + bitlen_lld_e[numcodes_lld_e++] = 16; + bitlen_lld_e[numcodes_lld_e++] = rest - 3; + } + else j -= rest; + i += j; + } else /*too short to benefit from repeat code*/ { + bitlen_lld_e[numcodes_lld_e++] = bitlen_lld[i]; + } + } + + /*generate tree_cl, the huffmantree of huffmantrees*/ + for(i = 0; i != numcodes_lld_e; ++i) { + ++frequencies_cl[bitlen_lld_e[i]]; + /*after a repeat code come the bits that specify the number of repetitions, + those don't need to be in the frequencies_cl calculation*/ + if(bitlen_lld_e[i] >= 16) ++i; + } + + error = HuffmanTree_makeFromFrequencies(&tree_cl, frequencies_cl, + NUM_CODE_LENGTH_CODES, NUM_CODE_LENGTH_CODES, 7); + if(error) break; + + /*compute amount of code-length-code-lengths to output*/ + numcodes_cl = NUM_CODE_LENGTH_CODES; + /*trim zeros at the end (using CLCL_ORDER), but minimum size must be 4 (see HCLEN below)*/ + while(numcodes_cl > 4u && tree_cl.lengths[CLCL_ORDER[numcodes_cl - 1u]] == 0) { + numcodes_cl--; + } + + /* + Write everything into the output + + After the BFINAL and BTYPE, the dynamic block consists out of the following: + - 5 bits HLIT, 5 bits HDIST, 4 bits HCLEN + - (HCLEN+4)*3 bits code lengths of code length alphabet + - HLIT + 257 code lengths of lit/length alphabet (encoded using the code length + alphabet, + possible repetition codes 16, 17, 18) + - HDIST + 1 code lengths of distance alphabet (encoded using the code length + alphabet, + possible repetition codes 16, 17, 18) + - compressed data + - 256 (end code) + */ + + /*Write block type*/ + writeBits(writer, BFINAL, 1); + writeBits(writer, 0, 1); /*first bit of BTYPE "dynamic"*/ + writeBits(writer, 1, 1); /*second bit of BTYPE "dynamic"*/ + + /*write the HLIT, HDIST and HCLEN values*/ + /*all three sizes take trimmed ending zeroes into account, done either by HuffmanTree_makeFromFrequencies + or in the loop for numcodes_cl above, which saves space. */ + HLIT = (unsigned)(numcodes_ll - 257); + HDIST = (unsigned)(numcodes_d - 1); + HCLEN = (unsigned)(numcodes_cl - 4); + writeBits(writer, HLIT, 5); + writeBits(writer, HDIST, 5); + writeBits(writer, HCLEN, 4); + + /*write the code lengths of the code length alphabet ("bitlen_cl")*/ + for(i = 0; i != numcodes_cl; ++i) writeBits(writer, tree_cl.lengths[CLCL_ORDER[i]], 3); + + /*write the lengths of the lit/len AND the dist alphabet*/ + for(i = 0; i != numcodes_lld_e; ++i) { + writeBitsReversed(writer, tree_cl.codes[bitlen_lld_e[i]], tree_cl.lengths[bitlen_lld_e[i]]); + /*extra bits of repeat codes*/ + if(bitlen_lld_e[i] == 16) writeBits(writer, bitlen_lld_e[++i], 2); + else if(bitlen_lld_e[i] == 17) writeBits(writer, bitlen_lld_e[++i], 3); + else if(bitlen_lld_e[i] == 18) writeBits(writer, bitlen_lld_e[++i], 7); + } + + /*write the compressed data symbols*/ + writeLZ77data(writer, &lz77_encoded, &tree_ll, &tree_d); + /*error: the length of the end code 256 must be larger than 0*/ + if(tree_ll.lengths[256] == 0) ERROR_BREAK(64); + + /*write the end code*/ + writeBitsReversed(writer, tree_ll.codes[256], tree_ll.lengths[256]); + + break; /*end of error-while*/ + } + + /*cleanup*/ + uivector_cleanup(&lz77_encoded); + HuffmanTree_cleanup(&tree_ll); + HuffmanTree_cleanup(&tree_d); + HuffmanTree_cleanup(&tree_cl); + lodepng_free(frequencies_ll); + lodepng_free(frequencies_d); + lodepng_free(frequencies_cl); + lodepng_free(bitlen_lld); + lodepng_free(bitlen_lld_e); + + return error; +} + +static unsigned deflateFixed(LodePNGBitWriter* writer, Hash* hash, + const unsigned char* data, + size_t datapos, size_t dataend, + const LodePNGCompressSettings* settings, unsigned final) { + HuffmanTree tree_ll; /*tree for literal values and length codes*/ + HuffmanTree tree_d; /*tree for distance codes*/ + + unsigned BFINAL = final; + unsigned error = 0; + size_t i; + + HuffmanTree_init(&tree_ll); + HuffmanTree_init(&tree_d); + + error = generateFixedLitLenTree(&tree_ll); + if(!error) error = generateFixedDistanceTree(&tree_d); + + if(!error) { + writeBits(writer, BFINAL, 1); + writeBits(writer, 1, 1); /*first bit of BTYPE*/ + writeBits(writer, 0, 1); /*second bit of BTYPE*/ + + if(settings->use_lz77) /*LZ77 encoded*/ { + uivector lz77_encoded; + uivector_init(&lz77_encoded); + error = encodeLZ77(&lz77_encoded, hash, data, datapos, dataend, settings->windowsize, + settings->minmatch, settings->nicematch, settings->lazymatching); + if(!error) writeLZ77data(writer, &lz77_encoded, &tree_ll, &tree_d); + uivector_cleanup(&lz77_encoded); + } else /*no LZ77, but still will be Huffman compressed*/ { + for(i = datapos; i < dataend; ++i) { + writeBitsReversed(writer, tree_ll.codes[data[i]], tree_ll.lengths[data[i]]); + } + } + /*add END code*/ + if(!error) writeBitsReversed(writer,tree_ll.codes[256], tree_ll.lengths[256]); + } + + /*cleanup*/ + HuffmanTree_cleanup(&tree_ll); + HuffmanTree_cleanup(&tree_d); + + return error; +} + +static unsigned lodepng_deflatev(ucvector* out, const unsigned char* in, size_t insize, + const LodePNGCompressSettings* settings) { + unsigned error = 0; + size_t i, blocksize, numdeflateblocks; + Hash hash; + LodePNGBitWriter writer; + + LodePNGBitWriter_init(&writer, out); + + if(settings->btype > 2) return 61; + else if(settings->btype == 0) return deflateNoCompression(out, in, insize); + else if(settings->btype == 1) blocksize = insize; + else /*if(settings->btype == 2)*/ { + /*on PNGs, deflate blocks of 65-262k seem to give most dense encoding*/ + blocksize = insize / 8u + 8; + if(blocksize < 65536) blocksize = 65536; + if(blocksize > 262144) blocksize = 262144; + } + + numdeflateblocks = (insize + blocksize - 1) / blocksize; + if(numdeflateblocks == 0) numdeflateblocks = 1; + + error = hash_init(&hash, settings->windowsize); + + if(!error) { + for(i = 0; i != numdeflateblocks && !error; ++i) { + unsigned final = (i == numdeflateblocks - 1); + size_t start = i * blocksize; + size_t end = start + blocksize; + if(end > insize) end = insize; + + if(settings->btype == 1) error = deflateFixed(&writer, &hash, in, start, end, settings, final); + else if(settings->btype == 2) error = deflateDynamic(&writer, &hash, in, start, end, settings, final); + } + } + + hash_cleanup(&hash); + + return error; +} + +unsigned lodepng_deflate(unsigned char** out, size_t* outsize, + const unsigned char* in, size_t insize, + const LodePNGCompressSettings* settings) { + ucvector v = ucvector_init(*out, *outsize); + unsigned error = lodepng_deflatev(&v, in, insize, settings); + *out = v.data; + *outsize = v.size; + return error; +} + +static unsigned deflate(unsigned char** out, size_t* outsize, + const unsigned char* in, size_t insize, + const LodePNGCompressSettings* settings) { + if(settings->custom_deflate) { + unsigned error = settings->custom_deflate(out, outsize, in, insize, settings); + /*the custom deflate is allowed to have its own error codes, however, we translate it to code 111*/ + return error ? 111 : 0; + } else { + return lodepng_deflate(out, outsize, in, insize, settings); + } +} + +#endif /*LODEPNG_COMPILE_DECODER*/ + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / Adler32 / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +static unsigned update_adler32(unsigned adler, const unsigned char* data, unsigned len) { + unsigned s1 = adler & 0xffffu; + unsigned s2 = (adler >> 16u) & 0xffffu; + + while(len != 0u) { + unsigned i; + /*at least 5552 sums can be done before the sums overflow, saving a lot of module divisions*/ + unsigned amount = len > 5552u ? 5552u : len; + len -= amount; + for(i = 0; i != amount; ++i) { + s1 += (*data++); + s2 += s1; + } + s1 %= 65521u; + s2 %= 65521u; + } + + return (s2 << 16u) | s1; +} + +/*Return the adler32 of the bytes data[0..len-1]*/ +static unsigned adler32(const unsigned char* data, unsigned len) { + return update_adler32(1u, data, len); +} + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / Zlib / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +#ifdef LODEPNG_COMPILE_DECODER + +static unsigned lodepng_zlib_decompressv(ucvector* out, + const unsigned char* in, size_t insize, + const LodePNGDecompressSettings* settings) { + unsigned error = 0; + unsigned CM, CINFO, FDICT; + + if(insize < 2) return 53; /*error, size of zlib data too small*/ + /*read information from zlib header*/ + if((in[0] * 256 + in[1]) % 31 != 0) { + /*error: 256 * in[0] + in[1] must be a multiple of 31, the FCHECK value is supposed to be made that way*/ + return 24; + } + + CM = in[0] & 15; + CINFO = (in[0] >> 4) & 15; + /*FCHECK = in[1] & 31;*/ /*FCHECK is already tested above*/ + FDICT = (in[1] >> 5) & 1; + /*FLEVEL = (in[1] >> 6) & 3;*/ /*FLEVEL is not used here*/ + + if(CM != 8 || CINFO > 7) { + /*error: only compression method 8: inflate with sliding window of 32k is supported by the PNG spec*/ + return 25; + } + if(FDICT != 0) { + /*error: the specification of PNG says about the zlib stream: + "The additional flags shall not specify a preset dictionary."*/ + return 26; + } + + error = inflatev(out, in + 2, insize - 2, settings); + if(error) return error; + + if(!settings->ignore_adler32) { + unsigned ADLER32 = lodepng_read32bitInt(&in[insize - 4]); + unsigned checksum = adler32(out->data, (unsigned)(out->size)); + if(checksum != ADLER32) return 58; /*error, adler checksum not correct, data must be corrupted*/ + } + + return 0; /*no error*/ +} + + +unsigned lodepng_zlib_decompress(unsigned char** out, size_t* outsize, const unsigned char* in, + size_t insize, const LodePNGDecompressSettings* settings) { + ucvector v = ucvector_init(*out, *outsize); + unsigned error = lodepng_zlib_decompressv(&v, in, insize, settings); + *out = v.data; + *outsize = v.size; + return error; +} + +/*expected_size is expected output size, to avoid intermediate allocations. Set to 0 if not known. */ +static unsigned zlib_decompress(unsigned char** out, size_t* outsize, size_t expected_size, + const unsigned char* in, size_t insize, const LodePNGDecompressSettings* settings) { + unsigned error; + if(settings->custom_zlib) { + error = settings->custom_zlib(out, outsize, in, insize, settings); + if(error) { + /*the custom zlib is allowed to have its own error codes, however, we translate it to code 110*/ + error = 110; + /*if there's a max output size, and the custom zlib returned error, then indicate that error instead*/ + if(settings->max_output_size && *outsize > settings->max_output_size) error = 109; + } + } else { + ucvector v = ucvector_init(*out, *outsize); + if(expected_size) { + /*reserve the memory to avoid intermediate reallocations*/ + ucvector_resize(&v, *outsize + expected_size); + v.size = *outsize; + } + error = lodepng_zlib_decompressv(&v, in, insize, settings); + *out = v.data; + *outsize = v.size; + } + return error; +} + +#endif /*LODEPNG_COMPILE_DECODER*/ + +#ifdef LODEPNG_COMPILE_ENCODER + +unsigned lodepng_zlib_compress(unsigned char** out, size_t* outsize, const unsigned char* in, + size_t insize, const LodePNGCompressSettings* settings) { + size_t i; + unsigned error; + unsigned char* deflatedata = 0; + size_t deflatesize = 0; + + error = deflate(&deflatedata, &deflatesize, in, insize, settings); + + *out = NULL; + *outsize = 0; + if(!error) { + *outsize = deflatesize + 6; + *out = (unsigned char*)lodepng_malloc(*outsize); + if(!*out) error = 83; /*alloc fail*/ + } + + if(!error) { + unsigned ADLER32 = adler32(in, (unsigned)insize); + /*zlib data: 1 byte CMF (CM+CINFO), 1 byte FLG, deflate data, 4 byte ADLER32 checksum of the Decompressed data*/ + unsigned CMF = 120; /*0b01111000: CM 8, CINFO 7. With CINFO 7, any window size up to 32768 can be used.*/ + unsigned FLEVEL = 0; + unsigned FDICT = 0; + unsigned CMFFLG = 256 * CMF + FDICT * 32 + FLEVEL * 64; + unsigned FCHECK = 31 - CMFFLG % 31; + CMFFLG += FCHECK; + + (*out)[0] = (unsigned char)(CMFFLG >> 8); + (*out)[1] = (unsigned char)(CMFFLG & 255); + for(i = 0; i != deflatesize; ++i) (*out)[i + 2] = deflatedata[i]; + lodepng_set32bitInt(&(*out)[*outsize - 4], ADLER32); + } + + lodepng_free(deflatedata); + return error; +} + +/* compress using the default or custom zlib function */ +static unsigned zlib_compress(unsigned char** out, size_t* outsize, const unsigned char* in, + size_t insize, const LodePNGCompressSettings* settings) { + if(settings->custom_zlib) { + unsigned error = settings->custom_zlib(out, outsize, in, insize, settings); + /*the custom zlib is allowed to have its own error codes, however, we translate it to code 111*/ + return error ? 111 : 0; + } else { + return lodepng_zlib_compress(out, outsize, in, insize, settings); + } +} + +#endif /*LODEPNG_COMPILE_ENCODER*/ + +#else /*no LODEPNG_COMPILE_ZLIB*/ + +#ifdef LODEPNG_COMPILE_DECODER +static unsigned zlib_decompress(unsigned char** out, size_t* outsize, size_t expected_size, + const unsigned char* in, size_t insize, const LodePNGDecompressSettings* settings) { + if(!settings->custom_zlib) return 87; /*no custom zlib function provided */ + (void)expected_size; + return settings->custom_zlib(out, outsize, in, insize, settings); +} +#endif /*LODEPNG_COMPILE_DECODER*/ +#ifdef LODEPNG_COMPILE_ENCODER +static unsigned zlib_compress(unsigned char** out, size_t* outsize, const unsigned char* in, + size_t insize, const LodePNGCompressSettings* settings) { + if(!settings->custom_zlib) return 87; /*no custom zlib function provided */ + return settings->custom_zlib(out, outsize, in, insize, settings); +} +#endif /*LODEPNG_COMPILE_ENCODER*/ + +#endif /*LODEPNG_COMPILE_ZLIB*/ + +/* ////////////////////////////////////////////////////////////////////////// */ + +#ifdef LODEPNG_COMPILE_ENCODER + +/*this is a good tradeoff between speed and compression ratio*/ +#define DEFAULT_WINDOWSIZE 2048 + +void lodepng_compress_settings_init(LodePNGCompressSettings* settings) { + /*compress with dynamic huffman tree (not in the mathematical sense, just not the predefined one)*/ + settings->btype = 2; + settings->use_lz77 = 1; + settings->windowsize = DEFAULT_WINDOWSIZE; + settings->minmatch = 3; + settings->nicematch = 128; + settings->lazymatching = 1; + + settings->custom_zlib = 0; + settings->custom_deflate = 0; + settings->custom_context = 0; +} + +const LodePNGCompressSettings lodepng_default_compress_settings = {2, 1, DEFAULT_WINDOWSIZE, 3, 128, 1, 0, 0, 0}; + + +#endif /*LODEPNG_COMPILE_ENCODER*/ + +#ifdef LODEPNG_COMPILE_DECODER + +void lodepng_decompress_settings_init(LodePNGDecompressSettings* settings) { + settings->ignore_adler32 = 0; + settings->ignore_nlen = 0; + settings->max_output_size = 0; + + settings->custom_zlib = 0; + settings->custom_inflate = 0; + settings->custom_context = 0; +} + +const LodePNGDecompressSettings lodepng_default_decompress_settings = {0, 0, 0, 0, 0, 0}; + +#endif /*LODEPNG_COMPILE_DECODER*/ + +/* ////////////////////////////////////////////////////////////////////////// */ +/* ////////////////////////////////////////////////////////////////////////// */ +/* // End of Zlib related code. Begin of PNG related code. // */ +/* ////////////////////////////////////////////////////////////////////////// */ +/* ////////////////////////////////////////////////////////////////////////// */ + +#ifdef LODEPNG_COMPILE_PNG + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / CRC32 / */ +/* ////////////////////////////////////////////////////////////////////////// */ + + +#ifdef LODEPNG_COMPILE_CRC +/* CRC polynomial: 0xedb88320 */ +static unsigned lodepng_crc32_table[256] = { + 0u, 1996959894u, 3993919788u, 2567524794u, 124634137u, 1886057615u, 3915621685u, 2657392035u, + 249268274u, 2044508324u, 3772115230u, 2547177864u, 162941995u, 2125561021u, 3887607047u, 2428444049u, + 498536548u, 1789927666u, 4089016648u, 2227061214u, 450548861u, 1843258603u, 4107580753u, 2211677639u, + 325883990u, 1684777152u, 4251122042u, 2321926636u, 335633487u, 1661365465u, 4195302755u, 2366115317u, + 997073096u, 1281953886u, 3579855332u, 2724688242u, 1006888145u, 1258607687u, 3524101629u, 2768942443u, + 901097722u, 1119000684u, 3686517206u, 2898065728u, 853044451u, 1172266101u, 3705015759u, 2882616665u, + 651767980u, 1373503546u, 3369554304u, 3218104598u, 565507253u, 1454621731u, 3485111705u, 3099436303u, + 671266974u, 1594198024u, 3322730930u, 2970347812u, 795835527u, 1483230225u, 3244367275u, 3060149565u, + 1994146192u, 31158534u, 2563907772u, 4023717930u, 1907459465u, 112637215u, 2680153253u, 3904427059u, + 2013776290u, 251722036u, 2517215374u, 3775830040u, 2137656763u, 141376813u, 2439277719u, 3865271297u, + 1802195444u, 476864866u, 2238001368u, 4066508878u, 1812370925u, 453092731u, 2181625025u, 4111451223u, + 1706088902u, 314042704u, 2344532202u, 4240017532u, 1658658271u, 366619977u, 2362670323u, 4224994405u, + 1303535960u, 984961486u, 2747007092u, 3569037538u, 1256170817u, 1037604311u, 2765210733u, 3554079995u, + 1131014506u, 879679996u, 2909243462u, 3663771856u, 1141124467u, 855842277u, 2852801631u, 3708648649u, + 1342533948u, 654459306u, 3188396048u, 3373015174u, 1466479909u, 544179635u, 3110523913u, 3462522015u, + 1591671054u, 702138776u, 2966460450u, 3352799412u, 1504918807u, 783551873u, 3082640443u, 3233442989u, + 3988292384u, 2596254646u, 62317068u, 1957810842u, 3939845945u, 2647816111u, 81470997u, 1943803523u, + 3814918930u, 2489596804u, 225274430u, 2053790376u, 3826175755u, 2466906013u, 167816743u, 2097651377u, + 4027552580u, 2265490386u, 503444072u, 1762050814u, 4150417245u, 2154129355u, 426522225u, 1852507879u, + 4275313526u, 2312317920u, 282753626u, 1742555852u, 4189708143u, 2394877945u, 397917763u, 1622183637u, + 3604390888u, 2714866558u, 953729732u, 1340076626u, 3518719985u, 2797360999u, 1068828381u, 1219638859u, + 3624741850u, 2936675148u, 906185462u, 1090812512u, 3747672003u, 2825379669u, 829329135u, 1181335161u, + 3412177804u, 3160834842u, 628085408u, 1382605366u, 3423369109u, 3138078467u, 570562233u, 1426400815u, + 3317316542u, 2998733608u, 733239954u, 1555261956u, 3268935591u, 3050360625u, 752459403u, 1541320221u, + 2607071920u, 3965973030u, 1969922972u, 40735498u, 2617837225u, 3943577151u, 1913087877u, 83908371u, + 2512341634u, 3803740692u, 2075208622u, 213261112u, 2463272603u, 3855990285u, 2094854071u, 198958881u, + 2262029012u, 4057260610u, 1759359992u, 534414190u, 2176718541u, 4139329115u, 1873836001u, 414664567u, + 2282248934u, 4279200368u, 1711684554u, 285281116u, 2405801727u, 4167216745u, 1634467795u, 376229701u, + 2685067896u, 3608007406u, 1308918612u, 956543938u, 2808555105u, 3495958263u, 1231636301u, 1047427035u, + 2932959818u, 3654703836u, 1088359270u, 936918000u, 2847714899u, 3736837829u, 1202900863u, 817233897u, + 3183342108u, 3401237130u, 1404277552u, 615818150u, 3134207493u, 3453421203u, 1423857449u, 601450431u, + 3009837614u, 3294710456u, 1567103746u, 711928724u, 3020668471u, 3272380065u, 1510334235u, 755167117u +}; + +/*Return the CRC of the bytes buf[0..len-1].*/ +unsigned lodepng_crc32(const unsigned char* data, size_t length) { + unsigned r = 0xffffffffu; + size_t i; + for(i = 0; i < length; ++i) { + r = lodepng_crc32_table[(r ^ data[i]) & 0xffu] ^ (r >> 8u); + } + return r ^ 0xffffffffu; +} +#else /* LODEPNG_COMPILE_CRC */ +/*in this case, the function is only declared here, and must be defined externally +so that it will be linked in*/ +unsigned lodepng_crc32(const unsigned char* data, size_t length); +#endif /* LODEPNG_COMPILE_CRC */ + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / Reading and writing PNG color channel bits / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +/* The color channel bits of less-than-8-bit pixels are read with the MSB of bytes first, +so LodePNGBitWriter and LodePNGBitReader can't be used for those. */ + +static unsigned char readBitFromReversedStream(size_t* bitpointer, const unsigned char* bitstream) { + unsigned char result = (unsigned char)((bitstream[(*bitpointer) >> 3] >> (7 - ((*bitpointer) & 0x7))) & 1); + ++(*bitpointer); + return result; +} + +/* TODO: make this faster */ +static unsigned readBitsFromReversedStream(size_t* bitpointer, const unsigned char* bitstream, size_t nbits) { + unsigned result = 0; + size_t i; + for(i = 0 ; i < nbits; ++i) { + result <<= 1u; + result |= (unsigned)readBitFromReversedStream(bitpointer, bitstream); + } + return result; +} + +static void setBitOfReversedStream(size_t* bitpointer, unsigned char* bitstream, unsigned char bit) { + /*the current bit in bitstream may be 0 or 1 for this to work*/ + if(bit == 0) bitstream[(*bitpointer) >> 3u] &= (unsigned char)(~(1u << (7u - ((*bitpointer) & 7u)))); + else bitstream[(*bitpointer) >> 3u] |= (1u << (7u - ((*bitpointer) & 7u))); + ++(*bitpointer); +} + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / PNG chunks / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +unsigned lodepng_chunk_length(const unsigned char* chunk) { + return lodepng_read32bitInt(chunk); +} + +void lodepng_chunk_type(char type[5], const unsigned char* chunk) { + unsigned i; + for(i = 0; i != 4; ++i) type[i] = (char)chunk[4 + i]; + type[4] = 0; /*null termination char*/ +} + +unsigned char lodepng_chunk_type_equals(const unsigned char* chunk, const char* type) { + if(lodepng_strlen(type) != 4) return 0; + return (chunk[4] == type[0] && chunk[5] == type[1] && chunk[6] == type[2] && chunk[7] == type[3]); +} + +unsigned char lodepng_chunk_ancillary(const unsigned char* chunk) { + return((chunk[4] & 32) != 0); +} + +unsigned char lodepng_chunk_private(const unsigned char* chunk) { + return((chunk[6] & 32) != 0); +} + +unsigned char lodepng_chunk_safetocopy(const unsigned char* chunk) { + return((chunk[7] & 32) != 0); +} + +unsigned char* lodepng_chunk_data(unsigned char* chunk) { + return &chunk[8]; +} + +const unsigned char* lodepng_chunk_data_const(const unsigned char* chunk) { + return &chunk[8]; +} + +unsigned lodepng_chunk_check_crc(const unsigned char* chunk) { + unsigned length = lodepng_chunk_length(chunk); + unsigned CRC = lodepng_read32bitInt(&chunk[length + 8]); + /*the CRC is taken of the data and the 4 chunk type letters, not the length*/ + unsigned checksum = lodepng_crc32(&chunk[4], length + 4); + if(CRC != checksum) return 1; + else return 0; +} + +void lodepng_chunk_generate_crc(unsigned char* chunk) { + unsigned length = lodepng_chunk_length(chunk); + unsigned CRC = lodepng_crc32(&chunk[4], length + 4); + lodepng_set32bitInt(chunk + 8 + length, CRC); +} + +unsigned char* lodepng_chunk_next(unsigned char* chunk, unsigned char* end) { + size_t available_size = (size_t)(end - chunk); + if(chunk >= end || available_size < 12) return end; /*too small to contain a chunk*/ + if(chunk[0] == 0x89 && chunk[1] == 0x50 && chunk[2] == 0x4e && chunk[3] == 0x47 + && chunk[4] == 0x0d && chunk[5] == 0x0a && chunk[6] == 0x1a && chunk[7] == 0x0a) { + /* Is PNG magic header at start of PNG file. Jump to first actual chunk. */ + return chunk + 8; + } else { + size_t total_chunk_length; + if(lodepng_addofl(lodepng_chunk_length(chunk), 12, &total_chunk_length)) return end; + if(total_chunk_length > available_size) return end; /*outside of range*/ + return chunk + total_chunk_length; + } +} + +const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk, const unsigned char* end) { + size_t available_size = (size_t)(end - chunk); + if(chunk >= end || available_size < 12) return end; /*too small to contain a chunk*/ + if(chunk[0] == 0x89 && chunk[1] == 0x50 && chunk[2] == 0x4e && chunk[3] == 0x47 + && chunk[4] == 0x0d && chunk[5] == 0x0a && chunk[6] == 0x1a && chunk[7] == 0x0a) { + /* Is PNG magic header at start of PNG file. Jump to first actual chunk. */ + return chunk + 8; + } else { + size_t total_chunk_length; + if(lodepng_addofl(lodepng_chunk_length(chunk), 12, &total_chunk_length)) return end; + if(total_chunk_length > available_size) return end; /*outside of range*/ + return chunk + total_chunk_length; + } +} + +unsigned char* lodepng_chunk_find(unsigned char* chunk, unsigned char* end, const char type[5]) { + for(;;) { + if(chunk >= end || end - chunk < 12) return 0; /* past file end: chunk + 12 > end */ + if(lodepng_chunk_type_equals(chunk, type)) return chunk; + chunk = lodepng_chunk_next(chunk, end); + } +} + +const unsigned char* lodepng_chunk_find_const(const unsigned char* chunk, const unsigned char* end, const char type[5]) { + for(;;) { + if(chunk >= end || end - chunk < 12) return 0; /* past file end: chunk + 12 > end */ + if(lodepng_chunk_type_equals(chunk, type)) return chunk; + chunk = lodepng_chunk_next_const(chunk, end); + } +} + +unsigned lodepng_chunk_append(unsigned char** out, size_t* outsize, const unsigned char* chunk) { + unsigned i; + size_t total_chunk_length, new_length; + unsigned char *chunk_start, *new_buffer; + + if(lodepng_addofl(lodepng_chunk_length(chunk), 12, &total_chunk_length)) return 77; + if(lodepng_addofl(*outsize, total_chunk_length, &new_length)) return 77; + + new_buffer = (unsigned char*)lodepng_realloc(*out, new_length); + if(!new_buffer) return 83; /*alloc fail*/ + (*out) = new_buffer; + (*outsize) = new_length; + chunk_start = &(*out)[new_length - total_chunk_length]; + + for(i = 0; i != total_chunk_length; ++i) chunk_start[i] = chunk[i]; + + return 0; +} + +/*Sets length and name and allocates the space for data and crc but does not +set data or crc yet. Returns the start of the chunk in chunk. The start of +the data is at chunk + 8. To finalize chunk, add the data, then use +lodepng_chunk_generate_crc */ +static unsigned lodepng_chunk_init(unsigned char** chunk, + ucvector* out, + unsigned length, const char* type) { + size_t new_length = out->size; + if(lodepng_addofl(new_length, length, &new_length)) return 77; + if(lodepng_addofl(new_length, 12, &new_length)) return 77; + if(!ucvector_resize(out, new_length)) return 83; /*alloc fail*/ + *chunk = out->data + new_length - length - 12u; + + /*1: length*/ + lodepng_set32bitInt(*chunk, length); + + /*2: chunk name (4 letters)*/ + lodepng_memcpy(*chunk + 4, type, 4); + + return 0; +} + +/* like lodepng_chunk_create but with custom allocsize */ +static unsigned lodepng_chunk_createv(ucvector* out, + unsigned length, const char* type, const unsigned char* data) { + unsigned char* chunk; + CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, length, type)); + + /*3: the data*/ + lodepng_memcpy(chunk + 8, data, length); + + /*4: CRC (of the chunkname characters and the data)*/ + lodepng_chunk_generate_crc(chunk); + + return 0; +} + +unsigned lodepng_chunk_create(unsigned char** out, size_t* outsize, + unsigned length, const char* type, const unsigned char* data) { + ucvector v = ucvector_init(*out, *outsize); + unsigned error = lodepng_chunk_createv(&v, length, type, data); + *out = v.data; + *outsize = v.size; + return error; +} + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / Color types, channels, bits / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +/*checks if the colortype is valid and the bitdepth bd is allowed for this colortype. +Return value is a LodePNG error code.*/ +static unsigned checkColorValidity(LodePNGColorType colortype, unsigned bd) { + switch(colortype) { + case LCT_GREY: if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 || bd == 16)) return 37; break; + case LCT_RGB: if(!( bd == 8 || bd == 16)) return 37; break; + case LCT_PALETTE: if(!(bd == 1 || bd == 2 || bd == 4 || bd == 8 )) return 37; break; + case LCT_GREY_ALPHA: if(!( bd == 8 || bd == 16)) return 37; break; + case LCT_RGBA: if(!( bd == 8 || bd == 16)) return 37; break; + case LCT_MAX_OCTET_VALUE: return 31; /* invalid color type */ + default: return 31; /* invalid color type */ + } + return 0; /*allowed color type / bits combination*/ +} + +static unsigned getNumColorChannels(LodePNGColorType colortype) { + switch(colortype) { + case LCT_GREY: return 1; + case LCT_RGB: return 3; + case LCT_PALETTE: return 1; + case LCT_GREY_ALPHA: return 2; + case LCT_RGBA: return 4; + case LCT_MAX_OCTET_VALUE: return 0; /* invalid color type */ + default: return 0; /*invalid color type*/ + } +} + +static unsigned lodepng_get_bpp_lct(LodePNGColorType colortype, unsigned bitdepth) { + /*bits per pixel is amount of channels * bits per channel*/ + return getNumColorChannels(colortype) * bitdepth; +} + +/* ////////////////////////////////////////////////////////////////////////// */ + +void lodepng_color_mode_init(LodePNGColorMode* info) { + info->key_defined = 0; + info->key_r = info->key_g = info->key_b = 0; + info->colortype = LCT_RGBA; + info->bitdepth = 8; + info->palette = 0; + info->palettesize = 0; +} + +/*allocates palette memory if needed, and initializes all colors to black*/ +static void lodepng_color_mode_alloc_palette(LodePNGColorMode* info) { + size_t i; + /*if the palette is already allocated, it will have size 1024 so no reallocation needed in that case*/ + /*the palette must have room for up to 256 colors with 4 bytes each.*/ + if(!info->palette) info->palette = (unsigned char*)lodepng_malloc(1024); + if(!info->palette) return; /*alloc fail*/ + for(i = 0; i != 256; ++i) { + /*Initialize all unused colors with black, the value used for invalid palette indices. + This is an error according to the PNG spec, but common PNG decoders make it black instead. + That makes color conversion slightly faster due to no error handling needed.*/ + info->palette[i * 4 + 0] = 0; + info->palette[i * 4 + 1] = 0; + info->palette[i * 4 + 2] = 0; + info->palette[i * 4 + 3] = 255; + } +} + +void lodepng_color_mode_cleanup(LodePNGColorMode* info) { + lodepng_palette_clear(info); +} + +unsigned lodepng_color_mode_copy(LodePNGColorMode* dest, const LodePNGColorMode* source) { + lodepng_color_mode_cleanup(dest); + lodepng_memcpy(dest, source, sizeof(LodePNGColorMode)); + if(source->palette) { + dest->palette = (unsigned char*)lodepng_malloc(1024); + if(!dest->palette && source->palettesize) return 83; /*alloc fail*/ + lodepng_memcpy(dest->palette, source->palette, source->palettesize * 4); + } + return 0; +} + +LodePNGColorMode lodepng_color_mode_make(LodePNGColorType colortype, unsigned bitdepth) { + LodePNGColorMode result; + lodepng_color_mode_init(&result); + result.colortype = colortype; + result.bitdepth = bitdepth; + return result; +} + +static int lodepng_color_mode_equal(const LodePNGColorMode* a, const LodePNGColorMode* b) { + size_t i; + if(a->colortype != b->colortype) return 0; + if(a->bitdepth != b->bitdepth) return 0; + if(a->key_defined != b->key_defined) return 0; + if(a->key_defined) { + if(a->key_r != b->key_r) return 0; + if(a->key_g != b->key_g) return 0; + if(a->key_b != b->key_b) return 0; + } + if(a->palettesize != b->palettesize) return 0; + for(i = 0; i != a->palettesize * 4; ++i) { + if(a->palette[i] != b->palette[i]) return 0; + } + return 1; +} + +void lodepng_palette_clear(LodePNGColorMode* info) { + if(info->palette) lodepng_free(info->palette); + info->palette = 0; + info->palettesize = 0; +} + +unsigned lodepng_palette_add(LodePNGColorMode* info, + unsigned char r, unsigned char g, unsigned char b, unsigned char a) { + if(!info->palette) /*allocate palette if empty*/ { + lodepng_color_mode_alloc_palette(info); + if(!info->palette) return 83; /*alloc fail*/ + } + if(info->palettesize >= 256) { + return 108; /*too many palette values*/ + } + info->palette[4 * info->palettesize + 0] = r; + info->palette[4 * info->palettesize + 1] = g; + info->palette[4 * info->palettesize + 2] = b; + info->palette[4 * info->palettesize + 3] = a; + ++info->palettesize; + return 0; +} + +/*calculate bits per pixel out of colortype and bitdepth*/ +unsigned lodepng_get_bpp(const LodePNGColorMode* info) { + return lodepng_get_bpp_lct(info->colortype, info->bitdepth); +} + +unsigned lodepng_get_channels(const LodePNGColorMode* info) { + return getNumColorChannels(info->colortype); +} + +unsigned lodepng_is_greyscale_type(const LodePNGColorMode* info) { + return info->colortype == LCT_GREY || info->colortype == LCT_GREY_ALPHA; +} + +unsigned lodepng_is_alpha_type(const LodePNGColorMode* info) { + return (info->colortype & 4) != 0; /*4 or 6*/ +} + +unsigned lodepng_is_palette_type(const LodePNGColorMode* info) { + return info->colortype == LCT_PALETTE; +} + +unsigned lodepng_has_palette_alpha(const LodePNGColorMode* info) { + size_t i; + for(i = 0; i != info->palettesize; ++i) { + if(info->palette[i * 4 + 3] < 255) return 1; + } + return 0; +} + +unsigned lodepng_can_have_alpha(const LodePNGColorMode* info) { + return info->key_defined + || lodepng_is_alpha_type(info) + || lodepng_has_palette_alpha(info); +} + +static size_t lodepng_get_raw_size_lct(unsigned w, unsigned h, LodePNGColorType colortype, unsigned bitdepth) { + size_t bpp = lodepng_get_bpp_lct(colortype, bitdepth); + size_t n = (size_t)w * (size_t)h; + return ((n / 8u) * bpp) + ((n & 7u) * bpp + 7u) / 8u; +} + +size_t lodepng_get_raw_size(unsigned w, unsigned h, const LodePNGColorMode* color) { + return lodepng_get_raw_size_lct(w, h, color->colortype, color->bitdepth); +} + + +#ifdef LODEPNG_COMPILE_PNG + +/*in an idat chunk, each scanline is a multiple of 8 bits, unlike the lodepng output buffer, +and in addition has one extra byte per line: the filter byte. So this gives a larger +result than lodepng_get_raw_size. Set h to 1 to get the size of 1 row including filter byte. */ +static size_t lodepng_get_raw_size_idat(unsigned w, unsigned h, unsigned bpp) { + /* + 1 for the filter byte, and possibly plus padding bits per line. */ + /* Ignoring casts, the expression is equal to (w * bpp + 7) / 8 + 1, but avoids overflow of w * bpp */ + size_t line = ((size_t)(w / 8u) * bpp) + 1u + ((w & 7u) * bpp + 7u) / 8u; + return (size_t)h * line; +} + +#ifdef LODEPNG_COMPILE_DECODER +/*Safely checks whether size_t overflow can be caused due to amount of pixels. +This check is overcautious rather than precise. If this check indicates no overflow, +you can safely compute in a size_t (but not an unsigned): +-(size_t)w * (size_t)h * 8 +-amount of bytes in IDAT (including filter, padding and Adam7 bytes) +-amount of bytes in raw color model +Returns 1 if overflow possible, 0 if not. +*/ +static int lodepng_pixel_overflow(unsigned w, unsigned h, + const LodePNGColorMode* pngcolor, const LodePNGColorMode* rawcolor) { + size_t bpp = LODEPNG_MAX(lodepng_get_bpp(pngcolor), lodepng_get_bpp(rawcolor)); + size_t numpixels, total; + size_t line; /* bytes per line in worst case */ + + if(lodepng_mulofl((size_t)w, (size_t)h, &numpixels)) return 1; + if(lodepng_mulofl(numpixels, 8, &total)) return 1; /* bit pointer with 8-bit color, or 8 bytes per channel color */ + + /* Bytes per scanline with the expression "(w / 8u) * bpp) + ((w & 7u) * bpp + 7u) / 8u" */ + if(lodepng_mulofl((size_t)(w / 8u), bpp, &line)) return 1; + if(lodepng_addofl(line, ((w & 7u) * bpp + 7u) / 8u, &line)) return 1; + + if(lodepng_addofl(line, 5, &line)) return 1; /* 5 bytes overhead per line: 1 filterbyte, 4 for Adam7 worst case */ + if(lodepng_mulofl(line, h, &total)) return 1; /* Total bytes in worst case */ + + return 0; /* no overflow */ +} +#endif /*LODEPNG_COMPILE_DECODER*/ +#endif /*LODEPNG_COMPILE_PNG*/ + +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + +static void LodePNGUnknownChunks_init(LodePNGInfo* info) { + unsigned i; + for(i = 0; i != 3; ++i) info->unknown_chunks_data[i] = 0; + for(i = 0; i != 3; ++i) info->unknown_chunks_size[i] = 0; +} + +static void LodePNGUnknownChunks_cleanup(LodePNGInfo* info) { + unsigned i; + for(i = 0; i != 3; ++i) lodepng_free(info->unknown_chunks_data[i]); +} + +static unsigned LodePNGUnknownChunks_copy(LodePNGInfo* dest, const LodePNGInfo* src) { + unsigned i; + + LodePNGUnknownChunks_cleanup(dest); + + for(i = 0; i != 3; ++i) { + size_t j; + dest->unknown_chunks_size[i] = src->unknown_chunks_size[i]; + dest->unknown_chunks_data[i] = (unsigned char*)lodepng_malloc(src->unknown_chunks_size[i]); + if(!dest->unknown_chunks_data[i] && dest->unknown_chunks_size[i]) return 83; /*alloc fail*/ + for(j = 0; j < src->unknown_chunks_size[i]; ++j) { + dest->unknown_chunks_data[i][j] = src->unknown_chunks_data[i][j]; + } + } + + return 0; +} + +/******************************************************************************/ + +static void LodePNGText_init(LodePNGInfo* info) { + info->text_num = 0; + info->text_keys = NULL; + info->text_strings = NULL; +} + +static void LodePNGText_cleanup(LodePNGInfo* info) { + size_t i; + for(i = 0; i != info->text_num; ++i) { + string_cleanup(&info->text_keys[i]); + string_cleanup(&info->text_strings[i]); + } + lodepng_free(info->text_keys); + lodepng_free(info->text_strings); +} + +static unsigned LodePNGText_copy(LodePNGInfo* dest, const LodePNGInfo* source) { + size_t i = 0; + dest->text_keys = NULL; + dest->text_strings = NULL; + dest->text_num = 0; + for(i = 0; i != source->text_num; ++i) { + CERROR_TRY_RETURN(lodepng_add_text(dest, source->text_keys[i], source->text_strings[i])); + } + return 0; +} + +static unsigned lodepng_add_text_sized(LodePNGInfo* info, const char* key, const char* str, size_t size) { + char** new_keys = (char**)(lodepng_realloc(info->text_keys, sizeof(char*) * (info->text_num + 1))); + char** new_strings = (char**)(lodepng_realloc(info->text_strings, sizeof(char*) * (info->text_num + 1))); + + if(new_keys) info->text_keys = new_keys; + if(new_strings) info->text_strings = new_strings; + + if(!new_keys || !new_strings) return 83; /*alloc fail*/ + + ++info->text_num; + info->text_keys[info->text_num - 1] = alloc_string(key); + info->text_strings[info->text_num - 1] = alloc_string_sized(str, size); + if(!info->text_keys[info->text_num - 1] || !info->text_strings[info->text_num - 1]) return 83; /*alloc fail*/ + + return 0; +} + +unsigned lodepng_add_text(LodePNGInfo* info, const char* key, const char* str) { + return lodepng_add_text_sized(info, key, str, lodepng_strlen(str)); +} + +void lodepng_clear_text(LodePNGInfo* info) { + LodePNGText_cleanup(info); +} + +/******************************************************************************/ + +static void LodePNGIText_init(LodePNGInfo* info) { + info->itext_num = 0; + info->itext_keys = NULL; + info->itext_langtags = NULL; + info->itext_transkeys = NULL; + info->itext_strings = NULL; +} + +static void LodePNGIText_cleanup(LodePNGInfo* info) { + size_t i; + for(i = 0; i != info->itext_num; ++i) { + string_cleanup(&info->itext_keys[i]); + string_cleanup(&info->itext_langtags[i]); + string_cleanup(&info->itext_transkeys[i]); + string_cleanup(&info->itext_strings[i]); + } + lodepng_free(info->itext_keys); + lodepng_free(info->itext_langtags); + lodepng_free(info->itext_transkeys); + lodepng_free(info->itext_strings); +} + +static unsigned LodePNGIText_copy(LodePNGInfo* dest, const LodePNGInfo* source) { + size_t i = 0; + dest->itext_keys = NULL; + dest->itext_langtags = NULL; + dest->itext_transkeys = NULL; + dest->itext_strings = NULL; + dest->itext_num = 0; + for(i = 0; i != source->itext_num; ++i) { + CERROR_TRY_RETURN(lodepng_add_itext(dest, source->itext_keys[i], source->itext_langtags[i], + source->itext_transkeys[i], source->itext_strings[i])); + } + return 0; +} + +void lodepng_clear_itext(LodePNGInfo* info) { + LodePNGIText_cleanup(info); +} + +static unsigned lodepng_add_itext_sized(LodePNGInfo* info, const char* key, const char* langtag, + const char* transkey, const char* str, size_t size) { + char** new_keys = (char**)(lodepng_realloc(info->itext_keys, sizeof(char*) * (info->itext_num + 1))); + char** new_langtags = (char**)(lodepng_realloc(info->itext_langtags, sizeof(char*) * (info->itext_num + 1))); + char** new_transkeys = (char**)(lodepng_realloc(info->itext_transkeys, sizeof(char*) * (info->itext_num + 1))); + char** new_strings = (char**)(lodepng_realloc(info->itext_strings, sizeof(char*) * (info->itext_num + 1))); + + if(new_keys) info->itext_keys = new_keys; + if(new_langtags) info->itext_langtags = new_langtags; + if(new_transkeys) info->itext_transkeys = new_transkeys; + if(new_strings) info->itext_strings = new_strings; + + if(!new_keys || !new_langtags || !new_transkeys || !new_strings) return 83; /*alloc fail*/ + + ++info->itext_num; + + info->itext_keys[info->itext_num - 1] = alloc_string(key); + info->itext_langtags[info->itext_num - 1] = alloc_string(langtag); + info->itext_transkeys[info->itext_num - 1] = alloc_string(transkey); + info->itext_strings[info->itext_num - 1] = alloc_string_sized(str, size); + + return 0; +} + +unsigned lodepng_add_itext(LodePNGInfo* info, const char* key, const char* langtag, + const char* transkey, const char* str) { + return lodepng_add_itext_sized(info, key, langtag, transkey, str, lodepng_strlen(str)); +} + +/* same as set but does not delete */ +static unsigned lodepng_assign_icc(LodePNGInfo* info, const char* name, const unsigned char* profile, unsigned profile_size) { + if(profile_size == 0) return 100; /*invalid ICC profile size*/ + + info->iccp_name = alloc_string(name); + info->iccp_profile = (unsigned char*)lodepng_malloc(profile_size); + + if(!info->iccp_name || !info->iccp_profile) return 83; /*alloc fail*/ + + lodepng_memcpy(info->iccp_profile, profile, profile_size); + info->iccp_profile_size = profile_size; + + return 0; /*ok*/ +} + +unsigned lodepng_set_icc(LodePNGInfo* info, const char* name, const unsigned char* profile, unsigned profile_size) { + if(info->iccp_name) lodepng_clear_icc(info); + info->iccp_defined = 1; + + return lodepng_assign_icc(info, name, profile, profile_size); +} + +void lodepng_clear_icc(LodePNGInfo* info) { + string_cleanup(&info->iccp_name); + lodepng_free(info->iccp_profile); + info->iccp_profile = NULL; + info->iccp_profile_size = 0; + info->iccp_defined = 0; +} +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + +void lodepng_info_init(LodePNGInfo* info) { + lodepng_color_mode_init(&info->color); + info->interlace_method = 0; + info->compression_method = 0; + info->filter_method = 0; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + info->background_defined = 0; + info->background_r = info->background_g = info->background_b = 0; + + LodePNGText_init(info); + LodePNGIText_init(info); + + info->time_defined = 0; + info->phys_defined = 0; + + info->gama_defined = 0; + info->chrm_defined = 0; + info->srgb_defined = 0; + info->iccp_defined = 0; + info->iccp_name = NULL; + info->iccp_profile = NULL; + + info->sbit_defined = 0; + info->sbit_r = info->sbit_g = info->sbit_b = info->sbit_a = 0; + + LodePNGUnknownChunks_init(info); +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ +} + +void lodepng_info_cleanup(LodePNGInfo* info) { + lodepng_color_mode_cleanup(&info->color); +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + LodePNGText_cleanup(info); + LodePNGIText_cleanup(info); + + lodepng_clear_icc(info); + + LodePNGUnknownChunks_cleanup(info); +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ +} + +unsigned lodepng_info_copy(LodePNGInfo* dest, const LodePNGInfo* source) { + lodepng_info_cleanup(dest); + lodepng_memcpy(dest, source, sizeof(LodePNGInfo)); + lodepng_color_mode_init(&dest->color); + CERROR_TRY_RETURN(lodepng_color_mode_copy(&dest->color, &source->color)); + +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + CERROR_TRY_RETURN(LodePNGText_copy(dest, source)); + CERROR_TRY_RETURN(LodePNGIText_copy(dest, source)); + if(source->iccp_defined) { + CERROR_TRY_RETURN(lodepng_assign_icc(dest, source->iccp_name, source->iccp_profile, source->iccp_profile_size)); + } + + LodePNGUnknownChunks_init(dest); + CERROR_TRY_RETURN(LodePNGUnknownChunks_copy(dest, source)); +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + return 0; +} + +/* ////////////////////////////////////////////////////////////////////////// */ + +/*index: bitgroup index, bits: bitgroup size(1, 2 or 4), in: bitgroup value, out: octet array to add bits to*/ +static void addColorBits(unsigned char* out, size_t index, unsigned bits, unsigned in) { + unsigned m = bits == 1 ? 7 : bits == 2 ? 3 : 1; /*8 / bits - 1*/ + /*p = the partial index in the byte, e.g. with 4 palettebits it is 0 for first half or 1 for second half*/ + unsigned p = index & m; + in &= (1u << bits) - 1u; /*filter out any other bits of the input value*/ + in = in << (bits * (m - p)); + if(p == 0) out[index * bits / 8u] = in; + else out[index * bits / 8u] |= in; +} + +typedef struct ColorTree ColorTree; + +/* +One node of a color tree +This is the data structure used to count the number of unique colors and to get a palette +index for a color. It's like an octree, but because the alpha channel is used too, each +node has 16 instead of 8 children. +*/ +struct ColorTree { + ColorTree* children[16]; /*up to 16 pointers to ColorTree of next level*/ + int index; /*the payload. Only has a meaningful value if this is in the last level*/ +}; + +static void color_tree_init(ColorTree* tree) { + lodepng_memset(tree->children, 0, 16 * sizeof(*tree->children)); + tree->index = -1; +} + +static void color_tree_cleanup(ColorTree* tree) { + int i; + for(i = 0; i != 16; ++i) { + if(tree->children[i]) { + color_tree_cleanup(tree->children[i]); + lodepng_free(tree->children[i]); + } + } +} + +/*returns -1 if color not present, its index otherwise*/ +static int color_tree_get(ColorTree* tree, unsigned char r, unsigned char g, unsigned char b, unsigned char a) { + int bit = 0; + for(bit = 0; bit < 8; ++bit) { + int i = 8 * ((r >> bit) & 1) + 4 * ((g >> bit) & 1) + 2 * ((b >> bit) & 1) + 1 * ((a >> bit) & 1); + if(!tree->children[i]) return -1; + else tree = tree->children[i]; + } + return tree ? tree->index : -1; +} + +#ifdef LODEPNG_COMPILE_ENCODER +static int color_tree_has(ColorTree* tree, unsigned char r, unsigned char g, unsigned char b, unsigned char a) { + return color_tree_get(tree, r, g, b, a) >= 0; +} +#endif /*LODEPNG_COMPILE_ENCODER*/ + +/*color is not allowed to already exist. +Index should be >= 0 (it's signed to be compatible with using -1 for "doesn't exist") +Returns error code, or 0 if ok*/ +static unsigned color_tree_add(ColorTree* tree, + unsigned char r, unsigned char g, unsigned char b, unsigned char a, unsigned index) { + int bit; + for(bit = 0; bit < 8; ++bit) { + int i = 8 * ((r >> bit) & 1) + 4 * ((g >> bit) & 1) + 2 * ((b >> bit) & 1) + 1 * ((a >> bit) & 1); + if(!tree->children[i]) { + tree->children[i] = (ColorTree*)lodepng_malloc(sizeof(ColorTree)); + if(!tree->children[i]) return 83; /*alloc fail*/ + color_tree_init(tree->children[i]); + } + tree = tree->children[i]; + } + tree->index = (int)index; + return 0; +} + +/*put a pixel, given its RGBA color, into image of any color type*/ +static unsigned rgba8ToPixel(unsigned char* out, size_t i, + const LodePNGColorMode* mode, ColorTree* tree /*for palette*/, + unsigned char r, unsigned char g, unsigned char b, unsigned char a) { + if(mode->colortype == LCT_GREY) { + unsigned char gray = r; /*((unsigned short)r + g + b) / 3u;*/ + if(mode->bitdepth == 8) out[i] = gray; + else if(mode->bitdepth == 16) out[i * 2 + 0] = out[i * 2 + 1] = gray; + else { + /*take the most significant bits of gray*/ + gray = ((unsigned)gray >> (8u - mode->bitdepth)) & ((1u << mode->bitdepth) - 1u); + addColorBits(out, i, mode->bitdepth, gray); + } + } else if(mode->colortype == LCT_RGB) { + if(mode->bitdepth == 8) { + out[i * 3 + 0] = r; + out[i * 3 + 1] = g; + out[i * 3 + 2] = b; + } else { + out[i * 6 + 0] = out[i * 6 + 1] = r; + out[i * 6 + 2] = out[i * 6 + 3] = g; + out[i * 6 + 4] = out[i * 6 + 5] = b; + } + } else if(mode->colortype == LCT_PALETTE) { + int index = color_tree_get(tree, r, g, b, a); + if(index < 0) return 82; /*color not in palette*/ + if(mode->bitdepth == 8) out[i] = index; + else addColorBits(out, i, mode->bitdepth, (unsigned)index); + } else if(mode->colortype == LCT_GREY_ALPHA) { + unsigned char gray = r; /*((unsigned short)r + g + b) / 3u;*/ + if(mode->bitdepth == 8) { + out[i * 2 + 0] = gray; + out[i * 2 + 1] = a; + } else if(mode->bitdepth == 16) { + out[i * 4 + 0] = out[i * 4 + 1] = gray; + out[i * 4 + 2] = out[i * 4 + 3] = a; + } + } else if(mode->colortype == LCT_RGBA) { + if(mode->bitdepth == 8) { + out[i * 4 + 0] = r; + out[i * 4 + 1] = g; + out[i * 4 + 2] = b; + out[i * 4 + 3] = a; + } else { + out[i * 8 + 0] = out[i * 8 + 1] = r; + out[i * 8 + 2] = out[i * 8 + 3] = g; + out[i * 8 + 4] = out[i * 8 + 5] = b; + out[i * 8 + 6] = out[i * 8 + 7] = a; + } + } + + return 0; /*no error*/ +} + +/*put a pixel, given its RGBA16 color, into image of any color 16-bitdepth type*/ +static void rgba16ToPixel(unsigned char* out, size_t i, + const LodePNGColorMode* mode, + unsigned short r, unsigned short g, unsigned short b, unsigned short a) { + if(mode->colortype == LCT_GREY) { + unsigned short gray = r; /*((unsigned)r + g + b) / 3u;*/ + out[i * 2 + 0] = (gray >> 8) & 255; + out[i * 2 + 1] = gray & 255; + } else if(mode->colortype == LCT_RGB) { + out[i * 6 + 0] = (r >> 8) & 255; + out[i * 6 + 1] = r & 255; + out[i * 6 + 2] = (g >> 8) & 255; + out[i * 6 + 3] = g & 255; + out[i * 6 + 4] = (b >> 8) & 255; + out[i * 6 + 5] = b & 255; + } else if(mode->colortype == LCT_GREY_ALPHA) { + unsigned short gray = r; /*((unsigned)r + g + b) / 3u;*/ + out[i * 4 + 0] = (gray >> 8) & 255; + out[i * 4 + 1] = gray & 255; + out[i * 4 + 2] = (a >> 8) & 255; + out[i * 4 + 3] = a & 255; + } else if(mode->colortype == LCT_RGBA) { + out[i * 8 + 0] = (r >> 8) & 255; + out[i * 8 + 1] = r & 255; + out[i * 8 + 2] = (g >> 8) & 255; + out[i * 8 + 3] = g & 255; + out[i * 8 + 4] = (b >> 8) & 255; + out[i * 8 + 5] = b & 255; + out[i * 8 + 6] = (a >> 8) & 255; + out[i * 8 + 7] = a & 255; + } +} + +/*Get RGBA8 color of pixel with index i (y * width + x) from the raw image with given color type.*/ +static void getPixelColorRGBA8(unsigned char* r, unsigned char* g, + unsigned char* b, unsigned char* a, + const unsigned char* in, size_t i, + const LodePNGColorMode* mode) { + if(mode->colortype == LCT_GREY) { + if(mode->bitdepth == 8) { + *r = *g = *b = in[i]; + if(mode->key_defined && *r == mode->key_r) *a = 0; + else *a = 255; + } else if(mode->bitdepth == 16) { + *r = *g = *b = in[i * 2 + 0]; + if(mode->key_defined && 256U * in[i * 2 + 0] + in[i * 2 + 1] == mode->key_r) *a = 0; + else *a = 255; + } else { + unsigned highest = ((1U << mode->bitdepth) - 1U); /*highest possible value for this bit depth*/ + size_t j = i * mode->bitdepth; + unsigned value = readBitsFromReversedStream(&j, in, mode->bitdepth); + *r = *g = *b = (value * 255) / highest; + if(mode->key_defined && value == mode->key_r) *a = 0; + else *a = 255; + } + } else if(mode->colortype == LCT_RGB) { + if(mode->bitdepth == 8) { + *r = in[i * 3 + 0]; *g = in[i * 3 + 1]; *b = in[i * 3 + 2]; + if(mode->key_defined && *r == mode->key_r && *g == mode->key_g && *b == mode->key_b) *a = 0; + else *a = 255; + } else { + *r = in[i * 6 + 0]; + *g = in[i * 6 + 2]; + *b = in[i * 6 + 4]; + if(mode->key_defined && 256U * in[i * 6 + 0] + in[i * 6 + 1] == mode->key_r + && 256U * in[i * 6 + 2] + in[i * 6 + 3] == mode->key_g + && 256U * in[i * 6 + 4] + in[i * 6 + 5] == mode->key_b) *a = 0; + else *a = 255; + } + } else if(mode->colortype == LCT_PALETTE) { + unsigned index; + if(mode->bitdepth == 8) index = in[i]; + else { + size_t j = i * mode->bitdepth; + index = readBitsFromReversedStream(&j, in, mode->bitdepth); + } + /*out of bounds of palette not checked: see lodepng_color_mode_alloc_palette.*/ + *r = mode->palette[index * 4 + 0]; + *g = mode->palette[index * 4 + 1]; + *b = mode->palette[index * 4 + 2]; + *a = mode->palette[index * 4 + 3]; + } else if(mode->colortype == LCT_GREY_ALPHA) { + if(mode->bitdepth == 8) { + *r = *g = *b = in[i * 2 + 0]; + *a = in[i * 2 + 1]; + } else { + *r = *g = *b = in[i * 4 + 0]; + *a = in[i * 4 + 2]; + } + } else if(mode->colortype == LCT_RGBA) { + if(mode->bitdepth == 8) { + *r = in[i * 4 + 0]; + *g = in[i * 4 + 1]; + *b = in[i * 4 + 2]; + *a = in[i * 4 + 3]; + } else { + *r = in[i * 8 + 0]; + *g = in[i * 8 + 2]; + *b = in[i * 8 + 4]; + *a = in[i * 8 + 6]; + } + } +} + +/*Similar to getPixelColorRGBA8, but with all the for loops inside of the color +mode test cases, optimized to convert the colors much faster, when converting +to the common case of RGBA with 8 bit per channel. buffer must be RGBA with +enough memory.*/ +static void getPixelColorsRGBA8(unsigned char* LODEPNG_RESTRICT buffer, size_t numpixels, + const unsigned char* LODEPNG_RESTRICT in, + const LodePNGColorMode* mode) { + unsigned num_channels = 4; + size_t i; + if(mode->colortype == LCT_GREY) { + if(mode->bitdepth == 8) { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + buffer[0] = buffer[1] = buffer[2] = in[i]; + buffer[3] = 255; + } + if(mode->key_defined) { + buffer -= numpixels * num_channels; + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + if(buffer[0] == mode->key_r) buffer[3] = 0; + } + } + } else if(mode->bitdepth == 16) { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + buffer[0] = buffer[1] = buffer[2] = in[i * 2]; + buffer[3] = mode->key_defined && 256U * in[i * 2 + 0] + in[i * 2 + 1] == mode->key_r ? 0 : 255; + } + } else { + unsigned highest = ((1U << mode->bitdepth) - 1U); /*highest possible value for this bit depth*/ + size_t j = 0; + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + unsigned value = readBitsFromReversedStream(&j, in, mode->bitdepth); + buffer[0] = buffer[1] = buffer[2] = (value * 255) / highest; + buffer[3] = mode->key_defined && value == mode->key_r ? 0 : 255; + } + } + } else if(mode->colortype == LCT_RGB) { + if(mode->bitdepth == 8) { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + lodepng_memcpy(buffer, &in[i * 3], 3); + buffer[3] = 255; + } + if(mode->key_defined) { + buffer -= numpixels * num_channels; + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + if(buffer[0] == mode->key_r && buffer[1]== mode->key_g && buffer[2] == mode->key_b) buffer[3] = 0; + } + } + } else { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + buffer[0] = in[i * 6 + 0]; + buffer[1] = in[i * 6 + 2]; + buffer[2] = in[i * 6 + 4]; + buffer[3] = mode->key_defined + && 256U * in[i * 6 + 0] + in[i * 6 + 1] == mode->key_r + && 256U * in[i * 6 + 2] + in[i * 6 + 3] == mode->key_g + && 256U * in[i * 6 + 4] + in[i * 6 + 5] == mode->key_b ? 0 : 255; + } + } + } else if(mode->colortype == LCT_PALETTE) { + if(mode->bitdepth == 8) { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + unsigned index = in[i]; + /*out of bounds of palette not checked: see lodepng_color_mode_alloc_palette.*/ + lodepng_memcpy(buffer, &mode->palette[index * 4], 4); + } + } else { + size_t j = 0; + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + unsigned index = readBitsFromReversedStream(&j, in, mode->bitdepth); + /*out of bounds of palette not checked: see lodepng_color_mode_alloc_palette.*/ + lodepng_memcpy(buffer, &mode->palette[index * 4], 4); + } + } + } else if(mode->colortype == LCT_GREY_ALPHA) { + if(mode->bitdepth == 8) { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + buffer[0] = buffer[1] = buffer[2] = in[i * 2 + 0]; + buffer[3] = in[i * 2 + 1]; + } + } else { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + buffer[0] = buffer[1] = buffer[2] = in[i * 4 + 0]; + buffer[3] = in[i * 4 + 2]; + } + } + } else if(mode->colortype == LCT_RGBA) { + if(mode->bitdepth == 8) { + lodepng_memcpy(buffer, in, numpixels * 4); + } else { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + buffer[0] = in[i * 8 + 0]; + buffer[1] = in[i * 8 + 2]; + buffer[2] = in[i * 8 + 4]; + buffer[3] = in[i * 8 + 6]; + } + } + } +} + +/*Similar to getPixelColorsRGBA8, but with 3-channel RGB output.*/ +static void getPixelColorsRGB8(unsigned char* LODEPNG_RESTRICT buffer, size_t numpixels, + const unsigned char* LODEPNG_RESTRICT in, + const LodePNGColorMode* mode) { + const unsigned num_channels = 3; + size_t i; + if(mode->colortype == LCT_GREY) { + if(mode->bitdepth == 8) { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + buffer[0] = buffer[1] = buffer[2] = in[i]; + } + } else if(mode->bitdepth == 16) { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + buffer[0] = buffer[1] = buffer[2] = in[i * 2]; + } + } else { + unsigned highest = ((1U << mode->bitdepth) - 1U); /*highest possible value for this bit depth*/ + size_t j = 0; + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + unsigned value = readBitsFromReversedStream(&j, in, mode->bitdepth); + buffer[0] = buffer[1] = buffer[2] = (value * 255) / highest; + } + } + } else if(mode->colortype == LCT_RGB) { + if(mode->bitdepth == 8) { + lodepng_memcpy(buffer, in, numpixels * 3); + } else { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + buffer[0] = in[i * 6 + 0]; + buffer[1] = in[i * 6 + 2]; + buffer[2] = in[i * 6 + 4]; + } + } + } else if(mode->colortype == LCT_PALETTE) { + if(mode->bitdepth == 8) { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + unsigned index = in[i]; + /*out of bounds of palette not checked: see lodepng_color_mode_alloc_palette.*/ + lodepng_memcpy(buffer, &mode->palette[index * 4], 3); + } + } else { + size_t j = 0; + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + unsigned index = readBitsFromReversedStream(&j, in, mode->bitdepth); + /*out of bounds of palette not checked: see lodepng_color_mode_alloc_palette.*/ + lodepng_memcpy(buffer, &mode->palette[index * 4], 3); + } + } + } else if(mode->colortype == LCT_GREY_ALPHA) { + if(mode->bitdepth == 8) { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + buffer[0] = buffer[1] = buffer[2] = in[i * 2 + 0]; + } + } else { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + buffer[0] = buffer[1] = buffer[2] = in[i * 4 + 0]; + } + } + } else if(mode->colortype == LCT_RGBA) { + if(mode->bitdepth == 8) { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + lodepng_memcpy(buffer, &in[i * 4], 3); + } + } else { + for(i = 0; i != numpixels; ++i, buffer += num_channels) { + buffer[0] = in[i * 8 + 0]; + buffer[1] = in[i * 8 + 2]; + buffer[2] = in[i * 8 + 4]; + } + } + } +} + +/*Get RGBA16 color of pixel with index i (y * width + x) from the raw image with +given color type, but the given color type must be 16-bit itself.*/ +static void getPixelColorRGBA16(unsigned short* r, unsigned short* g, unsigned short* b, unsigned short* a, + const unsigned char* in, size_t i, const LodePNGColorMode* mode) { + if(mode->colortype == LCT_GREY) { + *r = *g = *b = 256 * in[i * 2 + 0] + in[i * 2 + 1]; + if(mode->key_defined && 256U * in[i * 2 + 0] + in[i * 2 + 1] == mode->key_r) *a = 0; + else *a = 65535; + } else if(mode->colortype == LCT_RGB) { + *r = 256u * in[i * 6 + 0] + in[i * 6 + 1]; + *g = 256u * in[i * 6 + 2] + in[i * 6 + 3]; + *b = 256u * in[i * 6 + 4] + in[i * 6 + 5]; + if(mode->key_defined + && 256u * in[i * 6 + 0] + in[i * 6 + 1] == mode->key_r + && 256u * in[i * 6 + 2] + in[i * 6 + 3] == mode->key_g + && 256u * in[i * 6 + 4] + in[i * 6 + 5] == mode->key_b) *a = 0; + else *a = 65535; + } else if(mode->colortype == LCT_GREY_ALPHA) { + *r = *g = *b = 256u * in[i * 4 + 0] + in[i * 4 + 1]; + *a = 256u * in[i * 4 + 2] + in[i * 4 + 3]; + } else if(mode->colortype == LCT_RGBA) { + *r = 256u * in[i * 8 + 0] + in[i * 8 + 1]; + *g = 256u * in[i * 8 + 2] + in[i * 8 + 3]; + *b = 256u * in[i * 8 + 4] + in[i * 8 + 5]; + *a = 256u * in[i * 8 + 6] + in[i * 8 + 7]; + } +} + +unsigned lodepng_convert(unsigned char* out, const unsigned char* in, + const LodePNGColorMode* mode_out, const LodePNGColorMode* mode_in, + unsigned w, unsigned h) { + size_t i; + ColorTree tree; + size_t numpixels = (size_t)w * (size_t)h; + unsigned error = 0; + + if(mode_in->colortype == LCT_PALETTE && !mode_in->palette) { + return 107; /* error: must provide palette if input mode is palette */ + } + + if(lodepng_color_mode_equal(mode_out, mode_in)) { + size_t numbytes = lodepng_get_raw_size(w, h, mode_in); + lodepng_memcpy(out, in, numbytes); + return 0; + } + + if(mode_out->colortype == LCT_PALETTE) { + size_t palettesize = mode_out->palettesize; + const unsigned char* palette = mode_out->palette; + size_t palsize = (size_t)1u << mode_out->bitdepth; + /*if the user specified output palette but did not give the values, assume + they want the values of the input color type (assuming that one is palette). + Note that we never create a new palette ourselves.*/ + if(palettesize == 0) { + palettesize = mode_in->palettesize; + palette = mode_in->palette; + /*if the input was also palette with same bitdepth, then the color types are also + equal, so copy literally. This to preserve the exact indices that were in the PNG + even in case there are duplicate colors in the palette.*/ + if(mode_in->colortype == LCT_PALETTE && mode_in->bitdepth == mode_out->bitdepth) { + size_t numbytes = lodepng_get_raw_size(w, h, mode_in); + lodepng_memcpy(out, in, numbytes); + return 0; + } + } + if(palettesize < palsize) palsize = palettesize; + color_tree_init(&tree); + for(i = 0; i != palsize; ++i) { + const unsigned char* p = &palette[i * 4]; + error = color_tree_add(&tree, p[0], p[1], p[2], p[3], (unsigned)i); + if(error) break; + } + } + + if(!error) { + if(mode_in->bitdepth == 16 && mode_out->bitdepth == 16) { + for(i = 0; i != numpixels; ++i) { + unsigned short r = 0, g = 0, b = 0, a = 0; + getPixelColorRGBA16(&r, &g, &b, &a, in, i, mode_in); + rgba16ToPixel(out, i, mode_out, r, g, b, a); + } + } else if(mode_out->bitdepth == 8 && mode_out->colortype == LCT_RGBA) { + getPixelColorsRGBA8(out, numpixels, in, mode_in); + } else if(mode_out->bitdepth == 8 && mode_out->colortype == LCT_RGB) { + getPixelColorsRGB8(out, numpixels, in, mode_in); + } else { + unsigned char r = 0, g = 0, b = 0, a = 0; + for(i = 0; i != numpixels; ++i) { + getPixelColorRGBA8(&r, &g, &b, &a, in, i, mode_in); + error = rgba8ToPixel(out, i, mode_out, &tree, r, g, b, a); + if(error) break; + } + } + } + + if(mode_out->colortype == LCT_PALETTE) { + color_tree_cleanup(&tree); + } + + return error; +} + + +/* Converts a single rgb color without alpha from one type to another, color bits truncated to +their bitdepth. In case of single channel (gray or palette), only the r channel is used. Slow +function, do not use to process all pixels of an image. Alpha channel not supported on purpose: +this is for bKGD, supporting alpha may prevent it from finding a color in the palette, from the +specification it looks like bKGD should ignore the alpha values of the palette since it can use +any palette index but doesn't have an alpha channel. Idem with ignoring color key. */ +unsigned lodepng_convert_rgb( + unsigned* r_out, unsigned* g_out, unsigned* b_out, + unsigned r_in, unsigned g_in, unsigned b_in, + const LodePNGColorMode* mode_out, const LodePNGColorMode* mode_in) { + unsigned r = 0, g = 0, b = 0; + unsigned mul = 65535 / ((1u << mode_in->bitdepth) - 1u); /*65535, 21845, 4369, 257, 1*/ + unsigned shift = 16 - mode_out->bitdepth; + + if(mode_in->colortype == LCT_GREY || mode_in->colortype == LCT_GREY_ALPHA) { + r = g = b = r_in * mul; + } else if(mode_in->colortype == LCT_RGB || mode_in->colortype == LCT_RGBA) { + r = r_in * mul; + g = g_in * mul; + b = b_in * mul; + } else if(mode_in->colortype == LCT_PALETTE) { + if(r_in >= mode_in->palettesize) return 82; + r = mode_in->palette[r_in * 4 + 0] * 257u; + g = mode_in->palette[r_in * 4 + 1] * 257u; + b = mode_in->palette[r_in * 4 + 2] * 257u; + } else { + return 31; + } + + /* now convert to output format */ + if(mode_out->colortype == LCT_GREY || mode_out->colortype == LCT_GREY_ALPHA) { + *r_out = r >> shift ; + } else if(mode_out->colortype == LCT_RGB || mode_out->colortype == LCT_RGBA) { + *r_out = r >> shift ; + *g_out = g >> shift ; + *b_out = b >> shift ; + } else if(mode_out->colortype == LCT_PALETTE) { + unsigned i; + /* a 16-bit color cannot be in the palette */ + if((r >> 8) != (r & 255) || (g >> 8) != (g & 255) || (b >> 8) != (b & 255)) return 82; + for(i = 0; i < mode_out->palettesize; i++) { + unsigned j = i * 4; + if((r >> 8) == mode_out->palette[j + 0] && (g >> 8) == mode_out->palette[j + 1] && + (b >> 8) == mode_out->palette[j + 2]) { + *r_out = i; + return 0; + } + } + return 82; + } else { + return 31; + } + + return 0; +} + +#ifdef LODEPNG_COMPILE_ENCODER + +void lodepng_color_stats_init(LodePNGColorStats* stats) { + /*stats*/ + stats->colored = 0; + stats->key = 0; + stats->key_r = stats->key_g = stats->key_b = 0; + stats->alpha = 0; + stats->numcolors = 0; + stats->bits = 1; + stats->numpixels = 0; + /*settings*/ + stats->allow_palette = 1; + stats->allow_greyscale = 1; +} + +/*function used for debug purposes with C++*/ +/*void printColorStats(LodePNGColorStats* p) { + std::cout << "colored: " << (int)p->colored << ", "; + std::cout << "key: " << (int)p->key << ", "; + std::cout << "key_r: " << (int)p->key_r << ", "; + std::cout << "key_g: " << (int)p->key_g << ", "; + std::cout << "key_b: " << (int)p->key_b << ", "; + std::cout << "alpha: " << (int)p->alpha << ", "; + std::cout << "numcolors: " << (int)p->numcolors << ", "; + std::cout << "bits: " << (int)p->bits << std::endl; +}*/ + +/*Returns how many bits needed to represent given value (max 8 bit)*/ +static unsigned getValueRequiredBits(unsigned char value) { + if(value == 0 || value == 255) return 1; + /*The scaling of 2-bit and 4-bit values uses multiples of 85 and 17*/ + if(value % 17 == 0) return value % 85 == 0 ? 2 : 4; + return 8; +} + +/*stats must already have been inited. */ +unsigned lodepng_compute_color_stats(LodePNGColorStats* stats, + const unsigned char* in, unsigned w, unsigned h, + const LodePNGColorMode* mode_in) { + size_t i; + ColorTree tree; + size_t numpixels = (size_t)w * (size_t)h; + unsigned error = 0; + + /* mark things as done already if it would be impossible to have a more expensive case */ + unsigned colored_done = lodepng_is_greyscale_type(mode_in) ? 1 : 0; + unsigned alpha_done = lodepng_can_have_alpha(mode_in) ? 0 : 1; + unsigned numcolors_done = 0; + unsigned bpp = lodepng_get_bpp(mode_in); + unsigned bits_done = (stats->bits == 1 && bpp == 1) ? 1 : 0; + unsigned sixteen = 0; /* whether the input image is 16 bit */ + unsigned maxnumcolors = 257; + if(bpp <= 8) maxnumcolors = LODEPNG_MIN(257, stats->numcolors + (1u << bpp)); + + stats->numpixels += numpixels; + + /*if palette not allowed, no need to compute numcolors*/ + if(!stats->allow_palette) numcolors_done = 1; + + color_tree_init(&tree); + + /*If the stats was already filled in from previous data, fill its palette in tree + and mark things as done already if we know they are the most expensive case already*/ + if(stats->alpha) alpha_done = 1; + if(stats->colored) colored_done = 1; + if(stats->bits == 16) numcolors_done = 1; + if(stats->bits >= bpp) bits_done = 1; + if(stats->numcolors >= maxnumcolors) numcolors_done = 1; + + if(!numcolors_done) { + for(i = 0; i < stats->numcolors; i++) { + const unsigned char* color = &stats->palette[i * 4]; + error = color_tree_add(&tree, color[0], color[1], color[2], color[3], i); + if(error) goto cleanup; + } + } + + /*Check if the 16-bit input is truly 16-bit*/ + if(mode_in->bitdepth == 16 && !sixteen) { + unsigned short r = 0, g = 0, b = 0, a = 0; + for(i = 0; i != numpixels; ++i) { + getPixelColorRGBA16(&r, &g, &b, &a, in, i, mode_in); + if((r & 255) != ((r >> 8) & 255) || (g & 255) != ((g >> 8) & 255) || + (b & 255) != ((b >> 8) & 255) || (a & 255) != ((a >> 8) & 255)) /*first and second byte differ*/ { + stats->bits = 16; + sixteen = 1; + bits_done = 1; + numcolors_done = 1; /*counting colors no longer useful, palette doesn't support 16-bit*/ + break; + } + } + } + + if(sixteen) { + unsigned short r = 0, g = 0, b = 0, a = 0; + + for(i = 0; i != numpixels; ++i) { + getPixelColorRGBA16(&r, &g, &b, &a, in, i, mode_in); + + if(!colored_done && (r != g || r != b)) { + stats->colored = 1; + colored_done = 1; + } + + if(!alpha_done) { + unsigned matchkey = (r == stats->key_r && g == stats->key_g && b == stats->key_b); + if(a != 65535 && (a != 0 || (stats->key && !matchkey))) { + stats->alpha = 1; + stats->key = 0; + alpha_done = 1; + } else if(a == 0 && !stats->alpha && !stats->key) { + stats->key = 1; + stats->key_r = r; + stats->key_g = g; + stats->key_b = b; + } else if(a == 65535 && stats->key && matchkey) { + /* Color key cannot be used if an opaque pixel also has that RGB color. */ + stats->alpha = 1; + stats->key = 0; + alpha_done = 1; + } + } + if(alpha_done && numcolors_done && colored_done && bits_done) break; + } + + if(stats->key && !stats->alpha) { + for(i = 0; i != numpixels; ++i) { + getPixelColorRGBA16(&r, &g, &b, &a, in, i, mode_in); + if(a != 0 && r == stats->key_r && g == stats->key_g && b == stats->key_b) { + /* Color key cannot be used if an opaque pixel also has that RGB color. */ + stats->alpha = 1; + stats->key = 0; + alpha_done = 1; + } + } + } + } else /* < 16-bit */ { + unsigned char r = 0, g = 0, b = 0, a = 0; + for(i = 0; i != numpixels; ++i) { + getPixelColorRGBA8(&r, &g, &b, &a, in, i, mode_in); + + if(!bits_done && stats->bits < 8) { + /*only r is checked, < 8 bits is only relevant for grayscale*/ + unsigned bits = getValueRequiredBits(r); + if(bits > stats->bits) stats->bits = bits; + } + bits_done = (stats->bits >= bpp); + + if(!colored_done && (r != g || r != b)) { + stats->colored = 1; + colored_done = 1; + if(stats->bits < 8) stats->bits = 8; /*PNG has no colored modes with less than 8-bit per channel*/ + } + + if(!alpha_done) { + unsigned matchkey = (r == stats->key_r && g == stats->key_g && b == stats->key_b); + if(a != 255 && (a != 0 || (stats->key && !matchkey))) { + stats->alpha = 1; + stats->key = 0; + alpha_done = 1; + if(stats->bits < 8) stats->bits = 8; /*PNG has no alphachannel modes with less than 8-bit per channel*/ + } else if(a == 0 && !stats->alpha && !stats->key) { + stats->key = 1; + stats->key_r = r; + stats->key_g = g; + stats->key_b = b; + } else if(a == 255 && stats->key && matchkey) { + /* Color key cannot be used if an opaque pixel also has that RGB color. */ + stats->alpha = 1; + stats->key = 0; + alpha_done = 1; + if(stats->bits < 8) stats->bits = 8; /*PNG has no alphachannel modes with less than 8-bit per channel*/ + } + } + + if(!numcolors_done) { + if(!color_tree_has(&tree, r, g, b, a)) { + error = color_tree_add(&tree, r, g, b, a, stats->numcolors); + if(error) goto cleanup; + if(stats->numcolors < 256) { + unsigned char* p = stats->palette; + unsigned n = stats->numcolors; + p[n * 4 + 0] = r; + p[n * 4 + 1] = g; + p[n * 4 + 2] = b; + p[n * 4 + 3] = a; + } + ++stats->numcolors; + numcolors_done = stats->numcolors >= maxnumcolors; + } + } + + if(alpha_done && numcolors_done && colored_done && bits_done) break; + } + + if(stats->key && !stats->alpha) { + for(i = 0; i != numpixels; ++i) { + getPixelColorRGBA8(&r, &g, &b, &a, in, i, mode_in); + if(a != 0 && r == stats->key_r && g == stats->key_g && b == stats->key_b) { + /* Color key cannot be used if an opaque pixel also has that RGB color. */ + stats->alpha = 1; + stats->key = 0; + alpha_done = 1; + if(stats->bits < 8) stats->bits = 8; /*PNG has no alphachannel modes with less than 8-bit per channel*/ + } + } + } + + /*make the stats's key always 16-bit for consistency - repeat each byte twice*/ + stats->key_r += (stats->key_r << 8); + stats->key_g += (stats->key_g << 8); + stats->key_b += (stats->key_b << 8); + } + +cleanup: + color_tree_cleanup(&tree); + return error; +} + +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS +/*Adds a single color to the color stats. The stats must already have been inited. The color must be given as 16-bit +(with 2 bytes repeating for 8-bit and 65535 for opaque alpha channel). This function is expensive, do not call it for +all pixels of an image but only for a few additional values. */ +static unsigned lodepng_color_stats_add(LodePNGColorStats* stats, + unsigned r, unsigned g, unsigned b, unsigned a) { + unsigned error = 0; + unsigned char image[8]; + LodePNGColorMode mode; + lodepng_color_mode_init(&mode); + image[0] = r >> 8; image[1] = r; image[2] = g >> 8; image[3] = g; + image[4] = b >> 8; image[5] = b; image[6] = a >> 8; image[7] = a; + mode.bitdepth = 16; + mode.colortype = LCT_RGBA; + error = lodepng_compute_color_stats(stats, image, 1, 1, &mode); + lodepng_color_mode_cleanup(&mode); + return error; +} +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + +/*Computes a minimal PNG color model that can contain all colors as indicated by the stats. +The stats should be computed with lodepng_compute_color_stats. +mode_in is raw color profile of the image the stats were computed on, to copy palette order from when relevant. +Minimal PNG color model means the color type and bit depth that gives smallest amount of bits in the output image, +e.g. gray if only grayscale pixels, palette if less than 256 colors, color key if only single transparent color, ... +This is used if auto_convert is enabled (it is by default). +*/ +static unsigned auto_choose_color(LodePNGColorMode* mode_out, + const LodePNGColorMode* mode_in, + const LodePNGColorStats* stats) { + unsigned error = 0; + unsigned palettebits; + size_t i, n; + size_t numpixels = stats->numpixels; + unsigned palette_ok, gray_ok; + + unsigned alpha = stats->alpha; + unsigned key = stats->key; + unsigned bits = stats->bits; + + mode_out->key_defined = 0; + + if(key && numpixels <= 16) { + alpha = 1; /*too few pixels to justify tRNS chunk overhead*/ + key = 0; + if(bits < 8) bits = 8; /*PNG has no alphachannel modes with less than 8-bit per channel*/ + } + + gray_ok = !stats->colored; + if(!stats->allow_greyscale) gray_ok = 0; + if(!gray_ok && bits < 8) bits = 8; + + n = stats->numcolors; + palettebits = n <= 2 ? 1 : (n <= 4 ? 2 : (n <= 16 ? 4 : 8)); + palette_ok = n <= 256 && bits <= 8 && n != 0; /*n==0 means likely numcolors wasn't computed*/ + if(numpixels < n * 2) palette_ok = 0; /*don't add palette overhead if image has only a few pixels*/ + if(gray_ok && !alpha && bits <= palettebits) palette_ok = 0; /*gray is less overhead*/ + if(!stats->allow_palette) palette_ok = 0; + + if(palette_ok) { + const unsigned char* p = stats->palette; + lodepng_palette_clear(mode_out); /*remove potential earlier palette*/ + for(i = 0; i != stats->numcolors; ++i) { + error = lodepng_palette_add(mode_out, p[i * 4 + 0], p[i * 4 + 1], p[i * 4 + 2], p[i * 4 + 3]); + if(error) break; + } + + mode_out->colortype = LCT_PALETTE; + mode_out->bitdepth = palettebits; + + if(mode_in->colortype == LCT_PALETTE && mode_in->palettesize >= mode_out->palettesize + && mode_in->bitdepth == mode_out->bitdepth) { + /*If input should have same palette colors, keep original to preserve its order and prevent conversion*/ + lodepng_color_mode_cleanup(mode_out); /*clears palette, keeps the above set colortype and bitdepth fields as-is*/ + lodepng_color_mode_copy(mode_out, mode_in); + } + } else /*8-bit or 16-bit per channel*/ { + mode_out->bitdepth = bits; + mode_out->colortype = alpha ? (gray_ok ? LCT_GREY_ALPHA : LCT_RGBA) + : (gray_ok ? LCT_GREY : LCT_RGB); + if(key) { + unsigned mask = (1u << mode_out->bitdepth) - 1u; /*stats always uses 16-bit, mask converts it*/ + mode_out->key_r = stats->key_r & mask; + mode_out->key_g = stats->key_g & mask; + mode_out->key_b = stats->key_b & mask; + mode_out->key_defined = 1; + } + } + + return error; +} + +#endif /* #ifdef LODEPNG_COMPILE_ENCODER */ + +/* +Paeth predictor, used by PNG filter type 4 +The parameters are of type short, but should come from unsigned chars, the shorts +are only needed to make the paeth calculation correct. +*/ +static unsigned char paethPredictor(short a, short b, short c) { + short pa = LODEPNG_ABS(b - c); + short pb = LODEPNG_ABS(a - c); + short pc = LODEPNG_ABS(a + b - c - c); + /* return input value associated with smallest of pa, pb, pc (with certain priority if equal) */ + if(pb < pa) { a = b; pa = pb; } + return (pc < pa) ? c : a; +} + +/*shared values used by multiple Adam7 related functions*/ + +static const unsigned ADAM7_IX[7] = { 0, 4, 0, 2, 0, 1, 0 }; /*x start values*/ +static const unsigned ADAM7_IY[7] = { 0, 0, 4, 0, 2, 0, 1 }; /*y start values*/ +static const unsigned ADAM7_DX[7] = { 8, 8, 4, 4, 2, 2, 1 }; /*x delta values*/ +static const unsigned ADAM7_DY[7] = { 8, 8, 8, 4, 4, 2, 2 }; /*y delta values*/ + +/* +Outputs various dimensions and positions in the image related to the Adam7 reduced images. +passw: output containing the width of the 7 passes +passh: output containing the height of the 7 passes +filter_passstart: output containing the index of the start and end of each + reduced image with filter bytes +padded_passstart output containing the index of the start and end of each + reduced image when without filter bytes but with padded scanlines +passstart: output containing the index of the start and end of each reduced + image without padding between scanlines, but still padding between the images +w, h: width and height of non-interlaced image +bpp: bits per pixel +"padded" is only relevant if bpp is less than 8 and a scanline or image does not + end at a full byte +*/ +static void Adam7_getpassvalues(unsigned passw[7], unsigned passh[7], size_t filter_passstart[8], + size_t padded_passstart[8], size_t passstart[8], unsigned w, unsigned h, unsigned bpp) { + /*the passstart values have 8 values: the 8th one indicates the byte after the end of the 7th (= last) pass*/ + unsigned i; + + /*calculate width and height in pixels of each pass*/ + for(i = 0; i != 7; ++i) { + passw[i] = (w + ADAM7_DX[i] - ADAM7_IX[i] - 1) / ADAM7_DX[i]; + passh[i] = (h + ADAM7_DY[i] - ADAM7_IY[i] - 1) / ADAM7_DY[i]; + if(passw[i] == 0) passh[i] = 0; + if(passh[i] == 0) passw[i] = 0; + } + + filter_passstart[0] = padded_passstart[0] = passstart[0] = 0; + for(i = 0; i != 7; ++i) { + /*if passw[i] is 0, it's 0 bytes, not 1 (no filtertype-byte)*/ + filter_passstart[i + 1] = filter_passstart[i] + + ((passw[i] && passh[i]) ? passh[i] * (1u + (passw[i] * bpp + 7u) / 8u) : 0); + /*bits padded if needed to fill full byte at end of each scanline*/ + padded_passstart[i + 1] = padded_passstart[i] + passh[i] * ((passw[i] * bpp + 7u) / 8u); + /*only padded at end of reduced image*/ + passstart[i + 1] = passstart[i] + (passh[i] * passw[i] * bpp + 7u) / 8u; + } +} + +#ifdef LODEPNG_COMPILE_DECODER + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / PNG Decoder / */ +/* ////////////////////////////////////////////////////////////////////////// */ + +/*read the information from the header and store it in the LodePNGInfo. return value is error*/ +unsigned lodepng_inspect(unsigned* w, unsigned* h, LodePNGState* state, + const unsigned char* in, size_t insize) { + unsigned width, height; + LodePNGInfo* info = &state->info_png; + if(insize == 0 || in == 0) { + CERROR_RETURN_ERROR(state->error, 48); /*error: the given data is empty*/ + } + if(insize < 33) { + CERROR_RETURN_ERROR(state->error, 27); /*error: the data length is smaller than the length of a PNG header*/ + } + + /*when decoding a new PNG image, make sure all parameters created after previous decoding are reset*/ + /* TODO: remove this. One should use a new LodePNGState for new sessions */ + lodepng_info_cleanup(info); + lodepng_info_init(info); + + if(in[0] != 137 || in[1] != 80 || in[2] != 78 || in[3] != 71 + || in[4] != 13 || in[5] != 10 || in[6] != 26 || in[7] != 10) { + CERROR_RETURN_ERROR(state->error, 28); /*error: the first 8 bytes are not the correct PNG signature*/ + } + if(lodepng_chunk_length(in + 8) != 13) { + CERROR_RETURN_ERROR(state->error, 94); /*error: header size must be 13 bytes*/ + } + if(!lodepng_chunk_type_equals(in + 8, "IHDR")) { + CERROR_RETURN_ERROR(state->error, 29); /*error: it doesn't start with a IHDR chunk!*/ + } + + /*read the values given in the header*/ + width = lodepng_read32bitInt(&in[16]); + height = lodepng_read32bitInt(&in[20]); + /*TODO: remove the undocumented feature that allows to give null pointers to width or height*/ + if(w) *w = width; + if(h) *h = height; + info->color.bitdepth = in[24]; + info->color.colortype = (LodePNGColorType)in[25]; + info->compression_method = in[26]; + info->filter_method = in[27]; + info->interlace_method = in[28]; + + /*errors returned only after the parsing so other values are still output*/ + + /*error: invalid image size*/ + if(width == 0 || height == 0) CERROR_RETURN_ERROR(state->error, 93); + /*error: invalid colortype or bitdepth combination*/ + state->error = checkColorValidity(info->color.colortype, info->color.bitdepth); + if(state->error) return state->error; + /*error: only compression method 0 is allowed in the specification*/ + if(info->compression_method != 0) CERROR_RETURN_ERROR(state->error, 32); + /*error: only filter method 0 is allowed in the specification*/ + if(info->filter_method != 0) CERROR_RETURN_ERROR(state->error, 33); + /*error: only interlace methods 0 and 1 exist in the specification*/ + if(info->interlace_method > 1) CERROR_RETURN_ERROR(state->error, 34); + + if(!state->decoder.ignore_crc) { + unsigned CRC = lodepng_read32bitInt(&in[29]); + unsigned checksum = lodepng_crc32(&in[12], 17); + if(CRC != checksum) { + CERROR_RETURN_ERROR(state->error, 57); /*invalid CRC*/ + } + } + + return state->error; +} + +static unsigned unfilterScanline(unsigned char* recon, const unsigned char* scanline, const unsigned char* precon, + size_t bytewidth, unsigned char filterType, size_t length) { + /* + For PNG filter method 0 + unfilter a PNG image scanline by scanline. when the pixels are smaller than 1 byte, + the filter works byte per byte (bytewidth = 1) + precon is the previous unfiltered scanline, recon the result, scanline the current one + the incoming scanlines do NOT include the filtertype byte, that one is given in the parameter filterType instead + recon and scanline MAY be the same memory address! precon must be disjoint. + */ + + size_t i; + switch(filterType) { + case 0: + for(i = 0; i != length; ++i) recon[i] = scanline[i]; + break; + case 1: { + size_t j = 0; + for(i = 0; i != bytewidth; ++i) recon[i] = scanline[i]; + for(i = bytewidth; i != length; ++i, ++j) recon[i] = scanline[i] + recon[j]; + break; + } + case 2: + if(precon) { + for(i = 0; i != length; ++i) recon[i] = scanline[i] + precon[i]; + } else { + for(i = 0; i != length; ++i) recon[i] = scanline[i]; + } + break; + case 3: + if(precon) { + size_t j = 0; + for(i = 0; i != bytewidth; ++i) recon[i] = scanline[i] + (precon[i] >> 1u); + /* Unroll independent paths of this predictor. A 6x and 8x version is also possible but that adds + too much code. Whether this speeds up anything depends on compiler and settings. */ + if(bytewidth >= 4) { + for(; i + 3 < length; i += 4, j += 4) { + unsigned char s0 = scanline[i + 0], s1 = scanline[i + 1], s2 = scanline[i + 2], s3 = scanline[i + 3]; + unsigned char r0 = recon[j + 0], r1 = recon[j + 1], r2 = recon[j + 2], r3 = recon[j + 3]; + unsigned char p0 = precon[i + 0], p1 = precon[i + 1], p2 = precon[i + 2], p3 = precon[i + 3]; + recon[i + 0] = s0 + ((r0 + p0) >> 1u); + recon[i + 1] = s1 + ((r1 + p1) >> 1u); + recon[i + 2] = s2 + ((r2 + p2) >> 1u); + recon[i + 3] = s3 + ((r3 + p3) >> 1u); + } + } else if(bytewidth >= 3) { + for(; i + 2 < length; i += 3, j += 3) { + unsigned char s0 = scanline[i + 0], s1 = scanline[i + 1], s2 = scanline[i + 2]; + unsigned char r0 = recon[j + 0], r1 = recon[j + 1], r2 = recon[j + 2]; + unsigned char p0 = precon[i + 0], p1 = precon[i + 1], p2 = precon[i + 2]; + recon[i + 0] = s0 + ((r0 + p0) >> 1u); + recon[i + 1] = s1 + ((r1 + p1) >> 1u); + recon[i + 2] = s2 + ((r2 + p2) >> 1u); + } + } else if(bytewidth >= 2) { + for(; i + 1 < length; i += 2, j += 2) { + unsigned char s0 = scanline[i + 0], s1 = scanline[i + 1]; + unsigned char r0 = recon[j + 0], r1 = recon[j + 1]; + unsigned char p0 = precon[i + 0], p1 = precon[i + 1]; + recon[i + 0] = s0 + ((r0 + p0) >> 1u); + recon[i + 1] = s1 + ((r1 + p1) >> 1u); + } + } + for(; i != length; ++i, ++j) recon[i] = scanline[i] + ((recon[j] + precon[i]) >> 1u); + } else { + size_t j = 0; + for(i = 0; i != bytewidth; ++i) recon[i] = scanline[i]; + for(i = bytewidth; i != length; ++i, ++j) recon[i] = scanline[i] + (recon[j] >> 1u); + } + break; + case 4: + if(precon) { + size_t j = 0; + for(i = 0; i != bytewidth; ++i) { + recon[i] = (scanline[i] + precon[i]); /*paethPredictor(0, precon[i], 0) is always precon[i]*/ + } + + /* Unroll independent paths of the paeth predictor. A 6x and 8x version is also possible but that + adds too much code. Whether this speeds up anything depends on compiler and settings. */ + if(bytewidth >= 4) { + for(; i + 3 < length; i += 4, j += 4) { + unsigned char s0 = scanline[i + 0], s1 = scanline[i + 1], s2 = scanline[i + 2], s3 = scanline[i + 3]; + unsigned char r0 = recon[j + 0], r1 = recon[j + 1], r2 = recon[j + 2], r3 = recon[j + 3]; + unsigned char p0 = precon[i + 0], p1 = precon[i + 1], p2 = precon[i + 2], p3 = precon[i + 3]; + unsigned char q0 = precon[j + 0], q1 = precon[j + 1], q2 = precon[j + 2], q3 = precon[j + 3]; + recon[i + 0] = s0 + paethPredictor(r0, p0, q0); + recon[i + 1] = s1 + paethPredictor(r1, p1, q1); + recon[i + 2] = s2 + paethPredictor(r2, p2, q2); + recon[i + 3] = s3 + paethPredictor(r3, p3, q3); + } + } else if(bytewidth >= 3) { + for(; i + 2 < length; i += 3, j += 3) { + unsigned char s0 = scanline[i + 0], s1 = scanline[i + 1], s2 = scanline[i + 2]; + unsigned char r0 = recon[j + 0], r1 = recon[j + 1], r2 = recon[j + 2]; + unsigned char p0 = precon[i + 0], p1 = precon[i + 1], p2 = precon[i + 2]; + unsigned char q0 = precon[j + 0], q1 = precon[j + 1], q2 = precon[j + 2]; + recon[i + 0] = s0 + paethPredictor(r0, p0, q0); + recon[i + 1] = s1 + paethPredictor(r1, p1, q1); + recon[i + 2] = s2 + paethPredictor(r2, p2, q2); + } + } else if(bytewidth >= 2) { + for(; i + 1 < length; i += 2, j += 2) { + unsigned char s0 = scanline[i + 0], s1 = scanline[i + 1]; + unsigned char r0 = recon[j + 0], r1 = recon[j + 1]; + unsigned char p0 = precon[i + 0], p1 = precon[i + 1]; + unsigned char q0 = precon[j + 0], q1 = precon[j + 1]; + recon[i + 0] = s0 + paethPredictor(r0, p0, q0); + recon[i + 1] = s1 + paethPredictor(r1, p1, q1); + } + } + + for(; i != length; ++i, ++j) { + recon[i] = (scanline[i] + paethPredictor(recon[i - bytewidth], precon[i], precon[j])); + } + } else { + size_t j = 0; + for(i = 0; i != bytewidth; ++i) { + recon[i] = scanline[i]; + } + for(i = bytewidth; i != length; ++i, ++j) { + /*paethPredictor(recon[i - bytewidth], 0, 0) is always recon[i - bytewidth]*/ + recon[i] = (scanline[i] + recon[j]); + } + } + break; + default: return 36; /*error: invalid filter type given*/ + } + return 0; +} + +static unsigned unfilter(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) { + /* + For PNG filter method 0 + this function unfilters a single image (e.g. without interlacing this is called once, with Adam7 seven times) + out must have enough bytes allocated already, in must have the scanlines + 1 filtertype byte per scanline + w and h are image dimensions or dimensions of reduced image, bpp is bits per pixel + in and out are allowed to be the same memory address (but aren't the same size since in has the extra filter bytes) + */ + + unsigned y; + unsigned char* prevline = 0; + + /*bytewidth is used for filtering, is 1 when bpp < 8, number of bytes per pixel otherwise*/ + size_t bytewidth = (bpp + 7u) / 8u; + /*the width of a scanline in bytes, not including the filter type*/ + size_t linebytes = lodepng_get_raw_size_idat(w, 1, bpp) - 1u; + + for(y = 0; y < h; ++y) { + size_t outindex = linebytes * y; + size_t inindex = (1 + linebytes) * y; /*the extra filterbyte added to each row*/ + unsigned char filterType = in[inindex]; + + CERROR_TRY_RETURN(unfilterScanline(&out[outindex], &in[inindex + 1], prevline, bytewidth, filterType, linebytes)); + + prevline = &out[outindex]; + } + + return 0; +} + +/* +in: Adam7 interlaced image, with no padding bits between scanlines, but between + reduced images so that each reduced image starts at a byte. +out: the same pixels, but re-ordered so that they're now a non-interlaced image with size w*h +bpp: bits per pixel +out has the following size in bits: w * h * bpp. +in is possibly bigger due to padding bits between reduced images. +out must be big enough AND must be 0 everywhere if bpp < 8 in the current implementation +(because that's likely a little bit faster) +NOTE: comments about padding bits are only relevant if bpp < 8 +*/ +static void Adam7_deinterlace(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) { + unsigned passw[7], passh[7]; + size_t filter_passstart[8], padded_passstart[8], passstart[8]; + unsigned i; + + Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp); + + if(bpp >= 8) { + for(i = 0; i != 7; ++i) { + unsigned x, y, b; + size_t bytewidth = bpp / 8u; + for(y = 0; y < passh[i]; ++y) + for(x = 0; x < passw[i]; ++x) { + size_t pixelinstart = passstart[i] + (y * passw[i] + x) * bytewidth; + size_t pixeloutstart = ((ADAM7_IY[i] + (size_t)y * ADAM7_DY[i]) * (size_t)w + + ADAM7_IX[i] + (size_t)x * ADAM7_DX[i]) * bytewidth; + for(b = 0; b < bytewidth; ++b) { + out[pixeloutstart + b] = in[pixelinstart + b]; + } + } + } + } else /*bpp < 8: Adam7 with pixels < 8 bit is a bit trickier: with bit pointers*/ { + for(i = 0; i != 7; ++i) { + unsigned x, y, b; + unsigned ilinebits = bpp * passw[i]; + unsigned olinebits = bpp * w; + size_t obp, ibp; /*bit pointers (for out and in buffer)*/ + for(y = 0; y < passh[i]; ++y) + for(x = 0; x < passw[i]; ++x) { + ibp = (8 * passstart[i]) + (y * ilinebits + x * bpp); + obp = (ADAM7_IY[i] + (size_t)y * ADAM7_DY[i]) * olinebits + (ADAM7_IX[i] + (size_t)x * ADAM7_DX[i]) * bpp; + for(b = 0; b < bpp; ++b) { + unsigned char bit = readBitFromReversedStream(&ibp, in); + setBitOfReversedStream(&obp, out, bit); + } + } + } + } +} + +static void removePaddingBits(unsigned char* out, const unsigned char* in, + size_t olinebits, size_t ilinebits, unsigned h) { + /* + After filtering there are still padding bits if scanlines have non multiple of 8 bit amounts. They need + to be removed (except at last scanline of (Adam7-reduced) image) before working with pure image buffers + for the Adam7 code, the color convert code and the output to the user. + in and out are allowed to be the same buffer, in may also be higher but still overlapping; in must + have >= ilinebits*h bits, out must have >= olinebits*h bits, olinebits must be <= ilinebits + also used to move bits after earlier such operations happened, e.g. in a sequence of reduced images from Adam7 + only useful if (ilinebits - olinebits) is a value in the range 1..7 + */ + unsigned y; + size_t diff = ilinebits - olinebits; + size_t ibp = 0, obp = 0; /*input and output bit pointers*/ + for(y = 0; y < h; ++y) { + size_t x; + for(x = 0; x < olinebits; ++x) { + unsigned char bit = readBitFromReversedStream(&ibp, in); + setBitOfReversedStream(&obp, out, bit); + } + ibp += diff; + } +} + +/*out must be buffer big enough to contain full image, and in must contain the full decompressed data from +the IDAT chunks (with filter index bytes and possible padding bits) +return value is error*/ +static unsigned postProcessScanlines(unsigned char* out, unsigned char* in, + unsigned w, unsigned h, const LodePNGInfo* info_png) { + /* + This function converts the filtered-padded-interlaced data into pure 2D image buffer with the PNG's colortype. + Steps: + *) if no Adam7: 1) unfilter 2) remove padding bits (= possible extra bits per scanline if bpp < 8) + *) if adam7: 1) 7x unfilter 2) 7x remove padding bits 3) Adam7_deinterlace + NOTE: the in buffer will be overwritten with intermediate data! + */ + unsigned bpp = lodepng_get_bpp(&info_png->color); + if(bpp == 0) return 31; /*error: invalid colortype*/ + + if(info_png->interlace_method == 0) { + if(bpp < 8 && w * bpp != ((w * bpp + 7u) / 8u) * 8u) { + CERROR_TRY_RETURN(unfilter(in, in, w, h, bpp)); + removePaddingBits(out, in, w * bpp, ((w * bpp + 7u) / 8u) * 8u, h); + } + /*we can immediately filter into the out buffer, no other steps needed*/ + else CERROR_TRY_RETURN(unfilter(out, in, w, h, bpp)); + } else /*interlace_method is 1 (Adam7)*/ { + unsigned passw[7], passh[7]; size_t filter_passstart[8], padded_passstart[8], passstart[8]; + unsigned i; + + Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp); + + for(i = 0; i != 7; ++i) { + CERROR_TRY_RETURN(unfilter(&in[padded_passstart[i]], &in[filter_passstart[i]], passw[i], passh[i], bpp)); + /*TODO: possible efficiency improvement: if in this reduced image the bits fit nicely in 1 scanline, + move bytes instead of bits or move not at all*/ + if(bpp < 8) { + /*remove padding bits in scanlines; after this there still may be padding + bits between the different reduced images: each reduced image still starts nicely at a byte*/ + removePaddingBits(&in[passstart[i]], &in[padded_passstart[i]], passw[i] * bpp, + ((passw[i] * bpp + 7u) / 8u) * 8u, passh[i]); + } + } + + Adam7_deinterlace(out, in, w, h, bpp); + } + + return 0; +} + +static unsigned readChunk_PLTE(LodePNGColorMode* color, const unsigned char* data, size_t chunkLength) { + unsigned pos = 0, i; + color->palettesize = chunkLength / 3u; + if(color->palettesize == 0 || color->palettesize > 256) return 38; /*error: palette too small or big*/ + lodepng_color_mode_alloc_palette(color); + if(!color->palette && color->palettesize) { + color->palettesize = 0; + return 83; /*alloc fail*/ + } + + for(i = 0; i != color->palettesize; ++i) { + color->palette[4 * i + 0] = data[pos++]; /*R*/ + color->palette[4 * i + 1] = data[pos++]; /*G*/ + color->palette[4 * i + 2] = data[pos++]; /*B*/ + color->palette[4 * i + 3] = 255; /*alpha*/ + } + + return 0; /* OK */ +} + +static unsigned readChunk_tRNS(LodePNGColorMode* color, const unsigned char* data, size_t chunkLength) { + unsigned i; + if(color->colortype == LCT_PALETTE) { + /*error: more alpha values given than there are palette entries*/ + if(chunkLength > color->palettesize) return 39; + + for(i = 0; i != chunkLength; ++i) color->palette[4 * i + 3] = data[i]; + } else if(color->colortype == LCT_GREY) { + /*error: this chunk must be 2 bytes for grayscale image*/ + if(chunkLength != 2) return 30; + + color->key_defined = 1; + color->key_r = color->key_g = color->key_b = 256u * data[0] + data[1]; + } else if(color->colortype == LCT_RGB) { + /*error: this chunk must be 6 bytes for RGB image*/ + if(chunkLength != 6) return 41; + + color->key_defined = 1; + color->key_r = 256u * data[0] + data[1]; + color->key_g = 256u * data[2] + data[3]; + color->key_b = 256u * data[4] + data[5]; + } + else return 42; /*error: tRNS chunk not allowed for other color models*/ + + return 0; /* OK */ +} + + +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS +/*background color chunk (bKGD)*/ +static unsigned readChunk_bKGD(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) { + if(info->color.colortype == LCT_PALETTE) { + /*error: this chunk must be 1 byte for indexed color image*/ + if(chunkLength != 1) return 43; + + /*error: invalid palette index, or maybe this chunk appeared before PLTE*/ + if(data[0] >= info->color.palettesize) return 103; + + info->background_defined = 1; + info->background_r = info->background_g = info->background_b = data[0]; + } else if(info->color.colortype == LCT_GREY || info->color.colortype == LCT_GREY_ALPHA) { + /*error: this chunk must be 2 bytes for grayscale image*/ + if(chunkLength != 2) return 44; + + /*the values are truncated to bitdepth in the PNG file*/ + info->background_defined = 1; + info->background_r = info->background_g = info->background_b = 256u * data[0] + data[1]; + } else if(info->color.colortype == LCT_RGB || info->color.colortype == LCT_RGBA) { + /*error: this chunk must be 6 bytes for grayscale image*/ + if(chunkLength != 6) return 45; + + /*the values are truncated to bitdepth in the PNG file*/ + info->background_defined = 1; + info->background_r = 256u * data[0] + data[1]; + info->background_g = 256u * data[2] + data[3]; + info->background_b = 256u * data[4] + data[5]; + } + + return 0; /* OK */ +} + +/*text chunk (tEXt)*/ +static unsigned readChunk_tEXt(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) { + unsigned error = 0; + char *key = 0, *str = 0; + + while(!error) /*not really a while loop, only used to break on error*/ { + unsigned length, string2_begin; + + length = 0; + while(length < chunkLength && data[length] != 0) ++length; + /*even though it's not allowed by the standard, no error is thrown if + there's no null termination char, if the text is empty*/ + if(length < 1 || length > 79) CERROR_BREAK(error, 89); /*keyword too short or long*/ + + key = (char*)lodepng_malloc(length + 1); + if(!key) CERROR_BREAK(error, 83); /*alloc fail*/ + + lodepng_memcpy(key, data, length); + key[length] = 0; + + string2_begin = length + 1; /*skip keyword null terminator*/ + + length = (unsigned)(chunkLength < string2_begin ? 0 : chunkLength - string2_begin); + str = (char*)lodepng_malloc(length + 1); + if(!str) CERROR_BREAK(error, 83); /*alloc fail*/ + + lodepng_memcpy(str, data + string2_begin, length); + str[length] = 0; + + error = lodepng_add_text(info, key, str); + + break; + } + + lodepng_free(key); + lodepng_free(str); + + return error; +} + +/*compressed text chunk (zTXt)*/ +static unsigned readChunk_zTXt(LodePNGInfo* info, const LodePNGDecoderSettings* decoder, + const unsigned char* data, size_t chunkLength) { + unsigned error = 0; + + /*copy the object to change parameters in it*/ + LodePNGDecompressSettings zlibsettings = decoder->zlibsettings; + + unsigned length, string2_begin; + char *key = 0; + unsigned char* str = 0; + size_t size = 0; + + while(!error) /*not really a while loop, only used to break on error*/ { + for(length = 0; length < chunkLength && data[length] != 0; ++length) ; + if(length + 2 >= chunkLength) CERROR_BREAK(error, 75); /*no null termination, corrupt?*/ + if(length < 1 || length > 79) CERROR_BREAK(error, 89); /*keyword too short or long*/ + + key = (char*)lodepng_malloc(length + 1); + if(!key) CERROR_BREAK(error, 83); /*alloc fail*/ + + lodepng_memcpy(key, data, length); + key[length] = 0; + + if(data[length + 1] != 0) CERROR_BREAK(error, 72); /*the 0 byte indicating compression must be 0*/ + + string2_begin = length + 2; + if(string2_begin > chunkLength) CERROR_BREAK(error, 75); /*no null termination, corrupt?*/ + + length = (unsigned)chunkLength - string2_begin; + zlibsettings.max_output_size = decoder->max_text_size; + /*will fail if zlib error, e.g. if length is too small*/ + error = zlib_decompress(&str, &size, 0, &data[string2_begin], + length, &zlibsettings); + /*error: compressed text larger than decoder->max_text_size*/ + if(error && size > zlibsettings.max_output_size) error = 112; + if(error) break; + error = lodepng_add_text_sized(info, key, (char*)str, size); + break; + } + + lodepng_free(key); + lodepng_free(str); + + return error; +} + +/*international text chunk (iTXt)*/ +static unsigned readChunk_iTXt(LodePNGInfo* info, const LodePNGDecoderSettings* decoder, + const unsigned char* data, size_t chunkLength) { + unsigned error = 0; + unsigned i; + + /*copy the object to change parameters in it*/ + LodePNGDecompressSettings zlibsettings = decoder->zlibsettings; + + unsigned length, begin, compressed; + char *key = 0, *langtag = 0, *transkey = 0; + + while(!error) /*not really a while loop, only used to break on error*/ { + /*Quick check if the chunk length isn't too small. Even without check + it'd still fail with other error checks below if it's too short. This just gives a different error code.*/ + if(chunkLength < 5) CERROR_BREAK(error, 30); /*iTXt chunk too short*/ + + /*read the key*/ + for(length = 0; length < chunkLength && data[length] != 0; ++length) ; + if(length + 3 >= chunkLength) CERROR_BREAK(error, 75); /*no null termination char, corrupt?*/ + if(length < 1 || length > 79) CERROR_BREAK(error, 89); /*keyword too short or long*/ + + key = (char*)lodepng_malloc(length + 1); + if(!key) CERROR_BREAK(error, 83); /*alloc fail*/ + + lodepng_memcpy(key, data, length); + key[length] = 0; + + /*read the compression method*/ + compressed = data[length + 1]; + if(data[length + 2] != 0) CERROR_BREAK(error, 72); /*the 0 byte indicating compression must be 0*/ + + /*even though it's not allowed by the standard, no error is thrown if + there's no null termination char, if the text is empty for the next 3 texts*/ + + /*read the langtag*/ + begin = length + 3; + length = 0; + for(i = begin; i < chunkLength && data[i] != 0; ++i) ++length; + + langtag = (char*)lodepng_malloc(length + 1); + if(!langtag) CERROR_BREAK(error, 83); /*alloc fail*/ + + lodepng_memcpy(langtag, data + begin, length); + langtag[length] = 0; + + /*read the transkey*/ + begin += length + 1; + length = 0; + for(i = begin; i < chunkLength && data[i] != 0; ++i) ++length; + + transkey = (char*)lodepng_malloc(length + 1); + if(!transkey) CERROR_BREAK(error, 83); /*alloc fail*/ + + lodepng_memcpy(transkey, data + begin, length); + transkey[length] = 0; + + /*read the actual text*/ + begin += length + 1; + + length = (unsigned)chunkLength < begin ? 0 : (unsigned)chunkLength - begin; + + if(compressed) { + unsigned char* str = 0; + size_t size = 0; + zlibsettings.max_output_size = decoder->max_text_size; + /*will fail if zlib error, e.g. if length is too small*/ + error = zlib_decompress(&str, &size, 0, &data[begin], + length, &zlibsettings); + /*error: compressed text larger than decoder->max_text_size*/ + if(error && size > zlibsettings.max_output_size) error = 112; + if(!error) error = lodepng_add_itext_sized(info, key, langtag, transkey, (char*)str, size); + lodepng_free(str); + } else { + error = lodepng_add_itext_sized(info, key, langtag, transkey, (char*)(data + begin), length); + } + + break; + } + + lodepng_free(key); + lodepng_free(langtag); + lodepng_free(transkey); + + return error; +} + +static unsigned readChunk_tIME(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) { + if(chunkLength != 7) return 73; /*invalid tIME chunk size*/ + + info->time_defined = 1; + info->time.year = 256u * data[0] + data[1]; + info->time.month = data[2]; + info->time.day = data[3]; + info->time.hour = data[4]; + info->time.minute = data[5]; + info->time.second = data[6]; + + return 0; /* OK */ +} + +static unsigned readChunk_pHYs(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) { + if(chunkLength != 9) return 74; /*invalid pHYs chunk size*/ + + info->phys_defined = 1; + info->phys_x = 16777216u * data[0] + 65536u * data[1] + 256u * data[2] + data[3]; + info->phys_y = 16777216u * data[4] + 65536u * data[5] + 256u * data[6] + data[7]; + info->phys_unit = data[8]; + + return 0; /* OK */ +} + +static unsigned readChunk_gAMA(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) { + if(chunkLength != 4) return 96; /*invalid gAMA chunk size*/ + + info->gama_defined = 1; + info->gama_gamma = 16777216u * data[0] + 65536u * data[1] + 256u * data[2] + data[3]; + + return 0; /* OK */ +} + +static unsigned readChunk_cHRM(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) { + if(chunkLength != 32) return 97; /*invalid cHRM chunk size*/ + + info->chrm_defined = 1; + info->chrm_white_x = 16777216u * data[ 0] + 65536u * data[ 1] + 256u * data[ 2] + data[ 3]; + info->chrm_white_y = 16777216u * data[ 4] + 65536u * data[ 5] + 256u * data[ 6] + data[ 7]; + info->chrm_red_x = 16777216u * data[ 8] + 65536u * data[ 9] + 256u * data[10] + data[11]; + info->chrm_red_y = 16777216u * data[12] + 65536u * data[13] + 256u * data[14] + data[15]; + info->chrm_green_x = 16777216u * data[16] + 65536u * data[17] + 256u * data[18] + data[19]; + info->chrm_green_y = 16777216u * data[20] + 65536u * data[21] + 256u * data[22] + data[23]; + info->chrm_blue_x = 16777216u * data[24] + 65536u * data[25] + 256u * data[26] + data[27]; + info->chrm_blue_y = 16777216u * data[28] + 65536u * data[29] + 256u * data[30] + data[31]; + + return 0; /* OK */ +} + +static unsigned readChunk_sRGB(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) { + if(chunkLength != 1) return 98; /*invalid sRGB chunk size (this one is never ignored)*/ + + info->srgb_defined = 1; + info->srgb_intent = data[0]; + + return 0; /* OK */ +} + +static unsigned readChunk_iCCP(LodePNGInfo* info, const LodePNGDecoderSettings* decoder, + const unsigned char* data, size_t chunkLength) { + unsigned error = 0; + unsigned i; + size_t size = 0; + /*copy the object to change parameters in it*/ + LodePNGDecompressSettings zlibsettings = decoder->zlibsettings; + + unsigned length, string2_begin; + + info->iccp_defined = 1; + if(info->iccp_name) lodepng_clear_icc(info); + + for(length = 0; length < chunkLength && data[length] != 0; ++length) ; + if(length + 2 >= chunkLength) return 75; /*no null termination, corrupt?*/ + if(length < 1 || length > 79) return 89; /*keyword too short or long*/ + + info->iccp_name = (char*)lodepng_malloc(length + 1); + if(!info->iccp_name) return 83; /*alloc fail*/ + + info->iccp_name[length] = 0; + for(i = 0; i != length; ++i) info->iccp_name[i] = (char)data[i]; + + if(data[length + 1] != 0) return 72; /*the 0 byte indicating compression must be 0*/ + + string2_begin = length + 2; + if(string2_begin > chunkLength) return 75; /*no null termination, corrupt?*/ + + length = (unsigned)chunkLength - string2_begin; + zlibsettings.max_output_size = decoder->max_icc_size; + error = zlib_decompress(&info->iccp_profile, &size, 0, + &data[string2_begin], + length, &zlibsettings); + /*error: ICC profile larger than decoder->max_icc_size*/ + if(error && size > zlibsettings.max_output_size) error = 113; + info->iccp_profile_size = size; + if(!error && !info->iccp_profile_size) error = 100; /*invalid ICC profile size*/ + return error; +} + +/*significant bits chunk (sBIT)*/ +static unsigned readChunk_sBIT(LodePNGInfo* info, const unsigned char* data, size_t chunkLength) { + unsigned bitdepth = (info->color.colortype == LCT_PALETTE) ? 8 : info->color.bitdepth; + if(info->color.colortype == LCT_GREY) { + /*error: this chunk must be 1 bytes for grayscale image*/ + if(chunkLength != 1) return 114; + if(data[0] == 0 || data[0] > bitdepth) return 115; + info->sbit_defined = 1; + info->sbit_r = info->sbit_g = info->sbit_b = data[0]; /*setting g and b is not required, but sensible*/ + } else if(info->color.colortype == LCT_RGB || info->color.colortype == LCT_PALETTE) { + /*error: this chunk must be 3 bytes for RGB and palette image*/ + if(chunkLength != 3) return 114; + if(data[0] == 0 || data[1] == 0 || data[2] == 0) return 115; + if(data[0] > bitdepth || data[1] > bitdepth || data[2] > bitdepth) return 115; + info->sbit_defined = 1; + info->sbit_r = data[0]; + info->sbit_g = data[1]; + info->sbit_b = data[2]; + } else if(info->color.colortype == LCT_GREY_ALPHA) { + /*error: this chunk must be 2 byte for grayscale with alpha image*/ + if(chunkLength != 2) return 114; + if(data[0] == 0 || data[1] == 0) return 115; + if(data[0] > bitdepth || data[1] > bitdepth) return 115; + info->sbit_defined = 1; + info->sbit_r = info->sbit_g = info->sbit_b = data[0]; /*setting g and b is not required, but sensible*/ + info->sbit_a = data[1]; + } else if(info->color.colortype == LCT_RGBA) { + /*error: this chunk must be 4 bytes for grayscale image*/ + if(chunkLength != 4) return 114; + if(data[0] == 0 || data[1] == 0 || data[2] == 0 || data[3] == 0) return 115; + if(data[0] > bitdepth || data[1] > bitdepth || data[2] > bitdepth || data[3] > bitdepth) return 115; + info->sbit_defined = 1; + info->sbit_r = data[0]; + info->sbit_g = data[1]; + info->sbit_b = data[2]; + info->sbit_a = data[3]; + } + + return 0; /* OK */ +} +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + +unsigned lodepng_inspect_chunk(LodePNGState* state, size_t pos, + const unsigned char* in, size_t insize) { + const unsigned char* chunk = in + pos; + unsigned chunkLength; + const unsigned char* data; + unsigned unhandled = 0; + unsigned error = 0; + + if(pos + 4 > insize) return 30; + chunkLength = lodepng_chunk_length(chunk); + if(chunkLength > 2147483647) return 63; + data = lodepng_chunk_data_const(chunk); + if(chunkLength + 12 > insize - pos) return 30; + + if(lodepng_chunk_type_equals(chunk, "PLTE")) { + error = readChunk_PLTE(&state->info_png.color, data, chunkLength); + } else if(lodepng_chunk_type_equals(chunk, "tRNS")) { + error = readChunk_tRNS(&state->info_png.color, data, chunkLength); +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + } else if(lodepng_chunk_type_equals(chunk, "bKGD")) { + error = readChunk_bKGD(&state->info_png, data, chunkLength); + } else if(lodepng_chunk_type_equals(chunk, "tEXt")) { + error = readChunk_tEXt(&state->info_png, data, chunkLength); + } else if(lodepng_chunk_type_equals(chunk, "zTXt")) { + error = readChunk_zTXt(&state->info_png, &state->decoder, data, chunkLength); + } else if(lodepng_chunk_type_equals(chunk, "iTXt")) { + error = readChunk_iTXt(&state->info_png, &state->decoder, data, chunkLength); + } else if(lodepng_chunk_type_equals(chunk, "tIME")) { + error = readChunk_tIME(&state->info_png, data, chunkLength); + } else if(lodepng_chunk_type_equals(chunk, "pHYs")) { + error = readChunk_pHYs(&state->info_png, data, chunkLength); + } else if(lodepng_chunk_type_equals(chunk, "gAMA")) { + error = readChunk_gAMA(&state->info_png, data, chunkLength); + } else if(lodepng_chunk_type_equals(chunk, "cHRM")) { + error = readChunk_cHRM(&state->info_png, data, chunkLength); + } else if(lodepng_chunk_type_equals(chunk, "sRGB")) { + error = readChunk_sRGB(&state->info_png, data, chunkLength); + } else if(lodepng_chunk_type_equals(chunk, "iCCP")) { + error = readChunk_iCCP(&state->info_png, &state->decoder, data, chunkLength); + } else if(lodepng_chunk_type_equals(chunk, "sBIT")) { + error = readChunk_sBIT(&state->info_png, data, chunkLength); +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + } else { + /* unhandled chunk is ok (is not an error) */ + unhandled = 1; + } + + if(!error && !unhandled && !state->decoder.ignore_crc) { + if(lodepng_chunk_check_crc(chunk)) return 57; /*invalid CRC*/ + } + + return error; +} + +/*read a PNG, the result will be in the same color type as the PNG (hence "generic")*/ +static void decodeGeneric(unsigned char** out, unsigned* w, unsigned* h, + LodePNGState* state, + const unsigned char* in, size_t insize) { + unsigned char IEND = 0; + const unsigned char* chunk; /*points to beginning of next chunk*/ + unsigned char* idat; /*the data from idat chunks, zlib compressed*/ + size_t idatsize = 0; + unsigned char* scanlines = 0; + size_t scanlines_size = 0, expected_size = 0; + size_t outsize = 0; + + /*for unknown chunk order*/ + unsigned unknown = 0; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + unsigned critical_pos = 1; /*1 = after IHDR, 2 = after PLTE, 3 = after IDAT*/ +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + + + /* safe output values in case error happens */ + *out = 0; + *w = *h = 0; + + state->error = lodepng_inspect(w, h, state, in, insize); /*reads header and resets other parameters in state->info_png*/ + if(state->error) return; + + if(lodepng_pixel_overflow(*w, *h, &state->info_png.color, &state->info_raw)) { + CERROR_RETURN(state->error, 92); /*overflow possible due to amount of pixels*/ + } + + /*the input filesize is a safe upper bound for the sum of idat chunks size*/ + idat = (unsigned char*)lodepng_malloc(insize); + if(!idat) CERROR_RETURN(state->error, 83); /*alloc fail*/ + + chunk = &in[33]; /*first byte of the first chunk after the header*/ + + /*loop through the chunks, ignoring unknown chunks and stopping at IEND chunk. + IDAT data is put at the start of the in buffer*/ + while(!IEND && !state->error) { + unsigned chunkLength; + const unsigned char* data; /*the data in the chunk*/ + size_t pos = (size_t)(chunk - in); + + /*error: next chunk out of bounds of the in buffer*/ + if(chunk < in || pos + 12 > insize) { + if(state->decoder.ignore_end) break; /*other errors may still happen though*/ + CERROR_BREAK(state->error, 30); + } + + /*length of the data of the chunk, excluding the 12 bytes for length, chunk type and CRC*/ + chunkLength = lodepng_chunk_length(chunk); + /*error: chunk length larger than the max PNG chunk size*/ + if(chunkLength > 2147483647) { + if(state->decoder.ignore_end) break; /*other errors may still happen though*/ + CERROR_BREAK(state->error, 63); + } + + if(pos + (size_t)chunkLength + 12 > insize || pos + (size_t)chunkLength + 12 < pos) { + CERROR_BREAK(state->error, 64); /*error: size of the in buffer too small to contain next chunk (or int overflow)*/ + } + + data = lodepng_chunk_data_const(chunk); + + unknown = 0; + + /*IDAT chunk, containing compressed image data*/ + if(lodepng_chunk_type_equals(chunk, "IDAT")) { + size_t newsize; + if(lodepng_addofl(idatsize, chunkLength, &newsize)) CERROR_BREAK(state->error, 95); + if(newsize > insize) CERROR_BREAK(state->error, 95); + lodepng_memcpy(idat + idatsize, data, chunkLength); + idatsize += chunkLength; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + critical_pos = 3; +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + } else if(lodepng_chunk_type_equals(chunk, "IEND")) { + /*IEND chunk*/ + IEND = 1; + } else if(lodepng_chunk_type_equals(chunk, "PLTE")) { + /*palette chunk (PLTE)*/ + state->error = readChunk_PLTE(&state->info_png.color, data, chunkLength); + if(state->error) break; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + critical_pos = 2; +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + } else if(lodepng_chunk_type_equals(chunk, "tRNS")) { + /*palette transparency chunk (tRNS). Even though this one is an ancillary chunk , it is still compiled + in without 'LODEPNG_COMPILE_ANCILLARY_CHUNKS' because it contains essential color information that + affects the alpha channel of pixels. */ + state->error = readChunk_tRNS(&state->info_png.color, data, chunkLength); + if(state->error) break; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + /*background color chunk (bKGD)*/ + } else if(lodepng_chunk_type_equals(chunk, "bKGD")) { + state->error = readChunk_bKGD(&state->info_png, data, chunkLength); + if(state->error) break; + } else if(lodepng_chunk_type_equals(chunk, "tEXt")) { + /*text chunk (tEXt)*/ + if(state->decoder.read_text_chunks) { + state->error = readChunk_tEXt(&state->info_png, data, chunkLength); + if(state->error) break; + } + } else if(lodepng_chunk_type_equals(chunk, "zTXt")) { + /*compressed text chunk (zTXt)*/ + if(state->decoder.read_text_chunks) { + state->error = readChunk_zTXt(&state->info_png, &state->decoder, data, chunkLength); + if(state->error) break; + } + } else if(lodepng_chunk_type_equals(chunk, "iTXt")) { + /*international text chunk (iTXt)*/ + if(state->decoder.read_text_chunks) { + state->error = readChunk_iTXt(&state->info_png, &state->decoder, data, chunkLength); + if(state->error) break; + } + } else if(lodepng_chunk_type_equals(chunk, "tIME")) { + state->error = readChunk_tIME(&state->info_png, data, chunkLength); + if(state->error) break; + } else if(lodepng_chunk_type_equals(chunk, "pHYs")) { + state->error = readChunk_pHYs(&state->info_png, data, chunkLength); + if(state->error) break; + } else if(lodepng_chunk_type_equals(chunk, "gAMA")) { + state->error = readChunk_gAMA(&state->info_png, data, chunkLength); + if(state->error) break; + } else if(lodepng_chunk_type_equals(chunk, "cHRM")) { + state->error = readChunk_cHRM(&state->info_png, data, chunkLength); + if(state->error) break; + } else if(lodepng_chunk_type_equals(chunk, "sRGB")) { + state->error = readChunk_sRGB(&state->info_png, data, chunkLength); + if(state->error) break; + } else if(lodepng_chunk_type_equals(chunk, "iCCP")) { + state->error = readChunk_iCCP(&state->info_png, &state->decoder, data, chunkLength); + if(state->error) break; + } else if(lodepng_chunk_type_equals(chunk, "sBIT")) { + state->error = readChunk_sBIT(&state->info_png, data, chunkLength); + if(state->error) break; +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + } else /*it's not an implemented chunk type, so ignore it: skip over the data*/ { + /*error: unknown critical chunk (5th bit of first byte of chunk type is 0)*/ + if(!state->decoder.ignore_critical && !lodepng_chunk_ancillary(chunk)) { + CERROR_BREAK(state->error, 69); + } + + unknown = 1; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + if(state->decoder.remember_unknown_chunks) { + state->error = lodepng_chunk_append(&state->info_png.unknown_chunks_data[critical_pos - 1], + &state->info_png.unknown_chunks_size[critical_pos - 1], chunk); + if(state->error) break; + } +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + } + + if(!state->decoder.ignore_crc && !unknown) /*check CRC if wanted, only on known chunk types*/ { + if(lodepng_chunk_check_crc(chunk)) CERROR_BREAK(state->error, 57); /*invalid CRC*/ + } + + if(!IEND) chunk = lodepng_chunk_next_const(chunk, in + insize); + } + + if(!state->error && state->info_png.color.colortype == LCT_PALETTE && !state->info_png.color.palette) { + state->error = 106; /* error: PNG file must have PLTE chunk if color type is palette */ + } + + if(!state->error) { + /*predict output size, to allocate exact size for output buffer to avoid more dynamic allocation. + If the decompressed size does not match the prediction, the image must be corrupt.*/ + if(state->info_png.interlace_method == 0) { + size_t bpp = lodepng_get_bpp(&state->info_png.color); + expected_size = lodepng_get_raw_size_idat(*w, *h, bpp); + } else { + size_t bpp = lodepng_get_bpp(&state->info_png.color); + /*Adam-7 interlaced: expected size is the sum of the 7 sub-images sizes*/ + expected_size = 0; + expected_size += lodepng_get_raw_size_idat((*w + 7) >> 3, (*h + 7) >> 3, bpp); + if(*w > 4) expected_size += lodepng_get_raw_size_idat((*w + 3) >> 3, (*h + 7) >> 3, bpp); + expected_size += lodepng_get_raw_size_idat((*w + 3) >> 2, (*h + 3) >> 3, bpp); + if(*w > 2) expected_size += lodepng_get_raw_size_idat((*w + 1) >> 2, (*h + 3) >> 2, bpp); + expected_size += lodepng_get_raw_size_idat((*w + 1) >> 1, (*h + 1) >> 2, bpp); + if(*w > 1) expected_size += lodepng_get_raw_size_idat((*w + 0) >> 1, (*h + 1) >> 1, bpp); + expected_size += lodepng_get_raw_size_idat((*w + 0), (*h + 0) >> 1, bpp); + } + + state->error = zlib_decompress(&scanlines, &scanlines_size, expected_size, idat, idatsize, &state->decoder.zlibsettings); + } + if(!state->error && scanlines_size != expected_size) state->error = 91; /*decompressed size doesn't match prediction*/ + lodepng_free(idat); + + if(!state->error) { + outsize = lodepng_get_raw_size(*w, *h, &state->info_png.color); + *out = (unsigned char*)lodepng_malloc(outsize); + if(!*out) state->error = 83; /*alloc fail*/ + } + if(!state->error) { + lodepng_memset(*out, 0, outsize); + state->error = postProcessScanlines(*out, scanlines, *w, *h, &state->info_png); + } + lodepng_free(scanlines); +} + +unsigned lodepng_decode(unsigned char** out, unsigned* w, unsigned* h, + LodePNGState* state, + const unsigned char* in, size_t insize) { + *out = 0; + decodeGeneric(out, w, h, state, in, insize); + if(state->error) return state->error; + if(!state->decoder.color_convert || lodepng_color_mode_equal(&state->info_raw, &state->info_png.color)) { + /*same color type, no copying or converting of data needed*/ + /*store the info_png color settings on the info_raw so that the info_raw still reflects what colortype + the raw image has to the end user*/ + if(!state->decoder.color_convert) { + state->error = lodepng_color_mode_copy(&state->info_raw, &state->info_png.color); + if(state->error) return state->error; + } + } else { /*color conversion needed*/ + unsigned char* data = *out; + size_t outsize; + + /*TODO: check if this works according to the statement in the documentation: "The converter can convert + from grayscale input color type, to 8-bit grayscale or grayscale with alpha"*/ + if(!(state->info_raw.colortype == LCT_RGB || state->info_raw.colortype == LCT_RGBA) + && !(state->info_raw.bitdepth == 8)) { + return 56; /*unsupported color mode conversion*/ + } + + outsize = lodepng_get_raw_size(*w, *h, &state->info_raw); + *out = (unsigned char*)lodepng_malloc(outsize); + if(!(*out)) { + state->error = 83; /*alloc fail*/ + } + else state->error = lodepng_convert(*out, data, &state->info_raw, + &state->info_png.color, *w, *h); + lodepng_free(data); + } + return state->error; +} + +unsigned lodepng_decode_memory(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, + size_t insize, LodePNGColorType colortype, unsigned bitdepth) { + unsigned error; + LodePNGState state; + lodepng_state_init(&state); + state.info_raw.colortype = colortype; + state.info_raw.bitdepth = bitdepth; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + /*disable reading things that this function doesn't output*/ + state.decoder.read_text_chunks = 0; + state.decoder.remember_unknown_chunks = 0; +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + error = lodepng_decode(out, w, h, &state, in, insize); + lodepng_state_cleanup(&state); + return error; +} + +unsigned lodepng_decode32(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, size_t insize) { + return lodepng_decode_memory(out, w, h, in, insize, LCT_RGBA, 8); +} + +unsigned lodepng_decode24(unsigned char** out, unsigned* w, unsigned* h, const unsigned char* in, size_t insize) { + return lodepng_decode_memory(out, w, h, in, insize, LCT_RGB, 8); +} + +#ifdef LODEPNG_COMPILE_DISK +unsigned lodepng_decode_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename, + LodePNGColorType colortype, unsigned bitdepth) { + unsigned char* buffer = 0; + size_t buffersize; + unsigned error; + /* safe output values in case error happens */ + *out = 0; + *w = *h = 0; + error = lodepng_load_file(&buffer, &buffersize, filename); + if(!error) error = lodepng_decode_memory(out, w, h, buffer, buffersize, colortype, bitdepth); + lodepng_free(buffer); + return error; +} + +unsigned lodepng_decode32_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename) { + return lodepng_decode_file(out, w, h, filename, LCT_RGBA, 8); +} + +unsigned lodepng_decode24_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename) { + return lodepng_decode_file(out, w, h, filename, LCT_RGB, 8); +} +#endif /*LODEPNG_COMPILE_DISK*/ + +void lodepng_decoder_settings_init(LodePNGDecoderSettings* settings) { + settings->color_convert = 1; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + settings->read_text_chunks = 1; + settings->remember_unknown_chunks = 0; + settings->max_text_size = 16777216; + settings->max_icc_size = 16777216; /* 16MB is much more than enough for any reasonable ICC profile */ +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + settings->ignore_crc = 0; + settings->ignore_critical = 0; + settings->ignore_end = 0; + lodepng_decompress_settings_init(&settings->zlibsettings); +} + +#endif /*LODEPNG_COMPILE_DECODER*/ + +#if defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER) + +void lodepng_state_init(LodePNGState* state) { +#ifdef LODEPNG_COMPILE_DECODER + lodepng_decoder_settings_init(&state->decoder); +#endif /*LODEPNG_COMPILE_DECODER*/ +#ifdef LODEPNG_COMPILE_ENCODER + lodepng_encoder_settings_init(&state->encoder); +#endif /*LODEPNG_COMPILE_ENCODER*/ + lodepng_color_mode_init(&state->info_raw); + lodepng_info_init(&state->info_png); + state->error = 1; +} + +void lodepng_state_cleanup(LodePNGState* state) { + lodepng_color_mode_cleanup(&state->info_raw); + lodepng_info_cleanup(&state->info_png); +} + +void lodepng_state_copy(LodePNGState* dest, const LodePNGState* source) { + lodepng_state_cleanup(dest); + *dest = *source; + lodepng_color_mode_init(&dest->info_raw); + lodepng_info_init(&dest->info_png); + dest->error = lodepng_color_mode_copy(&dest->info_raw, &source->info_raw); if(dest->error) return; + dest->error = lodepng_info_copy(&dest->info_png, &source->info_png); if(dest->error) return; +} + +#endif /* defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER) */ + +#ifdef LODEPNG_COMPILE_ENCODER + +/* ////////////////////////////////////////////////////////////////////////// */ +/* / PNG Encoder / */ +/* ////////////////////////////////////////////////////////////////////////// */ + + +static unsigned writeSignature(ucvector* out) { + size_t pos = out->size; + const unsigned char signature[] = {137, 80, 78, 71, 13, 10, 26, 10}; + /*8 bytes PNG signature, aka the magic bytes*/ + if(!ucvector_resize(out, out->size + 8)) return 83; /*alloc fail*/ + lodepng_memcpy(out->data + pos, signature, 8); + return 0; +} + +static unsigned addChunk_IHDR(ucvector* out, unsigned w, unsigned h, + LodePNGColorType colortype, unsigned bitdepth, unsigned interlace_method) { + unsigned char *chunk, *data; + CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 13, "IHDR")); + data = chunk + 8; + + lodepng_set32bitInt(data + 0, w); /*width*/ + lodepng_set32bitInt(data + 4, h); /*height*/ + data[8] = (unsigned char)bitdepth; /*bit depth*/ + data[9] = (unsigned char)colortype; /*color type*/ + data[10] = 0; /*compression method*/ + data[11] = 0; /*filter method*/ + data[12] = interlace_method; /*interlace method*/ + + lodepng_chunk_generate_crc(chunk); + return 0; +} + +/* only adds the chunk if needed (there is a key or palette with alpha) */ +static unsigned addChunk_PLTE(ucvector* out, const LodePNGColorMode* info) { + unsigned char* chunk; + size_t i, j = 8; + + if(info->palettesize == 0 || info->palettesize > 256) { + return 68; /*invalid palette size, it is only allowed to be 1-256*/ + } + + CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, info->palettesize * 3, "PLTE")); + + for(i = 0; i != info->palettesize; ++i) { + /*add all channels except alpha channel*/ + chunk[j++] = info->palette[i * 4 + 0]; + chunk[j++] = info->palette[i * 4 + 1]; + chunk[j++] = info->palette[i * 4 + 2]; + } + + lodepng_chunk_generate_crc(chunk); + return 0; +} + +static unsigned addChunk_tRNS(ucvector* out, const LodePNGColorMode* info) { + unsigned char* chunk = 0; + + if(info->colortype == LCT_PALETTE) { + size_t i, amount = info->palettesize; + /*the tail of palette values that all have 255 as alpha, does not have to be encoded*/ + for(i = info->palettesize; i != 0; --i) { + if(info->palette[4 * (i - 1) + 3] != 255) break; + --amount; + } + if(amount) { + CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, amount, "tRNS")); + /*add the alpha channel values from the palette*/ + for(i = 0; i != amount; ++i) chunk[8 + i] = info->palette[4 * i + 3]; + } + } else if(info->colortype == LCT_GREY) { + if(info->key_defined) { + CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 2, "tRNS")); + chunk[8] = (unsigned char)(info->key_r >> 8); + chunk[9] = (unsigned char)(info->key_r & 255); + } + } else if(info->colortype == LCT_RGB) { + if(info->key_defined) { + CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 6, "tRNS")); + chunk[8] = (unsigned char)(info->key_r >> 8); + chunk[9] = (unsigned char)(info->key_r & 255); + chunk[10] = (unsigned char)(info->key_g >> 8); + chunk[11] = (unsigned char)(info->key_g & 255); + chunk[12] = (unsigned char)(info->key_b >> 8); + chunk[13] = (unsigned char)(info->key_b & 255); + } + } + + if(chunk) lodepng_chunk_generate_crc(chunk); + return 0; +} + +static unsigned addChunk_IDAT(ucvector* out, const unsigned char* data, size_t datasize, + LodePNGCompressSettings* zlibsettings) { + unsigned error = 0; + unsigned char* zlib = 0; + size_t zlibsize = 0; + + error = zlib_compress(&zlib, &zlibsize, data, datasize, zlibsettings); + if(!error) { + error = lodepng_chunk_createv(out, zlibsize, "IDAT", zlib); + } + lodepng_free(zlib); + return error; +} + +static unsigned addChunk_IEND(ucvector* out) { + return lodepng_chunk_createv(out, 0, "IEND", 0); +} + +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + +static unsigned addChunk_tEXt(ucvector* out, const char* keyword, const char* textstring) { + unsigned char* chunk = 0; + size_t keysize = lodepng_strlen(keyword), textsize = lodepng_strlen(textstring); + size_t size = keysize + 1 + textsize; + if(keysize < 1 || keysize > 79) return 89; /*error: invalid keyword size*/ + CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, size, "tEXt")); + lodepng_memcpy(chunk + 8, keyword, keysize); + chunk[8 + keysize] = 0; /*null termination char*/ + lodepng_memcpy(chunk + 9 + keysize, textstring, textsize); + lodepng_chunk_generate_crc(chunk); + return 0; +} + +static unsigned addChunk_zTXt(ucvector* out, const char* keyword, const char* textstring, + LodePNGCompressSettings* zlibsettings) { + unsigned error = 0; + unsigned char* chunk = 0; + unsigned char* compressed = 0; + size_t compressedsize = 0; + size_t textsize = lodepng_strlen(textstring); + size_t keysize = lodepng_strlen(keyword); + if(keysize < 1 || keysize > 79) return 89; /*error: invalid keyword size*/ + + error = zlib_compress(&compressed, &compressedsize, + (const unsigned char*)textstring, textsize, zlibsettings); + if(!error) { + size_t size = keysize + 2 + compressedsize; + error = lodepng_chunk_init(&chunk, out, size, "zTXt"); + } + if(!error) { + lodepng_memcpy(chunk + 8, keyword, keysize); + chunk[8 + keysize] = 0; /*null termination char*/ + chunk[9 + keysize] = 0; /*compression method: 0*/ + lodepng_memcpy(chunk + 10 + keysize, compressed, compressedsize); + lodepng_chunk_generate_crc(chunk); + } + + lodepng_free(compressed); + return error; +} + +static unsigned addChunk_iTXt(ucvector* out, unsigned compress, const char* keyword, const char* langtag, + const char* transkey, const char* textstring, LodePNGCompressSettings* zlibsettings) { + unsigned error = 0; + unsigned char* chunk = 0; + unsigned char* compressed = 0; + size_t compressedsize = 0; + size_t textsize = lodepng_strlen(textstring); + size_t keysize = lodepng_strlen(keyword), langsize = lodepng_strlen(langtag), transsize = lodepng_strlen(transkey); + + if(keysize < 1 || keysize > 79) return 89; /*error: invalid keyword size*/ + + if(compress) { + error = zlib_compress(&compressed, &compressedsize, + (const unsigned char*)textstring, textsize, zlibsettings); + } + if(!error) { + size_t size = keysize + 3 + langsize + 1 + transsize + 1 + (compress ? compressedsize : textsize); + error = lodepng_chunk_init(&chunk, out, size, "iTXt"); + } + if(!error) { + size_t pos = 8; + lodepng_memcpy(chunk + pos, keyword, keysize); + pos += keysize; + chunk[pos++] = 0; /*null termination char*/ + chunk[pos++] = (compress ? 1 : 0); /*compression flag*/ + chunk[pos++] = 0; /*compression method: 0*/ + lodepng_memcpy(chunk + pos, langtag, langsize); + pos += langsize; + chunk[pos++] = 0; /*null termination char*/ + lodepng_memcpy(chunk + pos, transkey, transsize); + pos += transsize; + chunk[pos++] = 0; /*null termination char*/ + if(compress) { + lodepng_memcpy(chunk + pos, compressed, compressedsize); + } else { + lodepng_memcpy(chunk + pos, textstring, textsize); + } + lodepng_chunk_generate_crc(chunk); + } + + lodepng_free(compressed); + return error; +} + +static unsigned addChunk_bKGD(ucvector* out, const LodePNGInfo* info) { + unsigned char* chunk = 0; + if(info->color.colortype == LCT_GREY || info->color.colortype == LCT_GREY_ALPHA) { + CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 2, "bKGD")); + chunk[8] = (unsigned char)(info->background_r >> 8); + chunk[9] = (unsigned char)(info->background_r & 255); + } else if(info->color.colortype == LCT_RGB || info->color.colortype == LCT_RGBA) { + CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 6, "bKGD")); + chunk[8] = (unsigned char)(info->background_r >> 8); + chunk[9] = (unsigned char)(info->background_r & 255); + chunk[10] = (unsigned char)(info->background_g >> 8); + chunk[11] = (unsigned char)(info->background_g & 255); + chunk[12] = (unsigned char)(info->background_b >> 8); + chunk[13] = (unsigned char)(info->background_b & 255); + } else if(info->color.colortype == LCT_PALETTE) { + CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 1, "bKGD")); + chunk[8] = (unsigned char)(info->background_r & 255); /*palette index*/ + } + if(chunk) lodepng_chunk_generate_crc(chunk); + return 0; +} + +static unsigned addChunk_tIME(ucvector* out, const LodePNGTime* time) { + unsigned char* chunk; + CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 7, "tIME")); + chunk[8] = (unsigned char)(time->year >> 8); + chunk[9] = (unsigned char)(time->year & 255); + chunk[10] = (unsigned char)time->month; + chunk[11] = (unsigned char)time->day; + chunk[12] = (unsigned char)time->hour; + chunk[13] = (unsigned char)time->minute; + chunk[14] = (unsigned char)time->second; + lodepng_chunk_generate_crc(chunk); + return 0; +} + +static unsigned addChunk_pHYs(ucvector* out, const LodePNGInfo* info) { + unsigned char* chunk; + CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 9, "pHYs")); + lodepng_set32bitInt(chunk + 8, info->phys_x); + lodepng_set32bitInt(chunk + 12, info->phys_y); + chunk[16] = info->phys_unit; + lodepng_chunk_generate_crc(chunk); + return 0; +} + +static unsigned addChunk_gAMA(ucvector* out, const LodePNGInfo* info) { + unsigned char* chunk; + CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 4, "gAMA")); + lodepng_set32bitInt(chunk + 8, info->gama_gamma); + lodepng_chunk_generate_crc(chunk); + return 0; +} + +static unsigned addChunk_cHRM(ucvector* out, const LodePNGInfo* info) { + unsigned char* chunk; + CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 32, "cHRM")); + lodepng_set32bitInt(chunk + 8, info->chrm_white_x); + lodepng_set32bitInt(chunk + 12, info->chrm_white_y); + lodepng_set32bitInt(chunk + 16, info->chrm_red_x); + lodepng_set32bitInt(chunk + 20, info->chrm_red_y); + lodepng_set32bitInt(chunk + 24, info->chrm_green_x); + lodepng_set32bitInt(chunk + 28, info->chrm_green_y); + lodepng_set32bitInt(chunk + 32, info->chrm_blue_x); + lodepng_set32bitInt(chunk + 36, info->chrm_blue_y); + lodepng_chunk_generate_crc(chunk); + return 0; +} + +static unsigned addChunk_sRGB(ucvector* out, const LodePNGInfo* info) { + unsigned char data = info->srgb_intent; + return lodepng_chunk_createv(out, 1, "sRGB", &data); +} + +static unsigned addChunk_iCCP(ucvector* out, const LodePNGInfo* info, LodePNGCompressSettings* zlibsettings) { + unsigned error = 0; + unsigned char* chunk = 0; + unsigned char* compressed = 0; + size_t compressedsize = 0; + size_t keysize = lodepng_strlen(info->iccp_name); + + if(keysize < 1 || keysize > 79) return 89; /*error: invalid keyword size*/ + error = zlib_compress(&compressed, &compressedsize, + info->iccp_profile, info->iccp_profile_size, zlibsettings); + if(!error) { + size_t size = keysize + 2 + compressedsize; + error = lodepng_chunk_init(&chunk, out, size, "iCCP"); + } + if(!error) { + lodepng_memcpy(chunk + 8, info->iccp_name, keysize); + chunk[8 + keysize] = 0; /*null termination char*/ + chunk[9 + keysize] = 0; /*compression method: 0*/ + lodepng_memcpy(chunk + 10 + keysize, compressed, compressedsize); + lodepng_chunk_generate_crc(chunk); + } + + lodepng_free(compressed); + return error; +} + +static unsigned addChunk_sBIT(ucvector* out, const LodePNGInfo* info) { + unsigned bitdepth = (info->color.colortype == LCT_PALETTE) ? 8 : info->color.bitdepth; + unsigned char* chunk = 0; + if(info->color.colortype == LCT_GREY) { + if(info->sbit_r == 0 || info->sbit_r > bitdepth) return 115; + CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 1, "sBIT")); + chunk[8] = info->sbit_r; + } else if(info->color.colortype == LCT_RGB || info->color.colortype == LCT_PALETTE) { + if(info->sbit_r == 0 || info->sbit_g == 0 || info->sbit_b == 0) return 115; + if(info->sbit_r > bitdepth || info->sbit_g > bitdepth || info->sbit_b > bitdepth) return 115; + CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 3, "sBIT")); + chunk[8] = info->sbit_r; + chunk[9] = info->sbit_g; + chunk[10] = info->sbit_b; + } else if(info->color.colortype == LCT_GREY_ALPHA) { + if(info->sbit_r == 0 || info->sbit_a == 0) return 115; + if(info->sbit_r > bitdepth || info->sbit_a > bitdepth) return 115; + CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 2, "sBIT")); + chunk[8] = info->sbit_r; + chunk[9] = info->sbit_a; + } else if(info->color.colortype == LCT_RGBA) { + if(info->sbit_r == 0 || info->sbit_g == 0 || info->sbit_b == 0 || info->sbit_a == 0 || + info->sbit_r > bitdepth || info->sbit_g > bitdepth || + info->sbit_b > bitdepth || info->sbit_a > bitdepth) { + return 115; + } + CERROR_TRY_RETURN(lodepng_chunk_init(&chunk, out, 4, "sBIT")); + chunk[8] = info->sbit_r; + chunk[9] = info->sbit_g; + chunk[10] = info->sbit_b; + chunk[11] = info->sbit_a; + } + if(chunk) lodepng_chunk_generate_crc(chunk); + return 0; +} + +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + +static void filterScanline(unsigned char* out, const unsigned char* scanline, const unsigned char* prevline, + size_t length, size_t bytewidth, unsigned char filterType) { + size_t i; + switch(filterType) { + case 0: /*None*/ + for(i = 0; i != length; ++i) out[i] = scanline[i]; + break; + case 1: /*Sub*/ + for(i = 0; i != bytewidth; ++i) out[i] = scanline[i]; + for(i = bytewidth; i < length; ++i) out[i] = scanline[i] - scanline[i - bytewidth]; + break; + case 2: /*Up*/ + if(prevline) { + for(i = 0; i != length; ++i) out[i] = scanline[i] - prevline[i]; + } else { + for(i = 0; i != length; ++i) out[i] = scanline[i]; + } + break; + case 3: /*Average*/ + if(prevline) { + for(i = 0; i != bytewidth; ++i) out[i] = scanline[i] - (prevline[i] >> 1); + for(i = bytewidth; i < length; ++i) out[i] = scanline[i] - ((scanline[i - bytewidth] + prevline[i]) >> 1); + } else { + for(i = 0; i != bytewidth; ++i) out[i] = scanline[i]; + for(i = bytewidth; i < length; ++i) out[i] = scanline[i] - (scanline[i - bytewidth] >> 1); + } + break; + case 4: /*Paeth*/ + if(prevline) { + /*paethPredictor(0, prevline[i], 0) is always prevline[i]*/ + for(i = 0; i != bytewidth; ++i) out[i] = (scanline[i] - prevline[i]); + for(i = bytewidth; i < length; ++i) { + out[i] = (scanline[i] - paethPredictor(scanline[i - bytewidth], prevline[i], prevline[i - bytewidth])); + } + } else { + for(i = 0; i != bytewidth; ++i) out[i] = scanline[i]; + /*paethPredictor(scanline[i - bytewidth], 0, 0) is always scanline[i - bytewidth]*/ + for(i = bytewidth; i < length; ++i) out[i] = (scanline[i] - scanline[i - bytewidth]); + } + break; + default: return; /*invalid filter type given*/ + } +} + +/* integer binary logarithm, max return value is 31 */ +static size_t ilog2(size_t i) { + size_t result = 0; + if(i >= 65536) { result += 16; i >>= 16; } + if(i >= 256) { result += 8; i >>= 8; } + if(i >= 16) { result += 4; i >>= 4; } + if(i >= 4) { result += 2; i >>= 2; } + if(i >= 2) { result += 1; /*i >>= 1;*/ } + return result; +} + +/* integer approximation for i * log2(i), helper function for LFS_ENTROPY */ +static size_t ilog2i(size_t i) { + size_t l; + if(i == 0) return 0; + l = ilog2(i); + /* approximate i*log2(i): l is integer logarithm, ((i - (1u << l)) << 1u) + linearly approximates the missing fractional part multiplied by i */ + return i * l + ((i - (1u << l)) << 1u); +} + +static unsigned filter(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, + const LodePNGColorMode* color, const LodePNGEncoderSettings* settings) { + /* + For PNG filter method 0 + out must be a buffer with as size: h + (w * h * bpp + 7u) / 8u, because there are + the scanlines with 1 extra byte per scanline + */ + + unsigned bpp = lodepng_get_bpp(color); + /*the width of a scanline in bytes, not including the filter type*/ + size_t linebytes = lodepng_get_raw_size_idat(w, 1, bpp) - 1u; + + /*bytewidth is used for filtering, is 1 when bpp < 8, number of bytes per pixel otherwise*/ + size_t bytewidth = (bpp + 7u) / 8u; + const unsigned char* prevline = 0; + unsigned x, y; + unsigned error = 0; + LodePNGFilterStrategy strategy = settings->filter_strategy; + + /* + There is a heuristic called the minimum sum of absolute differences heuristic, suggested by the PNG standard: + * If the image type is Palette, or the bit depth is smaller than 8, then do not filter the image (i.e. + use fixed filtering, with the filter None). + * (The other case) If the image type is Grayscale or RGB (with or without Alpha), and the bit depth is + not smaller than 8, then use adaptive filtering heuristic as follows: independently for each row, apply + all five filters and select the filter that produces the smallest sum of absolute values per row. + This heuristic is used if filter strategy is LFS_MINSUM and filter_palette_zero is true. + + If filter_palette_zero is true and filter_strategy is not LFS_MINSUM, the above heuristic is followed, + but for "the other case", whatever strategy filter_strategy is set to instead of the minimum sum + heuristic is used. + */ + if(settings->filter_palette_zero && + (color->colortype == LCT_PALETTE || color->bitdepth < 8)) strategy = LFS_ZERO; + + if(bpp == 0) return 31; /*error: invalid color type*/ + + if(strategy >= LFS_ZERO && strategy <= LFS_FOUR) { + unsigned char type = (unsigned char)strategy; + for(y = 0; y != h; ++y) { + size_t outindex = (1 + linebytes) * y; /*the extra filterbyte added to each row*/ + size_t inindex = linebytes * y; + out[outindex] = type; /*filter type byte*/ + filterScanline(&out[outindex + 1], &in[inindex], prevline, linebytes, bytewidth, type); + prevline = &in[inindex]; + } + } else if(strategy == LFS_MINSUM) { + /*adaptive filtering*/ + unsigned char* attempt[5]; /*five filtering attempts, one for each filter type*/ + size_t smallest = 0; + unsigned char type, bestType = 0; + + for(type = 0; type != 5; ++type) { + attempt[type] = (unsigned char*)lodepng_malloc(linebytes); + if(!attempt[type]) error = 83; /*alloc fail*/ + } + + if(!error) { + for(y = 0; y != h; ++y) { + /*try the 5 filter types*/ + for(type = 0; type != 5; ++type) { + size_t sum = 0; + filterScanline(attempt[type], &in[y * linebytes], prevline, linebytes, bytewidth, type); + + /*calculate the sum of the result*/ + if(type == 0) { + for(x = 0; x != linebytes; ++x) sum += (unsigned char)(attempt[type][x]); + } else { + for(x = 0; x != linebytes; ++x) { + /*For differences, each byte should be treated as signed, values above 127 are negative + (converted to signed char). Filtertype 0 isn't a difference though, so use unsigned there. + This means filtertype 0 is almost never chosen, but that is justified.*/ + unsigned char s = attempt[type][x]; + sum += s < 128 ? s : (255U - s); + } + } + + /*check if this is smallest sum (or if type == 0 it's the first case so always store the values)*/ + if(type == 0 || sum < smallest) { + bestType = type; + smallest = sum; + } + } + + prevline = &in[y * linebytes]; + + /*now fill the out values*/ + out[y * (linebytes + 1)] = bestType; /*the first byte of a scanline will be the filter type*/ + for(x = 0; x != linebytes; ++x) out[y * (linebytes + 1) + 1 + x] = attempt[bestType][x]; + } + } + + for(type = 0; type != 5; ++type) lodepng_free(attempt[type]); + } else if(strategy == LFS_ENTROPY) { + unsigned char* attempt[5]; /*five filtering attempts, one for each filter type*/ + size_t bestSum = 0; + unsigned type, bestType = 0; + unsigned count[256]; + + for(type = 0; type != 5; ++type) { + attempt[type] = (unsigned char*)lodepng_malloc(linebytes); + if(!attempt[type]) error = 83; /*alloc fail*/ + } + + if(!error) { + for(y = 0; y != h; ++y) { + /*try the 5 filter types*/ + for(type = 0; type != 5; ++type) { + size_t sum = 0; + filterScanline(attempt[type], &in[y * linebytes], prevline, linebytes, bytewidth, type); + lodepng_memset(count, 0, 256 * sizeof(*count)); + for(x = 0; x != linebytes; ++x) ++count[attempt[type][x]]; + ++count[type]; /*the filter type itself is part of the scanline*/ + for(x = 0; x != 256; ++x) { + sum += ilog2i(count[x]); + } + /*check if this is smallest sum (or if type == 0 it's the first case so always store the values)*/ + if(type == 0 || sum > bestSum) { + bestType = type; + bestSum = sum; + } + } + + prevline = &in[y * linebytes]; + + /*now fill the out values*/ + out[y * (linebytes + 1)] = bestType; /*the first byte of a scanline will be the filter type*/ + for(x = 0; x != linebytes; ++x) out[y * (linebytes + 1) + 1 + x] = attempt[bestType][x]; + } + } + + for(type = 0; type != 5; ++type) lodepng_free(attempt[type]); + } else if(strategy == LFS_PREDEFINED) { + for(y = 0; y != h; ++y) { + size_t outindex = (1 + linebytes) * y; /*the extra filterbyte added to each row*/ + size_t inindex = linebytes * y; + unsigned char type = settings->predefined_filters[y]; + out[outindex] = type; /*filter type byte*/ + filterScanline(&out[outindex + 1], &in[inindex], prevline, linebytes, bytewidth, type); + prevline = &in[inindex]; + } + } else if(strategy == LFS_BRUTE_FORCE) { + /*brute force filter chooser. + deflate the scanline after every filter attempt to see which one deflates best. + This is very slow and gives only slightly smaller, sometimes even larger, result*/ + size_t size[5]; + unsigned char* attempt[5]; /*five filtering attempts, one for each filter type*/ + size_t smallest = 0; + unsigned type = 0, bestType = 0; + unsigned char* dummy; + LodePNGCompressSettings zlibsettings; + lodepng_memcpy(&zlibsettings, &settings->zlibsettings, sizeof(LodePNGCompressSettings)); + /*use fixed tree on the attempts so that the tree is not adapted to the filtertype on purpose, + to simulate the true case where the tree is the same for the whole image. Sometimes it gives + better result with dynamic tree anyway. Using the fixed tree sometimes gives worse, but in rare + cases better compression. It does make this a bit less slow, so it's worth doing this.*/ + zlibsettings.btype = 1; + /*a custom encoder likely doesn't read the btype setting and is optimized for complete PNG + images only, so disable it*/ + zlibsettings.custom_zlib = 0; + zlibsettings.custom_deflate = 0; + for(type = 0; type != 5; ++type) { + attempt[type] = (unsigned char*)lodepng_malloc(linebytes); + if(!attempt[type]) error = 83; /*alloc fail*/ + } + if(!error) { + for(y = 0; y != h; ++y) /*try the 5 filter types*/ { + for(type = 0; type != 5; ++type) { + unsigned testsize = (unsigned)linebytes; + /*if(testsize > 8) testsize /= 8;*/ /*it already works good enough by testing a part of the row*/ + + filterScanline(attempt[type], &in[y * linebytes], prevline, linebytes, bytewidth, type); + size[type] = 0; + dummy = 0; + zlib_compress(&dummy, &size[type], attempt[type], testsize, &zlibsettings); + lodepng_free(dummy); + /*check if this is smallest size (or if type == 0 it's the first case so always store the values)*/ + if(type == 0 || size[type] < smallest) { + bestType = type; + smallest = size[type]; + } + } + prevline = &in[y * linebytes]; + out[y * (linebytes + 1)] = bestType; /*the first byte of a scanline will be the filter type*/ + for(x = 0; x != linebytes; ++x) out[y * (linebytes + 1) + 1 + x] = attempt[bestType][x]; + } + } + for(type = 0; type != 5; ++type) lodepng_free(attempt[type]); + } + else return 88; /* unknown filter strategy */ + + return error; +} + +static void addPaddingBits(unsigned char* out, const unsigned char* in, + size_t olinebits, size_t ilinebits, unsigned h) { + /*The opposite of the removePaddingBits function + olinebits must be >= ilinebits*/ + unsigned y; + size_t diff = olinebits - ilinebits; + size_t obp = 0, ibp = 0; /*bit pointers*/ + for(y = 0; y != h; ++y) { + size_t x; + for(x = 0; x < ilinebits; ++x) { + unsigned char bit = readBitFromReversedStream(&ibp, in); + setBitOfReversedStream(&obp, out, bit); + } + /*obp += diff; --> no, fill in some value in the padding bits too, to avoid + "Use of uninitialised value of size ###" warning from valgrind*/ + for(x = 0; x != diff; ++x) setBitOfReversedStream(&obp, out, 0); + } +} + +/* +in: non-interlaced image with size w*h +out: the same pixels, but re-ordered according to PNG's Adam7 interlacing, with + no padding bits between scanlines, but between reduced images so that each + reduced image starts at a byte. +bpp: bits per pixel +there are no padding bits, not between scanlines, not between reduced images +in has the following size in bits: w * h * bpp. +out is possibly bigger due to padding bits between reduced images +NOTE: comments about padding bits are only relevant if bpp < 8 +*/ +static void Adam7_interlace(unsigned char* out, const unsigned char* in, unsigned w, unsigned h, unsigned bpp) { + unsigned passw[7], passh[7]; + size_t filter_passstart[8], padded_passstart[8], passstart[8]; + unsigned i; + + Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp); + + if(bpp >= 8) { + for(i = 0; i != 7; ++i) { + unsigned x, y, b; + size_t bytewidth = bpp / 8u; + for(y = 0; y < passh[i]; ++y) + for(x = 0; x < passw[i]; ++x) { + size_t pixelinstart = ((ADAM7_IY[i] + y * ADAM7_DY[i]) * w + ADAM7_IX[i] + x * ADAM7_DX[i]) * bytewidth; + size_t pixeloutstart = passstart[i] + (y * passw[i] + x) * bytewidth; + for(b = 0; b < bytewidth; ++b) { + out[pixeloutstart + b] = in[pixelinstart + b]; + } + } + } + } else /*bpp < 8: Adam7 with pixels < 8 bit is a bit trickier: with bit pointers*/ { + for(i = 0; i != 7; ++i) { + unsigned x, y, b; + unsigned ilinebits = bpp * passw[i]; + unsigned olinebits = bpp * w; + size_t obp, ibp; /*bit pointers (for out and in buffer)*/ + for(y = 0; y < passh[i]; ++y) + for(x = 0; x < passw[i]; ++x) { + ibp = (ADAM7_IY[i] + y * ADAM7_DY[i]) * olinebits + (ADAM7_IX[i] + x * ADAM7_DX[i]) * bpp; + obp = (8 * passstart[i]) + (y * ilinebits + x * bpp); + for(b = 0; b < bpp; ++b) { + unsigned char bit = readBitFromReversedStream(&ibp, in); + setBitOfReversedStream(&obp, out, bit); + } + } + } + } +} + +/*out must be buffer big enough to contain uncompressed IDAT chunk data, and in must contain the full image. +return value is error**/ +static unsigned preProcessScanlines(unsigned char** out, size_t* outsize, const unsigned char* in, + unsigned w, unsigned h, + const LodePNGInfo* info_png, const LodePNGEncoderSettings* settings) { + /* + This function converts the pure 2D image with the PNG's colortype, into filtered-padded-interlaced data. Steps: + *) if no Adam7: 1) add padding bits (= possible extra bits per scanline if bpp < 8) 2) filter + *) if adam7: 1) Adam7_interlace 2) 7x add padding bits 3) 7x filter + */ + unsigned bpp = lodepng_get_bpp(&info_png->color); + unsigned error = 0; + + if(info_png->interlace_method == 0) { + *outsize = h + (h * ((w * bpp + 7u) / 8u)); /*image size plus an extra byte per scanline + possible padding bits*/ + *out = (unsigned char*)lodepng_malloc(*outsize); + if(!(*out) && (*outsize)) error = 83; /*alloc fail*/ + + if(!error) { + /*non multiple of 8 bits per scanline, padding bits needed per scanline*/ + if(bpp < 8 && w * bpp != ((w * bpp + 7u) / 8u) * 8u) { + unsigned char* padded = (unsigned char*)lodepng_malloc(h * ((w * bpp + 7u) / 8u)); + if(!padded) error = 83; /*alloc fail*/ + if(!error) { + addPaddingBits(padded, in, ((w * bpp + 7u) / 8u) * 8u, w * bpp, h); + error = filter(*out, padded, w, h, &info_png->color, settings); + } + lodepng_free(padded); + } else { + /*we can immediately filter into the out buffer, no other steps needed*/ + error = filter(*out, in, w, h, &info_png->color, settings); + } + } + } else /*interlace_method is 1 (Adam7)*/ { + unsigned passw[7], passh[7]; + size_t filter_passstart[8], padded_passstart[8], passstart[8]; + unsigned char* adam7; + + Adam7_getpassvalues(passw, passh, filter_passstart, padded_passstart, passstart, w, h, bpp); + + *outsize = filter_passstart[7]; /*image size plus an extra byte per scanline + possible padding bits*/ + *out = (unsigned char*)lodepng_malloc(*outsize); + if(!(*out)) error = 83; /*alloc fail*/ + + adam7 = (unsigned char*)lodepng_malloc(passstart[7]); + if(!adam7 && passstart[7]) error = 83; /*alloc fail*/ + + if(!error) { + unsigned i; + + Adam7_interlace(adam7, in, w, h, bpp); + for(i = 0; i != 7; ++i) { + if(bpp < 8) { + unsigned char* padded = (unsigned char*)lodepng_malloc(padded_passstart[i + 1] - padded_passstart[i]); + if(!padded) ERROR_BREAK(83); /*alloc fail*/ + addPaddingBits(padded, &adam7[passstart[i]], + ((passw[i] * bpp + 7u) / 8u) * 8u, passw[i] * bpp, passh[i]); + error = filter(&(*out)[filter_passstart[i]], padded, + passw[i], passh[i], &info_png->color, settings); + lodepng_free(padded); + } else { + error = filter(&(*out)[filter_passstart[i]], &adam7[padded_passstart[i]], + passw[i], passh[i], &info_png->color, settings); + } + + if(error) break; + } + } + + lodepng_free(adam7); + } + + return error; +} + +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS +static unsigned addUnknownChunks(ucvector* out, unsigned char* data, size_t datasize) { + unsigned char* inchunk = data; + while((size_t)(inchunk - data) < datasize) { + CERROR_TRY_RETURN(lodepng_chunk_append(&out->data, &out->size, inchunk)); + out->allocsize = out->size; /*fix the allocsize again*/ + inchunk = lodepng_chunk_next(inchunk, data + datasize); + } + return 0; +} + +static unsigned isGrayICCProfile(const unsigned char* profile, unsigned size) { + /* + It is a gray profile if bytes 16-19 are "GRAY", rgb profile if bytes 16-19 + are "RGB ". We do not perform any full parsing of the ICC profile here, other + than check those 4 bytes to grayscale profile. Other than that, validity of + the profile is not checked. This is needed only because the PNG specification + requires using a non-gray color model if there is an ICC profile with "RGB " + (sadly limiting compression opportunities if the input data is grayscale RGB + data), and requires using a gray color model if it is "GRAY". + */ + if(size < 20) return 0; + return profile[16] == 'G' && profile[17] == 'R' && profile[18] == 'A' && profile[19] == 'Y'; +} + +static unsigned isRGBICCProfile(const unsigned char* profile, unsigned size) { + /* See comment in isGrayICCProfile*/ + if(size < 20) return 0; + return profile[16] == 'R' && profile[17] == 'G' && profile[18] == 'B' && profile[19] == ' '; +} +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + +unsigned lodepng_encode(unsigned char** out, size_t* outsize, + const unsigned char* image, unsigned w, unsigned h, + LodePNGState* state) { + unsigned char* data = 0; /*uncompressed version of the IDAT chunk data*/ + size_t datasize = 0; + ucvector outv = ucvector_init(NULL, 0); + LodePNGInfo info; + const LodePNGInfo* info_png = &state->info_png; + LodePNGColorMode auto_color; + + lodepng_info_init(&info); + lodepng_color_mode_init(&auto_color); + + /*provide some proper output values if error will happen*/ + *out = 0; + *outsize = 0; + state->error = 0; + + /*check input values validity*/ + if((info_png->color.colortype == LCT_PALETTE || state->encoder.force_palette) + && (info_png->color.palettesize == 0 || info_png->color.palettesize > 256)) { + /*this error is returned even if auto_convert is enabled and thus encoder could + generate the palette by itself: while allowing this could be possible in theory, + it may complicate the code or edge cases, and always requiring to give a palette + when setting this color type is a simpler contract*/ + state->error = 68; /*invalid palette size, it is only allowed to be 1-256*/ + goto cleanup; + } + if(state->encoder.zlibsettings.btype > 2) { + state->error = 61; /*error: invalid btype*/ + goto cleanup; + } + if(info_png->interlace_method > 1) { + state->error = 71; /*error: invalid interlace mode*/ + goto cleanup; + } + state->error = checkColorValidity(info_png->color.colortype, info_png->color.bitdepth); + if(state->error) goto cleanup; /*error: invalid color type given*/ + state->error = checkColorValidity(state->info_raw.colortype, state->info_raw.bitdepth); + if(state->error) goto cleanup; /*error: invalid color type given*/ + + /* color convert and compute scanline filter types */ + lodepng_info_copy(&info, &state->info_png); + if(state->encoder.auto_convert) { + LodePNGColorStats stats; + unsigned allow_convert = 1; + lodepng_color_stats_init(&stats); +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + if(info_png->iccp_defined && + isGrayICCProfile(info_png->iccp_profile, info_png->iccp_profile_size)) { + /*the PNG specification does not allow to use palette with a GRAY ICC profile, even + if the palette has only gray colors, so disallow it.*/ + stats.allow_palette = 0; + } + if(info_png->iccp_defined && + isRGBICCProfile(info_png->iccp_profile, info_png->iccp_profile_size)) { + /*the PNG specification does not allow to use grayscale color with RGB ICC profile, so disallow gray.*/ + stats.allow_greyscale = 0; + } +#endif /* LODEPNG_COMPILE_ANCILLARY_CHUNKS */ + state->error = lodepng_compute_color_stats(&stats, image, w, h, &state->info_raw); + if(state->error) goto cleanup; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + if(info_png->background_defined) { + /*the background chunk's color must be taken into account as well*/ + unsigned r = 0, g = 0, b = 0; + LodePNGColorMode mode16 = lodepng_color_mode_make(LCT_RGB, 16); + lodepng_convert_rgb(&r, &g, &b, + info_png->background_r, info_png->background_g, info_png->background_b, &mode16, &info_png->color); + state->error = lodepng_color_stats_add(&stats, r, g, b, 65535); + if(state->error) goto cleanup; + } +#endif /* LODEPNG_COMPILE_ANCILLARY_CHUNKS */ + state->error = auto_choose_color(&auto_color, &state->info_raw, &stats); + if(state->error) goto cleanup; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + if(info_png->sbit_defined) { + /*if sbit is defined, due to strict requirements of which sbit values can be present for which color modes, + auto_convert can't be done in many cases. However, do support a few cases here. + TODO: more conversions may be possible, and it may also be possible to get a more appropriate color type out of + auto_choose_color if knowledge about sbit is used beforehand + */ + unsigned sbit_max = LODEPNG_MAX(LODEPNG_MAX(LODEPNG_MAX(info_png->sbit_r, info_png->sbit_g), + info_png->sbit_b), info_png->sbit_a); + unsigned equal = (!info_png->sbit_g || info_png->sbit_g == info_png->sbit_r) + && (!info_png->sbit_b || info_png->sbit_b == info_png->sbit_r) + && (!info_png->sbit_a || info_png->sbit_a == info_png->sbit_r); + allow_convert = 0; + if(info.color.colortype == LCT_PALETTE && + auto_color.colortype == LCT_PALETTE) { + /* input and output are palette, and in this case it may happen that palette data is + expected to be copied from info_raw into the info_png */ + allow_convert = 1; + } + /*going from 8-bit RGB to palette (or 16-bit as long as sbit_max <= 8) is possible + since both are 8-bit RGB for sBIT's purposes*/ + if(info.color.colortype == LCT_RGB && + auto_color.colortype == LCT_PALETTE && sbit_max <= 8) { + allow_convert = 1; + } + /*going from 8-bit RGBA to palette is also ok but only if sbit_a is exactly 8*/ + if(info.color.colortype == LCT_RGBA && auto_color.colortype == LCT_PALETTE && + info_png->sbit_a == 8 && sbit_max <= 8) { + allow_convert = 1; + } + /*going from 16-bit RGB(A) to 8-bit RGB(A) is ok if all sbit values are <= 8*/ + if((info.color.colortype == LCT_RGB || info.color.colortype == LCT_RGBA) && info.color.bitdepth == 16 && + auto_color.colortype == info.color.colortype && auto_color.bitdepth == 8 && + sbit_max <= 8) { + allow_convert = 1; + } + /*going to less channels is ok if all bit values are equal (all possible values in sbit, + as well as the chosen bitdepth of the result). Due to how auto_convert works, + we already know that auto_color.colortype has less than or equal amount of channels than + info.colortype. Palette is not used here. This conversion is not allowed if + info_png->sbit_r < auto_color.bitdepth, because specifically for alpha, non-presence of + an sbit value heavily implies that alpha's bit depth is equal to the PNG bit depth (rather + than the bit depths set in the r, g and b sbit values, by how the PNG specification describes + handling tRNS chunk case with sBIT), so be conservative here about ignoring user input.*/ + if(info.color.colortype != LCT_PALETTE && auto_color.colortype != LCT_PALETTE && + equal && info_png->sbit_r == auto_color.bitdepth) { + allow_convert = 1; + } + } +#endif + if(state->encoder.force_palette) { + if(info.color.colortype != LCT_GREY && info.color.colortype != LCT_GREY_ALPHA && + (auto_color.colortype == LCT_GREY || auto_color.colortype == LCT_GREY_ALPHA)) { + /*user speficially forced a PLTE palette, so cannot convert to grayscale types because + the PNG specification only allows writing a suggested palette in PLTE for truecolor types*/ + allow_convert = 0; + } + } + if(allow_convert) { + lodepng_color_mode_copy(&info.color, &auto_color); +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + /*also convert the background chunk*/ + if(info_png->background_defined) { + if(lodepng_convert_rgb(&info.background_r, &info.background_g, &info.background_b, + info_png->background_r, info_png->background_g, info_png->background_b, &info.color, &info_png->color)) { + state->error = 104; + goto cleanup; + } + } +#endif /* LODEPNG_COMPILE_ANCILLARY_CHUNKS */ + } + } +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + if(info_png->iccp_defined) { + unsigned gray_icc = isGrayICCProfile(info_png->iccp_profile, info_png->iccp_profile_size); + unsigned rgb_icc = isRGBICCProfile(info_png->iccp_profile, info_png->iccp_profile_size); + unsigned gray_png = info.color.colortype == LCT_GREY || info.color.colortype == LCT_GREY_ALPHA; + if(!gray_icc && !rgb_icc) { + state->error = 100; /* Disallowed profile color type for PNG */ + goto cleanup; + } + if(gray_icc != gray_png) { + /*Not allowed to use RGB/RGBA/palette with GRAY ICC profile or vice versa, + or in case of auto_convert, it wasn't possible to find appropriate model*/ + state->error = state->encoder.auto_convert ? 102 : 101; + goto cleanup; + } + } +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + if(!lodepng_color_mode_equal(&state->info_raw, &info.color)) { + unsigned char* converted; + size_t size = ((size_t)w * (size_t)h * (size_t)lodepng_get_bpp(&info.color) + 7u) / 8u; + + converted = (unsigned char*)lodepng_malloc(size); + if(!converted && size) state->error = 83; /*alloc fail*/ + if(!state->error) { + state->error = lodepng_convert(converted, image, &info.color, &state->info_raw, w, h); + } + if(!state->error) { + state->error = preProcessScanlines(&data, &datasize, converted, w, h, &info, &state->encoder); + } + lodepng_free(converted); + if(state->error) goto cleanup; + } else { + state->error = preProcessScanlines(&data, &datasize, image, w, h, &info, &state->encoder); + if(state->error) goto cleanup; + } + + /* output all PNG chunks */ { +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + size_t i; +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + /*write signature and chunks*/ + state->error = writeSignature(&outv); + if(state->error) goto cleanup; + /*IHDR*/ + state->error = addChunk_IHDR(&outv, w, h, info.color.colortype, info.color.bitdepth, info.interlace_method); + if(state->error) goto cleanup; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + /*unknown chunks between IHDR and PLTE*/ + if(info.unknown_chunks_data[0]) { + state->error = addUnknownChunks(&outv, info.unknown_chunks_data[0], info.unknown_chunks_size[0]); + if(state->error) goto cleanup; + } + /*color profile chunks must come before PLTE */ + if(info.iccp_defined) { + state->error = addChunk_iCCP(&outv, &info, &state->encoder.zlibsettings); + if(state->error) goto cleanup; + } + if(info.srgb_defined) { + state->error = addChunk_sRGB(&outv, &info); + if(state->error) goto cleanup; + } + if(info.gama_defined) { + state->error = addChunk_gAMA(&outv, &info); + if(state->error) goto cleanup; + } + if(info.chrm_defined) { + state->error = addChunk_cHRM(&outv, &info); + if(state->error) goto cleanup; + } + if(info_png->sbit_defined) { + state->error = addChunk_sBIT(&outv, &info); + if(state->error) goto cleanup; + } +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + /*PLTE*/ + if(info.color.colortype == LCT_PALETTE) { + state->error = addChunk_PLTE(&outv, &info.color); + if(state->error) goto cleanup; + } + if(state->encoder.force_palette && (info.color.colortype == LCT_RGB || info.color.colortype == LCT_RGBA)) { + /*force_palette means: write suggested palette for truecolor in PLTE chunk*/ + state->error = addChunk_PLTE(&outv, &info.color); + if(state->error) goto cleanup; + } + /*tRNS (this will only add if when necessary) */ + state->error = addChunk_tRNS(&outv, &info.color); + if(state->error) goto cleanup; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + /*bKGD (must come between PLTE and the IDAt chunks*/ + if(info.background_defined) { + state->error = addChunk_bKGD(&outv, &info); + if(state->error) goto cleanup; + } + /*pHYs (must come before the IDAT chunks)*/ + if(info.phys_defined) { + state->error = addChunk_pHYs(&outv, &info); + if(state->error) goto cleanup; + } + + /*unknown chunks between PLTE and IDAT*/ + if(info.unknown_chunks_data[1]) { + state->error = addUnknownChunks(&outv, info.unknown_chunks_data[1], info.unknown_chunks_size[1]); + if(state->error) goto cleanup; + } +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + /*IDAT (multiple IDAT chunks must be consecutive)*/ + state->error = addChunk_IDAT(&outv, data, datasize, &state->encoder.zlibsettings); + if(state->error) goto cleanup; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + /*tIME*/ + if(info.time_defined) { + state->error = addChunk_tIME(&outv, &info.time); + if(state->error) goto cleanup; + } + /*tEXt and/or zTXt*/ + for(i = 0; i != info.text_num; ++i) { + if(lodepng_strlen(info.text_keys[i]) > 79) { + state->error = 66; /*text chunk too large*/ + goto cleanup; + } + if(lodepng_strlen(info.text_keys[i]) < 1) { + state->error = 67; /*text chunk too small*/ + goto cleanup; + } + if(state->encoder.text_compression) { + state->error = addChunk_zTXt(&outv, info.text_keys[i], info.text_strings[i], &state->encoder.zlibsettings); + if(state->error) goto cleanup; + } else { + state->error = addChunk_tEXt(&outv, info.text_keys[i], info.text_strings[i]); + if(state->error) goto cleanup; + } + } + /*LodePNG version id in text chunk*/ + if(state->encoder.add_id) { + unsigned already_added_id_text = 0; + for(i = 0; i != info.text_num; ++i) { + const char* k = info.text_keys[i]; + /* Could use strcmp, but we're not calling or reimplementing this C library function for this use only */ + if(k[0] == 'L' && k[1] == 'o' && k[2] == 'd' && k[3] == 'e' && + k[4] == 'P' && k[5] == 'N' && k[6] == 'G' && k[7] == '\0') { + already_added_id_text = 1; + break; + } + } + if(already_added_id_text == 0) { + state->error = addChunk_tEXt(&outv, "LodePNG", LODEPNG_VERSION_STRING); /*it's shorter as tEXt than as zTXt chunk*/ + if(state->error) goto cleanup; + } + } + /*iTXt*/ + for(i = 0; i != info.itext_num; ++i) { + if(lodepng_strlen(info.itext_keys[i]) > 79) { + state->error = 66; /*text chunk too large*/ + goto cleanup; + } + if(lodepng_strlen(info.itext_keys[i]) < 1) { + state->error = 67; /*text chunk too small*/ + goto cleanup; + } + state->error = addChunk_iTXt( + &outv, state->encoder.text_compression, + info.itext_keys[i], info.itext_langtags[i], info.itext_transkeys[i], info.itext_strings[i], + &state->encoder.zlibsettings); + if(state->error) goto cleanup; + } + + /*unknown chunks between IDAT and IEND*/ + if(info.unknown_chunks_data[2]) { + state->error = addUnknownChunks(&outv, info.unknown_chunks_data[2], info.unknown_chunks_size[2]); + if(state->error) goto cleanup; + } +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + state->error = addChunk_IEND(&outv); + if(state->error) goto cleanup; + } + +cleanup: + lodepng_info_cleanup(&info); + lodepng_free(data); + lodepng_color_mode_cleanup(&auto_color); + + /*instead of cleaning the vector up, give it to the output*/ + *out = outv.data; + *outsize = outv.size; + + return state->error; +} + +unsigned lodepng_encode_memory(unsigned char** out, size_t* outsize, const unsigned char* image, + unsigned w, unsigned h, LodePNGColorType colortype, unsigned bitdepth) { + unsigned error; + LodePNGState state; + lodepng_state_init(&state); + state.info_raw.colortype = colortype; + state.info_raw.bitdepth = bitdepth; + state.info_png.color.colortype = colortype; + state.info_png.color.bitdepth = bitdepth; + lodepng_encode(out, outsize, image, w, h, &state); + error = state.error; + lodepng_state_cleanup(&state); + return error; +} + +unsigned lodepng_encode32(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h) { + return lodepng_encode_memory(out, outsize, image, w, h, LCT_RGBA, 8); +} + +unsigned lodepng_encode24(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h) { + return lodepng_encode_memory(out, outsize, image, w, h, LCT_RGB, 8); +} + +#ifdef LODEPNG_COMPILE_DISK +unsigned lodepng_encode_file(const char* filename, const unsigned char* image, unsigned w, unsigned h, + LodePNGColorType colortype, unsigned bitdepth) { + unsigned char* buffer; + size_t buffersize; + unsigned error = lodepng_encode_memory(&buffer, &buffersize, image, w, h, colortype, bitdepth); + if(!error) error = lodepng_save_file(buffer, buffersize, filename); + lodepng_free(buffer); + return error; +} + +unsigned lodepng_encode32_file(const char* filename, const unsigned char* image, unsigned w, unsigned h) { + return lodepng_encode_file(filename, image, w, h, LCT_RGBA, 8); +} + +unsigned lodepng_encode24_file(const char* filename, const unsigned char* image, unsigned w, unsigned h) { + return lodepng_encode_file(filename, image, w, h, LCT_RGB, 8); +} +#endif /*LODEPNG_COMPILE_DISK*/ + +void lodepng_encoder_settings_init(LodePNGEncoderSettings* settings) { + lodepng_compress_settings_init(&settings->zlibsettings); + settings->filter_palette_zero = 1; + settings->filter_strategy = LFS_MINSUM; + settings->auto_convert = 1; + settings->force_palette = 0; + settings->predefined_filters = 0; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + settings->add_id = 0; + settings->text_compression = 1; +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ +} + +#endif /*LODEPNG_COMPILE_ENCODER*/ +#endif /*LODEPNG_COMPILE_PNG*/ + +#ifdef LODEPNG_COMPILE_ERROR_TEXT +/* +This returns the description of a numerical error code in English. This is also +the documentation of all the error codes. +*/ +const char* lodepng_error_text(unsigned code) { + switch(code) { + case 0: return "no error, everything went ok"; + case 1: return "nothing done yet"; /*the Encoder/Decoder has done nothing yet, error checking makes no sense yet*/ + case 10: return "end of input memory reached without huffman end code"; /*while huffman decoding*/ + case 11: return "error in code tree made it jump outside of huffman tree"; /*while huffman decoding*/ + case 13: return "problem while processing dynamic deflate block"; + case 14: return "problem while processing dynamic deflate block"; + case 15: return "problem while processing dynamic deflate block"; + /*this error could happen if there are only 0 or 1 symbols present in the huffman code:*/ + case 16: return "invalid code while processing dynamic deflate block"; + case 17: return "end of out buffer memory reached while inflating"; + case 18: return "invalid distance code while inflating"; + case 19: return "end of out buffer memory reached while inflating"; + case 20: return "invalid deflate block BTYPE encountered while decoding"; + case 21: return "NLEN is not ones complement of LEN in a deflate block"; + + /*end of out buffer memory reached while inflating: + This can happen if the inflated deflate data is longer than the amount of bytes required to fill up + all the pixels of the image, given the color depth and image dimensions. Something that doesn't + happen in a normal, well encoded, PNG image.*/ + case 22: return "end of out buffer memory reached while inflating"; + case 23: return "end of in buffer memory reached while inflating"; + case 24: return "invalid FCHECK in zlib header"; + case 25: return "invalid compression method in zlib header"; + case 26: return "FDICT encountered in zlib header while it's not used for PNG"; + case 27: return "PNG file is smaller than a PNG header"; + /*Checks the magic file header, the first 8 bytes of the PNG file*/ + case 28: return "incorrect PNG signature, it's no PNG or corrupted"; + case 29: return "first chunk is not the header chunk"; + case 30: return "chunk length too large, chunk broken off at end of file"; + case 31: return "illegal PNG color type or bpp"; + case 32: return "illegal PNG compression method"; + case 33: return "illegal PNG filter method"; + case 34: return "illegal PNG interlace method"; + case 35: return "chunk length of a chunk is too large or the chunk too small"; + case 36: return "illegal PNG filter type encountered"; + case 37: return "illegal bit depth for this color type given"; + case 38: return "the palette is too small or too big"; /*0, or more than 256 colors*/ + case 39: return "tRNS chunk before PLTE or has more entries than palette size"; + case 40: return "tRNS chunk has wrong size for grayscale image"; + case 41: return "tRNS chunk has wrong size for RGB image"; + case 42: return "tRNS chunk appeared while it was not allowed for this color type"; + case 43: return "bKGD chunk has wrong size for palette image"; + case 44: return "bKGD chunk has wrong size for grayscale image"; + case 45: return "bKGD chunk has wrong size for RGB image"; + case 48: return "empty input buffer given to decoder. Maybe caused by non-existing file?"; + case 49: return "jumped past memory while generating dynamic huffman tree"; + case 50: return "jumped past memory while generating dynamic huffman tree"; + case 51: return "jumped past memory while inflating huffman block"; + case 52: return "jumped past memory while inflating"; + case 53: return "size of zlib data too small"; + case 54: return "repeat symbol in tree while there was no value symbol yet"; + /*jumped past tree while generating huffman tree, this could be when the + tree will have more leaves than symbols after generating it out of the + given lengths. They call this an oversubscribed dynamic bit lengths tree in zlib.*/ + case 55: return "jumped past tree while generating huffman tree"; + case 56: return "given output image colortype or bitdepth not supported for color conversion"; + case 57: return "invalid CRC encountered (checking CRC can be disabled)"; + case 58: return "invalid ADLER32 encountered (checking ADLER32 can be disabled)"; + case 59: return "requested color conversion not supported"; + case 60: return "invalid window size given in the settings of the encoder (must be 0-32768)"; + case 61: return "invalid BTYPE given in the settings of the encoder (only 0, 1 and 2 are allowed)"; + /*LodePNG leaves the choice of RGB to grayscale conversion formula to the user.*/ + case 62: return "conversion from color to grayscale not supported"; + /*(2^31-1)*/ + case 63: return "length of a chunk too long, max allowed for PNG is 2147483647 bytes per chunk"; + /*this would result in the inability of a deflated block to ever contain an end code. It must be at least 1.*/ + case 64: return "the length of the END symbol 256 in the Huffman tree is 0"; + case 66: return "the length of a text chunk keyword given to the encoder is longer than the maximum of 79 bytes"; + case 67: return "the length of a text chunk keyword given to the encoder is smaller than the minimum of 1 byte"; + case 68: return "tried to encode a PLTE chunk with a palette that has less than 1 or more than 256 colors"; + case 69: return "unknown chunk type with 'critical' flag encountered by the decoder"; + case 71: return "invalid interlace mode given to encoder (must be 0 or 1)"; + case 72: return "while decoding, invalid compression method encountering in zTXt or iTXt chunk (it must be 0)"; + case 73: return "invalid tIME chunk size"; + case 74: return "invalid pHYs chunk size"; + /*length could be wrong, or data chopped off*/ + case 75: return "no null termination char found while decoding text chunk"; + case 76: return "iTXt chunk too short to contain required bytes"; + case 77: return "integer overflow in buffer size"; + case 78: return "failed to open file for reading"; /*file doesn't exist or couldn't be opened for reading*/ + case 79: return "failed to open file for writing"; + case 80: return "tried creating a tree of 0 symbols"; + case 81: return "lazy matching at pos 0 is impossible"; + case 82: return "color conversion to palette requested while a color isn't in palette, or index out of bounds"; + case 83: return "memory allocation failed"; + case 84: return "given image too small to contain all pixels to be encoded"; + case 86: return "impossible offset in lz77 encoding (internal bug)"; + case 87: return "must provide custom zlib function pointer if LODEPNG_COMPILE_ZLIB is not defined"; + case 88: return "invalid filter strategy given for LodePNGEncoderSettings.filter_strategy"; + case 89: return "text chunk keyword too short or long: must have size 1-79"; + /*the windowsize in the LodePNGCompressSettings. Requiring POT(==> & instead of %) makes encoding 12% faster.*/ + case 90: return "windowsize must be a power of two"; + case 91: return "invalid decompressed idat size"; + case 92: return "integer overflow due to too many pixels"; + case 93: return "zero width or height is invalid"; + case 94: return "header chunk must have a size of 13 bytes"; + case 95: return "integer overflow with combined idat chunk size"; + case 96: return "invalid gAMA chunk size"; + case 97: return "invalid cHRM chunk size"; + case 98: return "invalid sRGB chunk size"; + case 99: return "invalid sRGB rendering intent"; + case 100: return "invalid ICC profile color type, the PNG specification only allows RGB or GRAY"; + case 101: return "PNG specification does not allow RGB ICC profile on gray color types and vice versa"; + case 102: return "not allowed to set grayscale ICC profile with colored pixels by PNG specification"; + case 103: return "invalid palette index in bKGD chunk. Maybe it came before PLTE chunk?"; + case 104: return "invalid bKGD color while encoding (e.g. palette index out of range)"; + case 105: return "integer overflow of bitsize"; + case 106: return "PNG file must have PLTE chunk if color type is palette"; + case 107: return "color convert from palette mode requested without setting the palette data in it"; + case 108: return "tried to add more than 256 values to a palette"; + /*this limit can be configured in LodePNGDecompressSettings*/ + case 109: return "tried to decompress zlib or deflate data larger than desired max_output_size"; + case 110: return "custom zlib or inflate decompression failed"; + case 111: return "custom zlib or deflate compression failed"; + /*max text size limit can be configured in LodePNGDecoderSettings. This error prevents + unreasonable memory consumption when decoding due to impossibly large text sizes.*/ + case 112: return "compressed text unreasonably large"; + /*max ICC size limit can be configured in LodePNGDecoderSettings. This error prevents + unreasonable memory consumption when decoding due to impossibly large ICC profile*/ + case 113: return "ICC profile unreasonably large"; + case 114: return "sBIT chunk has wrong size for the color type of the image"; + case 115: return "sBIT value out of range"; + } + return "unknown error code"; +} +#endif /*LODEPNG_COMPILE_ERROR_TEXT*/ + +/* ////////////////////////////////////////////////////////////////////////// */ +/* ////////////////////////////////////////////////////////////////////////// */ +/* // C++ Wrapper // */ +/* ////////////////////////////////////////////////////////////////////////// */ +/* ////////////////////////////////////////////////////////////////////////// */ + +#ifdef LODEPNG_COMPILE_CPP +namespace lodepng { + +#ifdef LODEPNG_COMPILE_DISK +unsigned load_file(std::vector& buffer, const std::string& filename) { + long size = lodepng_filesize(filename.c_str()); + if(size < 0) return 78; + buffer.resize((size_t)size); + return size == 0 ? 0 : lodepng_buffer_file(&buffer[0], (size_t)size, filename.c_str()); +} + +/*write given buffer to the file, overwriting the file, it doesn't append to it.*/ +unsigned save_file(const std::vector& buffer, const std::string& filename) { + return lodepng_save_file(buffer.empty() ? 0 : &buffer[0], buffer.size(), filename.c_str()); +} +#endif /* LODEPNG_COMPILE_DISK */ + +#ifdef LODEPNG_COMPILE_ZLIB +#ifdef LODEPNG_COMPILE_DECODER +unsigned decompress(std::vector& out, const unsigned char* in, size_t insize, + const LodePNGDecompressSettings& settings) { + unsigned char* buffer = 0; + size_t buffersize = 0; + unsigned error = zlib_decompress(&buffer, &buffersize, 0, in, insize, &settings); + if(buffer) { + out.insert(out.end(), buffer, &buffer[buffersize]); + lodepng_free(buffer); + } + return error; +} + +unsigned decompress(std::vector& out, const std::vector& in, + const LodePNGDecompressSettings& settings) { + return decompress(out, in.empty() ? 0 : &in[0], in.size(), settings); +} +#endif /* LODEPNG_COMPILE_DECODER */ + +#ifdef LODEPNG_COMPILE_ENCODER +unsigned compress(std::vector& out, const unsigned char* in, size_t insize, + const LodePNGCompressSettings& settings) { + unsigned char* buffer = 0; + size_t buffersize = 0; + unsigned error = zlib_compress(&buffer, &buffersize, in, insize, &settings); + if(buffer) { + out.insert(out.end(), buffer, &buffer[buffersize]); + lodepng_free(buffer); + } + return error; +} + +unsigned compress(std::vector& out, const std::vector& in, + const LodePNGCompressSettings& settings) { + return compress(out, in.empty() ? 0 : &in[0], in.size(), settings); +} +#endif /* LODEPNG_COMPILE_ENCODER */ +#endif /* LODEPNG_COMPILE_ZLIB */ + + +#ifdef LODEPNG_COMPILE_PNG + +State::State() { + lodepng_state_init(this); +} + +State::State(const State& other) { + lodepng_state_init(this); + lodepng_state_copy(this, &other); +} + +State::~State() { + lodepng_state_cleanup(this); +} + +State& State::operator=(const State& other) { + lodepng_state_copy(this, &other); + return *this; +} + +#ifdef LODEPNG_COMPILE_DECODER + +unsigned decode(std::vector& out, unsigned& w, unsigned& h, const unsigned char* in, + size_t insize, LodePNGColorType colortype, unsigned bitdepth) { + unsigned char* buffer = 0; + unsigned error = lodepng_decode_memory(&buffer, &w, &h, in, insize, colortype, bitdepth); + if(buffer && !error) { + State state; + state.info_raw.colortype = colortype; + state.info_raw.bitdepth = bitdepth; + size_t buffersize = lodepng_get_raw_size(w, h, &state.info_raw); + out.insert(out.end(), buffer, &buffer[buffersize]); + } + lodepng_free(buffer); + return error; +} + +unsigned decode(std::vector& out, unsigned& w, unsigned& h, + const std::vector& in, LodePNGColorType colortype, unsigned bitdepth) { + return decode(out, w, h, in.empty() ? 0 : &in[0], (unsigned)in.size(), colortype, bitdepth); +} + +unsigned decode(std::vector& out, unsigned& w, unsigned& h, + State& state, + const unsigned char* in, size_t insize) { + unsigned char* buffer = NULL; + unsigned error = lodepng_decode(&buffer, &w, &h, &state, in, insize); + if(buffer && !error) { + size_t buffersize = lodepng_get_raw_size(w, h, &state.info_raw); + out.insert(out.end(), buffer, &buffer[buffersize]); + } + lodepng_free(buffer); + return error; +} + +unsigned decode(std::vector& out, unsigned& w, unsigned& h, + State& state, + const std::vector& in) { + return decode(out, w, h, state, in.empty() ? 0 : &in[0], in.size()); +} + +#ifdef LODEPNG_COMPILE_DISK +unsigned decode(std::vector& out, unsigned& w, unsigned& h, const std::string& filename, + LodePNGColorType colortype, unsigned bitdepth) { + std::vector buffer; + /* safe output values in case error happens */ + w = h = 0; + unsigned error = load_file(buffer, filename); + if(error) return error; + return decode(out, w, h, buffer, colortype, bitdepth); +} +#endif /* LODEPNG_COMPILE_DECODER */ +#endif /* LODEPNG_COMPILE_DISK */ + +#ifdef LODEPNG_COMPILE_ENCODER +unsigned encode(std::vector& out, const unsigned char* in, unsigned w, unsigned h, + LodePNGColorType colortype, unsigned bitdepth) { + unsigned char* buffer; + size_t buffersize; + unsigned error = lodepng_encode_memory(&buffer, &buffersize, in, w, h, colortype, bitdepth); + if(buffer) { + out.insert(out.end(), buffer, &buffer[buffersize]); + lodepng_free(buffer); + } + return error; +} + +unsigned encode(std::vector& out, + const std::vector& in, unsigned w, unsigned h, + LodePNGColorType colortype, unsigned bitdepth) { + if(lodepng_get_raw_size_lct(w, h, colortype, bitdepth) > in.size()) return 84; + return encode(out, in.empty() ? 0 : &in[0], w, h, colortype, bitdepth); +} + +unsigned encode(std::vector& out, + const unsigned char* in, unsigned w, unsigned h, + State& state) { + unsigned char* buffer; + size_t buffersize; + unsigned error = lodepng_encode(&buffer, &buffersize, in, w, h, &state); + if(buffer) { + out.insert(out.end(), buffer, &buffer[buffersize]); + lodepng_free(buffer); + } + return error; +} + +unsigned encode(std::vector& out, + const std::vector& in, unsigned w, unsigned h, + State& state) { + if(lodepng_get_raw_size(w, h, &state.info_raw) > in.size()) return 84; + return encode(out, in.empty() ? 0 : &in[0], w, h, state); +} + +#ifdef LODEPNG_COMPILE_DISK +unsigned encode(const std::string& filename, + const unsigned char* in, unsigned w, unsigned h, + LodePNGColorType colortype, unsigned bitdepth) { + std::vector buffer; + unsigned error = encode(buffer, in, w, h, colortype, bitdepth); + if(!error) error = save_file(buffer, filename); + return error; +} + +unsigned encode(const std::string& filename, + const std::vector& in, unsigned w, unsigned h, + LodePNGColorType colortype, unsigned bitdepth) { + if(lodepng_get_raw_size_lct(w, h, colortype, bitdepth) > in.size()) return 84; + return encode(filename, in.empty() ? 0 : &in[0], w, h, colortype, bitdepth); +} +#endif /* LODEPNG_COMPILE_DISK */ +#endif /* LODEPNG_COMPILE_ENCODER */ +#endif /* LODEPNG_COMPILE_PNG */ +} /* namespace lodepng */ +#endif /*LODEPNG_COMPILE_CPP*/ diff --git a/libs/litehtml/containers/test/lodepng.h b/libs/litehtml/containers/test/lodepng.h new file mode 100644 index 0000000000..7f0190d8d4 --- /dev/null +++ b/libs/litehtml/containers/test/lodepng.h @@ -0,0 +1,2085 @@ +/* +LodePNG version 20221108 + +Copyright (c) 2005-2022 Lode Vandevenne + +This software is provided 'as-is', without any express or implied +warranty. In no event will the authors be held liable for any damages +arising from the use of this software. + +Permission is granted to anyone to use this software for any purpose, +including commercial applications, and to alter it and redistribute it +freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + + 3. This notice may not be removed or altered from any source + distribution. +*/ + +#ifndef LODEPNG_H +#define LODEPNG_H + +#include /*for size_t*/ + +extern const char* LODEPNG_VERSION_STRING; + +/* +The following #defines are used to create code sections. They can be disabled +to disable code sections, which can give faster compile time and smaller binary. +The "NO_COMPILE" defines are designed to be used to pass as defines to the +compiler command to disable them without modifying this header, e.g. +-DLODEPNG_NO_COMPILE_ZLIB for gcc or clang. +*/ +/*deflate & zlib. If disabled, you must specify alternative zlib functions in +the custom_zlib field of the compress and decompress settings*/ +#ifndef LODEPNG_NO_COMPILE_ZLIB +/*pass -DLODEPNG_NO_COMPILE_ZLIB to the compiler to disable this, or comment out LODEPNG_COMPILE_ZLIB below*/ +#define LODEPNG_COMPILE_ZLIB +#endif + +/*png encoder and png decoder*/ +#ifndef LODEPNG_NO_COMPILE_PNG +/*pass -DLODEPNG_NO_COMPILE_PNG to the compiler to disable this, or comment out LODEPNG_COMPILE_PNG below*/ +#define LODEPNG_COMPILE_PNG +#endif + +/*deflate&zlib decoder and png decoder*/ +#ifndef LODEPNG_NO_COMPILE_DECODER +/*pass -DLODEPNG_NO_COMPILE_DECODER to the compiler to disable this, or comment out LODEPNG_COMPILE_DECODER below*/ +#define LODEPNG_COMPILE_DECODER +#endif + +/*deflate&zlib encoder and png encoder*/ +#ifndef LODEPNG_NO_COMPILE_ENCODER +/*pass -DLODEPNG_NO_COMPILE_ENCODER to the compiler to disable this, or comment out LODEPNG_COMPILE_ENCODER below*/ +#define LODEPNG_COMPILE_ENCODER +#endif + +/*the optional built in harddisk file loading and saving functions*/ +#ifndef LODEPNG_NO_COMPILE_DISK +/*pass -DLODEPNG_NO_COMPILE_DISK to the compiler to disable this, or comment out LODEPNG_COMPILE_DISK below*/ +#define LODEPNG_COMPILE_DISK +#endif + +/*support for chunks other than IHDR, IDAT, PLTE, tRNS, IEND: ancillary and unknown chunks*/ +#ifndef LODEPNG_NO_COMPILE_ANCILLARY_CHUNKS +/*pass -DLODEPNG_NO_COMPILE_ANCILLARY_CHUNKS to the compiler to disable this, +or comment out LODEPNG_COMPILE_ANCILLARY_CHUNKS below*/ +#define LODEPNG_COMPILE_ANCILLARY_CHUNKS +#endif + +/*ability to convert error numerical codes to English text string*/ +#ifndef LODEPNG_NO_COMPILE_ERROR_TEXT +/*pass -DLODEPNG_NO_COMPILE_ERROR_TEXT to the compiler to disable this, +or comment out LODEPNG_COMPILE_ERROR_TEXT below*/ +#define LODEPNG_COMPILE_ERROR_TEXT +#endif + +/*Compile the default allocators (C's free, malloc and realloc). If you disable this, +you can define the functions lodepng_free, lodepng_malloc and lodepng_realloc in your +source files with custom allocators.*/ +#ifndef LODEPNG_NO_COMPILE_ALLOCATORS +/*pass -DLODEPNG_NO_COMPILE_ALLOCATORS to the compiler to disable the built-in ones, +or comment out LODEPNG_COMPILE_ALLOCATORS below*/ +#define LODEPNG_COMPILE_ALLOCATORS +#endif + +/*Disable built-in CRC function, in that case a custom implementation of +lodepng_crc32 must be defined externally so that it can be linked in.*/ +#ifndef LODEPNG_NO_COMPILE_CRC +/*pass -DLODEPNG_NO_COMPILE_CRC to the compiler to disable the built-in one, +or comment out LODEPNG_COMPILE_CRC below*/ +#define LODEPNG_COMPILE_CRC +#endif + +/*compile the C++ version (you can disable the C++ wrapper here even when compiling for C++)*/ +#ifdef __cplusplus +#ifndef LODEPNG_NO_COMPILE_CPP +/*pass -DLODEPNG_NO_COMPILE_CPP to the compiler to disable C++ (not needed if a C-only compiler), +or comment out LODEPNG_COMPILE_CPP below*/ +#define LODEPNG_COMPILE_CPP +#endif +#endif + +#ifdef LODEPNG_COMPILE_CPP +#include +#include +#endif /*LODEPNG_COMPILE_CPP*/ + +#ifdef LODEPNG_COMPILE_PNG +/*The PNG color types (also used for raw image).*/ +typedef enum LodePNGColorType { + LCT_GREY = 0, /*grayscale: 1,2,4,8,16 bit*/ + LCT_RGB = 2, /*RGB: 8,16 bit*/ + LCT_PALETTE = 3, /*palette: 1,2,4,8 bit*/ + LCT_GREY_ALPHA = 4, /*grayscale with alpha: 8,16 bit*/ + LCT_RGBA = 6, /*RGB with alpha: 8,16 bit*/ + /*LCT_MAX_OCTET_VALUE lets the compiler allow this enum to represent any invalid + byte value from 0 to 255 that could be present in an invalid PNG file header. Do + not use, compare with or set the name LCT_MAX_OCTET_VALUE, instead either use + the valid color type names above, or numeric values like 1 or 7 when checking for + particular disallowed color type byte values, or cast to integer to print it.*/ + LCT_MAX_OCTET_VALUE = 255 +} LodePNGColorType; + +#ifdef LODEPNG_COMPILE_DECODER +/* +Converts PNG data in memory to raw pixel data. +out: Output parameter. Pointer to buffer that will contain the raw pixel data. + After decoding, its size is w * h * (bytes per pixel) bytes larger than + initially. Bytes per pixel depends on colortype and bitdepth. + Must be freed after usage with free(*out). + Note: for 16-bit per channel colors, uses big endian format like PNG does. +w: Output parameter. Pointer to width of pixel data. +h: Output parameter. Pointer to height of pixel data. +in: Memory buffer with the PNG file. +insize: size of the in buffer. +colortype: the desired color type for the raw output image. See explanation on PNG color types. +bitdepth: the desired bit depth for the raw output image. See explanation on PNG color types. +Return value: LodePNG error code (0 means no error). +*/ +unsigned lodepng_decode_memory(unsigned char** out, unsigned* w, unsigned* h, + const unsigned char* in, size_t insize, + LodePNGColorType colortype, unsigned bitdepth); + +/*Same as lodepng_decode_memory, but always decodes to 32-bit RGBA raw image*/ +unsigned lodepng_decode32(unsigned char** out, unsigned* w, unsigned* h, + const unsigned char* in, size_t insize); + +/*Same as lodepng_decode_memory, but always decodes to 24-bit RGB raw image*/ +unsigned lodepng_decode24(unsigned char** out, unsigned* w, unsigned* h, + const unsigned char* in, size_t insize); + +#ifdef LODEPNG_COMPILE_DISK +/* +Load PNG from disk, from file with given name. +Same as the other decode functions, but instead takes a filename as input. + +NOTE: Wide-character filenames are not supported, you can use an external method +to handle such files and decode in-memory.*/ +unsigned lodepng_decode_file(unsigned char** out, unsigned* w, unsigned* h, + const char* filename, + LodePNGColorType colortype, unsigned bitdepth); + +/*Same as lodepng_decode_file, but always decodes to 32-bit RGBA raw image. + +NOTE: Wide-character filenames are not supported, you can use an external method +to handle such files and decode in-memory.*/ +unsigned lodepng_decode32_file(unsigned char** out, unsigned* w, unsigned* h, + const char* filename); + +/*Same as lodepng_decode_file, but always decodes to 24-bit RGB raw image. + +NOTE: Wide-character filenames are not supported, you can use an external method +to handle such files and decode in-memory.*/ +unsigned lodepng_decode24_file(unsigned char** out, unsigned* w, unsigned* h, + const char* filename); +#endif /*LODEPNG_COMPILE_DISK*/ +#endif /*LODEPNG_COMPILE_DECODER*/ + + +#ifdef LODEPNG_COMPILE_ENCODER +/* +Converts raw pixel data into a PNG image in memory. The colortype and bitdepth + of the output PNG image cannot be chosen, they are automatically determined + by the colortype, bitdepth and content of the input pixel data. + Note: for 16-bit per channel colors, needs big endian format like PNG does. +out: Output parameter. Pointer to buffer that will contain the PNG image data. + Must be freed after usage with free(*out). +outsize: Output parameter. Pointer to the size in bytes of the out buffer. +image: The raw pixel data to encode. The size of this buffer should be + w * h * (bytes per pixel), bytes per pixel depends on colortype and bitdepth. +w: width of the raw pixel data in pixels. +h: height of the raw pixel data in pixels. +colortype: the color type of the raw input image. See explanation on PNG color types. +bitdepth: the bit depth of the raw input image. See explanation on PNG color types. +Return value: LodePNG error code (0 means no error). +*/ +unsigned lodepng_encode_memory(unsigned char** out, size_t* outsize, + const unsigned char* image, unsigned w, unsigned h, + LodePNGColorType colortype, unsigned bitdepth); + +/*Same as lodepng_encode_memory, but always encodes from 32-bit RGBA raw image.*/ +unsigned lodepng_encode32(unsigned char** out, size_t* outsize, + const unsigned char* image, unsigned w, unsigned h); + +/*Same as lodepng_encode_memory, but always encodes from 24-bit RGB raw image.*/ +unsigned lodepng_encode24(unsigned char** out, size_t* outsize, + const unsigned char* image, unsigned w, unsigned h); + +#ifdef LODEPNG_COMPILE_DISK +/* +Converts raw pixel data into a PNG file on disk. +Same as the other encode functions, but instead takes a filename as output. + +NOTE: This overwrites existing files without warning! + +NOTE: Wide-character filenames are not supported, you can use an external method +to handle such files and encode in-memory.*/ +unsigned lodepng_encode_file(const char* filename, + const unsigned char* image, unsigned w, unsigned h, + LodePNGColorType colortype, unsigned bitdepth); + +/*Same as lodepng_encode_file, but always encodes from 32-bit RGBA raw image. + +NOTE: Wide-character filenames are not supported, you can use an external method +to handle such files and encode in-memory.*/ +unsigned lodepng_encode32_file(const char* filename, + const unsigned char* image, unsigned w, unsigned h); + +/*Same as lodepng_encode_file, but always encodes from 24-bit RGB raw image. + +NOTE: Wide-character filenames are not supported, you can use an external method +to handle such files and encode in-memory.*/ +unsigned lodepng_encode24_file(const char* filename, + const unsigned char* image, unsigned w, unsigned h); +#endif /*LODEPNG_COMPILE_DISK*/ +#endif /*LODEPNG_COMPILE_ENCODER*/ + + +#ifdef LODEPNG_COMPILE_CPP +namespace lodepng { +#ifdef LODEPNG_COMPILE_DECODER +/*Same as lodepng_decode_memory, but decodes to an std::vector. The colortype +is the format to output the pixels to. Default is RGBA 8-bit per channel.*/ +unsigned decode(std::vector& out, unsigned& w, unsigned& h, + const unsigned char* in, size_t insize, + LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); +unsigned decode(std::vector& out, unsigned& w, unsigned& h, + const std::vector& in, + LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); +#ifdef LODEPNG_COMPILE_DISK +/* +Converts PNG file from disk to raw pixel data in memory. +Same as the other decode functions, but instead takes a filename as input. + +NOTE: Wide-character filenames are not supported, you can use an external method +to handle such files and decode in-memory. +*/ +unsigned decode(std::vector& out, unsigned& w, unsigned& h, + const std::string& filename, + LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); +#endif /* LODEPNG_COMPILE_DISK */ +#endif /* LODEPNG_COMPILE_DECODER */ + +#ifdef LODEPNG_COMPILE_ENCODER +/*Same as lodepng_encode_memory, but encodes to an std::vector. colortype +is that of the raw input data. The output PNG color type will be auto chosen.*/ +unsigned encode(std::vector& out, + const unsigned char* in, unsigned w, unsigned h, + LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); +unsigned encode(std::vector& out, + const std::vector& in, unsigned w, unsigned h, + LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); +#ifdef LODEPNG_COMPILE_DISK +/* +Converts 32-bit RGBA raw pixel data into a PNG file on disk. +Same as the other encode functions, but instead takes a filename as output. + +NOTE: This overwrites existing files without warning! + +NOTE: Wide-character filenames are not supported, you can use an external method +to handle such files and decode in-memory. +*/ +unsigned encode(const std::string& filename, + const unsigned char* in, unsigned w, unsigned h, + LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); +unsigned encode(const std::string& filename, + const std::vector& in, unsigned w, unsigned h, + LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8); +#endif /* LODEPNG_COMPILE_DISK */ +#endif /* LODEPNG_COMPILE_ENCODER */ +} /* namespace lodepng */ +#endif /*LODEPNG_COMPILE_CPP*/ +#endif /*LODEPNG_COMPILE_PNG*/ + +#ifdef LODEPNG_COMPILE_ERROR_TEXT +/*Returns an English description of the numerical error code.*/ +const char* lodepng_error_text(unsigned code); +#endif /*LODEPNG_COMPILE_ERROR_TEXT*/ + +#ifdef LODEPNG_COMPILE_DECODER +/*Settings for zlib decompression*/ +typedef struct LodePNGDecompressSettings LodePNGDecompressSettings; +struct LodePNGDecompressSettings { + /* Check LodePNGDecoderSettings for more ignorable errors such as ignore_crc */ + unsigned ignore_adler32; /*if 1, continue and don't give an error message if the Adler32 checksum is corrupted*/ + unsigned ignore_nlen; /*ignore complement of len checksum in uncompressed blocks*/ + + /*Maximum decompressed size, beyond this the decoder may (and is encouraged to) stop decoding, + return an error, output a data size > max_output_size and all the data up to that point. This is + not hard limit nor a guarantee, but can prevent excessive memory usage. This setting is + ignored by the PNG decoder, but is used by the deflate/zlib decoder and can be used by custom ones. + Set to 0 to impose no limit (the default).*/ + size_t max_output_size; + + /*use custom zlib decoder instead of built in one (default: null). + Should return 0 if success, any non-0 if error (numeric value not exposed).*/ + unsigned (*custom_zlib)(unsigned char**, size_t*, + const unsigned char*, size_t, + const LodePNGDecompressSettings*); + /*use custom deflate decoder instead of built in one (default: null) + if custom_zlib is not null, custom_inflate is ignored (the zlib format uses deflate). + Should return 0 if success, any non-0 if error (numeric value not exposed).*/ + unsigned (*custom_inflate)(unsigned char**, size_t*, + const unsigned char*, size_t, + const LodePNGDecompressSettings*); + + const void* custom_context; /*optional custom settings for custom functions*/ +}; + +extern const LodePNGDecompressSettings lodepng_default_decompress_settings; +void lodepng_decompress_settings_init(LodePNGDecompressSettings* settings); +#endif /*LODEPNG_COMPILE_DECODER*/ + +#ifdef LODEPNG_COMPILE_ENCODER +/* +Settings for zlib compression. Tweaking these settings tweaks the balance +between speed and compression ratio. +*/ +typedef struct LodePNGCompressSettings LodePNGCompressSettings; +struct LodePNGCompressSettings /*deflate = compress*/ { + /*LZ77 related settings*/ + unsigned btype; /*the block type for LZ (0, 1, 2 or 3, see zlib standard). Should be 2 for proper compression.*/ + unsigned use_lz77; /*whether or not to use LZ77. Should be 1 for proper compression.*/ + unsigned windowsize; /*must be a power of two <= 32768. higher compresses more but is slower. Default value: 2048.*/ + unsigned minmatch; /*minimum lz77 length. 3 is normally best, 6 can be better for some PNGs. Default: 0*/ + unsigned nicematch; /*stop searching if >= this length found. Set to 258 for best compression. Default: 128*/ + unsigned lazymatching; /*use lazy matching: better compression but a bit slower. Default: true*/ + + /*use custom zlib encoder instead of built in one (default: null)*/ + unsigned (*custom_zlib)(unsigned char**, size_t*, + const unsigned char*, size_t, + const LodePNGCompressSettings*); + /*use custom deflate encoder instead of built in one (default: null) + if custom_zlib is used, custom_deflate is ignored since only the built in + zlib function will call custom_deflate*/ + unsigned (*custom_deflate)(unsigned char**, size_t*, + const unsigned char*, size_t, + const LodePNGCompressSettings*); + + const void* custom_context; /*optional custom settings for custom functions*/ +}; + +extern const LodePNGCompressSettings lodepng_default_compress_settings; +void lodepng_compress_settings_init(LodePNGCompressSettings* settings); +#endif /*LODEPNG_COMPILE_ENCODER*/ + +#ifdef LODEPNG_COMPILE_PNG +/* +Color mode of an image. Contains all information required to decode the pixel +bits to RGBA colors. This information is the same as used in the PNG file +format, and is used both for PNG and raw image data in LodePNG. +*/ +typedef struct LodePNGColorMode { + /*header (IHDR)*/ + LodePNGColorType colortype; /*color type, see PNG standard or documentation further in this header file*/ + unsigned bitdepth; /*bits per sample, see PNG standard or documentation further in this header file*/ + + /* + palette (PLTE and tRNS) + + Dynamically allocated with the colors of the palette, including alpha. + This field may not be allocated directly, use lodepng_color_mode_init first, + then lodepng_palette_add per color to correctly initialize it (to ensure size + of exactly 1024 bytes). + + The alpha channels must be set as well, set them to 255 for opaque images. + + When decoding, with the default settings you can ignore this palette, since + LodePNG already fills the palette colors in the pixels of the raw RGBA output, + but when decoding to the original PNG color mode it is needed to reconstruct + the colors. + + The palette is only supported for color type 3. + */ + unsigned char* palette; /*palette in RGBARGBA... order. Must be either 0, or when allocated must have 1024 bytes*/ + size_t palettesize; /*palette size in number of colors (amount of used bytes is 4 * palettesize)*/ + + /* + transparent color key (tRNS) + + This color uses the same bit depth as the bitdepth value in this struct, which can be 1-bit to 16-bit. + For grayscale PNGs, r, g and b will all 3 be set to the same. + + When decoding, by default you can ignore this information, since LodePNG sets + pixels with this key to transparent already in the raw RGBA output. + + The color key is only supported for color types 0 and 2. + */ + unsigned key_defined; /*is a transparent color key given? 0 = false, 1 = true*/ + unsigned key_r; /*red/grayscale component of color key*/ + unsigned key_g; /*green component of color key*/ + unsigned key_b; /*blue component of color key*/ +} LodePNGColorMode; + +/*init, cleanup and copy functions to use with this struct*/ +void lodepng_color_mode_init(LodePNGColorMode* info); +void lodepng_color_mode_cleanup(LodePNGColorMode* info); +/*return value is error code (0 means no error)*/ +unsigned lodepng_color_mode_copy(LodePNGColorMode* dest, const LodePNGColorMode* source); +/* Makes a temporary LodePNGColorMode that does not need cleanup (no palette) */ +LodePNGColorMode lodepng_color_mode_make(LodePNGColorType colortype, unsigned bitdepth); + +void lodepng_palette_clear(LodePNGColorMode* info); +/*add 1 color to the palette*/ +unsigned lodepng_palette_add(LodePNGColorMode* info, + unsigned char r, unsigned char g, unsigned char b, unsigned char a); + +/*get the total amount of bits per pixel, based on colortype and bitdepth in the struct*/ +unsigned lodepng_get_bpp(const LodePNGColorMode* info); +/*get the amount of color channels used, based on colortype in the struct. +If a palette is used, it counts as 1 channel.*/ +unsigned lodepng_get_channels(const LodePNGColorMode* info); +/*is it a grayscale type? (only colortype 0 or 4)*/ +unsigned lodepng_is_greyscale_type(const LodePNGColorMode* info); +/*has it got an alpha channel? (only colortype 2 or 6)*/ +unsigned lodepng_is_alpha_type(const LodePNGColorMode* info); +/*has it got a palette? (only colortype 3)*/ +unsigned lodepng_is_palette_type(const LodePNGColorMode* info); +/*only returns true if there is a palette and there is a value in the palette with alpha < 255. +Loops through the palette to check this.*/ +unsigned lodepng_has_palette_alpha(const LodePNGColorMode* info); +/* +Check if the given color info indicates the possibility of having non-opaque pixels in the PNG image. +Returns true if the image can have translucent or invisible pixels (it still be opaque if it doesn't use such pixels). +Returns false if the image can only have opaque pixels. +In detail, it returns true only if it's a color type with alpha, or has a palette with non-opaque values, +or if "key_defined" is true. +*/ +unsigned lodepng_can_have_alpha(const LodePNGColorMode* info); +/*Returns the byte size of a raw image buffer with given width, height and color mode*/ +size_t lodepng_get_raw_size(unsigned w, unsigned h, const LodePNGColorMode* color); + +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS +/*The information of a Time chunk in PNG.*/ +typedef struct LodePNGTime { + unsigned year; /*2 bytes used (0-65535)*/ + unsigned month; /*1-12*/ + unsigned day; /*1-31*/ + unsigned hour; /*0-23*/ + unsigned minute; /*0-59*/ + unsigned second; /*0-60 (to allow for leap seconds)*/ +} LodePNGTime; +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + +/*Information about the PNG image, except pixels, width and height.*/ +typedef struct LodePNGInfo { + /*header (IHDR), palette (PLTE) and transparency (tRNS) chunks*/ + unsigned compression_method;/*compression method of the original file. Always 0.*/ + unsigned filter_method; /*filter method of the original file*/ + unsigned interlace_method; /*interlace method of the original file: 0=none, 1=Adam7*/ + LodePNGColorMode color; /*color type and bits, palette and transparency of the PNG file*/ + +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + /* + Suggested background color chunk (bKGD) + + This uses the same color mode and bit depth as the PNG (except no alpha channel), + with values truncated to the bit depth in the unsigned integer. + + For grayscale and palette PNGs, the value is stored in background_r. The values + in background_g and background_b are then unused. The decoder will set them + equal to background_r, the encoder ignores them in this case. + + When decoding, you may get these in a different color mode than the one you requested + for the raw pixels: the colortype and bitdepth defined by info_png.color, that is the + ones defined in the header of the PNG image, are used. + + When encoding with auto_convert, you must use the color model defined in info_png.color for + these values. The encoder normally ignores info_png.color when auto_convert is on, but will + use it to interpret these values (and convert copies of them to its chosen color model). + + When encoding, avoid setting this to an expensive color, such as a non-gray value + when the image is gray, or the compression will be worse since it will be forced to + write the PNG with a more expensive color mode (when auto_convert is on). + + The decoder does not use this background color to edit the color of pixels. This is a + completely optional metadata feature. + */ + unsigned background_defined; /*is a suggested background color given?*/ + unsigned background_r; /*red/gray/palette component of suggested background color*/ + unsigned background_g; /*green component of suggested background color*/ + unsigned background_b; /*blue component of suggested background color*/ + + /* + Non-international text chunks (tEXt and zTXt) + + The char** arrays each contain num strings. The actual messages are in + text_strings, while text_keys are keywords that give a short description what + the actual text represents, e.g. Title, Author, Description, or anything else. + + All the string fields below including strings, keys, names and language tags are null terminated. + The PNG specification uses null characters for the keys, names and tags, and forbids null + characters to appear in the main text which is why we can use null termination everywhere here. + + A keyword is minimum 1 character and maximum 79 characters long (plus the + additional null terminator). It's discouraged to use a single line length + longer than 79 characters for texts. + + Don't allocate these text buffers yourself. Use the init/cleanup functions + correctly and use lodepng_add_text and lodepng_clear_text. + + Standard text chunk keywords and strings are encoded using Latin-1. + */ + size_t text_num; /*the amount of texts in these char** buffers (there may be more texts in itext)*/ + char** text_keys; /*the keyword of a text chunk (e.g. "Comment")*/ + char** text_strings; /*the actual text*/ + + /* + International text chunks (iTXt) + Similar to the non-international text chunks, but with additional strings + "langtags" and "transkeys", and the following text encodings are used: + keys: Latin-1, langtags: ASCII, transkeys and strings: UTF-8. + keys must be 1-79 characters (plus the additional null terminator), the other + strings are any length. + */ + size_t itext_num; /*the amount of international texts in this PNG*/ + char** itext_keys; /*the English keyword of the text chunk (e.g. "Comment")*/ + char** itext_langtags; /*language tag for this text's language, ISO/IEC 646 string, e.g. ISO 639 language tag*/ + char** itext_transkeys; /*keyword translated to the international language - UTF-8 string*/ + char** itext_strings; /*the actual international text - UTF-8 string*/ + + /*time chunk (tIME)*/ + unsigned time_defined; /*set to 1 to make the encoder generate a tIME chunk*/ + LodePNGTime time; + + /*phys chunk (pHYs)*/ + unsigned phys_defined; /*if 0, there is no pHYs chunk and the values below are undefined, if 1 else there is one*/ + unsigned phys_x; /*pixels per unit in x direction*/ + unsigned phys_y; /*pixels per unit in y direction*/ + unsigned phys_unit; /*may be 0 (unknown unit) or 1 (metre)*/ + + /* + Color profile related chunks: gAMA, cHRM, sRGB, iCPP, sBIT + + LodePNG does not apply any color conversions on pixels in the encoder or decoder and does not interpret these color + profile values. It merely passes on the information. If you wish to use color profiles and convert colors, please + use these values with a color management library. + + See the PNG, ICC and sRGB specifications for more information about the meaning of these values. + */ + + /* gAMA chunk: optional, overridden by sRGB or iCCP if those are present. */ + unsigned gama_defined; /* Whether a gAMA chunk is present (0 = not present, 1 = present). */ + unsigned gama_gamma; /* Gamma exponent times 100000 */ + + /* cHRM chunk: optional, overridden by sRGB or iCCP if those are present. */ + unsigned chrm_defined; /* Whether a cHRM chunk is present (0 = not present, 1 = present). */ + unsigned chrm_white_x; /* White Point x times 100000 */ + unsigned chrm_white_y; /* White Point y times 100000 */ + unsigned chrm_red_x; /* Red x times 100000 */ + unsigned chrm_red_y; /* Red y times 100000 */ + unsigned chrm_green_x; /* Green x times 100000 */ + unsigned chrm_green_y; /* Green y times 100000 */ + unsigned chrm_blue_x; /* Blue x times 100000 */ + unsigned chrm_blue_y; /* Blue y times 100000 */ + + /* + sRGB chunk: optional. May not appear at the same time as iCCP. + If gAMA is also present gAMA must contain value 45455. + If cHRM is also present cHRM must contain respectively 31270,32900,64000,33000,30000,60000,15000,6000. + */ + unsigned srgb_defined; /* Whether an sRGB chunk is present (0 = not present, 1 = present). */ + unsigned srgb_intent; /* Rendering intent: 0=perceptual, 1=rel. colorimetric, 2=saturation, 3=abs. colorimetric */ + + /* + iCCP chunk: optional. May not appear at the same time as sRGB. + + LodePNG does not parse or use the ICC profile (except its color space header field for an edge case), a + separate library to handle the ICC data (not included in LodePNG) format is needed to use it for color + management and conversions. + + For encoding, if iCCP is present, gAMA and cHRM are recommended to be added as well with values that match the ICC + profile as closely as possible, if you wish to do this you should provide the correct values for gAMA and cHRM and + enable their '_defined' flags since LodePNG will not automatically compute them from the ICC profile. + + For encoding, the ICC profile is required by the PNG specification to be an "RGB" profile for non-gray + PNG color types and a "GRAY" profile for gray PNG color types. If you disable auto_convert, you must ensure + the ICC profile type matches your requested color type, else the encoder gives an error. If auto_convert is + enabled (the default), and the ICC profile is not a good match for the pixel data, this will result in an encoder + error if the pixel data has non-gray pixels for a GRAY profile, or a silent less-optimal compression of the pixel + data if the pixels could be encoded as grayscale but the ICC profile is RGB. + + To avoid this do not set an ICC profile in the image unless there is a good reason for it, and when doing so + make sure you compute it carefully to avoid the above problems. + */ + unsigned iccp_defined; /* Whether an iCCP chunk is present (0 = not present, 1 = present). */ + char* iccp_name; /* Null terminated string with profile name, 1-79 bytes */ + /* + The ICC profile in iccp_profile_size bytes. + Don't allocate this buffer yourself. Use the init/cleanup functions + correctly and use lodepng_set_icc and lodepng_clear_icc. + */ + unsigned char* iccp_profile; + unsigned iccp_profile_size; /* The size of iccp_profile in bytes */ + + /* + sBIT chunk: significant bits. Optional metadata, only set this if needed. + + If defined, these values give the bit depth of the original data. Since PNG only stores 1, 2, 4, 8 or 16-bit + per channel data, the significant bits value can be used to indicate the original encoded data has another + sample depth, such as 10 or 12. + + Encoders using this value, when storing the pixel data, should use the most significant bits + of the data to store the original bits, and use a good sample depth scaling method such as + "left bit replication" to fill in the least significant bits, rather than fill zeroes. + + Decoders using this value, if able to work with data that's e.g. 10-bit or 12-bit, should right + shift the data to go back to the original bit depth, but decoders are also allowed to ignore + sbit and work e.g. with the 8-bit or 16-bit data from the PNG directly, since thanks + to the encoder contract, the values encoded in PNG are in valid range for the PNG bit depth. + + For grayscale images, sbit_g and sbit_b are not used, and for images that don't use color + type RGBA or grayscale+alpha, sbit_a is not used (it's not used even for palette images with + translucent palette values, or images with color key). The values that are used must be + greater than zero and smaller than or equal to the PNG bit depth. + + The color type from the header in the PNG image defines these used and unused fields: if + decoding with a color mode conversion, such as always decoding to RGBA, this metadata still + only uses the color type of the original PNG, and may e.g. lack the alpha channel info + if the PNG was RGB. When encoding with auto_convert (as well as without), also always the + color model defined in info_png.color determines this. + + NOTE: enabling sbit can hurt compression, because the encoder can then not always use + auto_convert to choose a more optimal color mode for the data, because the PNG format has + strict requirements for the allowed sbit values in combination with color modes. + For example, setting these fields to 10-bit will force the encoder to keep using a 16-bit per channel + color mode, even if the pixel data would in fact fit in a more efficient 8-bit mode. + */ + unsigned sbit_defined; /*is significant bits given? if not, the values below are unused*/ + unsigned sbit_r; /*red or gray component of significant bits*/ + unsigned sbit_g; /*green component of significant bits*/ + unsigned sbit_b; /*blue component of significant bits*/ + unsigned sbit_a; /*alpha component of significant bits*/ + + /* End of color profile related chunks */ + + + /* + unknown chunks: chunks not known by LodePNG, passed on byte for byte. + + There are 3 buffers, one for each position in the PNG where unknown chunks can appear. + Each buffer contains all unknown chunks for that position consecutively. + The 3 positions are: + 0: between IHDR and PLTE, 1: between PLTE and IDAT, 2: between IDAT and IEND. + + For encoding, do not store critical chunks or known chunks that are enabled with a "_defined" flag + above in here, since the encoder will blindly follow this and could then encode an invalid PNG file + (such as one with two IHDR chunks or the disallowed combination of sRGB with iCCP). But do use + this if you wish to store an ancillary chunk that is not supported by LodePNG (such as sPLT or hIST), + or any non-standard PNG chunk. + + Do not allocate or traverse this data yourself. Use the chunk traversing functions declared + later, such as lodepng_chunk_next and lodepng_chunk_append, to read/write this struct. + */ + unsigned char* unknown_chunks_data[3]; + size_t unknown_chunks_size[3]; /*size in bytes of the unknown chunks, given for protection*/ +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ +} LodePNGInfo; + +/*init, cleanup and copy functions to use with this struct*/ +void lodepng_info_init(LodePNGInfo* info); +void lodepng_info_cleanup(LodePNGInfo* info); +/*return value is error code (0 means no error)*/ +unsigned lodepng_info_copy(LodePNGInfo* dest, const LodePNGInfo* source); + +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS +unsigned lodepng_add_text(LodePNGInfo* info, const char* key, const char* str); /*push back both texts at once*/ +void lodepng_clear_text(LodePNGInfo* info); /*use this to clear the texts again after you filled them in*/ + +unsigned lodepng_add_itext(LodePNGInfo* info, const char* key, const char* langtag, + const char* transkey, const char* str); /*push back the 4 texts of 1 chunk at once*/ +void lodepng_clear_itext(LodePNGInfo* info); /*use this to clear the itexts again after you filled them in*/ + +/*replaces if exists*/ +unsigned lodepng_set_icc(LodePNGInfo* info, const char* name, const unsigned char* profile, unsigned profile_size); +void lodepng_clear_icc(LodePNGInfo* info); /*use this to clear the texts again after you filled them in*/ +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ + +/* +Converts raw buffer from one color type to another color type, based on +LodePNGColorMode structs to describe the input and output color type. +See the reference manual at the end of this header file to see which color conversions are supported. +return value = LodePNG error code (0 if all went ok, an error if the conversion isn't supported) +The out buffer must have size (w * h * bpp + 7) / 8, where bpp is the bits per pixel +of the output color type (lodepng_get_bpp). +For < 8 bpp images, there should not be padding bits at the end of scanlines. +For 16-bit per channel colors, uses big endian format like PNG does. +Return value is LodePNG error code +*/ +unsigned lodepng_convert(unsigned char* out, const unsigned char* in, + const LodePNGColorMode* mode_out, const LodePNGColorMode* mode_in, + unsigned w, unsigned h); + +#ifdef LODEPNG_COMPILE_DECODER +/* +Settings for the decoder. This contains settings for the PNG and the Zlib +decoder, but not the Info settings from the Info structs. +*/ +typedef struct LodePNGDecoderSettings { + LodePNGDecompressSettings zlibsettings; /*in here is the setting to ignore Adler32 checksums*/ + + /* Check LodePNGDecompressSettings for more ignorable errors such as ignore_adler32 */ + unsigned ignore_crc; /*ignore CRC checksums*/ + unsigned ignore_critical; /*ignore unknown critical chunks*/ + unsigned ignore_end; /*ignore issues at end of file if possible (missing IEND chunk, too large chunk, ...)*/ + /* TODO: make a system involving warnings with levels and a strict mode instead. Other potentially recoverable + errors: srgb rendering intent value, size of content of ancillary chunks, more than 79 characters for some + strings, placement/combination rules for ancillary chunks, crc of unknown chunks, allowed characters + in string keys, etc... */ + + unsigned color_convert; /*whether to convert the PNG to the color type you want. Default: yes*/ + +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + unsigned read_text_chunks; /*if false but remember_unknown_chunks is true, they're stored in the unknown chunks*/ + + /*store all bytes from unknown chunks in the LodePNGInfo (off by default, useful for a png editor)*/ + unsigned remember_unknown_chunks; + + /* maximum size for decompressed text chunks. If a text chunk's text is larger than this, an error is returned, + unless reading text chunks is disabled or this limit is set higher or disabled. Set to 0 to allow any size. + By default it is a value that prevents unreasonably large strings from hogging memory. */ + size_t max_text_size; + + /* maximum size for compressed ICC chunks. If the ICC profile is larger than this, an error will be returned. Set to + 0 to allow any size. By default this is a value that prevents ICC profiles that would be much larger than any + legitimate profile could be to hog memory. */ + size_t max_icc_size; +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ +} LodePNGDecoderSettings; + +void lodepng_decoder_settings_init(LodePNGDecoderSettings* settings); +#endif /*LODEPNG_COMPILE_DECODER*/ + +#ifdef LODEPNG_COMPILE_ENCODER +/*automatically use color type with less bits per pixel if losslessly possible. Default: AUTO*/ +typedef enum LodePNGFilterStrategy { + /*every filter at zero*/ + LFS_ZERO = 0, + /*every filter at 1, 2, 3 or 4 (paeth), unlike LFS_ZERO not a good choice, but for testing*/ + LFS_ONE = 1, + LFS_TWO = 2, + LFS_THREE = 3, + LFS_FOUR = 4, + /*Use filter that gives minimum sum, as described in the official PNG filter heuristic.*/ + LFS_MINSUM, + /*Use the filter type that gives smallest Shannon entropy for this scanline. Depending + on the image, this is better or worse than minsum.*/ + LFS_ENTROPY, + /* + Brute-force-search PNG filters by compressing each filter for each scanline. + Experimental, very slow, and only rarely gives better compression than MINSUM. + */ + LFS_BRUTE_FORCE, + /*use predefined_filters buffer: you specify the filter type for each scanline*/ + LFS_PREDEFINED +} LodePNGFilterStrategy; + +/*Gives characteristics about the integer RGBA colors of the image (count, alpha channel usage, bit depth, ...), +which helps decide which color model to use for encoding. +Used internally by default if "auto_convert" is enabled. Public because it's useful for custom algorithms.*/ +typedef struct LodePNGColorStats { + unsigned colored; /*not grayscale*/ + unsigned key; /*image is not opaque and color key is possible instead of full alpha*/ + unsigned short key_r; /*key values, always as 16-bit, in 8-bit case the byte is duplicated, e.g. 65535 means 255*/ + unsigned short key_g; + unsigned short key_b; + unsigned alpha; /*image is not opaque and alpha channel or alpha palette required*/ + unsigned numcolors; /*amount of colors, up to 257. Not valid if bits == 16 or allow_palette is disabled.*/ + unsigned char palette[1024]; /*Remembers up to the first 256 RGBA colors, in no particular order, only valid when numcolors is valid*/ + unsigned bits; /*bits per channel (not for palette). 1,2 or 4 for grayscale only. 16 if 16-bit per channel required.*/ + size_t numpixels; + + /*user settings for computing/using the stats*/ + unsigned allow_palette; /*default 1. if 0, disallow choosing palette colortype in auto_choose_color, and don't count numcolors*/ + unsigned allow_greyscale; /*default 1. if 0, choose RGB or RGBA even if the image only has gray colors*/ +} LodePNGColorStats; + +void lodepng_color_stats_init(LodePNGColorStats* stats); + +/*Get a LodePNGColorStats of the image. The stats must already have been inited. +Returns error code (e.g. alloc fail) or 0 if ok.*/ +unsigned lodepng_compute_color_stats(LodePNGColorStats* stats, + const unsigned char* image, unsigned w, unsigned h, + const LodePNGColorMode* mode_in); + +/*Settings for the encoder.*/ +typedef struct LodePNGEncoderSettings { + LodePNGCompressSettings zlibsettings; /*settings for the zlib encoder, such as window size, ...*/ + + unsigned auto_convert; /*automatically choose output PNG color type. Default: true*/ + + /*If true, follows the official PNG heuristic: if the PNG uses a palette or lower than + 8 bit depth, set all filters to zero. Otherwise use the filter_strategy. Note that to + completely follow the official PNG heuristic, filter_palette_zero must be true and + filter_strategy must be LFS_MINSUM*/ + unsigned filter_palette_zero; + /*Which filter strategy to use when not using zeroes due to filter_palette_zero. + Set filter_palette_zero to 0 to ensure always using your chosen strategy. Default: LFS_MINSUM*/ + LodePNGFilterStrategy filter_strategy; + /*used if filter_strategy is LFS_PREDEFINED. In that case, this must point to a buffer with + the same length as the amount of scanlines in the image, and each value must <= 5. You + have to cleanup this buffer, LodePNG will never free it. Don't forget that filter_palette_zero + must be set to 0 to ensure this is also used on palette or low bitdepth images.*/ + const unsigned char* predefined_filters; + + /*force creating a PLTE chunk if colortype is 2 or 6 (= a suggested palette). + If colortype is 3, PLTE is always created. If color type is explicitely set + to a grayscale type (1 or 4), this is not done and is ignored. If enabling this, + a palette must be present in the info_png. + NOTE: enabling this may worsen compression if auto_convert is used to choose + optimal color mode, because it cannot use grayscale color modes in this case*/ + unsigned force_palette; +#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS + /*add LodePNG identifier and version as a text chunk, for debugging*/ + unsigned add_id; + /*encode text chunks as zTXt chunks instead of tEXt chunks, and use compression in iTXt chunks*/ + unsigned text_compression; +#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/ +} LodePNGEncoderSettings; + +void lodepng_encoder_settings_init(LodePNGEncoderSettings* settings); +#endif /*LODEPNG_COMPILE_ENCODER*/ + + +#if defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER) +/*The settings, state and information for extended encoding and decoding.*/ +typedef struct LodePNGState { +#ifdef LODEPNG_COMPILE_DECODER + LodePNGDecoderSettings decoder; /*the decoding settings*/ +#endif /*LODEPNG_COMPILE_DECODER*/ +#ifdef LODEPNG_COMPILE_ENCODER + LodePNGEncoderSettings encoder; /*the encoding settings*/ +#endif /*LODEPNG_COMPILE_ENCODER*/ + LodePNGColorMode info_raw; /*specifies the format in which you would like to get the raw pixel buffer*/ + LodePNGInfo info_png; /*info of the PNG image obtained after decoding*/ + unsigned error; +} LodePNGState; + +/*init, cleanup and copy functions to use with this struct*/ +void lodepng_state_init(LodePNGState* state); +void lodepng_state_cleanup(LodePNGState* state); +void lodepng_state_copy(LodePNGState* dest, const LodePNGState* source); +#endif /* defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER) */ + +#ifdef LODEPNG_COMPILE_DECODER +/* +Same as lodepng_decode_memory, but uses a LodePNGState to allow custom settings and +getting much more information about the PNG image and color mode. +*/ +unsigned lodepng_decode(unsigned char** out, unsigned* w, unsigned* h, + LodePNGState* state, + const unsigned char* in, size_t insize); + +/* +Read the PNG header, but not the actual data. This returns only the information +that is in the IHDR chunk of the PNG, such as width, height and color type. The +information is placed in the info_png field of the LodePNGState. +*/ +unsigned lodepng_inspect(unsigned* w, unsigned* h, + LodePNGState* state, + const unsigned char* in, size_t insize); +#endif /*LODEPNG_COMPILE_DECODER*/ + +/* +Reads one metadata chunk (other than IHDR, which is handled by lodepng_inspect) +of the PNG file and outputs what it read in the state. Returns error code on failure. +Use lodepng_inspect first with a new state, then e.g. lodepng_chunk_find_const +to find the desired chunk type, and if non null use lodepng_inspect_chunk (with +chunk_pointer - start_of_file as pos). +Supports most metadata chunks from the PNG standard (gAMA, bKGD, tEXt, ...). +Ignores unsupported, unknown, non-metadata or IHDR chunks (without error). +Requirements: &in[pos] must point to start of a chunk, must use regular +lodepng_inspect first since format of most other chunks depends on IHDR, and if +there is a PLTE chunk, that one must be inspected before tRNS or bKGD. +*/ +unsigned lodepng_inspect_chunk(LodePNGState* state, size_t pos, + const unsigned char* in, size_t insize); + +#ifdef LODEPNG_COMPILE_ENCODER +/*This function allocates the out buffer with standard malloc and stores the size in *outsize.*/ +unsigned lodepng_encode(unsigned char** out, size_t* outsize, + const unsigned char* image, unsigned w, unsigned h, + LodePNGState* state); +#endif /*LODEPNG_COMPILE_ENCODER*/ + +/* +The lodepng_chunk functions are normally not needed, except to traverse the +unknown chunks stored in the LodePNGInfo struct, or add new ones to it. +It also allows traversing the chunks of an encoded PNG file yourself. + +The chunk pointer always points to the beginning of the chunk itself, that is +the first byte of the 4 length bytes. + +In the PNG file format, chunks have the following format: +-4 bytes length: length of the data of the chunk in bytes (chunk itself is 12 bytes longer) +-4 bytes chunk type (ASCII a-z,A-Z only, see below) +-length bytes of data (may be 0 bytes if length was 0) +-4 bytes of CRC, computed on chunk name + data + +The first chunk starts at the 8th byte of the PNG file, the entire rest of the file +exists out of concatenated chunks with the above format. + +PNG standard chunk ASCII naming conventions: +-First byte: uppercase = critical, lowercase = ancillary +-Second byte: uppercase = public, lowercase = private +-Third byte: must be uppercase +-Fourth byte: uppercase = unsafe to copy, lowercase = safe to copy +*/ + +/* +Gets the length of the data of the chunk. Total chunk length has 12 bytes more. +There must be at least 4 bytes to read from. If the result value is too large, +it may be corrupt data. +*/ +unsigned lodepng_chunk_length(const unsigned char* chunk); + +/*puts the 4-byte type in null terminated string*/ +void lodepng_chunk_type(char type[5], const unsigned char* chunk); + +/*check if the type is the given type*/ +unsigned char lodepng_chunk_type_equals(const unsigned char* chunk, const char* type); + +/*0: it's one of the critical chunk types, 1: it's an ancillary chunk (see PNG standard)*/ +unsigned char lodepng_chunk_ancillary(const unsigned char* chunk); + +/*0: public, 1: private (see PNG standard)*/ +unsigned char lodepng_chunk_private(const unsigned char* chunk); + +/*0: the chunk is unsafe to copy, 1: the chunk is safe to copy (see PNG standard)*/ +unsigned char lodepng_chunk_safetocopy(const unsigned char* chunk); + +/*get pointer to the data of the chunk, where the input points to the header of the chunk*/ +unsigned char* lodepng_chunk_data(unsigned char* chunk); +const unsigned char* lodepng_chunk_data_const(const unsigned char* chunk); + +/*returns 0 if the crc is correct, 1 if it's incorrect (0 for OK as usual!)*/ +unsigned lodepng_chunk_check_crc(const unsigned char* chunk); + +/*generates the correct CRC from the data and puts it in the last 4 bytes of the chunk*/ +void lodepng_chunk_generate_crc(unsigned char* chunk); + +/* +Iterate to next chunks, allows iterating through all chunks of the PNG file. +Input must be at the beginning of a chunk (result of a previous lodepng_chunk_next call, +or the 8th byte of a PNG file which always has the first chunk), or alternatively may +point to the first byte of the PNG file (which is not a chunk but the magic header, the +function will then skip over it and return the first real chunk). +Will output pointer to the start of the next chunk, or at or beyond end of the file if there +is no more chunk after this or possibly if the chunk is corrupt. +Start this process at the 8th byte of the PNG file. +In a non-corrupt PNG file, the last chunk should have name "IEND". +*/ +unsigned char* lodepng_chunk_next(unsigned char* chunk, unsigned char* end); +const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk, const unsigned char* end); + +/*Finds the first chunk with the given type in the range [chunk, end), or returns NULL if not found.*/ +unsigned char* lodepng_chunk_find(unsigned char* chunk, unsigned char* end, const char type[5]); +const unsigned char* lodepng_chunk_find_const(const unsigned char* chunk, const unsigned char* end, const char type[5]); + +/* +Appends chunk to the data in out. The given chunk should already have its chunk header. +The out variable and outsize are updated to reflect the new reallocated buffer. +Returns error code (0 if it went ok) +*/ +unsigned lodepng_chunk_append(unsigned char** out, size_t* outsize, const unsigned char* chunk); + +/* +Appends new chunk to out. The chunk to append is given by giving its length, type +and data separately. The type is a 4-letter string. +The out variable and outsize are updated to reflect the new reallocated buffer. +Returne error code (0 if it went ok) +*/ +unsigned lodepng_chunk_create(unsigned char** out, size_t* outsize, unsigned length, + const char* type, const unsigned char* data); + + +/*Calculate CRC32 of buffer*/ +unsigned lodepng_crc32(const unsigned char* buf, size_t len); +#endif /*LODEPNG_COMPILE_PNG*/ + + +#ifdef LODEPNG_COMPILE_ZLIB +/* +This zlib part can be used independently to zlib compress and decompress a +buffer. It cannot be used to create gzip files however, and it only supports the +part of zlib that is required for PNG, it does not support dictionaries. +*/ + +#ifdef LODEPNG_COMPILE_DECODER +/*Inflate a buffer. Inflate is the decompression step of deflate. Out buffer must be freed after use.*/ +unsigned lodepng_inflate(unsigned char** out, size_t* outsize, + const unsigned char* in, size_t insize, + const LodePNGDecompressSettings* settings); + +/* +Decompresses Zlib data. Reallocates the out buffer and appends the data. The +data must be according to the zlib specification. +Either, *out must be NULL and *outsize must be 0, or, *out must be a valid +buffer and *outsize its size in bytes. out must be freed by user after usage. +*/ +unsigned lodepng_zlib_decompress(unsigned char** out, size_t* outsize, + const unsigned char* in, size_t insize, + const LodePNGDecompressSettings* settings); +#endif /*LODEPNG_COMPILE_DECODER*/ + +#ifdef LODEPNG_COMPILE_ENCODER +/* +Compresses data with Zlib. Reallocates the out buffer and appends the data. +Zlib adds a small header and trailer around the deflate data. +The data is output in the format of the zlib specification. +Either, *out must be NULL and *outsize must be 0, or, *out must be a valid +buffer and *outsize its size in bytes. out must be freed by user after usage. +*/ +unsigned lodepng_zlib_compress(unsigned char** out, size_t* outsize, + const unsigned char* in, size_t insize, + const LodePNGCompressSettings* settings); + +/* +Find length-limited Huffman code for given frequencies. This function is in the +public interface only for tests, it's used internally by lodepng_deflate. +*/ +unsigned lodepng_huffman_code_lengths(unsigned* lengths, const unsigned* frequencies, + size_t numcodes, unsigned maxbitlen); + +/*Compress a buffer with deflate. See RFC 1951. Out buffer must be freed after use.*/ +unsigned lodepng_deflate(unsigned char** out, size_t* outsize, + const unsigned char* in, size_t insize, + const LodePNGCompressSettings* settings); + +#endif /*LODEPNG_COMPILE_ENCODER*/ +#endif /*LODEPNG_COMPILE_ZLIB*/ + +#ifdef LODEPNG_COMPILE_DISK +/* +Load a file from disk into buffer. The function allocates the out buffer, and +after usage you should free it. +out: output parameter, contains pointer to loaded buffer. +outsize: output parameter, size of the allocated out buffer +filename: the path to the file to load +return value: error code (0 means ok) + +NOTE: Wide-character filenames are not supported, you can use an external method +to handle such files and decode in-memory. +*/ +unsigned lodepng_load_file(unsigned char** out, size_t* outsize, const char* filename); + +/* +Save a file from buffer to disk. Warning, if it exists, this function overwrites +the file without warning! +buffer: the buffer to write +buffersize: size of the buffer to write +filename: the path to the file to save to +return value: error code (0 means ok) + +NOTE: Wide-character filenames are not supported, you can use an external method +to handle such files and encode in-memory +*/ +unsigned lodepng_save_file(const unsigned char* buffer, size_t buffersize, const char* filename); +#endif /*LODEPNG_COMPILE_DISK*/ + +#ifdef LODEPNG_COMPILE_CPP +/* The LodePNG C++ wrapper uses std::vectors instead of manually allocated memory buffers. */ +namespace lodepng { +#ifdef LODEPNG_COMPILE_PNG +class State : public LodePNGState { + public: + State(); + State(const State& other); + ~State(); + State& operator=(const State& other); +}; + +#ifdef LODEPNG_COMPILE_DECODER +/* Same as other lodepng::decode, but using a State for more settings and information. */ +unsigned decode(std::vector& out, unsigned& w, unsigned& h, + State& state, + const unsigned char* in, size_t insize); +unsigned decode(std::vector& out, unsigned& w, unsigned& h, + State& state, + const std::vector& in); +#endif /*LODEPNG_COMPILE_DECODER*/ + +#ifdef LODEPNG_COMPILE_ENCODER +/* Same as other lodepng::encode, but using a State for more settings and information. */ +unsigned encode(std::vector& out, + const unsigned char* in, unsigned w, unsigned h, + State& state); +unsigned encode(std::vector& out, + const std::vector& in, unsigned w, unsigned h, + State& state); +#endif /*LODEPNG_COMPILE_ENCODER*/ + +#ifdef LODEPNG_COMPILE_DISK +/* +Load a file from disk into an std::vector. +return value: error code (0 means ok) + +NOTE: Wide-character filenames are not supported, you can use an external method +to handle such files and decode in-memory +*/ +unsigned load_file(std::vector& buffer, const std::string& filename); + +/* +Save the binary data in an std::vector to a file on disk. The file is overwritten +without warning. + +NOTE: Wide-character filenames are not supported, you can use an external method +to handle such files and encode in-memory +*/ +unsigned save_file(const std::vector& buffer, const std::string& filename); +#endif /* LODEPNG_COMPILE_DISK */ +#endif /* LODEPNG_COMPILE_PNG */ + +#ifdef LODEPNG_COMPILE_ZLIB +#ifdef LODEPNG_COMPILE_DECODER +/* Zlib-decompress an unsigned char buffer */ +unsigned decompress(std::vector& out, const unsigned char* in, size_t insize, + const LodePNGDecompressSettings& settings = lodepng_default_decompress_settings); + +/* Zlib-decompress an std::vector */ +unsigned decompress(std::vector& out, const std::vector& in, + const LodePNGDecompressSettings& settings = lodepng_default_decompress_settings); +#endif /* LODEPNG_COMPILE_DECODER */ + +#ifdef LODEPNG_COMPILE_ENCODER +/* Zlib-compress an unsigned char buffer */ +unsigned compress(std::vector& out, const unsigned char* in, size_t insize, + const LodePNGCompressSettings& settings = lodepng_default_compress_settings); + +/* Zlib-compress an std::vector */ +unsigned compress(std::vector& out, const std::vector& in, + const LodePNGCompressSettings& settings = lodepng_default_compress_settings); +#endif /* LODEPNG_COMPILE_ENCODER */ +#endif /* LODEPNG_COMPILE_ZLIB */ +} /* namespace lodepng */ +#endif /*LODEPNG_COMPILE_CPP*/ + +/* +TODO: +[.] test if there are no memory leaks or security exploits - done a lot but needs to be checked often +[.] check compatibility with various compilers - done but needs to be redone for every newer version +[X] converting color to 16-bit per channel types +[X] support color profile chunk types (but never let them touch RGB values by default) +[ ] support all public PNG chunk types (almost done except sPLT and hIST) +[ ] make sure encoder generates no chunks with size > (2^31)-1 +[ ] partial decoding (stream processing) +[X] let the "isFullyOpaque" function check color keys and transparent palettes too +[X] better name for the variables "codes", "codesD", "codelengthcodes", "clcl" and "lldl" +[ ] allow treating some errors like warnings, when image is recoverable (e.g. 69, 57, 58) +[ ] make warnings like: oob palette, checksum fail, data after iend, wrong/unknown crit chunk, no null terminator in text, ... +[ ] error messages with line numbers (and version) +[ ] errors in state instead of as return code? +[ ] new errors/warnings like suspiciously big decompressed ztxt or iccp chunk +[ ] let the C++ wrapper catch exceptions coming from the standard library and return LodePNG error codes +[ ] allow user to provide custom color conversion functions, e.g. for premultiplied alpha, padding bits or not, ... +[ ] allow user to give data (void*) to custom allocator +[X] provide alternatives for C library functions not present on some platforms (memcpy, ...) +*/ + +#endif /*LODEPNG_H inclusion guard*/ + +/* +LodePNG Documentation +--------------------- + +0. table of contents +-------------------- + + 1. about + 1.1. supported features + 1.2. features not supported + 2. C and C++ version + 3. security + 4. decoding + 5. encoding + 6. color conversions + 6.1. PNG color types + 6.2. color conversions + 6.3. padding bits + 6.4. A note about 16-bits per channel and endianness + 7. error values + 8. chunks and PNG editing + 9. compiler support + 10. examples + 10.1. decoder C++ example + 10.2. decoder C example + 11. state settings reference + 12. changes + 13. contact information + + +1. about +-------- + +PNG is a file format to store raster images losslessly with good compression, +supporting different color types and alpha channel. + +LodePNG is a PNG codec according to the Portable Network Graphics (PNG) +Specification (Second Edition) - W3C Recommendation 10 November 2003. + +The specifications used are: + +*) Portable Network Graphics (PNG) Specification (Second Edition): + http://www.w3.org/TR/2003/REC-PNG-20031110 +*) RFC 1950 ZLIB Compressed Data Format version 3.3: + http://www.gzip.org/zlib/rfc-zlib.html +*) RFC 1951 DEFLATE Compressed Data Format Specification ver 1.3: + http://www.gzip.org/zlib/rfc-deflate.html + +The most recent version of LodePNG can currently be found at +http://lodev.org/lodepng/ + +LodePNG works both in C (ISO C90) and C++, with a C++ wrapper that adds +extra functionality. + +LodePNG exists out of two files: +-lodepng.h: the header file for both C and C++ +-lodepng.c(pp): give it the name lodepng.c or lodepng.cpp (or .cc) depending on your usage + +If you want to start using LodePNG right away without reading this doc, get the +examples from the LodePNG website to see how to use it in code, or check the +smaller examples in chapter 13 here. + +LodePNG is simple but only supports the basic requirements. To achieve +simplicity, the following design choices were made: There are no dependencies +on any external library. There are functions to decode and encode a PNG with +a single function call, and extended versions of these functions taking a +LodePNGState struct allowing to specify or get more information. By default +the colors of the raw image are always RGB or RGBA, no matter what color type +the PNG file uses. To read and write files, there are simple functions to +convert the files to/from buffers in memory. + +This all makes LodePNG suitable for loading textures in games, demos and small +programs, ... It's less suitable for full fledged image editors, loading PNGs +over network (it requires all the image data to be available before decoding can +begin), life-critical systems, ... + +1.1. supported features +----------------------- + +The following features are supported by the decoder: + +*) decoding of PNGs with any color type, bit depth and interlace mode, to a 24- or 32-bit color raw image, + or the same color type as the PNG +*) encoding of PNGs, from any raw image to 24- or 32-bit color, or the same color type as the raw image +*) Adam7 interlace and deinterlace for any color type +*) loading the image from harddisk or decoding it from a buffer from other sources than harddisk +*) support for alpha channels, including RGBA color model, translucent palettes and color keying +*) zlib decompression (inflate) +*) zlib compression (deflate) +*) CRC32 and ADLER32 checksums +*) colorimetric color profile conversions: currently experimentally available in lodepng_util.cpp only, + plus alternatively ability to pass on chroma/gamma/ICC profile information to other color management system. +*) handling of unknown chunks, allowing making a PNG editor that stores custom and unknown chunks. +*) the following chunks are supported by both encoder and decoder: + IHDR: header information + PLTE: color palette + IDAT: pixel data + IEND: the final chunk + tRNS: transparency for palettized images + tEXt: textual information + zTXt: compressed textual information + iTXt: international textual information + bKGD: suggested background color + pHYs: physical dimensions + tIME: modification time + cHRM: RGB chromaticities + gAMA: RGB gamma correction + iCCP: ICC color profile + sRGB: rendering intent + sBIT: significant bits + +1.2. features not supported +--------------------------- + +The following features are not (yet) supported: + +*) some features needed to make a conformant PNG-Editor might be still missing. +*) partial loading/stream processing. All data must be available and is processed in one call. +*) The hIST and sPLT public chunks are not (yet) supported but treated as unknown chunks + + +2. C and C++ version +-------------------- + +The C version uses buffers allocated with alloc that you need to free() +yourself. You need to use init and cleanup functions for each struct whenever +using a struct from the C version to avoid exploits and memory leaks. + +The C++ version has extra functions with std::vectors in the interface and the +lodepng::State class which is a LodePNGState with constructor and destructor. + +These files work without modification for both C and C++ compilers because all +the additional C++ code is in "#ifdef __cplusplus" blocks that make C-compilers +ignore it, and the C code is made to compile both with strict ISO C90 and C++. + +To use the C++ version, you need to rename the source file to lodepng.cpp +(instead of lodepng.c), and compile it with a C++ compiler. + +To use the C version, you need to rename the source file to lodepng.c (instead +of lodepng.cpp), and compile it with a C compiler. + + +3. Security +----------- + +Even if carefully designed, it's always possible that LodePNG contains possible +exploits. If you discover one, please let me know, and it will be fixed. + +When using LodePNG, care has to be taken with the C version of LodePNG, as well +as the C-style structs when working with C++. The following conventions are used +for all C-style structs: + +-if a struct has a corresponding init function, always call the init function when making a new one +-if a struct has a corresponding cleanup function, call it before the struct disappears to avoid memory leaks +-if a struct has a corresponding copy function, use the copy function instead of "=". + The destination must also be inited already. + + +4. Decoding +----------- + +Decoding converts a PNG compressed image to a raw pixel buffer. + +Most documentation on using the decoder is at its declarations in the header +above. For C, simple decoding can be done with functions such as +lodepng_decode32, and more advanced decoding can be done with the struct +LodePNGState and lodepng_decode. For C++, all decoding can be done with the +various lodepng::decode functions, and lodepng::State can be used for advanced +features. + +When using the LodePNGState, it uses the following fields for decoding: +*) LodePNGInfo info_png: it stores extra information about the PNG (the input) in here +*) LodePNGColorMode info_raw: here you can say what color mode of the raw image (the output) you want to get +*) LodePNGDecoderSettings decoder: you can specify a few extra settings for the decoder to use + +LodePNGInfo info_png +-------------------- + +After decoding, this contains extra information of the PNG image, except the actual +pixels, width and height because these are already gotten directly from the decoder +functions. + +It contains for example the original color type of the PNG image, text comments, +suggested background color, etc... More details about the LodePNGInfo struct are +at its declaration documentation. + +LodePNGColorMode info_raw +------------------------- + +When decoding, here you can specify which color type you want +the resulting raw image to be. If this is different from the colortype of the +PNG, then the decoder will automatically convert the result. This conversion +always works, except if you want it to convert a color PNG to grayscale or to +a palette with missing colors. + +By default, 32-bit color is used for the result. + +LodePNGDecoderSettings decoder +------------------------------ + +The settings can be used to ignore the errors created by invalid CRC and Adler32 +chunks, and to disable the decoding of tEXt chunks. + +There's also a setting color_convert, true by default. If false, no conversion +is done, the resulting data will be as it was in the PNG (after decompression) +and you'll have to puzzle the colors of the pixels together yourself using the +color type information in the LodePNGInfo. + + +5. Encoding +----------- + +Encoding converts a raw pixel buffer to a PNG compressed image. + +Most documentation on using the encoder is at its declarations in the header +above. For C, simple encoding can be done with functions such as +lodepng_encode32, and more advanced decoding can be done with the struct +LodePNGState and lodepng_encode. For C++, all encoding can be done with the +various lodepng::encode functions, and lodepng::State can be used for advanced +features. + +Like the decoder, the encoder can also give errors. However it gives less errors +since the encoder input is trusted, the decoder input (a PNG image that could +be forged by anyone) is not trusted. + +When using the LodePNGState, it uses the following fields for encoding: +*) LodePNGInfo info_png: here you specify how you want the PNG (the output) to be. +*) LodePNGColorMode info_raw: here you say what color type of the raw image (the input) has +*) LodePNGEncoderSettings encoder: you can specify a few settings for the encoder to use + +LodePNGInfo info_png +-------------------- + +When encoding, you use this the opposite way as when decoding: for encoding, +you fill in the values you want the PNG to have before encoding. By default it's +not needed to specify a color type for the PNG since it's automatically chosen, +but it's possible to choose it yourself given the right settings. + +The encoder will not always exactly match the LodePNGInfo struct you give, +it tries as close as possible. Some things are ignored by the encoder. The +encoder uses, for example, the following settings from it when applicable: +colortype and bitdepth, text chunks, time chunk, the color key, the palette, the +background color, the interlace method, unknown chunks, ... + +When encoding to a PNG with colortype 3, the encoder will generate a PLTE chunk. +If the palette contains any colors for which the alpha channel is not 255 (so +there are translucent colors in the palette), it'll add a tRNS chunk. + +LodePNGColorMode info_raw +------------------------- + +You specify the color type of the raw image that you give to the input here, +including a possible transparent color key and palette you happen to be using in +your raw image data. + +By default, 32-bit color is assumed, meaning your input has to be in RGBA +format with 4 bytes (unsigned chars) per pixel. + +LodePNGEncoderSettings encoder +------------------------------ + +The following settings are supported (some are in sub-structs): +*) auto_convert: when this option is enabled, the encoder will +automatically choose the smallest possible color mode (including color key) that +can encode the colors of all pixels without information loss. +*) btype: the block type for LZ77. 0 = uncompressed, 1 = fixed huffman tree, + 2 = dynamic huffman tree (best compression). Should be 2 for proper + compression. +*) use_lz77: whether or not to use LZ77 for compressed block types. Should be + true for proper compression. +*) windowsize: the window size used by the LZ77 encoder (1 - 32768). Has value + 2048 by default, but can be set to 32768 for better, but slow, compression. +*) force_palette: if colortype is 2 or 6, you can make the encoder write a PLTE + chunk if force_palette is true. This can used as suggested palette to convert + to by viewers that don't support more than 256 colors (if those still exist) +*) add_id: add text chunk "Encoder: LodePNG " to the image. +*) text_compression: default 1. If 1, it'll store texts as zTXt instead of tEXt chunks. + zTXt chunks use zlib compression on the text. This gives a smaller result on + large texts but a larger result on small texts (such as a single program name). + It's all tEXt or all zTXt though, there's no separate setting per text yet. + + +6. color conversions +-------------------- + +An important thing to note about LodePNG, is that the color type of the PNG, and +the color type of the raw image, are completely independent. By default, when +you decode a PNG, you get the result as a raw image in the color type you want, +no matter whether the PNG was encoded with a palette, grayscale or RGBA color. +And if you encode an image, by default LodePNG will automatically choose the PNG +color type that gives good compression based on the values of colors and amount +of colors in the image. It can be configured to let you control it instead as +well, though. + +To be able to do this, LodePNG does conversions from one color mode to another. +It can convert from almost any color type to any other color type, except the +following conversions: RGB to grayscale is not supported, and converting to a +palette when the palette doesn't have a required color is not supported. This is +not supported on purpose: this is information loss which requires a color +reduction algorithm that is beyond the scope of a PNG encoder (yes, RGB to gray +is easy, but there are multiple ways if you want to give some channels more +weight). + +By default, when decoding, you get the raw image in 32-bit RGBA or 24-bit RGB +color, no matter what color type the PNG has. And by default when encoding, +LodePNG automatically picks the best color model for the output PNG, and expects +the input image to be 32-bit RGBA or 24-bit RGB. So, unless you want to control +the color format of the images yourself, you can skip this chapter. + +6.1. PNG color types +-------------------- + +A PNG image can have many color types, ranging from 1-bit color to 64-bit color, +as well as palettized color modes. After the zlib decompression and unfiltering +in the PNG image is done, the raw pixel data will have that color type and thus +a certain amount of bits per pixel. If you want the output raw image after +decoding to have another color type, a conversion is done by LodePNG. + +The PNG specification gives the following color types: + +0: grayscale, bit depths 1, 2, 4, 8, 16 +2: RGB, bit depths 8 and 16 +3: palette, bit depths 1, 2, 4 and 8 +4: grayscale with alpha, bit depths 8 and 16 +6: RGBA, bit depths 8 and 16 + +Bit depth is the amount of bits per pixel per color channel. So the total amount +of bits per pixel is: amount of channels * bitdepth. + +6.2. color conversions +---------------------- + +As explained in the sections about the encoder and decoder, you can specify +color types and bit depths in info_png and info_raw to change the default +behaviour. + +If, when decoding, you want the raw image to be something else than the default, +you need to set the color type and bit depth you want in the LodePNGColorMode, +or the parameters colortype and bitdepth of the simple decoding function. + +If, when encoding, you use another color type than the default in the raw input +image, you need to specify its color type and bit depth in the LodePNGColorMode +of the raw image, or use the parameters colortype and bitdepth of the simple +encoding function. + +If, when encoding, you don't want LodePNG to choose the output PNG color type +but control it yourself, you need to set auto_convert in the encoder settings +to false, and specify the color type you want in the LodePNGInfo of the +encoder (including palette: it can generate a palette if auto_convert is true, +otherwise not). + +If the input and output color type differ (whether user chosen or auto chosen), +LodePNG will do a color conversion, which follows the rules below, and may +sometimes result in an error. + +To avoid some confusion: +-the decoder converts from PNG to raw image +-the encoder converts from raw image to PNG +-the colortype and bitdepth in LodePNGColorMode info_raw, are those of the raw image +-the colortype and bitdepth in the color field of LodePNGInfo info_png, are those of the PNG +-when encoding, the color type in LodePNGInfo is ignored if auto_convert + is enabled, it is automatically generated instead +-when decoding, the color type in LodePNGInfo is set by the decoder to that of the original + PNG image, but it can be ignored since the raw image has the color type you requested instead +-if the color type of the LodePNGColorMode and PNG image aren't the same, a conversion + between the color types is done if the color types are supported. If it is not + supported, an error is returned. If the types are the same, no conversion is done. +-even though some conversions aren't supported, LodePNG supports loading PNGs from any + colortype and saving PNGs to any colortype, sometimes it just requires preparing + the raw image correctly before encoding. +-both encoder and decoder use the same color converter. + +The function lodepng_convert does the color conversion. It is available in the +interface but normally isn't needed since the encoder and decoder already call +it. + +Non supported color conversions: +-color to grayscale when non-gray pixels are present: no error is thrown, but +the result will look ugly because only the red channel is taken (it assumes all +three channels are the same in this case so ignores green and blue). The reason +no error is given is to allow converting from three-channel grayscale images to +one-channel even if there are numerical imprecisions. +-anything to palette when the palette does not have an exact match for a from-color +in it: in this case an error is thrown + +Supported color conversions: +-anything to 8-bit RGB, 8-bit RGBA, 16-bit RGB, 16-bit RGBA +-any gray or gray+alpha, to gray or gray+alpha +-anything to a palette, as long as the palette has the requested colors in it +-removing alpha channel +-higher to smaller bitdepth, and vice versa + +If you want no color conversion to be done (e.g. for speed or control): +-In the encoder, you can make it save a PNG with any color type by giving the +raw color mode and LodePNGInfo the same color mode, and setting auto_convert to +false. +-In the decoder, you can make it store the pixel data in the same color type +as the PNG has, by setting the color_convert setting to false. Settings in +info_raw are then ignored. + +6.3. padding bits +----------------- + +In the PNG file format, if a less than 8-bit per pixel color type is used and the scanlines +have a bit amount that isn't a multiple of 8, then padding bits are used so that each +scanline starts at a fresh byte. But that is NOT true for the LodePNG raw input and output. +The raw input image you give to the encoder, and the raw output image you get from the decoder +will NOT have these padding bits, e.g. in the case of a 1-bit image with a width +of 7 pixels, the first pixel of the second scanline will the 8th bit of the first byte, +not the first bit of a new byte. + +6.4. A note about 16-bits per channel and endianness +---------------------------------------------------- + +LodePNG uses unsigned char arrays for 16-bit per channel colors too, just like +for any other color format. The 16-bit values are stored in big endian (most +significant byte first) in these arrays. This is the opposite order of the +little endian used by x86 CPU's. + +LodePNG always uses big endian because the PNG file format does so internally. +Conversions to other formats than PNG uses internally are not supported by +LodePNG on purpose, there are myriads of formats, including endianness of 16-bit +colors, the order in which you store R, G, B and A, and so on. Supporting and +converting to/from all that is outside the scope of LodePNG. + +This may mean that, depending on your use case, you may want to convert the big +endian output of LodePNG to little endian with a for loop. This is certainly not +always needed, many applications and libraries support big endian 16-bit colors +anyway, but it means you cannot simply cast the unsigned char* buffer to an +unsigned short* buffer on x86 CPUs. + + +7. error values +--------------- + +All functions in LodePNG that return an error code, return 0 if everything went +OK, or a non-zero code if there was an error. + +The meaning of the LodePNG error values can be retrieved with the function +lodepng_error_text: given the numerical error code, it returns a description +of the error in English as a string. + +Check the implementation of lodepng_error_text to see the meaning of each code. + +It is not recommended to use the numerical values to programmatically make +different decisions based on error types as the numbers are not guaranteed to +stay backwards compatible. They are for human consumption only. Programmatically +only 0 or non-0 matter. + + +8. chunks and PNG editing +------------------------- + +If you want to add extra chunks to a PNG you encode, or use LodePNG for a PNG +editor that should follow the rules about handling of unknown chunks, or if your +program is able to read other types of chunks than the ones handled by LodePNG, +then that's possible with the chunk functions of LodePNG. + +A PNG chunk has the following layout: + +4 bytes length +4 bytes type name +length bytes data +4 bytes CRC + +8.1. iterating through chunks +----------------------------- + +If you have a buffer containing the PNG image data, then the first chunk (the +IHDR chunk) starts at byte number 8 of that buffer. The first 8 bytes are the +signature of the PNG and are not part of a chunk. But if you start at byte 8 +then you have a chunk, and can check the following things of it. + +NOTE: none of these functions check for memory buffer boundaries. To avoid +exploits, always make sure the buffer contains all the data of the chunks. +When using lodepng_chunk_next, make sure the returned value is within the +allocated memory. + +unsigned lodepng_chunk_length(const unsigned char* chunk): + +Get the length of the chunk's data. The total chunk length is this length + 12. + +void lodepng_chunk_type(char type[5], const unsigned char* chunk): +unsigned char lodepng_chunk_type_equals(const unsigned char* chunk, const char* type): + +Get the type of the chunk or compare if it's a certain type + +unsigned char lodepng_chunk_critical(const unsigned char* chunk): +unsigned char lodepng_chunk_private(const unsigned char* chunk): +unsigned char lodepng_chunk_safetocopy(const unsigned char* chunk): + +Check if the chunk is critical in the PNG standard (only IHDR, PLTE, IDAT and IEND are). +Check if the chunk is private (public chunks are part of the standard, private ones not). +Check if the chunk is safe to copy. If it's not, then, when modifying data in a critical +chunk, unsafe to copy chunks of the old image may NOT be saved in the new one if your +program doesn't handle that type of unknown chunk. + +unsigned char* lodepng_chunk_data(unsigned char* chunk): +const unsigned char* lodepng_chunk_data_const(const unsigned char* chunk): + +Get a pointer to the start of the data of the chunk. + +unsigned lodepng_chunk_check_crc(const unsigned char* chunk): +void lodepng_chunk_generate_crc(unsigned char* chunk): + +Check if the crc is correct or generate a correct one. + +unsigned char* lodepng_chunk_next(unsigned char* chunk): +const unsigned char* lodepng_chunk_next_const(const unsigned char* chunk): + +Iterate to the next chunk. This works if you have a buffer with consecutive chunks. Note that these +functions do no boundary checking of the allocated data whatsoever, so make sure there is enough +data available in the buffer to be able to go to the next chunk. + +unsigned lodepng_chunk_append(unsigned char** out, size_t* outsize, const unsigned char* chunk): +unsigned lodepng_chunk_create(unsigned char** out, size_t* outsize, unsigned length, + const char* type, const unsigned char* data): + +These functions are used to create new chunks that are appended to the data in *out that has +length *outsize. The append function appends an existing chunk to the new data. The create +function creates a new chunk with the given parameters and appends it. Type is the 4-letter +name of the chunk. + +8.2. chunks in info_png +----------------------- + +The LodePNGInfo struct contains fields with the unknown chunk in it. It has 3 +buffers (each with size) to contain 3 types of unknown chunks: +the ones that come before the PLTE chunk, the ones that come between the PLTE +and the IDAT chunks, and the ones that come after the IDAT chunks. +It's necessary to make the distinction between these 3 cases because the PNG +standard forces to keep the ordering of unknown chunks compared to the critical +chunks, but does not force any other ordering rules. + +info_png.unknown_chunks_data[0] is the chunks before PLTE +info_png.unknown_chunks_data[1] is the chunks after PLTE, before IDAT +info_png.unknown_chunks_data[2] is the chunks after IDAT + +The chunks in these 3 buffers can be iterated through and read by using the same +way described in the previous subchapter. + +When using the decoder to decode a PNG, you can make it store all unknown chunks +if you set the option settings.remember_unknown_chunks to 1. By default, this +option is off (0). + +The encoder will always encode unknown chunks that are stored in the info_png. +If you need it to add a particular chunk that isn't known by LodePNG, you can +use lodepng_chunk_append or lodepng_chunk_create to the chunk data in +info_png.unknown_chunks_data[x]. + +Chunks that are known by LodePNG should not be added in that way. E.g. to make +LodePNG add a bKGD chunk, set background_defined to true and add the correct +parameters there instead. + + +9. compiler support +------------------- + +No libraries other than the current standard C library are needed to compile +LodePNG. For the C++ version, only the standard C++ library is needed on top. +Add the files lodepng.c(pp) and lodepng.h to your project, include +lodepng.h where needed, and your program can read/write PNG files. + +It is compatible with C90 and up, and C++03 and up. + +If performance is important, use optimization when compiling! For both the +encoder and decoder, this makes a large difference. + +Make sure that LodePNG is compiled with the same compiler of the same version +and with the same settings as the rest of the program, or the interfaces with +std::vectors and std::strings in C++ can be incompatible. + +CHAR_BITS must be 8 or higher, because LodePNG uses unsigned chars for octets. + +*) gcc and g++ + +LodePNG is developed in gcc so this compiler is natively supported. It gives no +warnings with compiler options "-Wall -Wextra -pedantic -ansi", with gcc and g++ +version 4.7.1 on Linux, 32-bit and 64-bit. + +*) Clang + +Fully supported and warning-free. + +*) Mingw + +The Mingw compiler (a port of gcc for Windows) should be fully supported by +LodePNG. + +*) Visual Studio and Visual C++ Express Edition + +LodePNG should be warning-free with warning level W4. Two warnings were disabled +with pragmas though: warning 4244 about implicit conversions, and warning 4996 +where it wants to use a non-standard function fopen_s instead of the standard C +fopen. + +Visual Studio may want "stdafx.h" files to be included in each source file and +give an error "unexpected end of file while looking for precompiled header". +This is not standard C++ and will not be added to the stock LodePNG. You can +disable it for lodepng.cpp only by right clicking it, Properties, C/C++, +Precompiled Headers, and set it to Not Using Precompiled Headers there. + +NOTE: Modern versions of VS should be fully supported, but old versions, e.g. +VS6, are not guaranteed to work. + +*) Compilers on Macintosh + +LodePNG has been reported to work both with gcc and LLVM for Macintosh, both for +C and C++. + +*) Other Compilers + +If you encounter problems on any compilers, feel free to let me know and I may +try to fix it if the compiler is modern and standards compliant. + + +10. examples +------------ + +This decoder example shows the most basic usage of LodePNG. More complex +examples can be found on the LodePNG website. + +NOTE: these examples do not support wide-character filenames, you can use an +external method to handle such files and encode or decode in-memory + +10.1. decoder C++ example +------------------------- + +#include "lodepng.h" +#include + +int main(int argc, char *argv[]) { + const char* filename = argc > 1 ? argv[1] : "test.png"; + + //load and decode + std::vector image; + unsigned width, height; + unsigned error = lodepng::decode(image, width, height, filename); + + //if there's an error, display it + if(error) std::cout << "decoder error " << error << ": " << lodepng_error_text(error) << std::endl; + + //the pixels are now in the vector "image", 4 bytes per pixel, ordered RGBARGBA..., use it as texture, draw it, ... +} + +10.2. decoder C example +----------------------- + +#include "lodepng.h" + +int main(int argc, char *argv[]) { + unsigned error; + unsigned char* image; + size_t width, height; + const char* filename = argc > 1 ? argv[1] : "test.png"; + + error = lodepng_decode32_file(&image, &width, &height, filename); + + if(error) printf("decoder error %u: %s\n", error, lodepng_error_text(error)); + + / * use image here * / + + free(image); + return 0; +} + +11. state settings reference +---------------------------- + +A quick reference of some settings to set on the LodePNGState + +For decoding: + +state.decoder.zlibsettings.ignore_adler32: ignore ADLER32 checksums +state.decoder.zlibsettings.custom_...: use custom inflate function +state.decoder.ignore_crc: ignore CRC checksums +state.decoder.ignore_critical: ignore unknown critical chunks +state.decoder.ignore_end: ignore missing IEND chunk. May fail if this corruption causes other errors +state.decoder.color_convert: convert internal PNG color to chosen one +state.decoder.read_text_chunks: whether to read in text metadata chunks +state.decoder.remember_unknown_chunks: whether to read in unknown chunks +state.info_raw.colortype: desired color type for decoded image +state.info_raw.bitdepth: desired bit depth for decoded image +state.info_raw....: more color settings, see struct LodePNGColorMode +state.info_png....: no settings for decoder but ouput, see struct LodePNGInfo + +For encoding: + +state.encoder.zlibsettings.btype: disable compression by setting it to 0 +state.encoder.zlibsettings.use_lz77: use LZ77 in compression +state.encoder.zlibsettings.windowsize: tweak LZ77 windowsize +state.encoder.zlibsettings.minmatch: tweak min LZ77 length to match +state.encoder.zlibsettings.nicematch: tweak LZ77 match where to stop searching +state.encoder.zlibsettings.lazymatching: try one more LZ77 matching +state.encoder.zlibsettings.custom_...: use custom deflate function +state.encoder.auto_convert: choose optimal PNG color type, if 0 uses info_png +state.encoder.filter_palette_zero: PNG filter strategy for palette +state.encoder.filter_strategy: PNG filter strategy to encode with +state.encoder.force_palette: add palette even if not encoding to one +state.encoder.add_id: add LodePNG identifier and version as a text chunk +state.encoder.text_compression: use compressed text chunks for metadata +state.info_raw.colortype: color type of raw input image you provide +state.info_raw.bitdepth: bit depth of raw input image you provide +state.info_raw: more color settings, see struct LodePNGColorMode +state.info_png.color.colortype: desired color type if auto_convert is false +state.info_png.color.bitdepth: desired bit depth if auto_convert is false +state.info_png.color....: more color settings, see struct LodePNGColorMode +state.info_png....: more PNG related settings, see struct LodePNGInfo + + +12. changes +----------- + +The version number of LodePNG is the date of the change given in the format +yyyymmdd. + +Some changes aren't backwards compatible. Those are indicated with a (!) +symbol. + +Not all changes are listed here, the commit history in github lists more: +https://github.com/lvandeve/lodepng + +*) 13 jun 2022: added support for the sBIT chunk. +*) 09 jan 2022: minor decoder speed improvements. +*) 27 jun 2021: added warnings that file reading/writing functions don't support + wide-character filenames (support for this is not planned, opening files is + not the core part of PNG decoding/decoding and is platform dependent). +*) 17 okt 2020: prevent decoding too large text/icc chunks by default. +*) 06 mar 2020: simplified some of the dynamic memory allocations. +*) 12 jan 2020: (!) added 'end' argument to lodepng_chunk_next to allow correct + overflow checks. +*) 14 aug 2019: around 25% faster decoding thanks to huffman lookup tables. +*) 15 jun 2019: (!) auto_choose_color API changed (for bugfix: don't use palette + if gray ICC profile) and non-ICC LodePNGColorProfile renamed to + LodePNGColorStats. +*) 30 dec 2018: code style changes only: removed newlines before opening braces. +*) 10 sep 2018: added way to inspect metadata chunks without full decoding. +*) 19 aug 2018: (!) fixed color mode bKGD is encoded with and made it use + palette index in case of palette. +*) 10 aug 2018: (!) added support for gAMA, cHRM, sRGB and iCCP chunks. This + change is backwards compatible unless you relied on unknown_chunks for those. +*) 11 jun 2018: less restrictive check for pixel size integer overflow +*) 14 jan 2018: allow optionally ignoring a few more recoverable errors +*) 17 sep 2017: fix memory leak for some encoder input error cases +*) 27 nov 2016: grey+alpha auto color model detection bugfix +*) 18 apr 2016: Changed qsort to custom stable sort (for platforms w/o qsort). +*) 09 apr 2016: Fixed colorkey usage detection, and better file loading (within + the limits of pure C90). +*) 08 dec 2015: Made load_file function return error if file can't be opened. +*) 24 okt 2015: Bugfix with decoding to palette output. +*) 18 apr 2015: Boundary PM instead of just package-merge for faster encoding. +*) 24 aug 2014: Moved to github +*) 23 aug 2014: Reduced needless memory usage of decoder. +*) 28 jun 2014: Removed fix_png setting, always support palette OOB for + simplicity. Made ColorProfile public. +*) 09 jun 2014: Faster encoder by fixing hash bug and more zeros optimization. +*) 22 dec 2013: Power of two windowsize required for optimization. +*) 15 apr 2013: Fixed bug with LAC_ALPHA and color key. +*) 25 mar 2013: Added an optional feature to ignore some PNG errors (fix_png). +*) 11 mar 2013: (!) Bugfix with custom free. Changed from "my" to "lodepng_" + prefix for the custom allocators and made it possible with a new #define to + use custom ones in your project without needing to change lodepng's code. +*) 28 jan 2013: Bugfix with color key. +*) 27 okt 2012: Tweaks in text chunk keyword length error handling. +*) 8 okt 2012: (!) Added new filter strategy (entropy) and new auto color mode. + (no palette). Better deflate tree encoding. New compression tweak settings. + Faster color conversions while decoding. Some internal cleanups. +*) 23 sep 2012: Reduced warnings in Visual Studio a little bit. +*) 1 sep 2012: (!) Removed #define's for giving custom (de)compression functions + and made it work with function pointers instead. +*) 23 jun 2012: Added more filter strategies. Made it easier to use custom alloc + and free functions and toggle #defines from compiler flags. Small fixes. +*) 6 may 2012: (!) Made plugging in custom zlib/deflate functions more flexible. +*) 22 apr 2012: (!) Made interface more consistent, renaming a lot. Removed + redundant C++ codec classes. Reduced amount of structs. Everything changed, + but it is cleaner now imho and functionality remains the same. Also fixed + several bugs and shrunk the implementation code. Made new samples. +*) 6 nov 2011: (!) By default, the encoder now automatically chooses the best + PNG color model and bit depth, based on the amount and type of colors of the + raw image. For this, autoLeaveOutAlphaChannel replaced by auto_choose_color. +*) 9 okt 2011: simpler hash chain implementation for the encoder. +*) 8 sep 2011: lz77 encoder lazy matching instead of greedy matching. +*) 23 aug 2011: tweaked the zlib compression parameters after benchmarking. + A bug with the PNG filtertype heuristic was fixed, so that it chooses much + better ones (it's quite significant). A setting to do an experimental, slow, + brute force search for PNG filter types is added. +*) 17 aug 2011: (!) changed some C zlib related function names. +*) 16 aug 2011: made the code less wide (max 120 characters per line). +*) 17 apr 2011: code cleanup. Bugfixes. Convert low to 16-bit per sample colors. +*) 21 feb 2011: fixed compiling for C90. Fixed compiling with sections disabled. +*) 11 dec 2010: encoding is made faster, based on suggestion by Peter Eastman + to optimize long sequences of zeros. +*) 13 nov 2010: added LodePNG_InfoColor_hasPaletteAlpha and + LodePNG_InfoColor_canHaveAlpha functions for convenience. +*) 7 nov 2010: added LodePNG_error_text function to get error code description. +*) 30 okt 2010: made decoding slightly faster +*) 26 okt 2010: (!) changed some C function and struct names (more consistent). + Reorganized the documentation and the declaration order in the header. +*) 08 aug 2010: only changed some comments and external samples. +*) 05 jul 2010: fixed bug thanks to warnings in the new gcc version. +*) 14 mar 2010: fixed bug where too much memory was allocated for char buffers. +*) 02 sep 2008: fixed bug where it could create empty tree that linux apps could + read by ignoring the problem but windows apps couldn't. +*) 06 jun 2008: added more error checks for out of memory cases. +*) 26 apr 2008: added a few more checks here and there to ensure more safety. +*) 06 mar 2008: crash with encoding of strings fixed +*) 02 feb 2008: support for international text chunks added (iTXt) +*) 23 jan 2008: small cleanups, and #defines to divide code in sections +*) 20 jan 2008: support for unknown chunks allowing using LodePNG for an editor. +*) 18 jan 2008: support for tIME and pHYs chunks added to encoder and decoder. +*) 17 jan 2008: ability to encode and decode compressed zTXt chunks added + Also various fixes, such as in the deflate and the padding bits code. +*) 13 jan 2008: Added ability to encode Adam7-interlaced images. Improved + filtering code of encoder. +*) 07 jan 2008: (!) changed LodePNG to use ISO C90 instead of C++. A + C++ wrapper around this provides an interface almost identical to before. + Having LodePNG be pure ISO C90 makes it more portable. The C and C++ code + are together in these files but it works both for C and C++ compilers. +*) 29 dec 2007: (!) changed most integer types to unsigned int + other tweaks +*) 30 aug 2007: bug fixed which makes this Borland C++ compatible +*) 09 aug 2007: some VS2005 warnings removed again +*) 21 jul 2007: deflate code placed in new namespace separate from zlib code +*) 08 jun 2007: fixed bug with 2- and 4-bit color, and small interlaced images +*) 04 jun 2007: improved support for Visual Studio 2005: crash with accessing + invalid std::vector element [0] fixed, and level 3 and 4 warnings removed +*) 02 jun 2007: made the encoder add a tag with version by default +*) 27 may 2007: zlib and png code separated (but still in the same file), + simple encoder/decoder functions added for more simple usage cases +*) 19 may 2007: minor fixes, some code cleaning, new error added (error 69), + moved some examples from here to lodepng_examples.cpp +*) 12 may 2007: palette decoding bug fixed +*) 24 apr 2007: changed the license from BSD to the zlib license +*) 11 mar 2007: very simple addition: ability to encode bKGD chunks. +*) 04 mar 2007: (!) tEXt chunk related fixes, and support for encoding + palettized PNG images. Plus little interface change with palette and texts. +*) 03 mar 2007: Made it encode dynamic Huffman shorter with repeat codes. + Fixed a bug where the end code of a block had length 0 in the Huffman tree. +*) 26 feb 2007: Huffman compression with dynamic trees (BTYPE 2) now implemented + and supported by the encoder, resulting in smaller PNGs at the output. +*) 27 jan 2007: Made the Adler-32 test faster so that a timewaste is gone. +*) 24 jan 2007: gave encoder an error interface. Added color conversion from any + greyscale type to 8-bit greyscale with or without alpha. +*) 21 jan 2007: (!) Totally changed the interface. It allows more color types + to convert to and is more uniform. See the manual for how it works now. +*) 07 jan 2007: Some cleanup & fixes, and a few changes over the last days: + encode/decode custom tEXt chunks, separate classes for zlib & deflate, and + at last made the decoder give errors for incorrect Adler32 or Crc. +*) 01 jan 2007: Fixed bug with encoding PNGs with less than 8 bits per channel. +*) 29 dec 2006: Added support for encoding images without alpha channel, and + cleaned out code as well as making certain parts faster. +*) 28 dec 2006: Added "Settings" to the encoder. +*) 26 dec 2006: The encoder now does LZ77 encoding and produces much smaller files now. + Removed some code duplication in the decoder. Fixed little bug in an example. +*) 09 dec 2006: (!) Placed output parameters of public functions as first parameter. + Fixed a bug of the decoder with 16-bit per color. +*) 15 okt 2006: Changed documentation structure +*) 09 okt 2006: Encoder class added. It encodes a valid PNG image from the + given image buffer, however for now it's not compressed. +*) 08 sep 2006: (!) Changed to interface with a Decoder class +*) 30 jul 2006: (!) LodePNG_InfoPng , width and height are now retrieved in different + way. Renamed decodePNG to decodePNGGeneric. +*) 29 jul 2006: (!) Changed the interface: image info is now returned as a + struct of type LodePNG::LodePNG_Info, instead of a vector, which was a bit clumsy. +*) 28 jul 2006: Cleaned the code and added new error checks. + Corrected terminology "deflate" into "inflate". +*) 23 jun 2006: Added SDL example in the documentation in the header, this + example allows easy debugging by displaying the PNG and its transparency. +*) 22 jun 2006: (!) Changed way to obtain error value. Added + loadFile function for convenience. Made decodePNG32 faster. +*) 21 jun 2006: (!) Changed type of info vector to unsigned. + Changed position of palette in info vector. Fixed an important bug that + happened on PNGs with an uncompressed block. +*) 16 jun 2006: Internally changed unsigned into unsigned where + needed, and performed some optimizations. +*) 07 jun 2006: (!) Renamed functions to decodePNG and placed them + in LodePNG namespace. Changed the order of the parameters. Rewrote the + documentation in the header. Renamed files to lodepng.cpp and lodepng.h +*) 22 apr 2006: Optimized and improved some code +*) 07 sep 2005: (!) Changed to std::vector interface +*) 12 aug 2005: Initial release (C++, decoder only) + + +13. contact information +----------------------- + +Feel free to contact me with suggestions, problems, comments, ... concerning +LodePNG. If you encounter a PNG image that doesn't work properly with this +decoder, feel free to send it and I'll use it to find and fix the problem. + +My email address is (puzzle the account and domain together with an @ symbol): +Domain: gmail dot com. +Account: lode dot vandevenne. + + +Copyright (c) 2005-2022 Lode Vandevenne +*/ diff --git a/libs/litehtml/containers/test/test_container.cpp b/libs/litehtml/containers/test/test_container.cpp new file mode 100644 index 0000000000..9522b577e3 --- /dev/null +++ b/libs/litehtml/containers/test/test_container.cpp @@ -0,0 +1,94 @@ +#include "test_container.h" +#include "Font.h" +string readfile(string filename); + +// note: font is selected only by size, name and style are not used +uint_ptr test_container::create_font(const char* /*faceName*/, int size, int /*weight*/, font_style /*italic*/, unsigned int /*decoration*/, font_metrics* fm) +{ + Font* font = new Font(size); + + if (fm) + { + fm->ascent = font->ascent; + fm->descent = font->descent; + fm->height = font->height; + fm->x_height = font->x_height; + } + return (uint_ptr)font; +} + +int test_container::text_width(const char* text, uint_ptr hFont) +{ + Font* font = (Font*)hFont; + return (int)strlen(text) * font->width; +} + +void test_container::draw_text(uint_ptr hdc, const char* text, uint_ptr hFont, web_color color, const position& pos) +{ + auto bmp = (Bitmap*)hdc; + Font* font = (Font*)hFont; + + int x = pos.x; + for (auto p = text; *p; p++) + { + Bitmap glyph = font->get_glyph(*p, color); + bmp->draw_bitmap(x, pos.y, glyph); + x += glyph.width; + } +} + +int test_container::pt_to_px(int pt) const { return pt * 96 / 72; } +int test_container::get_default_font_size() const { return 16; } +const char* test_container::get_default_font_name() const { return ""; } + +void test_container::draw_background(uint_ptr hdc, const std::vector& bg) +{ + auto bmp = (Bitmap*)hdc; + bmp->fill_rect(bg.back().border_box, bg.back().color); +} + +void test_container::draw_borders(uint_ptr hdc, const borders& borders, const position& pos, bool /*root*/) +{ + auto bmp = (Bitmap*)hdc; + + // left border + for (int x = 0; x < borders.left.width; x++) + bmp->draw_line( + pos.left() + x, pos.top(), + pos.left() + x, pos.bottom(), borders.left.color); + + // right border + for (int x = 0; x < borders.right.width; x++) + bmp->draw_line( + pos.right() - x - 1, pos.top(), + pos.right() - x - 1, pos.bottom(), borders.right.color); + + // top border + for (int y = 0; y < borders.top.width; y++) + bmp->draw_line( + pos.left(), pos.top() + y, + pos.right(), pos.top() + y, borders.top.color); + + // bottom border + for (int y = 0; y < borders.bottom.width; y++) + bmp->draw_line( + pos.left(), pos.bottom() - y - 1, + pos.right(), pos.bottom() - y - 1, borders.bottom.color); +} + +void test_container::draw_list_marker(uint_ptr hdc, const list_marker& marker) +{ + auto bmp = (Bitmap*)hdc; + bmp->fill_rect(marker.pos, marker.color); +} + +void test_container::import_css(string& text, const string& url, string& baseurl) +{ + baseurl = basedir + "/" + url; + text = readfile(baseurl); +} + +void test_container::get_client_rect(position& client) const +{ + client = position(0, 0, width, height); +} diff --git a/libs/litehtml/containers/test/test_container.h b/libs/litehtml/containers/test/test_container.h new file mode 100644 index 0000000000..390ad45492 --- /dev/null +++ b/libs/litehtml/containers/test/test_container.h @@ -0,0 +1,42 @@ +#include +using namespace litehtml; + +class test_container : public document_container +{ +public: + int width; + int height; + string basedir; + + test_container(int width, int height, string basedir) : width(width), height(height), basedir(basedir) {} + + uint_ptr create_font(const char* faceName, int size, int weight, font_style italic, unsigned int decoration, font_metrics* fm) override; + void delete_font(uint_ptr /*hFont*/) override {} + int text_width(const char* text, uint_ptr hFont) override; + void draw_text(uint_ptr hdc, const char* text, uint_ptr hFont, web_color color, const position& pos) override; + int pt_to_px(int pt) const override; + int get_default_font_size() const override; + const char* get_default_font_name() const override; + void load_image(const char* /*src*/, const char* /*baseurl*/, bool /*redraw_on_ready*/) override {} + void get_image_size(const char* /*src*/, const char* /*baseurl*/, size& /*sz*/) override {} + void draw_background(uint_ptr hdc, const std::vector& bg) override; + void draw_borders(uint_ptr hdc, const borders& borders, const position& draw_pos, bool root) override; + void draw_list_marker(uint_ptr hdc, const list_marker& marker) override; + element::ptr create_element(const char* /*tag_name*/, + const string_map& /*attributes*/, + const document::ptr& /*doc*/) override { return nullptr; } + void get_media_features(media_features& /*media*/) const override {} + void get_language(string& /*language*/, string& /*culture*/) const override {} + void link(const document::ptr& /*doc*/, const element::ptr& /*el*/) override {} + + void transform_text(string& /*text*/, text_transform /*tt*/) override {} + void set_clip(const position& /*pos*/, const border_radiuses& /*bdr_radius*/) override {} + void del_clip() override {} + + void set_caption(const char* /*caption*/) override {} + void set_base_url(const char* /*base_url*/) override {} + void on_anchor_click(const char* /*url*/, const element::ptr& /*el*/) override {} + void set_cursor(const char* /*cursor*/) override {} + void import_css(string& text, const string& url, string& baseurl) override; + void get_client_rect(position& client) const override; +}; \ No newline at end of file diff --git a/libs/litehtml/containers/windows/cairo/cairo_font.cpp b/libs/litehtml/containers/windows/cairo/cairo_font.cpp new file mode 100644 index 0000000000..76dcaa5ee8 --- /dev/null +++ b/libs/litehtml/containers/windows/cairo/cairo_font.cpp @@ -0,0 +1,374 @@ +#include "cairo_font.h" + +cairo_font::cairo_font(IMLangFontLink2* fl, HFONT hFont, int size ) +{ + init(); + m_font_link = fl; + if(m_font_link) + { + m_font_link->AddRef(); + } + m_size = size; + set_font(hFont); +} + +cairo_font::cairo_font(IMLangFontLink2* fl, LPCWSTR facename, int size, int weight, BOOL italic, BOOL strikeout, BOOL underline ) +{ + init(); + m_size = size; + m_font_link = fl; + if(m_font_link) + { + m_font_link->AddRef(); + } + + LOGFONT lf; + ZeroMemory(&lf, sizeof(lf)); + if(!lstrcmpi(facename, L"monospace")) + { + wcscpy_s(lf.lfFaceName, LF_FACESIZE, L"Courier New"); + } else if(!lstrcmpi(facename, L"serif")) + { + wcscpy_s(lf.lfFaceName, LF_FACESIZE, L"Times New Roman"); + } else if(!lstrcmpi(facename, L"sans-serif")) + { + wcscpy_s(lf.lfFaceName, LF_FACESIZE, L"Arial"); + } else if(!lstrcmpi(facename, L"fantasy")) + { + wcscpy_s(lf.lfFaceName, LF_FACESIZE, L"Impact"); + } else if(!lstrcmpi(facename, L"cursive")) + { + wcscpy_s(lf.lfFaceName, LF_FACESIZE, L"Comic Sans MS"); + } else + { + wcscpy_s(lf.lfFaceName, LF_FACESIZE, facename); + } + + lf.lfHeight = -size; + lf.lfWeight = weight; + lf.lfItalic = italic; + lf.lfCharSet = DEFAULT_CHARSET; + lf.lfOutPrecision = OUT_DEFAULT_PRECIS; + lf.lfClipPrecision = CLIP_DEFAULT_PRECIS; + lf.lfQuality = DEFAULT_QUALITY; + lf.lfStrikeOut = strikeout; + lf.lfUnderline = underline; + + HFONT fnt = CreateFontIndirect(&lf); + set_font(fnt); +} + +cairo_font::~cairo_font() +{ + if(m_font_face) + { + cairo_font_face_destroy(m_font_face); + } + for(size_t i = 0; i < m_linked_fonts.size(); i++) + { + if(m_linked_fonts[i]->hFont) + { + m_font_link->ReleaseFont(m_linked_fonts[i]->hFont); + } + if(m_linked_fonts[i]->font_face) + { + cairo_font_face_destroy(m_linked_fonts[i]->font_face); + } + } + m_linked_fonts.clear(); + if(m_font_link) + { + m_font_link->AddRef(); + } + if(m_hFont) + { + DeleteObject(m_hFont); + } +} + +void cairo_font::show_text( cairo_t* cr, int x, int y, const char* str ) +{ + lock(); + text_chunk::vector chunks; + split_text(str, chunks); + cairo_set_font_size(cr, m_size); + cairo_move_to(cr, x, y); + for(size_t i = 0; i < chunks.size(); i++) + { + if(chunks[i]->font) + { + cairo_set_font_face(cr, chunks[i]->font->font_face); + } else + { + cairo_set_font_face(cr, m_font_face); + } + cairo_show_text(cr, chunks[i]->text); + } + unlock(); + + if(m_bUnderline) + { + int tw = text_width(cr, chunks); + + lock(); + cairo_set_line_width(cr, 1); + cairo_move_to(cr, x, y + 1.5); + cairo_line_to(cr, x + tw, y + 1.5); + cairo_stroke(cr); + unlock(); + } + if(m_bStrikeOut) + { + int tw = text_width(cr, chunks); + + cairo_font_metrics fm; + get_metrics(cr, &fm); + + int ln_y = y - fm.x_height / 2; + + lock(); + cairo_set_line_width(cr, 1); + cairo_move_to(cr, x, (double) ln_y - 0.5); + cairo_line_to(cr, x + tw, (double) ln_y - 0.5); + cairo_stroke(cr); + unlock(); + } + + free_text_chunks(chunks); +} + +void cairo_font::split_text( const char* src, text_chunk::vector& chunks ) +{ + auto str = cairo_font::utf8_to_wchar(src); + const wchar_t* str_start = str.c_str(); + + int cch = str.length(); + + HDC hdc = GetDC(NULL); + SelectObject(hdc, m_hFont); + HRESULT hr = S_OK; + while(cch > 0) + { + DWORD dwActualCodePages; + long cchActual; + if(m_font_link) + { + hr = m_font_link->GetStrCodePages(str.c_str(), cch, m_font_code_pages, &dwActualCodePages, &cchActual); + } else + { + hr = S_FALSE; + } + + if(hr != S_OK) + { + break; + } + + text_chunk* chk = new text_chunk; + + int sz = WideCharToMultiByte(CP_UTF8, 0, str.c_str(), cchActual, chk->text, 0, NULL, NULL) + 1; + chk->text = new CHAR[sz]; + sz = WideCharToMultiByte(CP_UTF8, 0, str.c_str(), cchActual, chk->text, sz, NULL, NULL); + chk->text[sz] = 0; + chk->font = NULL; + + if(!(dwActualCodePages & m_font_code_pages)) + { + for(linked_font::vector::iterator i = m_linked_fonts.begin(); i != m_linked_fonts.end(); i++) + { + if((*i)->code_pages == dwActualCodePages) + { + chk->font = (*i); + break; + } + } + if(!chk->font) + { + linked_font* lkf = new linked_font; + lkf->code_pages = dwActualCodePages; + lkf->hFont = NULL; + m_font_link->MapFont(hdc, dwActualCodePages, 0, &lkf->hFont); + if (lkf->hFont) + { + lkf->font_face = create_font_face(lkf->hFont); + m_linked_fonts.push_back(lkf); + } + else + { + delete lkf; + lkf = NULL; + } + chk->font = lkf; + } + } + + chunks.push_back(chk); + + cch -= cchActual; + str += cchActual; + } + + if(hr != S_OK) + { + text_chunk* chk = new text_chunk; + + int sz = WideCharToMultiByte(CP_UTF8, 0, str.c_str(), -1, chk->text, 0, NULL, NULL) + 1; + chk->text = new CHAR[sz]; + sz = WideCharToMultiByte(CP_UTF8, 0, str.c_str(), -1, chk->text, sz, NULL, NULL); + chk->text[sz] = 0; + chk->font = NULL; + chunks.push_back(chk); + } + + ReleaseDC(NULL, hdc); +} + +void cairo_font::free_text_chunks( text_chunk::vector& chunks ) +{ + for(size_t i = 0; i < chunks.size(); i++) + { + delete chunks[i]; + } + chunks.clear(); +} + +cairo_font_face_t* cairo_font::create_font_face( HFONT fnt ) +{ + LOGFONT lf; + GetObject(fnt, sizeof(LOGFONT), &lf); + return cairo_win32_font_face_create_for_logfontw(&lf); +} + +int cairo_font::text_width( cairo_t* cr, const char* str ) +{ + text_chunk::vector chunks; + split_text(str, chunks); + + int ret = text_width(cr, chunks); + + free_text_chunks(chunks); + + return (int) ret; +} + +int cairo_font::text_width( cairo_t* cr, text_chunk::vector& chunks ) +{ + lock(); + cairo_set_font_size(cr, m_size); + double ret = 0; + for(size_t i = 0; i < chunks.size(); i++) + { + if(chunks[i]->font) + { + cairo_set_font_face(cr, chunks[i]->font->font_face); + } else + { + cairo_set_font_face(cr, m_font_face); + } + cairo_text_extents_t ext; + cairo_text_extents(cr, chunks[i]->text, &ext); + ret += ext.x_advance; + } + unlock(); + + return (int) ret; +} + +void cairo_font::get_metrics(cairo_t* cr, cairo_font_metrics* fm ) +{ + lock(); + cairo_set_font_face(cr, m_font_face); + cairo_set_font_size(cr, m_size); + cairo_font_extents_t ext; + cairo_font_extents(cr, &ext); + + cairo_text_extents_t tex; + cairo_text_extents(cr, "x", &tex); + + fm->ascent = (int) ext.ascent; + fm->descent = (int) ext.descent; + fm->height = (int) (ext.ascent + ext.descent); + fm->x_height = (int) tex.height; + unlock(); +} + +void cairo_font::set_font( HFONT hFont ) +{ + clear(); + + m_hFont = hFont; + m_font_face = create_font_face(m_hFont); + m_font_code_pages = 0; + if(m_font_link) + { + HDC hdc = GetDC(NULL); + SelectObject(hdc, m_hFont); + m_font_link->GetFontCodePages(hdc, m_hFont, &m_font_code_pages); + ReleaseDC(NULL, hdc); + } + LOGFONT lf; + GetObject(m_hFont, sizeof(LOGFONT), &lf); + m_bUnderline = lf.lfUnderline; + m_bStrikeOut = lf.lfStrikeOut; +} + +void cairo_font::clear() +{ + if(m_font_face) + { + cairo_font_face_destroy(m_font_face); + m_font_face = NULL; + } + for(size_t i = 0; i < m_linked_fonts.size(); i++) + { + if(m_linked_fonts[i]->hFont && m_font_link) + { + m_font_link->ReleaseFont(m_linked_fonts[i]->hFont); + } + if(m_linked_fonts[i]->font_face) + { + cairo_font_face_destroy(m_linked_fonts[i]->font_face); + } + } + m_linked_fonts.clear(); + if(m_hFont) + { + DeleteObject(m_hFont); + m_hFont = NULL; + } +} + +void cairo_font::init() +{ + m_hFont = NULL; + m_font_face = NULL; + m_font_link = NULL; + m_font_code_pages = 0; + m_size = 0; + m_bUnderline = FALSE; + m_bStrikeOut = FALSE; +} + +std::wstring cairo_font::utf8_to_wchar(const std::string& src ) +{ + if (src.empty()) return std::wstring(); + + int len = (int) src.size(); + wchar_t* str = new wchar_t[len + 1]; + MultiByteToWideChar(CP_UTF8, 0, src.c_str(), -1, str, len + 1); + std::wstring ret(str); + delete str; + return ret; +} + +std::string cairo_font::wchar_to_utf8(const std::wstring& src) +{ + if(src.empty()) return std::string(); + + int len = WideCharToMultiByte(CP_UTF8, 0, src.c_str(), -1, NULL, 0, NULL, NULL); + char* str = new char[len]; + WideCharToMultiByte(CP_UTF8, 0, src.c_str(), -1, str, len, NULL, NULL); + std::string ret(str); + delete str; + return ret; +} diff --git a/libs/litehtml/containers/windows/cairo/cairo_font.h b/libs/litehtml/containers/windows/cairo/cairo_font.h new file mode 100644 index 0000000000..fc9dd84edf --- /dev/null +++ b/libs/litehtml/containers/windows/cairo/cairo_font.h @@ -0,0 +1,120 @@ +#pragma once + +#ifndef NOMINMAX +#define NOMINMAX +#endif +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct linked_font +{ + typedef std::vector vector; + + DWORD code_pages; + HFONT hFont; + cairo_font_face_t* font_face; +}; + +struct text_chunk +{ + typedef std::vector vector; + + char* text; + linked_font* font; + + ~text_chunk() + { + if(text) + { + delete text; + } + } +}; + +struct cairo_font_metrics +{ + int height; + int ascent; + int descent; + int x_height; +}; + + +class cairo_font +{ + HFONT m_hFont; + cairo_font_face_t* m_font_face; + IMLangFontLink2* m_font_link; + DWORD m_font_code_pages; + linked_font::vector m_linked_fonts; + int m_size; + BOOL m_bUnderline; + BOOL m_bStrikeOut; + cairo_font_metrics m_metrics; +public: + // fonts are not thread safe :( + // you have to declare and initialize cairo_font::m_sync before the first using. + static CRITICAL_SECTION m_sync; + + cairo_font(IMLangFontLink2* fl, HFONT hFont, int size); + cairo_font(IMLangFontLink2* fl, LPCWSTR facename, int size, int weight, BOOL italic, BOOL strikeout, BOOL underline); + + void init(); + ~cairo_font(); + + void show_text(cairo_t* cr, int x, int y, const char*); + int text_width(cairo_t* cr, const char* str); + void load_metrics(cairo_t* cr); + cairo_font_metrics& metrics(); + static std::wstring utf8_to_wchar(const std::string& src); + static std::string wchar_to_utf8(const std::wstring& src); +private: + void split_text(const char* str, text_chunk::vector& chunks); + void free_text_chunks(text_chunk::vector& chunks); + cairo_font_face_t* create_font_face(HFONT fnt); + void set_font(HFONT hFont); + void clear(); + int text_width(cairo_t* cr, text_chunk::vector& chunks); + void lock(); + void unlock(); + int round_d(double val); + void get_metrics(cairo_t* cr, cairo_font_metrics* fm); +}; + +inline void cairo_font::lock() +{ + EnterCriticalSection(&m_sync); +} + +inline void cairo_font::unlock() +{ + LeaveCriticalSection(&m_sync); +} + +inline int cairo_font::round_d(double val) +{ + int int_val = (int) val; + if(val - int_val >= 0.5) + { + int_val++; + } + return int_val; +} + +inline cairo_font_metrics& cairo_font::metrics() +{ + return m_metrics; +} + +inline void cairo_font::load_metrics(cairo_t* cr) +{ + get_metrics(cr, &m_metrics); +} diff --git a/libs/litehtml/containers/windows/cairo/windows_container.cpp b/libs/litehtml/containers/windows/cairo/windows_container.cpp new file mode 100644 index 0000000000..e19ad337e7 --- /dev/null +++ b/libs/litehtml/containers/windows/cairo/windows_container.cpp @@ -0,0 +1,194 @@ +#include "windows_container.h" +#define _USE_MATH_DEFINES +#include +#include "cairo_font.h" +#include + +windows_container::windows_container(void) +{ + m_temp_surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 2, 2); + m_temp_cr = cairo_create(m_temp_surface); + m_font_link = NULL; + CoCreateInstance(CLSID_CMultiLanguage, NULL, CLSCTX_ALL, IID_IMLangFontLink2, (void**) &m_font_link); +} + +windows_container::~windows_container(void) +{ + clear_images(); + if(m_font_link) + { + m_font_link->Release(); + } + cairo_surface_destroy(m_temp_surface); + cairo_destroy(m_temp_cr); +} + +litehtml::uint_ptr windows_container::create_font( const char* faceName, int size, int weight, litehtml::font_style italic, unsigned int decoration, litehtml::font_metrics* fm ) +{ + std::wstring fnt_name = L"sans-serif"; + + litehtml::string_vector fonts; + litehtml::split_string(faceName, fonts, ","); + if(!fonts.empty()) + { + litehtml::trim(fonts[0]); + fnt_name = cairo_font::utf8_to_wchar(fonts[0]); + if (fnt_name.front() == L'"' || fnt_name.front() == L'\'') + { + fnt_name.erase(0, 1); + } + if (fnt_name.back() == L'"' || fnt_name.back() == L'\'') + { + fnt_name.erase(fnt_name.length() - 1, 1); + } + } + + cairo_font* fnt = new cairo_font( m_font_link, + fnt_name.c_str(), + size, + weight, + (italic == litehtml::font_style_italic) ? TRUE : FALSE, + (decoration & litehtml::font_decoration_linethrough) ? TRUE : FALSE, + (decoration & litehtml::font_decoration_underline) ? TRUE : FALSE); + + cairo_save(m_temp_cr); + fnt->load_metrics(m_temp_cr); + + if(fm) + { + fm->ascent = fnt->metrics().ascent; + fm->descent = fnt->metrics().descent; + fm->height = fnt->metrics().height; + fm->x_height = fnt->metrics().x_height; + if(italic == litehtml::font_style_italic || decoration) + { + fm->draw_spaces = true; + } else + { + fm->draw_spaces = false; + } + } + + cairo_restore(m_temp_cr); + + return (litehtml::uint_ptr) fnt; +} + +void windows_container::delete_font( litehtml::uint_ptr hFont ) +{ + cairo_font* fnt = (cairo_font*) hFont; + if(fnt) + { + delete fnt; + } +} + +int windows_container::text_width( const char* text, litehtml::uint_ptr hFont ) +{ + cairo_font* fnt = (cairo_font*) hFont; + + cairo_save(m_temp_cr); + int ret = fnt->text_width(m_temp_cr, text); + cairo_restore(m_temp_cr); + return ret; +} + +void windows_container::draw_text( litehtml::uint_ptr hdc, const char* text, litehtml::uint_ptr hFont, litehtml::web_color color, const litehtml::position& pos ) +{ + if(hFont) + { + cairo_font* fnt = (cairo_font*) hFont; + cairo_t* cr = (cairo_t*) hdc; + cairo_save(cr); + + apply_clip(cr); + + int x = pos.left(); + int y = pos.bottom() - fnt->metrics().descent; + + set_color(cr, color); + fnt->show_text(cr, x, y, text); + + cairo_restore(cr); + } +} + +litehtml::string windows_container::resolve_color(const litehtml::string& color) const +{ + struct custom_color + { + const char* name; + int color_index; + }; + + static custom_color colors[] = { + { "ActiveBorder", COLOR_ACTIVEBORDER}, + { "ActiveCaption", COLOR_ACTIVECAPTION}, + { "AppWorkspace", COLOR_APPWORKSPACE }, + { "Background", COLOR_BACKGROUND }, + { "ButtonFace", COLOR_BTNFACE }, + { "ButtonHighlight", COLOR_BTNHIGHLIGHT }, + { "ButtonShadow", COLOR_BTNSHADOW }, + { "ButtonText", COLOR_BTNTEXT }, + { "CaptionText", COLOR_CAPTIONTEXT }, + { "GrayText", COLOR_GRAYTEXT }, + { "Highlight", COLOR_HIGHLIGHT }, + { "HighlightText", COLOR_HIGHLIGHTTEXT }, + { "InactiveBorder", COLOR_INACTIVEBORDER }, + { "InactiveCaption", COLOR_INACTIVECAPTION }, + { "InactiveCaptionText", COLOR_INACTIVECAPTIONTEXT }, + { "InfoBackground", COLOR_INFOBK }, + { "InfoText", COLOR_INFOTEXT }, + { "Menu", COLOR_MENU }, + { "MenuText", COLOR_MENUTEXT }, + { "Scrollbar", COLOR_SCROLLBAR }, + { "ThreeDDarkShadow", COLOR_3DDKSHADOW }, + { "ThreeDFace", COLOR_3DFACE }, + { "ThreeDHighlight", COLOR_3DHILIGHT }, + { "ThreeDLightShadow", COLOR_3DLIGHT }, + { "ThreeDShadow", COLOR_3DSHADOW }, + { "Window", COLOR_WINDOW }, + { "WindowFrame", COLOR_WINDOWFRAME }, + { "WindowText", COLOR_WINDOWTEXT } + }; + + for (auto& clr : colors) + { + if (!litehtml::t_strcasecmp(clr.name, color.c_str())) + { + char str_clr[20]; + DWORD rgb_color = GetSysColor(clr.color_index); + StringCchPrintfA(str_clr, 20, "#%02X%02X%02X", GetRValue(rgb_color), GetGValue(rgb_color), GetBValue(rgb_color)); + return std::move(litehtml::string(str_clr)); + } + } + return std::move(litehtml::string()); +} + +cairo_surface_t* windows_container::get_image(const std::string& url) +{ + return nullptr; +} + +double windows_container::get_screen_dpi() const +{ + HDC hdc = GetDC(NULL); + int ret = GetDeviceCaps(hdc, LOGPIXELSX); + ReleaseDC(NULL, hdc); + return ret; +} + +int windows_container::get_screen_width() const +{ + HDC hdc = GetDC(NULL); + int ret = GetDeviceCaps(hdc, HORZRES); + ReleaseDC(NULL, hdc); + return ret; +} +int windows_container::get_screen_height() const +{ + HDC hdc = GetDC(NULL); + int ret = GetDeviceCaps(hdc, VERTRES); + ReleaseDC(NULL, hdc); + return ret; +} diff --git a/libs/litehtml/containers/windows/cairo/windows_container.h b/libs/litehtml/containers/windows/cairo/windows_container.h new file mode 100644 index 0000000000..daae519cab --- /dev/null +++ b/libs/litehtml/containers/windows/cairo/windows_container.h @@ -0,0 +1,39 @@ +#pragma once +#ifndef NOMINMAX +#define NOMINMAX +#endif +#include +#include +#include +#include +#include +#include +#include +#include "cairo.h" +#include "cairo-win32.h" +#include +#include +#include +#include "../../libs/litehtml/containers/cairo/container_cairo.h" + +class windows_container : public container_cairo +{ +protected: + cairo_surface_t* m_temp_surface; + cairo_t* m_temp_cr; + IMLangFontLink2* m_font_link; +public: + windows_container(void); + virtual ~windows_container(void); + + litehtml::uint_ptr create_font(const char* faceName, int size, int weight, litehtml::font_style italic, unsigned int decoration, litehtml::font_metrics* fm) override; + void delete_font(litehtml::uint_ptr hFont) override; + int text_width(const char* text, litehtml::uint_ptr hFont) override; + void draw_text(litehtml::uint_ptr hdc, const char* text, litehtml::uint_ptr hFont, litehtml::web_color color, const litehtml::position& pos) override; + litehtml::string resolve_color(const litehtml::string& color) const override; + + cairo_surface_t* get_image(const std::string& url) override; + double get_screen_dpi() const override; + int get_screen_width() const override; + int get_screen_height() const override; +}; diff --git a/libs/litehtml/containers/windows/gdiplus/gdiplus_container.cpp b/libs/litehtml/containers/windows/gdiplus/gdiplus_container.cpp new file mode 100644 index 0000000000..bebd816037 --- /dev/null +++ b/libs/litehtml/containers/windows/gdiplus/gdiplus_container.cpp @@ -0,0 +1,241 @@ +#ifndef NOMINMAX +#define NOMINMAX +#endif +#include +#include +#include "gdiplus_container.h" +#pragma comment(lib, "gdiplus.lib") +using namespace Gdiplus; +using namespace litehtml; + +gdiplus_container::gdiplus_container() +{ + GdiplusStartupInput gdiplusStartupInput; + GdiplusStartup(&m_gdiplusToken, &gdiplusStartupInput, NULL); +} + +gdiplus_container::~gdiplus_container() +{ + clear_images(); + GdiplusShutdown(m_gdiplusToken); +} + +static Color gdiplus_color(web_color color) +{ + return Color(color.alpha, color.red, color.green, color.blue); +} + +void gdiplus_container::draw_ellipse(HDC hdc, int x, int y, int width, int height, web_color color, int line_width) +{ + Graphics graphics(hdc); + + graphics.SetCompositingQuality(CompositingQualityHighQuality); + graphics.SetSmoothingMode(SmoothingModeAntiAlias); + + Pen pen(gdiplus_color(color)); + graphics.DrawEllipse(&pen, x, y, width, height); +} + +void gdiplus_container::fill_ellipse(HDC hdc, int x, int y, int width, int height, web_color color) +{ + Graphics graphics(hdc); + + graphics.SetCompositingQuality(CompositingQualityHighQuality); + graphics.SetSmoothingMode(SmoothingModeAntiAlias); + + SolidBrush brush(gdiplus_color(color)); + graphics.FillEllipse(&brush, x, y, width, height); +} + +void gdiplus_container::fill_rect(HDC hdc, int x, int y, int width, int height, web_color color) +{ + Graphics graphics(hdc); + + SolidBrush brush(gdiplus_color(color)); + graphics.FillRectangle(&brush, x, y, width, height); +} + +void gdiplus_container::get_img_size(uint_ptr img, size& sz) +{ + Bitmap* bmp = (Bitmap*)img; + if (bmp) + { + sz.width = bmp->GetWidth(); + sz.height = bmp->GetHeight(); + } +} + +void gdiplus_container::free_image(uint_ptr img) +{ + Bitmap* bmp = (Bitmap*)img; + delete bmp; +} + +void gdiplus_container::draw_img_bg(HDC hdc, uint_ptr img, const background_paint& bg) +{ + Bitmap* bgbmp = (Bitmap*)img; + + Graphics graphics(hdc); + graphics.SetInterpolationMode(InterpolationModeNearestNeighbor); + graphics.SetPixelOffsetMode(PixelOffsetModeHalf); + + Region reg(Rect(bg.border_box.left(), bg.border_box.top(), bg.border_box.width, bg.border_box.height)); + graphics.SetClip(®); + + Bitmap* scaled_img = nullptr; + if (bg.image_size.width != bgbmp->GetWidth() || bg.image_size.height != bgbmp->GetHeight()) + { + scaled_img = new Bitmap(bg.image_size.width, bg.image_size.height); + Graphics gr(scaled_img); + gr.SetPixelOffsetMode(PixelOffsetModeHighQuality); + gr.DrawImage(bgbmp, 0, 0, bg.image_size.width, bg.image_size.height); + bgbmp = scaled_img; + } + + switch (bg.repeat) + { + case background_repeat_no_repeat: + { + graphics.DrawImage(bgbmp, bg.position_x, bg.position_y, bgbmp->GetWidth(), bgbmp->GetHeight()); + } + break; + case background_repeat_repeat_x: + { + CachedBitmap bmp(bgbmp, &graphics); + int x = bg.position_x; + while(x > bg.clip_box.left()) x -= bgbmp->GetWidth(); + for(; x < bg.clip_box.right(); x += bgbmp->GetWidth()) + { + graphics.DrawCachedBitmap(&bmp, x, bg.position_y); + } + } + break; + case background_repeat_repeat_y: + { + CachedBitmap bmp(bgbmp, &graphics); + int y = bg.position_y; + while(y > bg.clip_box.top()) y -= bgbmp->GetHeight(); + for(; y < bg.clip_box.bottom(); y += bgbmp->GetHeight()) + { + graphics.DrawCachedBitmap(&bmp, bg.position_x, y); + } + } + break; + case background_repeat_repeat: + { + CachedBitmap bmp(bgbmp, &graphics); + int x = bg.position_x; + while(x > bg.clip_box.left()) x -= bgbmp->GetWidth(); + int y0 = bg.position_y; + while(y0 > bg.clip_box.top()) y0 -= bgbmp->GetHeight(); + + for(; x < bg.clip_box.right(); x += bgbmp->GetWidth()) + { + for(int y = y0; y < bg.clip_box.bottom(); y += bgbmp->GetHeight()) + { + graphics.DrawCachedBitmap(&bmp, x, y); + } + } + } + break; + } + + delete scaled_img; +} + +// length of dash and space for "dashed" style, in multiples of pen width +const float dash = 3; +const float space = 2; + +static void draw_horz_border(Graphics& graphics, const border& border, int y, int left, int right) +{ + if (border.style != border_style_double || border.width < 3) + { + if (border.width == 1) right--; // 1px-wide lines are longer by one pixel in GDI+ (the endpoint is also drawn) + Pen pen(gdiplus_color(border.color), (float)border.width); + if (border.style == border_style_dotted) + { + float dashValues[2] = { 1, 1 }; + pen.SetDashPattern(dashValues, 2); + } + else if (border.style == border_style_dashed) + { + float dashValues[2] = { dash, space }; + pen.SetDashPattern(dashValues, 2); + } + graphics.DrawLine(&pen, + Point(left, y + border.width / 2), + Point(right, y + border.width / 2)); + } + else + { + int single_line_width = (int)round(border.width / 3.); + if (single_line_width == 1) right--; + Pen pen(gdiplus_color(border.color), (float)single_line_width); + graphics.DrawLine(&pen, + Point(left, y + single_line_width / 2), + Point(right, y + single_line_width / 2)); + graphics.DrawLine(&pen, + Point(left, y + border.width - 1 - single_line_width / 2), + Point(right, y + border.width - 1 - single_line_width / 2)); + } +} + +static void draw_vert_border(Graphics& graphics, const border& border, int x, int top, int bottom) +{ + if (border.style != border_style_double || border.width < 3) + { + if (border.width == 1) bottom--; + Pen pen(gdiplus_color(border.color), (float)border.width); + if (border.style == border_style_dotted) + { + float dashValues[2] = { 1, 1 }; + pen.SetDashPattern(dashValues, 2); + } + else if (border.style == border_style_dashed) + { + float dashValues[2] = { dash, space }; + pen.SetDashPattern(dashValues, 2); + } + graphics.DrawLine(&pen, + Point(x + border.width / 2, top), + Point(x + border.width / 2, bottom)); + } + else + { + int single_line_width = (int)round(border.width / 3.); + if (single_line_width == 1) bottom--; + Pen pen(gdiplus_color(border.color), (float)single_line_width); + graphics.DrawLine(&pen, + Point(x + single_line_width / 2, top), + Point(x + single_line_width / 2, bottom)); + graphics.DrawLine(&pen, + Point(x + border.width - 1 - single_line_width / 2, top), + Point(x + border.width - 1 - single_line_width / 2, bottom)); + } +} + +void gdiplus_container::draw_borders(uint_ptr hdc, const borders& borders, const position& draw_pos, bool root) +{ + apply_clip((HDC) hdc); + Graphics graphics((HDC)hdc); + + if (borders.left.width != 0) + { + draw_vert_border(graphics, borders.left, draw_pos.left(), draw_pos.top(), draw_pos.bottom()); + } + if (borders.right.width != 0) + { + draw_vert_border(graphics, borders.right, draw_pos.right() - borders.right.width, draw_pos.top(), draw_pos.bottom()); + } + if (borders.top.width != 0) + { + draw_horz_border(graphics, borders.top, draw_pos.top(), draw_pos.left(), draw_pos.right()); + } + if (borders.bottom.width != 0) + { + draw_horz_border(graphics, borders.bottom, draw_pos.bottom() - borders.bottom.width, draw_pos.left(), draw_pos.right()); + } + + release_clip((HDC) hdc); +} diff --git a/libs/litehtml/containers/windows/gdiplus/gdiplus_container.h b/libs/litehtml/containers/windows/gdiplus/gdiplus_container.h new file mode 100644 index 0000000000..a5a61382c3 --- /dev/null +++ b/libs/litehtml/containers/windows/gdiplus/gdiplus_container.h @@ -0,0 +1,23 @@ +#pragma once +#include "..\win32\win32_container.h" + +class gdiplus_container : public win32_container +{ +public: + gdiplus_container(); + virtual ~gdiplus_container(); + +private: + ULONG_PTR m_gdiplusToken; + +protected: + // win32_container members + void draw_ellipse(HDC hdc, int x, int y, int width, int height, litehtml::web_color color, int line_width) override; + void fill_ellipse(HDC hdc, int x, int y, int width, int height, litehtml::web_color color) override; + void fill_rect(HDC hdc, int x, int y, int width, int height, litehtml::web_color color) override; + void get_img_size(uint_ptr img, litehtml::size& sz) override; + void free_image(uint_ptr img) override; + void draw_img_bg(HDC hdc, uint_ptr img, const litehtml::background_paint& bg) override; + // litehtml::document_container members + void draw_borders(uint_ptr hdc, const litehtml::borders& borders, const litehtml::position& draw_pos, bool root) override; +}; diff --git a/libs/litehtml/containers/windows/win32/win32_container.cpp b/libs/litehtml/containers/windows/win32/win32_container.cpp new file mode 100644 index 0000000000..520b1ed234 --- /dev/null +++ b/libs/litehtml/containers/windows/win32/win32_container.cpp @@ -0,0 +1,426 @@ +#include "win32_container.h" + +win32_container::win32_container() +{ + m_hClipRgn = NULL; + m_tmp_hdc = GetDC(NULL); + InitializeCriticalSection(&m_img_sync); + + EnumFonts(m_tmp_hdc, NULL, EnumFontsProc, (LPARAM)this); + m_installed_fonts.insert(L"monospace"); + m_installed_fonts.insert(L"serif"); + m_installed_fonts.insert(L"sans-serif"); + m_installed_fonts.insert(L"fantasy"); + m_installed_fonts.insert(L"cursive"); +} + +win32_container::~win32_container() +{ + DeleteCriticalSection(&m_img_sync); + if(m_hClipRgn) + { + DeleteObject(m_hClipRgn); + } + ReleaseDC(NULL, m_tmp_hdc); +} + +int CALLBACK win32_container::EnumFontsProc(const LOGFONT* lplf, const TEXTMETRIC* lptm, DWORD dwType, LPARAM lpData) +{ + win32_container* container = (win32_container*)lpData; + container->m_installed_fonts.insert(lplf->lfFaceName); + return 1; +} + +static LPCWSTR get_exact_font_name(LPCWSTR facename) +{ + if (!lstrcmpi(facename, L"monospace")) return L"Courier New"; + else if (!lstrcmpi(facename, L"serif")) return L"Times New Roman"; + else if (!lstrcmpi(facename, L"sans-serif")) return L"Arial"; + else if (!lstrcmpi(facename, L"fantasy")) return L"Impact"; + else if (!lstrcmpi(facename, L"cursive")) return L"Comic Sans MS"; + else return facename; +} + +static void trim_quotes(litehtml::string& str) +{ + if (str.front() == '"' || str.front() == '\'') + str.erase(0, 1); + + if (str.back() == '"' || str.back() == '\'') + str.erase(str.length() - 1, 1); +} + +litehtml::uint_ptr win32_container::create_font( const char* font_list, int size, int weight, litehtml::font_style italic, unsigned int decoration, litehtml::font_metrics* fm ) +{ + std::wstring font_name; + litehtml::string_vector fonts; + litehtml::split_string(font_list, fonts, ","); + bool found = false; + for (auto& name : fonts) + { + litehtml::trim(name); + trim_quotes(name); + std::wstring wname = (const wchar_t*)litehtml_to_wchar(name.c_str()); + if (m_installed_fonts.count(wname)) + { + font_name = wname; + found = true; + break; + } + } + if (!found) font_name = litehtml_to_wchar(get_default_font_name()); + font_name = get_exact_font_name(font_name.c_str()); + + LOGFONT lf = {}; + wcscpy_s(lf.lfFaceName, LF_FACESIZE, font_name.c_str()); + + lf.lfHeight = -size; + lf.lfWeight = weight; + lf.lfItalic = (italic == litehtml::font_style_italic) ? TRUE : FALSE; + lf.lfCharSet = DEFAULT_CHARSET; + lf.lfOutPrecision = OUT_DEFAULT_PRECIS; + lf.lfClipPrecision = CLIP_DEFAULT_PRECIS; + lf.lfQuality = DEFAULT_QUALITY; + lf.lfStrikeOut = (decoration & litehtml::font_decoration_linethrough) ? TRUE : FALSE; + lf.lfUnderline = (decoration & litehtml::font_decoration_underline) ? TRUE : FALSE; + HFONT hFont = CreateFontIndirect(&lf); + + if (fm) + { + SelectObject(m_tmp_hdc, hFont); + TEXTMETRIC tm = {}; + GetTextMetrics(m_tmp_hdc, &tm); + fm->ascent = tm.tmAscent; + fm->descent = tm.tmDescent; + fm->height = tm.tmHeight; + fm->x_height = tm.tmHeight / 2; // this is an estimate; call GetGlyphOutline to get the real value + fm->draw_spaces = italic || decoration; + } + + return (uint_ptr) hFont; +} + +void win32_container::delete_font( uint_ptr hFont ) +{ + DeleteObject((HFONT) hFont); +} + +const char* win32_container::get_default_font_name() const +{ + return "Times New Roman"; +} + +int win32_container::get_default_font_size() const +{ + return 16; +} + +int win32_container::text_width( const char* text, uint_ptr hFont ) +{ + SIZE size = {}; + SelectObject(m_tmp_hdc, (HFONT)hFont); + std::wstring wtext = (const wchar_t*)litehtml_to_wchar(text); + GetTextExtentPoint32(m_tmp_hdc, wtext.c_str(), (int)wtext.size(), &size); + return size.cx; +} + +void win32_container::draw_text( uint_ptr hdc, const char* text, uint_ptr hFont, litehtml::web_color color, const litehtml::position& pos ) +{ + apply_clip((HDC) hdc); + + HFONT oldFont = (HFONT) SelectObject((HDC) hdc, (HFONT) hFont); + + SetBkMode((HDC) hdc, TRANSPARENT); + + SetTextColor((HDC) hdc, RGB(color.red, color.green, color.blue)); + + RECT rcText = { pos.left(), pos.top(), pos.right(), pos.bottom() }; + DrawText((HDC) hdc, litehtml_to_wchar(text), -1, &rcText, DT_SINGLELINE | DT_NOPREFIX | DT_BOTTOM | DT_NOCLIP); + + SelectObject((HDC) hdc, oldFont); + + release_clip((HDC) hdc); +} + +int win32_container::pt_to_px( int pt ) const +{ + return MulDiv(pt, GetDeviceCaps(m_tmp_hdc, LOGPIXELSY), 72); +} + +void win32_container::draw_list_marker(uint_ptr hdc, const litehtml::list_marker& marker) +{ + apply_clip((HDC)hdc); + + int top_margin = marker.pos.height / 3; + if (top_margin < 4) + top_margin = 0; + + int draw_x = marker.pos.x; + int draw_y = marker.pos.y + top_margin; + int draw_width = marker.pos.height - top_margin * 2; + int draw_height = marker.pos.height - top_margin * 2; + + switch (marker.marker_type) + { + case litehtml::list_style_type_circle: + { + draw_ellipse((HDC)hdc, draw_x, draw_y, draw_width, draw_height, marker.color, 1); + } + break; + case litehtml::list_style_type_disc: + { + fill_ellipse((HDC)hdc, draw_x, draw_y, draw_width, draw_height, marker.color); + } + break; + case litehtml::list_style_type_square: + { + fill_rect((HDC)hdc, draw_x, draw_y, draw_width, draw_height, marker.color); + } + break; + } + release_clip((HDC)hdc); +} + +void win32_container::make_url_utf8(const char* url, const char* basepath, std::wstring& out) +{ + make_url(litehtml::utf8_to_wchar(url), litehtml::utf8_to_wchar(basepath), out); +} + +void win32_container::load_image( const char* src, const char* baseurl, bool redraw_on_ready ) +{ + std::wstring url; + make_url_utf8(src, baseurl, url); + + lock_images_cache(); + if (m_images.count(url) == 0) + { + unlock_images_cache(); + uint_ptr img = get_image(url.c_str(), redraw_on_ready); + add_image(url.c_str(), img); + } + else + { + unlock_images_cache(); + } +} + +void win32_container::add_image(LPCWSTR url, uint_ptr img) +{ + lock_images_cache(); + m_images[url] = img; + unlock_images_cache(); +} + +void win32_container::get_image_size( const char* src, const char* baseurl, litehtml::size& sz ) +{ + std::wstring url; + make_url_utf8(src, baseurl, url); + + sz.width = 0; + sz.height = 0; + + lock_images_cache(); + images_map::iterator img = m_images.find(url); + if(img != m_images.end() && img->second) + { + get_img_size(img->second, sz); + } + unlock_images_cache(); +} + +void win32_container::clear_images() +{ + lock_images_cache(); + for(auto& img : m_images) + { + if(img.second) + { + free_image(img.second); + } + } + m_images.clear(); + unlock_images_cache(); +} + +void win32_container::lock_images_cache() +{ + EnterCriticalSection(&m_img_sync); +} + +void win32_container::unlock_images_cache() +{ + LeaveCriticalSection(&m_img_sync); +} + +void win32_container::draw_background( uint_ptr _hdc, const std::vector& bg ) +{ + HDC hdc = (HDC)_hdc; + apply_clip(hdc); + + auto border_box = bg.back().border_box; + auto color = bg.back().color; + fill_rect(hdc, border_box.x, border_box.y, border_box.width, border_box.height, color); + + for (int i = (int)bg.size() - 1; i >= 0; i--) + { + std::wstring url; + make_url_utf8(bg[i].image.c_str(), bg[i].baseurl.c_str(), url); + + lock_images_cache(); + images_map::iterator img = m_images.find(url); + if (img != m_images.end() && img->second) + { + draw_img_bg(hdc, img->second, bg[i]); + } + unlock_images_cache(); + } + + release_clip(hdc); +} + +void win32_container::set_clip( const litehtml::position& pos, const litehtml::border_radiuses& bdr_radius ) +{ + m_clips.push_back(pos); +} + +void win32_container::del_clip() +{ + if(!m_clips.empty()) + { + m_clips.pop_back(); + } +} + +void win32_container::apply_clip(HDC hdc) +{ + if(m_hClipRgn) + { + DeleteObject(m_hClipRgn); + m_hClipRgn = NULL; + } + + if(!m_clips.empty()) + { + POINT ptView = {0, 0}; + GetWindowOrgEx(hdc, &ptView); + + litehtml::position clip_pos = m_clips.back(); + m_hClipRgn = CreateRectRgn(clip_pos.left() - ptView.x, clip_pos.top() - ptView.y, clip_pos.right() - ptView.x, clip_pos.bottom() - ptView.y); + SelectClipRgn(hdc, m_hClipRgn); + } +} + +void win32_container::release_clip(HDC hdc) +{ + SelectClipRgn(hdc, NULL); + + if(m_hClipRgn) + { + DeleteObject(m_hClipRgn); + m_hClipRgn = NULL; + } +} + +litehtml::element::ptr win32_container::create_element(const char* tag_name, const litehtml::string_map& attributes, const litehtml::document::ptr& doc) +{ + return 0; +} + +void win32_container::get_media_features(litehtml::media_features& media) const +{ + litehtml::position client; + get_client_rect(client); + + media.type = litehtml::media_type_screen; + media.width = client.width; + media.height = client.height; + media.color = 8; + media.monochrome = 0; + media.color_index = 256; + media.resolution = GetDeviceCaps(m_tmp_hdc, LOGPIXELSX); + media.device_width = GetDeviceCaps(m_tmp_hdc, HORZRES); + media.device_height = GetDeviceCaps(m_tmp_hdc, VERTRES); +} + +void win32_container::get_language(litehtml::string& language, litehtml::string& culture) const +{ + language = "en"; + culture = ""; +} + +void win32_container::transform_text(litehtml::string& text, litehtml::text_transform tt) +{ + if (text.empty()) return; + + LPWSTR txt = _wcsdup(litehtml_to_wchar(text.c_str())); + switch (tt) + { + case litehtml::text_transform_capitalize: + CharUpperBuff(txt, 1); + break; + case litehtml::text_transform_uppercase: + CharUpperBuff(txt, lstrlen(txt)); + break; + case litehtml::text_transform_lowercase: + CharLowerBuff(txt, lstrlen(txt)); + break; + } + text = litehtml_from_wchar(txt); + free(txt); +} + +void win32_container::link(const litehtml::document::ptr& doc, const litehtml::element::ptr& el) +{ +} + +litehtml::string win32_container::resolve_color(const litehtml::string& color) const +{ + struct custom_color + { + const char* name; + int color_index; + }; + + static custom_color colors[] = { + { "ActiveBorder", COLOR_ACTIVEBORDER }, + { "ActiveCaption", COLOR_ACTIVECAPTION }, + { "AppWorkspace", COLOR_APPWORKSPACE }, + { "Background", COLOR_BACKGROUND }, + { "ButtonFace", COLOR_BTNFACE }, + { "ButtonHighlight", COLOR_BTNHIGHLIGHT }, + { "ButtonShadow", COLOR_BTNSHADOW }, + { "ButtonText", COLOR_BTNTEXT }, + { "CaptionText", COLOR_CAPTIONTEXT }, + { "GrayText", COLOR_GRAYTEXT }, + { "Highlight", COLOR_HIGHLIGHT }, + { "HighlightText", COLOR_HIGHLIGHTTEXT }, + { "InactiveBorder", COLOR_INACTIVEBORDER }, + { "InactiveCaption", COLOR_INACTIVECAPTION }, + { "InactiveCaptionText", COLOR_INACTIVECAPTIONTEXT }, + { "InfoBackground", COLOR_INFOBK }, + { "InfoText", COLOR_INFOTEXT }, + { "Menu", COLOR_MENU }, + { "MenuText", COLOR_MENUTEXT }, + { "Scrollbar", COLOR_SCROLLBAR }, + { "ThreeDDarkShadow", COLOR_3DDKSHADOW }, + { "ThreeDFace", COLOR_3DFACE }, + { "ThreeDHighlight", COLOR_3DHILIGHT }, + { "ThreeDLightShadow", COLOR_3DLIGHT }, + { "ThreeDShadow", COLOR_3DSHADOW }, + { "Window", COLOR_WINDOW }, + { "WindowFrame", COLOR_WINDOWFRAME }, + { "WindowText", COLOR_WINDOWTEXT } + }; + + for (auto& clr : colors) + { + if (!litehtml::t_strcasecmp(color.c_str(), clr.name)) + { + char str_clr[20]; + DWORD rgb_color = GetSysColor(clr.color_index); + t_snprintf(str_clr, 20, "#%02X%02X%02X", GetRValue(rgb_color), GetGValue(rgb_color), GetBValue(rgb_color)); + return std::move(litehtml::string(str_clr)); + } + } + return std::move(litehtml::string()); +} diff --git a/libs/litehtml/containers/windows/win32/win32_container.h b/libs/litehtml/containers/windows/win32/win32_container.h new file mode 100644 index 0000000000..93a9d81086 --- /dev/null +++ b/libs/litehtml/containers/windows/win32/win32_container.h @@ -0,0 +1,75 @@ +#pragma once +#ifndef NOMINMAX +#define NOMINMAX +#endif +#include +#include +#include + +class win32_container : public litehtml::document_container +{ +public: + typedef litehtml::uint_ptr uint_ptr; + typedef std::map images_map; + +protected: + images_map m_images; + litehtml::position::vector m_clips; + HRGN m_hClipRgn; + std::set m_installed_fonts; + HDC m_tmp_hdc; + CRITICAL_SECTION m_img_sync; + +public: + win32_container(); + virtual ~win32_container(); + + // litehtml::document_container members + uint_ptr create_font(const char* faceName, int size, int weight, litehtml::font_style italic, unsigned int decoration, litehtml::font_metrics* fm) override; + void delete_font(uint_ptr hFont) override; + const char* get_default_font_name() const override; + int get_default_font_size() const override; + int text_width(const char* text, uint_ptr hFont) override; + void draw_text(uint_ptr hdc, const char* text, uint_ptr hFont, litehtml::web_color color, const litehtml::position& pos) override; + void transform_text(litehtml::string& text, litehtml::text_transform tt) override; + + int pt_to_px(int pt) const override; + void draw_list_marker(uint_ptr hdc, const litehtml::list_marker& marker) override; + void load_image(const char* src, const char* baseurl, bool redraw_on_ready) override; + void get_image_size(const char* src, const char* baseurl, litehtml::size& sz) override; + void draw_background(uint_ptr hdc, const std::vector& bg) override; + + void set_clip(const litehtml::position& pos, const litehtml::border_radiuses& bdr_radius) override; + void del_clip() override; + litehtml::element::ptr create_element(const char* tag_name, const litehtml::string_map& attributes, const litehtml::document::ptr& doc) override; + void get_media_features(litehtml::media_features& media) const override; + void get_language(litehtml::string& language, litehtml::string& culture) const override; + void link(const litehtml::document::ptr& doc, const litehtml::element::ptr& el) override; + litehtml::string resolve_color(const litehtml::string& color) const override; + +protected: + void apply_clip(HDC hdc); + void release_clip(HDC hdc); + + virtual void make_url(LPCWSTR url, LPCWSTR basepath, std::wstring& out) = 0; + void make_url_utf8(const char* url, const char* basepath, std::wstring& out); + virtual void get_client_rect(litehtml::position& client) const = 0; + + // get_image is called by load_image. + // if url_or_path is URL then get_image may return 0, the image should be added later by add_image when it becomes available + virtual uint_ptr get_image(LPCWSTR url_or_path, bool redraw_on_ready) = 0; + void add_image(LPCWSTR url, uint_ptr img); + void clear_images(); + virtual void free_image(uint_ptr img) = 0; + virtual void get_img_size(uint_ptr img, litehtml::size& sz) = 0; + virtual void draw_img_bg(HDC hdc, uint_ptr img, const litehtml::background_paint& bg) = 0; + + virtual void draw_ellipse(HDC hdc, int x, int y, int width, int height, litehtml::web_color color, int line_width) = 0; + virtual void fill_ellipse(HDC hdc, int x, int y, int width, int height, litehtml::web_color color) = 0; + virtual void fill_rect(HDC hdc, int x, int y, int width, int height, litehtml::web_color color) = 0; + +private: + static int CALLBACK EnumFontsProc(const LOGFONT* lplf, const TEXTMETRIC* lptm, DWORD dwType, LPARAM lpData); + void lock_images_cache(); + void unlock_images_cache(); +}; diff --git a/libs/litehtml/include/litehtml.h b/libs/litehtml/include/litehtml.h new file mode 100644 index 0000000000..2537aee839 --- /dev/null +++ b/libs/litehtml/include/litehtml.h @@ -0,0 +1,11 @@ +#ifndef LITEHTML_H +#define LITEHTML_H + +#include +#include +#include +#include +#include +#include + +#endif // LITEHTML_H diff --git a/libs/litehtml/include/litehtml/background.h b/libs/litehtml/include/litehtml/background.h new file mode 100644 index 0000000000..c56443d548 --- /dev/null +++ b/libs/litehtml/include/litehtml/background.h @@ -0,0 +1,69 @@ +#ifndef LH_BACKGROUND_H +#define LH_BACKGROUND_H + +#include "types.h" +#include "css_length.h" +#include "css_position.h" +#include "web_color.h" +#include "borders.h" + +namespace litehtml +{ + class background + { + public: + string_vector m_image; + string m_baseurl; + web_color m_color; + int_vector m_attachment; + length_vector m_position_x; + length_vector m_position_y; + size_vector m_size; + int_vector m_repeat; + int_vector m_clip; + int_vector m_origin; + + bool is_empty() const + { + if(m_color.alpha != 0) return false; + if(m_image.empty()) return true; + for(const auto& img : m_image) + { + if(!img.empty()) return false; + } + return true; + } + }; + + class background_paint + { + public: + string image; + string baseurl; + background_attachment attachment; + background_repeat repeat; + web_color color; + position clip_box; + position origin_box; + position border_box; + border_radiuses border_radius; + size image_size; + int position_x; + int position_y; + bool is_root; + + public: + background_paint() + { + attachment = background_attachment_scroll; + repeat = background_repeat_repeat; + color = web_color::transparent; + position_x = 0; + position_y = 0; + is_root = false; + } + }; + +} + +#endif // LH_BACKGROUND_H diff --git a/libs/litehtml/include/litehtml/borders.h b/libs/litehtml/include/litehtml/borders.h new file mode 100644 index 0000000000..9c47abca07 --- /dev/null +++ b/libs/litehtml/include/litehtml/borders.h @@ -0,0 +1,345 @@ +#ifndef LH_BORDERS_H +#define LH_BORDERS_H + +#include "css_length.h" +#include "types.h" +#include "web_color.h" + +namespace litehtml +{ + struct css_border + { + css_length width; + border_style style; + web_color color; + + css_border() + { + style = border_style_none; + } + + css_border(const css_border& val) + { + width = val.width; + style = val.style; + color = val.color; + } + + css_border& operator=(const css_border& val) + { + width = val.width; + style = val.style; + color = val.color; + return *this; + } + + string to_string() const; + }; + + struct border + { + int width; + border_style style; + web_color color; + + border() + { + width = 0; + } + border(const border& val) + { + width = val.width; + style = val.style; + color = val.color; + } + border(const css_border& val) + { + width = (int) val.width.val(); + style = val.style; + color = val.color; + } + border& operator=(const border& val) + { + width = val.width; + style = val.style; + color = val.color; + return *this; + } + border& operator=(const css_border& val) + { + width = (int) val.width.val(); + style = val.style; + color = val.color; + return *this; + } + }; + + struct border_radiuses + { + int top_left_x; + int top_left_y; + + int top_right_x; + int top_right_y; + + int bottom_right_x; + int bottom_right_y; + + int bottom_left_x; + int bottom_left_y; + + border_radiuses() + { + top_left_x = 0; + top_left_y = 0; + top_right_x = 0; + top_right_y = 0; + bottom_right_x = 0; + bottom_right_y = 0; + bottom_left_x = 0; + bottom_left_y = 0; + } + border_radiuses(const border_radiuses& val) + { + top_left_x = val.top_left_x; + top_left_y = val.top_left_y; + top_right_x = val.top_right_x; + top_right_y = val.top_right_y; + bottom_right_x = val.bottom_right_x; + bottom_right_y = val.bottom_right_y; + bottom_left_x = val.bottom_left_x; + bottom_left_y = val.bottom_left_y; + } + border_radiuses& operator = (const border_radiuses& val) + { + top_left_x = val.top_left_x; + top_left_y = val.top_left_y; + top_right_x = val.top_right_x; + top_right_y = val.top_right_y; + bottom_right_x = val.bottom_right_x; + bottom_right_y = val.bottom_right_y; + bottom_left_x = val.bottom_left_x; + bottom_left_y = val.bottom_left_y; + return *this; + } + void operator += (const margins& mg) + { + top_left_x += mg.left; + top_left_y += mg.top; + top_right_x += mg.right; + top_right_y += mg.top; + bottom_right_x += mg.right; + bottom_right_y += mg.bottom; + bottom_left_x += mg.left; + bottom_left_y += mg.bottom; + fix_values(); + } + void operator -= (const margins& mg) + { + top_left_x -= mg.left; + top_left_y -= mg.top; + top_right_x -= mg.right; + top_right_y -= mg.top; + bottom_right_x -= mg.right; + bottom_right_y -= mg.bottom; + bottom_left_x -= mg.left; + bottom_left_y -= mg.bottom; + fix_values(); + } + void fix_values() + { + if (top_left_x < 0) top_left_x = 0; + if (top_left_y < 0) top_left_y = 0; + if (top_right_x < 0) top_right_x = 0; + if (top_right_y < 0) top_right_y = 0; + if (bottom_right_x < 0) bottom_right_x = 0; + if (bottom_right_y < 0) bottom_right_y = 0; + if (bottom_left_x < 0) bottom_left_x = 0; + if (bottom_left_y < 0) bottom_left_y = 0; + } + void fix_values(int width, int height) + { + fix_values(); + int half_width = width / 2; + int half_height = height / 2; + auto fix_one = [&](int& radii_x, int& radii_y) + { + double factor = std::min((double) half_width / (double) radii_x, (double) half_height / (double) radii_y); + radii_x = (int) ((double) radii_x * factor); + radii_y = (int) ((double) radii_y * factor); + }; + + if(top_left_x > half_width || top_left_y > half_height) + { + fix_one(top_left_x, top_left_y); + } + if(top_right_x > half_width || top_right_y > half_height) + { + fix_one(top_right_x, top_right_y); + } + if(bottom_right_x > half_width || bottom_right_y > half_height) + { + fix_one(bottom_right_x, bottom_right_y); + } + if(bottom_left_x > half_width || bottom_left_y > half_height) + { + fix_one(bottom_left_x, bottom_left_y); + } + } + }; + + struct css_border_radius + { + css_length top_left_x; + css_length top_left_y; + + css_length top_right_x; + css_length top_right_y; + + css_length bottom_right_x; + css_length bottom_right_y; + + css_length bottom_left_x; + css_length bottom_left_y; + + css_border_radius() + { + + } + + css_border_radius(const css_border_radius& val) + { + top_left_x = val.top_left_x; + top_left_y = val.top_left_y; + top_right_x = val.top_right_x; + top_right_y = val.top_right_y; + bottom_left_x = val.bottom_left_x; + bottom_left_y = val.bottom_left_y; + bottom_right_x = val.bottom_right_x; + bottom_right_y = val.bottom_right_y; + } + + css_border_radius& operator=(const css_border_radius& val) + { + top_left_x = val.top_left_x; + top_left_y = val.top_left_y; + top_right_x = val.top_right_x; + top_right_y = val.top_right_y; + bottom_left_x = val.bottom_left_x; + bottom_left_y = val.bottom_left_y; + bottom_right_x = val.bottom_right_x; + bottom_right_y = val.bottom_right_y; + return *this; + } + border_radiuses calc_percents(int width, int height) const + { + border_radiuses ret; + ret.bottom_left_x = bottom_left_x.calc_percent(width); + ret.bottom_left_y = bottom_left_y.calc_percent(height); + ret.top_left_x = top_left_x.calc_percent(width); + ret.top_left_y = top_left_y.calc_percent(height); + ret.top_right_x = top_right_x.calc_percent(width); + ret.top_right_y = top_right_y.calc_percent(height); + ret.bottom_right_x = bottom_right_x.calc_percent(width); + ret.bottom_right_y = bottom_right_y.calc_percent(height); + ret.fix_values(width, height); + return ret; + } + }; + + struct css_borders + { + css_border left; + css_border top; + css_border right; + css_border bottom; + css_border_radius radius; + + css_borders() = default; + + bool is_visible() const + { + return left.width.val() != 0 || right.width.val() != 0 || top.width.val() != 0 || bottom.width.val() != 0; + } + + css_borders(const css_borders& val) + { + left = val.left; + right = val.right; + top = val.top; + bottom = val.bottom; + radius = val.radius; + } + + css_borders& operator=(const css_borders& val) + { + left = val.left; + right = val.right; + top = val.top; + bottom = val.bottom; + radius = val.radius; + return *this; + } + string to_string() const + { + return "left: " + left.to_string() + + ", top: " + top.to_string() + + ", right: " + top.to_string() + + ", bottom: " + bottom.to_string(); + } + }; + + struct borders + { + border left; + border top; + border right; + border bottom; + border_radiuses radius; + + borders() = default; + + borders(const borders& val) + { + left = val.left; + right = val.right; + top = val.top; + bottom = val.bottom; + radius = val.radius; + } + + borders(const css_borders& val) + { + left = val.left; + right = val.right; + top = val.top; + bottom = val.bottom; + } + + bool is_visible() const + { + return left.width != 0 || right.width != 0 || top.width != 0 || bottom.width != 0; + } + + borders& operator=(const borders& val) + { + left = val.left; + right = val.right; + top = val.top; + bottom = val.bottom; + radius = val.radius; + return *this; + } + + borders& operator=(const css_borders& val) + { + left = val.left; + right = val.right; + top = val.top; + bottom = val.bottom; + return *this; + } + }; +} + +#endif // LH_BORDERS_H diff --git a/libs/litehtml/include/litehtml/codepoint.h b/libs/litehtml/include/litehtml/codepoint.h new file mode 100644 index 0000000000..52dd495559 --- /dev/null +++ b/libs/litehtml/include/litehtml/codepoint.h @@ -0,0 +1,51 @@ +// Copyright (C) 2020-2021 Primate Labs Inc. +// All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the names of the copyright holders nor the names of their +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +#ifndef LITEHTML_CODEPOINT_H__ +#define LITEHTML_CODEPOINT_H__ + +#include + +#include "os_types.h" + +namespace litehtml { + +bool is_ascii_codepoint(char c); + +// Returns true if the codepoint is a reserved codepoint for URLs. +// https://datatracker.ietf.org/doc/html/rfc3986#section-2.2 +bool is_url_reserved_codepoint(char c); + +// Returns true if the codepoint is a scheme codepoint for URLs. +// https://datatracker.ietf.org/doc/html/rfc3986#section-3.1 +bool is_url_scheme_codepoint(char c); + +} // namespace litehtml + +#endif // LITEHTML_CODEPOINT_H__ diff --git a/libs/litehtml/include/litehtml/css_length.h b/libs/litehtml/include/litehtml/css_length.h new file mode 100644 index 0000000000..ae787105af --- /dev/null +++ b/libs/litehtml/include/litehtml/css_length.h @@ -0,0 +1,119 @@ +#ifndef LH_CSS_LENGTH_H +#define LH_CSS_LENGTH_H + +#include "types.h" + +namespace litehtml +{ + class css_length + { + union + { + float m_value; + int m_predef; + }; + css_units m_units; + bool m_is_predefined; + public: + css_length(); + css_length(float val, css_units units = css_units_px); + css_length& operator=(float val); + + bool is_predefined() const; + void predef(int val); + int predef() const; + static css_length predef_value(int val = 0); + void set_value(float val, css_units units); + float val() const; + css_units units() const; + int calc_percent(int width) const; + void fromString(const string& str, const string& predefs = "", int defValue = 0); + static css_length from_string(const string& str, const string& predefs = "", int defValue = 0); + string to_string() const; + }; + + using length_vector = std::vector; + + // css_length inlines + + inline css_length::css_length() + { + m_value = 0; + m_predef = 0; + m_units = css_units_none; + m_is_predefined = false; + } + + inline css_length::css_length(float val, css_units units) + { + m_value = val; + m_units = units; + m_is_predefined = false; + } + + inline css_length& css_length::operator=(float val) + { + m_value = val; + m_units = css_units_px; + m_is_predefined = false; + return *this; + } + + inline bool css_length::is_predefined() const + { + return m_is_predefined; + } + + inline void css_length::predef(int val) + { + m_predef = val; + m_is_predefined = true; + } + + inline int css_length::predef() const + { + if(m_is_predefined) + { + return m_predef; + } + return 0; + } + + inline void css_length::set_value(float val, css_units units) + { + m_value = val; + m_is_predefined = false; + m_units = units; + } + + inline float css_length::val() const + { + if(!m_is_predefined) + { + return m_value; + } + return 0; + } + + inline css_units css_length::units() const + { + return m_units; + } + + inline int css_length::calc_percent(int width) const + { + if(!is_predefined()) + { + if(units() == css_units_percentage) + { + return (int) ((double) width * (double) m_value / 100.0); + } else + { + return (int) val(); + } + } + return 0; + } +} + +#endif // LH_CSS_LENGTH_H diff --git a/libs/litehtml/include/litehtml/css_margins.h b/libs/litehtml/include/litehtml/css_margins.h new file mode 100644 index 0000000000..17dc7698da --- /dev/null +++ b/libs/litehtml/include/litehtml/css_margins.h @@ -0,0 +1,44 @@ +#ifndef LH_CSS_MARGINS_H +#define LH_CSS_MARGINS_H + +#include "css_length.h" + +namespace litehtml +{ + struct css_margins + { + css_length left; + css_length right; + css_length top; + css_length bottom; + + css_margins() = default; + + css_margins(const css_margins& val) + { + left = val.left; + right = val.right; + top = val.top; + bottom = val.bottom; + } + + css_margins& operator=(const css_margins& val) + { + left = val.left; + right = val.right; + top = val.top; + bottom = val.bottom; + return *this; + } + + string to_string() const + { + return "left: " + left.to_string() + + ", right: " + right.to_string() + + ", top: " + top.to_string() + + ", bottom: " + bottom.to_string(); + } + }; +} + +#endif // LH_CSS_MARGINS_H diff --git a/libs/litehtml/include/litehtml/css_offsets.h b/libs/litehtml/include/litehtml/css_offsets.h new file mode 100644 index 0000000000..5ab175ce26 --- /dev/null +++ b/libs/litehtml/include/litehtml/css_offsets.h @@ -0,0 +1,44 @@ +#ifndef LH_CSS_OFFSETS_H +#define LH_CSS_OFFSETS_H + +#include "css_length.h" + +namespace litehtml +{ + struct css_offsets + { + css_length left; + css_length top; + css_length right; + css_length bottom; + + css_offsets() = default; + + css_offsets(const css_offsets& val) + { + left = val.left; + top = val.top; + right = val.right; + bottom = val.bottom; + } + + css_offsets& operator=(const css_offsets& val) + { + left = val.left; + top = val.top; + right = val.right; + bottom = val.bottom; + return *this; + } + + string to_string() const + { + return "left: " + left.to_string() + + ", top: " + top.to_string() + + ", right: " + right.to_string() + + ", bottom: " + bottom.to_string(); + } + }; +} + +#endif // LH_CSS_OFFSETS_H diff --git a/libs/litehtml/include/litehtml/css_position.h b/libs/litehtml/include/litehtml/css_position.h new file mode 100644 index 0000000000..978a81ab5d --- /dev/null +++ b/libs/litehtml/include/litehtml/css_position.h @@ -0,0 +1,28 @@ +#ifndef LH_CSS_POSITION_H +#define LH_CSS_POSITION_H + +#include "css_length.h" + +namespace litehtml +{ + struct css_position + { + css_length x; + css_length y; + css_length width; + css_length height; + }; + + struct css_size + { + css_length width; + css_length height; + + css_size() = default; + css_size(css_length width, css_length height) : width(width), height(height) {} + }; + + using size_vector = std::vector; +} + +#endif // LH_CSS_POSITION_H diff --git a/libs/litehtml/include/litehtml/css_properties.h b/libs/litehtml/include/litehtml/css_properties.h new file mode 100644 index 0000000000..a915616861 --- /dev/null +++ b/libs/litehtml/include/litehtml/css_properties.h @@ -0,0 +1,673 @@ +#ifndef LITEHTML_CSS_PROPERTIES_H +#define LITEHTML_CSS_PROPERTIES_H + +#include "os_types.h" +#include "types.h" +#include "css_margins.h" +#include "borders.h" +#include "css_offsets.h" +#include "background.h" + +namespace litehtml +{ + class element; + class document; + + class css_properties + { + private: + element_position m_el_position; + text_align m_text_align; + overflow m_overflow; + white_space m_white_space; + style_display m_display; + visibility m_visibility; + box_sizing m_box_sizing; + css_length m_z_index; + vertical_align m_vertical_align; + element_float m_float; + element_clear m_clear; + css_margins m_css_margins; + css_margins m_css_padding; + css_borders m_css_borders; + css_length m_css_width; + css_length m_css_height; + css_length m_css_min_width; + css_length m_css_min_height; + css_length m_css_max_width; + css_length m_css_max_height; + css_offsets m_css_offsets; + css_length m_css_text_indent; + css_length m_css_line_height; + int m_line_height; + list_style_type m_list_style_type; + list_style_position m_list_style_position; + string m_list_style_image; + string m_list_style_image_baseurl; + background m_bg; + uint_ptr m_font; + css_length m_font_size; + string m_font_family; + font_weight m_font_weight; + font_style m_font_style; + string m_text_decoration; + font_metrics m_font_metrics; + text_transform m_text_transform; + web_color m_color; + string m_cursor; + string m_content; + border_collapse m_border_collapse; + css_length m_css_border_spacing_x; + css_length m_css_border_spacing_y; + + float m_flex_grow; + float m_flex_shrink; + css_length m_flex_basis; + flex_direction m_flex_direction; + flex_wrap m_flex_wrap; + flex_justify_content m_flex_justify_content; + flex_align_items m_flex_align_items; + flex_align_items m_flex_align_self; + flex_align_content m_flex_align_content; + + caption_side m_caption_side; + + int m_order; + + private: + void compute_font(const element* el, const std::shared_ptr& doc); + void compute_background(const element* el, const std::shared_ptr& doc); + void compute_flex(const element* el, const std::shared_ptr& doc); + + public: + css_properties() : + m_el_position(element_position_static), + m_text_align(text_align_left), + m_overflow(overflow_visible), + m_white_space(white_space_normal), + m_display(display_inline), + m_visibility(visibility_visible), + m_box_sizing(box_sizing_content_box), + m_z_index(0), + m_vertical_align(va_baseline), + m_float(float_none), + m_clear(clear_none), + m_css_margins(), + m_css_padding(), + m_css_borders(), + m_css_width(), + m_css_height(), + m_css_min_width(), + m_css_min_height(), + m_css_max_width(), + m_css_max_height(), + m_css_offsets(), + m_css_text_indent(), + m_css_line_height(0), + m_line_height(0), + m_list_style_type(list_style_type_none), + m_list_style_position(list_style_position_outside), + m_bg(), + m_font(0), + m_font_size(0), + m_font_metrics(), + m_text_transform(text_transform_none), + m_border_collapse(border_collapse_separate), + m_css_border_spacing_x(), + m_css_border_spacing_y(), + m_flex_grow(0), + m_flex_shrink(1), + m_flex_direction(flex_direction_row), + m_flex_wrap(flex_wrap_nowrap), + m_flex_justify_content(flex_justify_content_flex_start), + m_flex_align_items(flex_align_items_stretch), + m_flex_align_self(flex_align_items_auto), + m_flex_align_content(flex_align_content_stretch), + m_order(0) + {} + + void compute(const element* el, const std::shared_ptr& doc); + std::vector> dump_get_attrs(); + + element_position get_position() const; + void set_position(element_position mElPosition); + + text_align get_text_align() const; + void set_text_align(text_align mTextAlign); + + overflow get_overflow() const; + void set_overflow(overflow mOverflow); + + white_space get_white_space() const; + void set_white_space(white_space mWhiteSpace); + + style_display get_display() const; + void set_display(style_display mDisplay); + + visibility get_visibility() const; + void set_visibility(visibility mVisibility); + + box_sizing get_box_sizing() const; + void set_box_sizing(box_sizing mBoxSizing); + + int get_z_index() const; + void set_z_index(int mZIndex); + + vertical_align get_vertical_align() const; + void set_vertical_align(vertical_align mVerticalAlign); + + element_float get_float() const; + void set_float(element_float mFloat); + + element_clear get_clear() const; + void set_clear(element_clear mClear); + + const css_margins &get_margins() const; + void set_margins(const css_margins &mCssMargins); + + const css_margins &get_padding() const; + void set_padding(const css_margins &mCssPadding); + + const css_borders &get_borders() const; + void set_borders(const css_borders &mCssBorders); + + const css_length &get_width() const; + void set_width(const css_length &mCssWidth); + + const css_length &get_height() const; + void set_height(const css_length &mCssHeight); + + const css_length &get_min_width() const; + void set_min_width(const css_length &mCssMinWidth); + + const css_length &get_min_height() const; + void set_min_height(const css_length &mCssMinHeight); + + const css_length &get_max_width() const; + void set_max_width(const css_length &mCssMaxWidth); + + const css_length &get_max_height() const; + void set_max_height(const css_length &mCssMaxHeight); + + const css_offsets &get_offsets() const; + void set_offsets(const css_offsets &mCssOffsets); + + const css_length &get_text_indent() const; + void set_text_indent(const css_length &mCssTextIndent); + + int get_line_height() const; + void set_line_height(int mLineHeight); + + list_style_type get_list_style_type() const; + void set_list_style_type(list_style_type mListStyleType); + + list_style_position get_list_style_position() const; + void set_list_style_position(list_style_position mListStylePosition); + + string get_list_style_image() const; + void set_list_style_image(const string& url); + + string get_list_style_image_baseurl() const; + void set_list_style_image_baseurl(const string& url); + + const background &get_bg() const; + void set_bg(const background &mBg); + + int get_font_size() const; + void set_font_size(int mFontSize); + + uint_ptr get_font() const; + void set_font(uint_ptr mFont); + + const font_metrics& get_font_metrics() const; + void set_font_metrics(const font_metrics& mFontMetrics); + + text_transform get_text_transform() const; + void set_text_transform(text_transform mTextTransform); + + web_color get_color() const; + void set_color(web_color color); + + string get_cursor() const; + void set_cursor(const string& cursor); + + string get_content() const; + void set_content(const string& content); + + border_collapse get_border_collapse() const; + void set_border_collapse(border_collapse mBorderCollapse); + + const css_length& get_border_spacing_x() const ; + void set_border_spacing_x(const css_length& mBorderSpacingX); + + const css_length& get_border_spacing_y() const; + void set_border_spacing_y(const css_length& mBorderSpacingY); + + caption_side get_caption_side() const; + void set_caption_side(caption_side side); + + float get_flex_grow() const; + float get_flex_shrink() const; + const css_length& get_flex_basis() const; + flex_direction get_flex_direction() const; + flex_wrap get_flex_wrap() const; + flex_justify_content get_flex_justify_content() const; + flex_align_items get_flex_align_items() const; + flex_align_items get_flex_align_self() const; + flex_align_content get_flex_align_content() const; + + int get_order() const; + void set_order(int order); + }; + + inline element_position css_properties::get_position() const + { + return m_el_position; + } + + inline void css_properties::set_position(element_position mElPosition) + { + m_el_position = mElPosition; + } + + inline text_align css_properties::get_text_align() const + { + return m_text_align; + } + + inline void css_properties::set_text_align(text_align mTextAlign) + { + m_text_align = mTextAlign; + } + + inline overflow css_properties::get_overflow() const + { + return m_overflow; + } + + inline void css_properties::set_overflow(overflow mOverflow) + { + m_overflow = mOverflow; + } + + inline white_space css_properties::get_white_space() const + { + return m_white_space; + } + + inline void css_properties::set_white_space(white_space mWhiteSpace) + { + m_white_space = mWhiteSpace; + } + + inline style_display css_properties::get_display() const + { + return m_display; + } + + inline void css_properties::set_display(style_display mDisplay) + { + m_display = mDisplay; + } + + inline visibility css_properties::get_visibility() const + { + return m_visibility; + } + + inline void css_properties::set_visibility(visibility mVisibility) + { + m_visibility = mVisibility; + } + + inline box_sizing css_properties::get_box_sizing() const + { + return m_box_sizing; + } + + inline void css_properties::set_box_sizing(box_sizing mBoxSizing) + { + m_box_sizing = mBoxSizing; + } + + inline int css_properties::get_z_index() const + { + return (int)m_z_index.val(); + } + + inline void css_properties::set_z_index(int mZIndex) + { + m_z_index.set_value((float)mZIndex, css_units_none); + } + + inline vertical_align css_properties::get_vertical_align() const + { + return m_vertical_align; + } + + inline void css_properties::set_vertical_align(vertical_align mVerticalAlign) + { + m_vertical_align = mVerticalAlign; + } + + inline element_float css_properties::get_float() const + { + return m_float; + } + + inline void css_properties::set_float(element_float mFloat) + { + m_float = mFloat; + } + + inline element_clear css_properties::get_clear() const + { + return m_clear; + } + + inline void css_properties::set_clear(element_clear mClear) + { + m_clear = mClear; + } + + inline const css_margins &css_properties::get_margins() const + { + return m_css_margins; + } + + inline void css_properties::set_margins(const css_margins &mCssMargins) + { + m_css_margins = mCssMargins; + } + + inline const css_margins &css_properties::get_padding() const + { + return m_css_padding; + } + + inline void css_properties::set_padding(const css_margins &mCssPadding) + { + m_css_padding = mCssPadding; + } + + inline const css_borders &css_properties::get_borders() const + { + return m_css_borders; + } + + inline void css_properties::set_borders(const css_borders &mCssBorders) + { + m_css_borders = mCssBorders; + } + + inline const css_length &css_properties::get_width() const + { + return m_css_width; + } + + inline void css_properties::set_width(const css_length &mCssWidth) + { + m_css_width = mCssWidth; + } + + inline const css_length &css_properties::get_height() const + { + return m_css_height; + } + + inline void css_properties::set_height(const css_length &mCssHeight) + { + m_css_height = mCssHeight; + } + + inline const css_length &css_properties::get_min_width() const + { + return m_css_min_width; + } + + inline void css_properties::set_min_width(const css_length &mCssMinWidth) + { + m_css_min_width = mCssMinWidth; + } + + inline const css_length &css_properties::get_min_height() const + { + return m_css_min_height; + } + + inline void css_properties::set_min_height(const css_length &mCssMinHeight) + { + m_css_min_height = mCssMinHeight; + } + + inline const css_length &css_properties::get_max_width() const + { + return m_css_max_width; + } + + inline void css_properties::set_max_width(const css_length &mCssMaxWidth) + { + m_css_max_width = mCssMaxWidth; + } + + inline const css_length &css_properties::get_max_height() const + { + return m_css_max_height; + } + + inline void css_properties::set_max_height(const css_length &mCssMaxHeight) + { + m_css_max_height = mCssMaxHeight; + } + + inline const css_offsets &css_properties::get_offsets() const + { + return m_css_offsets; + } + + inline void css_properties::set_offsets(const css_offsets &mCssOffsets) + { + m_css_offsets = mCssOffsets; + } + + inline const css_length &css_properties::get_text_indent() const + { + return m_css_text_indent; + } + + inline void css_properties::set_text_indent(const css_length &mCssTextIndent) + { + m_css_text_indent = mCssTextIndent; + } + + inline int css_properties::get_line_height() const + { + return m_line_height; + } + + inline void css_properties::set_line_height(int mLineHeight) + { + m_line_height = mLineHeight; + } + + inline list_style_type css_properties::get_list_style_type() const + { + return m_list_style_type; + } + + inline void css_properties::set_list_style_type(list_style_type mListStyleType) + { + m_list_style_type = mListStyleType; + } + + inline list_style_position css_properties::get_list_style_position() const + { + return m_list_style_position; + } + + inline void css_properties::set_list_style_position(list_style_position mListStylePosition) + { + m_list_style_position = mListStylePosition; + } + + inline string css_properties::get_list_style_image() const { return m_list_style_image; } + inline void css_properties::set_list_style_image(const string& url) { m_list_style_image = url; } + + inline string css_properties::get_list_style_image_baseurl() const { return m_list_style_image_baseurl; } + inline void css_properties::set_list_style_image_baseurl(const string& url) { m_list_style_image_baseurl = url; } + + inline const background &css_properties::get_bg() const + { + return m_bg; + } + + inline void css_properties::set_bg(const background &mBg) + { + m_bg = mBg; + } + + inline int css_properties::get_font_size() const + { + return (int)m_font_size.val(); + } + + inline void css_properties::set_font_size(int mFontSize) + { + m_font_size = (float)mFontSize; + } + + inline uint_ptr css_properties::get_font() const + { + return m_font; + } + + inline void css_properties::set_font(uint_ptr mFont) + { + m_font = mFont; + } + + inline const font_metrics& css_properties::get_font_metrics() const + { + return m_font_metrics; + } + + inline void css_properties::set_font_metrics(const font_metrics& mFontMetrics) + { + m_font_metrics = mFontMetrics; + } + + inline text_transform css_properties::get_text_transform() const + { + return m_text_transform; + } + + inline void css_properties::set_text_transform(text_transform mTextTransform) + { + m_text_transform = mTextTransform; + } + + inline web_color css_properties::get_color() const { return m_color; } + inline void css_properties::set_color(web_color color) { m_color = color; } + + inline string css_properties::get_cursor() const { return m_cursor; } + inline void css_properties::set_cursor(const string& cursor) { m_cursor = cursor; } + + inline string css_properties::get_content() const { return m_content; } + inline void css_properties::set_content(const string& content) { m_content = content; } + + inline border_collapse css_properties::get_border_collapse() const + { + return m_border_collapse; + } + + inline void css_properties::set_border_collapse(border_collapse mBorderCollapse) + { + m_border_collapse = mBorderCollapse; + } + + inline const css_length& css_properties::get_border_spacing_x() const + { + return m_css_border_spacing_x; + } + + inline void css_properties::set_border_spacing_x(const css_length& mBorderSpacingX) + { + m_css_border_spacing_x = mBorderSpacingX; + } + + inline const css_length& css_properties::get_border_spacing_y() const + { + return m_css_border_spacing_y; + } + + inline void css_properties::set_border_spacing_y(const css_length& mBorderSpacingY) + { + m_css_border_spacing_y = mBorderSpacingY; + } + + inline float css_properties::get_flex_grow() const + { + return m_flex_grow; + } + + inline float css_properties::get_flex_shrink() const + { + return m_flex_shrink; + } + + inline const css_length& css_properties::get_flex_basis() const + { + return m_flex_basis; + } + + inline flex_direction css_properties::get_flex_direction() const + { + return m_flex_direction; + } + + inline flex_wrap css_properties::get_flex_wrap() const + { + return m_flex_wrap; + } + + inline flex_justify_content css_properties::get_flex_justify_content() const + { + return m_flex_justify_content; + } + + inline flex_align_items css_properties::get_flex_align_items() const + { + return m_flex_align_items; + } + + inline flex_align_items css_properties::get_flex_align_self() const + { + return m_flex_align_self; + } + + inline flex_align_content css_properties::get_flex_align_content() const + { + return m_flex_align_content; + } + + inline caption_side css_properties::get_caption_side() const + { + return m_caption_side; + } + inline void css_properties::set_caption_side(caption_side side) + { + m_caption_side = side; + } + + inline int css_properties::get_order() const + { + return m_order; + } + + inline void css_properties::set_order(int order) + { + m_order = order; + } +} + +#endif //LITEHTML_CSS_PROPERTIES_H diff --git a/libs/litehtml/include/litehtml/css_selector.h b/libs/litehtml/include/litehtml/css_selector.h new file mode 100644 index 0000000000..4fe7db9e50 --- /dev/null +++ b/libs/litehtml/include/litehtml/css_selector.h @@ -0,0 +1,300 @@ +#ifndef LH_CSS_SELECTOR_H +#define LH_CSS_SELECTOR_H + +#include "style.h" +#include "media_query.h" + +namespace litehtml +{ + ////////////////////////////////////////////////////////////////////////// + + struct selector_specificity + { + int a; + int b; + int c; + int d; + + explicit selector_specificity(int va = 0, int vb = 0, int vc = 0, int vd = 0) + { + a = va; + b = vb; + c = vc; + d = vd; + } + + void operator += (const selector_specificity& val) + { + a += val.a; + b += val.b; + c += val.c; + d += val.d; + } + + bool operator==(const selector_specificity& val) const + { + if(a == val.a && b == val.b && c == val.c && d == val.d) + { + return true; + } + return false; + } + + bool operator!=(const selector_specificity& val) const + { + if(a != val.a || b != val.b || c != val.c || d != val.d) + { + return true; + } + return false; + } + + bool operator > (const selector_specificity& val) const + { + if(a > val.a) + { + return true; + } else if(a < val.a) + { + return false; + } else + { + if(b > val.b) + { + return true; + } else if(b < val.b) + { + return false; + } else + { + if(c > val.c) + { + return true; + } else if(c < val.c) + { + return false; + } else + { + if(d > val.d) + { + return true; + } else if(d < val.d) + { + return false; + } + } + } + } + return false; + } + + bool operator >= (const selector_specificity& val) const + { + if((*this) == val) return true; + if((*this) > val) return true; + return false; + } + + bool operator <= (const selector_specificity& val) const + { + if((*this) > val) + { + return false; + } + return true; + } + + bool operator < (const selector_specificity& val) const + { + if((*this) <= val && (*this) != val) + { + return true; + } + return false; + } + + }; + + ////////////////////////////////////////////////////////////////////////// + + enum attr_select_type + { + select_class, + select_id, + + select_exists, + select_equal, + select_contain_str, + select_start_str, + select_end_str, + + select_pseudo_class, + select_pseudo_element, + }; + + ////////////////////////////////////////////////////////////////////////// + + class css_element_selector; + + struct css_attribute_selector + { + typedef std::vector vector; + + attr_select_type type; + string_id name; // .name, #name, [name], :name + string val; // [name=val], :lang(val) + + std::shared_ptr sel; // :not(sel) + int a, b; // :nth-child(an+b) + + css_attribute_selector() + { + type = select_class; + name = empty_id; + a = b = 0; + } + }; + + ////////////////////////////////////////////////////////////////////////// + + class css_element_selector + { + public: + string_id m_tag; + css_attribute_selector::vector m_attrs; + public: + + void parse(const string& txt); + static void parse_nth_child_params(const string& param, int& num, int& off); + }; + + ////////////////////////////////////////////////////////////////////////// + + enum css_combinator + { + combinator_descendant, + combinator_child, + combinator_adjacent_sibling, + combinator_general_sibling + }; + + ////////////////////////////////////////////////////////////////////////// + + class css_selector + { + public: + typedef std::shared_ptr ptr; + typedef std::vector vector; + public: + selector_specificity m_specificity; + css_element_selector m_right; + css_selector::ptr m_left; + css_combinator m_combinator; + style::ptr m_style; + int m_order; + media_query_list::ptr m_media_query; + public: + explicit css_selector(const media_query_list::ptr& media = nullptr) + { + m_media_query = media; + m_combinator = combinator_descendant; + m_order = 0; + } + + ~css_selector() = default; + + css_selector(const css_selector& val) + { + m_right = val.m_right; + if(val.m_left) + { + m_left = std::make_shared(*val.m_left); + } else + { + m_left = nullptr; + } + m_combinator = val.m_combinator; + m_specificity = val.m_specificity; + m_order = val.m_order; + m_media_query = val.m_media_query; + } + + bool parse(const string& text); + void calc_specificity(); + bool is_media_valid() const; + void add_media_to_doc(document* doc) const; + }; + + inline bool css_selector::is_media_valid() const + { + if(!m_media_query) + { + return true; + } + return m_media_query->is_used(); + } + + + ////////////////////////////////////////////////////////////////////////// + + inline bool operator > (const css_selector& v1, const css_selector& v2) + { + if(v1.m_specificity == v2.m_specificity) + { + return (v1.m_order > v2.m_order); + } + return (v1.m_specificity > v2.m_specificity); + } + + inline bool operator < (const css_selector& v1, const css_selector& v2) + { + if(v1.m_specificity == v2.m_specificity) + { + return (v1.m_order < v2.m_order); + } + return (v1.m_specificity < v2.m_specificity); + } + + inline bool operator > (const css_selector::ptr& v1, const css_selector::ptr& v2) + { + return (*v1 > *v2); + } + + inline bool operator < (const css_selector::ptr& v1, const css_selector::ptr& v2) + { + return (*v1 < *v2); + } + + ////////////////////////////////////////////////////////////////////////// + + class used_selector + { + public: + typedef std::unique_ptr ptr; + typedef std::vector vector; + + css_selector::ptr m_selector; + bool m_used; + + used_selector(const css_selector::ptr& selector, bool used) + { + m_used = used; + m_selector = selector; + } + + used_selector(const used_selector& val) + { + m_used = val.m_used; + m_selector = val.m_selector; + } + + used_selector& operator=(const used_selector& val) + { + m_used = val.m_used; + m_selector = val.m_selector; + return *this; + } + }; +} + +#endif // LH_CSS_SELECTOR_H diff --git a/libs/litehtml/include/litehtml/document.h b/libs/litehtml/include/litehtml/document.h new file mode 100644 index 0000000000..e2623b2221 --- /dev/null +++ b/libs/litehtml/include/litehtml/document.h @@ -0,0 +1,134 @@ +#ifndef LH_DOCUMENT_H +#define LH_DOCUMENT_H + +#include "style.h" +#include "types.h" +#include "master_css.h" + +namespace litehtml +{ + struct css_text + { + typedef std::vector vector; + + string text; + string baseurl; + string media; + + css_text() = default; + + css_text(const char* txt, const char* url, const char* media_str) + { + text = txt ? txt : ""; + baseurl = url ? url : ""; + media = media_str ? media_str : ""; + } + + css_text(const css_text& val) + { + text = val.text; + baseurl = val.baseurl; + media = val.media; + } + }; + + class dumper + { + public: + virtual ~dumper() {} + virtual void begin_node(const litehtml::string& descr) = 0; + virtual void end_node() = 0; + virtual void begin_attrs_group(const litehtml::string& descr) = 0; + virtual void end_attrs_group() = 0; + virtual void add_attr(const litehtml::string& name, const litehtml::string& value) = 0; + }; + + class html_tag; + class render_item; + + class document : public std::enable_shared_from_this + { + public: + typedef std::shared_ptr ptr; + typedef std::weak_ptr weak_ptr; + private: + std::shared_ptr m_root; + std::shared_ptr m_root_render; + document_container* m_container; + fonts_map m_fonts; + css_text::vector m_css; + litehtml::css m_styles; + litehtml::web_color m_def_color; + litehtml::css m_master_css; + litehtml::css m_user_css; + litehtml::size m_size; + litehtml::size m_content_size; + position::vector m_fixed_boxes; + media_query_list::vector m_media_lists; + element::ptr m_over_element; + std::list> m_tabular_elements; + media_features m_media; + string m_lang; + string m_culture; + public: + document(document_container* objContainer); + virtual ~document(); + + document_container* container() { return m_container; } + uint_ptr get_font(const char* name, int size, const char* weight, const char* style, const char* decoration, font_metrics* fm); + int render(int max_width, render_type rt = render_all); + void draw(uint_ptr hdc, int x, int y, const position* clip); + web_color get_def_color() { return m_def_color; } + int to_pixels(const char* str, int fontSize, bool* is_percent = nullptr) const; + void cvt_units(css_length& val, int fontSize, int size = 0) const; + int to_pixels(const css_length& val, int fontSize, int size = 0) const; + int width() const; + int height() const; + int content_width() const; + int content_height() const; + void add_stylesheet(const char* str, const char* baseurl, const char* media); + bool on_mouse_over(int x, int y, int client_x, int client_y, position::vector& redraw_boxes); + bool on_lbutton_down(int x, int y, int client_x, int client_y, position::vector& redraw_boxes); + bool on_lbutton_up(int x, int y, int client_x, int client_y, position::vector& redraw_boxes); + bool on_mouse_leave(position::vector& redraw_boxes); + element::ptr create_element(const char* tag_name, const string_map& attributes); + element::ptr root(); + void get_fixed_boxes(position::vector& fixed_boxes); + void add_fixed_box(const position& pos); + void add_media_list(const media_query_list::ptr& list); + bool media_changed(); + bool lang_changed(); + bool match_lang(const string& lang); + void add_tabular(const std::shared_ptr& el); + element::const_ptr get_over_element() const { return m_over_element; } + + void append_children_from_string(element& parent, const char* str); + void dump(dumper& cout); + + static litehtml::document::ptr createFromString(const char* str, litehtml::document_container* objPainter, const char* master_styles = litehtml::master_css, const char* user_styles = ""); + + private: + uint_ptr add_font(const char* name, int size, const char* weight, const char* style, const char* decoration, font_metrics* fm); + + void create_node(void* gnode, elements_list& elements, bool parseTextNode); + bool update_media_lists(const media_features& features); + void fix_tables_layout(); + void fix_table_children(const std::shared_ptr& el_ptr, style_display disp, const char* disp_str); + void fix_table_parent(const std::shared_ptr & el_ptr, style_display disp, const char* disp_str); + }; + + inline element::ptr document::root() + { + return m_root; + } + inline void document::add_tabular(const std::shared_ptr& el) + { + m_tabular_elements.push_back(el); + } + inline bool document::match_lang(const string& lang) + { + return lang == m_lang || lang == m_culture; + } +} + +#endif // LH_DOCUMENT_H diff --git a/libs/litehtml/include/litehtml/document_container.h b/libs/litehtml/include/litehtml/document_container.h new file mode 100644 index 0000000000..391873c1ab --- /dev/null +++ b/libs/litehtml/include/litehtml/document_container.h @@ -0,0 +1,71 @@ +#ifndef LH_DOCUMENT_CONTAINER_H +#define LH_DOCUMENT_CONTAINER_H + +#include "os_types.h" +#include "types.h" +#include "web_color.h" +#include "background.h" +#include "borders.h" +#include "element.h" +#include +#include + +namespace litehtml +{ + struct list_marker + { + string image; + const char* baseurl; + list_style_type marker_type; + web_color color; + position pos; + int index; + uint_ptr font; + }; + + // call back interface to draw text, images and other elements + class document_container + { + public: + virtual litehtml::uint_ptr create_font(const char* faceName, int size, int weight, litehtml::font_style italic, unsigned int decoration, litehtml::font_metrics* fm) = 0; + virtual void delete_font(litehtml::uint_ptr hFont) = 0; + virtual int text_width(const char* text, litehtml::uint_ptr hFont) = 0; + virtual void draw_text(litehtml::uint_ptr hdc, const char* text, litehtml::uint_ptr hFont, litehtml::web_color color, const litehtml::position& pos) = 0; + virtual int pt_to_px(int pt) const = 0; + virtual int get_default_font_size() const = 0; + virtual const char* get_default_font_name() const = 0; + virtual void draw_list_marker(litehtml::uint_ptr hdc, const litehtml::list_marker& marker) = 0; + virtual void load_image(const char* src, const char* baseurl, bool redraw_on_ready) = 0; + virtual void get_image_size(const char* src, const char* baseurl, litehtml::size& sz) = 0; + // Note: regular images are also drawn with draw_background + // bg is guaranteed to have at least one item. + // backgrounds in bg are in CSS order - the last one is the farthest from the user. + // only the last background has valid background-color. + virtual void draw_background(litehtml::uint_ptr hdc, const std::vector& bg) = 0; + virtual void draw_borders(litehtml::uint_ptr hdc, const litehtml::borders& borders, const litehtml::position& draw_pos, bool root) = 0; + + virtual void set_caption(const char* caption) = 0; + virtual void set_base_url(const char* base_url) = 0; + virtual void link(const std::shared_ptr& doc, const litehtml::element::ptr& el) = 0; + virtual void on_anchor_click(const char* url, const litehtml::element::ptr& el) = 0; + virtual void set_cursor(const char* cursor) = 0; + virtual void transform_text(litehtml::string& text, litehtml::text_transform tt) = 0; + virtual void import_css(litehtml::string& text, const litehtml::string& url, litehtml::string& baseurl) = 0; + virtual void set_clip(const litehtml::position& pos, const litehtml::border_radiuses& bdr_radius) = 0; + virtual void del_clip() = 0; + virtual void get_client_rect(litehtml::position& client) const = 0; + virtual litehtml::element::ptr create_element( const char* tag_name, + const litehtml::string_map& attributes, + const std::shared_ptr& doc) = 0; + + virtual void get_media_features(litehtml::media_features& media) const = 0; + virtual void get_language(litehtml::string& language, litehtml::string& culture) const = 0; + virtual litehtml::string resolve_color(const litehtml::string& /*color*/) const { return litehtml::string(); } + virtual void split_text(const char* text, const std::function& on_word, const std::function& on_space); + + protected: + ~document_container() = default; + }; +} + +#endif // LH_DOCUMENT_CONTAINER_H diff --git a/libs/litehtml/include/litehtml/el_anchor.h b/libs/litehtml/include/litehtml/el_anchor.h new file mode 100644 index 0000000000..b33794c52f --- /dev/null +++ b/libs/litehtml/include/litehtml/el_anchor.h @@ -0,0 +1,18 @@ +#ifndef LH_EL_ANCHOR_H +#define LH_EL_ANCHOR_H + +#include "html_tag.h" + +namespace litehtml +{ + class el_anchor : public html_tag + { + public: + explicit el_anchor(const std::shared_ptr& doc); + + void on_click() override; + void apply_stylesheet(const litehtml::css& stylesheet) override; + }; +} + +#endif // LH_EL_ANCHOR_H diff --git a/libs/litehtml/include/litehtml/el_base.h b/libs/litehtml/include/litehtml/el_base.h new file mode 100644 index 0000000000..d7efb80649 --- /dev/null +++ b/libs/litehtml/include/litehtml/el_base.h @@ -0,0 +1,17 @@ +#ifndef LH_EL_BASE_H +#define LH_EL_BASE_H + +#include "html_tag.h" + +namespace litehtml +{ + class el_base : public html_tag + { + public: + explicit el_base(const std::shared_ptr& doc); + + void parse_attributes() override; + }; +} + +#endif // LH_EL_BASE_H diff --git a/libs/litehtml/include/litehtml/el_before_after.h b/libs/litehtml/include/litehtml/el_before_after.h new file mode 100644 index 0000000000..eed5f3dad7 --- /dev/null +++ b/libs/litehtml/include/litehtml/el_before_after.h @@ -0,0 +1,39 @@ +#ifndef LH_EL_BEFORE_AFTER_H +#define LH_EL_BEFORE_AFTER_H + +#include "html_tag.h" + +namespace litehtml +{ + class el_before_after_base : public html_tag + { + public: + el_before_after_base(const std::shared_ptr& doc, bool before); + + void add_style(const style& style) override; + private: + void add_text(const string& txt); + void add_function(const string& fnc, const string& params); + static string convert_escape(const char* txt); + }; + + class el_before : public el_before_after_base + { + public: + explicit el_before(const std::shared_ptr& doc) : el_before_after_base(doc, true) + { + + } + }; + + class el_after : public el_before_after_base + { + public: + explicit el_after(const std::shared_ptr& doc) : el_before_after_base(doc, false) + { + + } + }; +} + +#endif // LH_EL_BEFORE_AFTER_H diff --git a/libs/litehtml/include/litehtml/el_body.h b/libs/litehtml/include/litehtml/el_body.h new file mode 100644 index 0000000000..fb30e0c513 --- /dev/null +++ b/libs/litehtml/include/litehtml/el_body.h @@ -0,0 +1,17 @@ +#ifndef LH_EL_BODY_H +#define LH_EL_BODY_H + +#include "html_tag.h" + +namespace litehtml +{ + class el_body : public html_tag + { + public: + explicit el_body(const std::shared_ptr& doc); + + bool is_body() const override; + }; +} + +#endif // LH_EL_BODY_H diff --git a/libs/litehtml/include/litehtml/el_break.h b/libs/litehtml/include/litehtml/el_break.h new file mode 100644 index 0000000000..2a4d8fe45b --- /dev/null +++ b/libs/litehtml/include/litehtml/el_break.h @@ -0,0 +1,17 @@ +#ifndef LH_EL_BREAK_H +#define LH_EL_BREAK_H + +#include "html_tag.h" + +namespace litehtml +{ + class el_break : public html_tag + { + public: + explicit el_break(const std::shared_ptr& doc); + + bool is_break() const override; + }; +} + +#endif // LH_EL_BREAK_H diff --git a/libs/litehtml/include/litehtml/el_cdata.h b/libs/litehtml/include/litehtml/el_cdata.h new file mode 100644 index 0000000000..838cd92b1e --- /dev/null +++ b/libs/litehtml/include/litehtml/el_cdata.h @@ -0,0 +1,19 @@ +#ifndef LH_EL_CDATA_H +#define LH_EL_CDATA_H + +#include "html_tag.h" + +namespace litehtml +{ + class el_cdata : public element + { + string m_text; + public: + explicit el_cdata(const std::shared_ptr& doc); + + void get_text(string& text) override; + void set_data(const char* data) override; + }; +} + +#endif // LH_EL_CDATA_H diff --git a/libs/litehtml/include/litehtml/el_comment.h b/libs/litehtml/include/litehtml/el_comment.h new file mode 100644 index 0000000000..746238e9aa --- /dev/null +++ b/libs/litehtml/include/litehtml/el_comment.h @@ -0,0 +1,25 @@ +#ifndef LH_EL_COMMENT_H +#define LH_EL_COMMENT_H + +#include "html_tag.h" + +namespace litehtml +{ + class el_comment : public element + { + string m_text; + public: + explicit el_comment(const std::shared_ptr& doc); + + bool is_comment() const override; + void get_text(string& text) override; + void set_data(const char* data) override; + std::shared_ptr create_render_item(const std::shared_ptr& /*parent_ri*/) override + { + // Comments are not rendered + return nullptr; + } + }; +} + +#endif // LH_EL_COMMENT_H diff --git a/libs/litehtml/include/litehtml/el_div.h b/libs/litehtml/include/litehtml/el_div.h new file mode 100644 index 0000000000..a2d031a32f --- /dev/null +++ b/libs/litehtml/include/litehtml/el_div.h @@ -0,0 +1,17 @@ +#ifndef LH_EL_DIV_H +#define LH_EL_DIV_H + +#include "html_tag.h" + +namespace litehtml +{ + class el_div : public html_tag + { + public: + explicit el_div(const std::shared_ptr& doc); + + void parse_attributes() override; + }; +} + +#endif // LH_EL_DIV_H diff --git a/libs/litehtml/include/litehtml/el_font.h b/libs/litehtml/include/litehtml/el_font.h new file mode 100644 index 0000000000..ccb8945124 --- /dev/null +++ b/libs/litehtml/include/litehtml/el_font.h @@ -0,0 +1,17 @@ +#ifndef LH_EL_FONT_H +#define LH_EL_FONT_H + +#include "html_tag.h" + +namespace litehtml +{ + class el_font : public html_tag + { + public: + explicit el_font(const std::shared_ptr& doc); + + void parse_attributes() override; + }; +} + +#endif // LH_EL_FONT_H diff --git a/libs/litehtml/include/litehtml/el_image.h b/libs/litehtml/include/litehtml/el_image.h new file mode 100644 index 0000000000..2b73940815 --- /dev/null +++ b/libs/litehtml/include/litehtml/el_image.h @@ -0,0 +1,29 @@ +#ifndef LH_EL_IMAGE_H +#define LH_EL_IMAGE_H + +#include "html_tag.h" + +namespace litehtml +{ + + class el_image : public html_tag + { + string m_src; + public: + el_image(const document::ptr& doc); + + bool is_replaced() const override; + void parse_attributes() override; + void compute_styles(bool recursive = true) override; + void draw(uint_ptr hdc, int x, int y, const position *clip, const std::shared_ptr &ri) override; + void get_content_size(size& sz, int max_width) override; + string dump_get_name() override; + + std::shared_ptr create_render_item(const std::shared_ptr& parent_ri) override; + + private: +// int calc_max_height(int image_height); + }; +} + +#endif // LH_EL_IMAGE_H diff --git a/libs/litehtml/include/litehtml/el_link.h b/libs/litehtml/include/litehtml/el_link.h new file mode 100644 index 0000000000..0da3513dcd --- /dev/null +++ b/libs/litehtml/include/litehtml/el_link.h @@ -0,0 +1,18 @@ +#ifndef LH_EL_LINK_H +#define LH_EL_LINK_H + +#include "html_tag.h" + +namespace litehtml +{ + class el_link : public html_tag + { + public: + explicit el_link(const std::shared_ptr& doc); + + protected: + void parse_attributes() override; + }; +} + +#endif // LH_EL_LINK_H diff --git a/libs/litehtml/include/litehtml/el_para.h b/libs/litehtml/include/litehtml/el_para.h new file mode 100644 index 0000000000..32ad537581 --- /dev/null +++ b/libs/litehtml/include/litehtml/el_para.h @@ -0,0 +1,18 @@ +#ifndef LH_EL_PARA_H +#define LH_EL_PARA_H + +#include "html_tag.h" + +namespace litehtml +{ + class el_para : public html_tag + { + public: + explicit el_para(const std::shared_ptr& doc); + + void parse_attributes() override; + + }; +} + +#endif // LH_EL_PARA_H diff --git a/libs/litehtml/include/litehtml/el_script.h b/libs/litehtml/include/litehtml/el_script.h new file mode 100644 index 0000000000..e0a0374057 --- /dev/null +++ b/libs/litehtml/include/litehtml/el_script.h @@ -0,0 +1,21 @@ +#ifndef LH_EL_SCRIPT_H +#define LH_EL_SCRIPT_H + +#include "html_tag.h" + +namespace litehtml +{ + class el_script : public element + { + string m_text; + public: + explicit el_script(const std::shared_ptr& doc); + + void parse_attributes() override; + bool appendChild(const ptr &el) override; + string_id tag() const override; + const char* get_tagName() const override; + }; +} + +#endif // LH_EL_SCRIPT_H diff --git a/libs/litehtml/include/litehtml/el_space.h b/libs/litehtml/include/litehtml/el_space.h new file mode 100644 index 0000000000..46a292ebcb --- /dev/null +++ b/libs/litehtml/include/litehtml/el_space.h @@ -0,0 +1,21 @@ +#ifndef LH_EL_SPACE_H +#define LH_EL_SPACE_H + +#include "html_tag.h" +#include "el_text.h" + +namespace litehtml +{ + class el_space : public el_text + { + public: + el_space(const char* text, const std::shared_ptr& doc); + + bool is_white_space() const override; + bool is_break() const override; + bool is_space() const override; + string dump_get_name() override; + }; +} + +#endif // LH_EL_SPACE_H diff --git a/libs/litehtml/include/litehtml/el_style.h b/libs/litehtml/include/litehtml/el_style.h new file mode 100644 index 0000000000..62f1546259 --- /dev/null +++ b/libs/litehtml/include/litehtml/el_style.h @@ -0,0 +1,21 @@ +#ifndef LH_EL_STYLE_H +#define LH_EL_STYLE_H + +#include "html_tag.h" + +namespace litehtml +{ + class el_style : public element + { + elements_list m_children; + public: + explicit el_style(const std::shared_ptr& doc); + + void parse_attributes() override; + bool appendChild(const ptr &el) override; + string_id tag() const override; + const char* get_tagName() const override; + }; +} + +#endif // LH_EL_STYLE_H diff --git a/libs/litehtml/include/litehtml/el_table.h b/libs/litehtml/include/litehtml/el_table.h new file mode 100644 index 0000000000..38352503bf --- /dev/null +++ b/libs/litehtml/include/litehtml/el_table.h @@ -0,0 +1,25 @@ +#ifndef LH_EL_TABLE_H +#define LH_EL_TABLE_H + +#include "html_tag.h" + +namespace litehtml +{ + struct col_info + { + int width; + bool is_auto; + }; + + + class el_table : public html_tag + { + public: + explicit el_table(const std::shared_ptr& doc); + + bool appendChild(const litehtml::element::ptr& el) override; + void parse_attributes() override; + }; +} + +#endif // LH_EL_TABLE_H diff --git a/libs/litehtml/include/litehtml/el_td.h b/libs/litehtml/include/litehtml/el_td.h new file mode 100644 index 0000000000..03d21c1c77 --- /dev/null +++ b/libs/litehtml/include/litehtml/el_td.h @@ -0,0 +1,17 @@ +#ifndef LH_EL_TD_H +#define LH_EL_TD_H + +#include "html_tag.h" + +namespace litehtml +{ + class el_td : public html_tag + { + public: + explicit el_td(const std::shared_ptr& doc); + + void parse_attributes() override; + }; +} + +#endif // LH_EL_TD_H diff --git a/libs/litehtml/include/litehtml/el_text.h b/libs/litehtml/include/litehtml/el_text.h new file mode 100644 index 0000000000..4b8a442f38 --- /dev/null +++ b/libs/litehtml/include/litehtml/el_text.h @@ -0,0 +1,31 @@ +#ifndef LH_EL_TEXT_H +#define LH_EL_TEXT_H + +#include "html_tag.h" + +namespace litehtml +{ + class el_text : public element + { + protected: + string m_text; + string m_transformed_text; + size m_size; + bool m_use_transformed; + bool m_draw_spaces; + public: + el_text(const char* text, const document::ptr& doc); + + void get_text(string& text) override; + void compute_styles(bool recursive) override; + bool is_text() const override { return true; } + + void draw(uint_ptr hdc, int x, int y, const position *clip, const std::shared_ptr &ri) override; + string dump_get_name() override; + std::vector> dump_get_attrs() override; + protected: + void get_content_size(size& sz, int max_width) override; + }; +} + +#endif // LH_EL_TEXT_H diff --git a/libs/litehtml/include/litehtml/el_title.h b/libs/litehtml/include/litehtml/el_title.h new file mode 100644 index 0000000000..201186a4a0 --- /dev/null +++ b/libs/litehtml/include/litehtml/el_title.h @@ -0,0 +1,18 @@ +#ifndef LH_EL_TITLE_H +#define LH_EL_TITLE_H + +#include "html_tag.h" + +namespace litehtml +{ + class el_title : public html_tag + { + public: + explicit el_title(const std::shared_ptr& doc); + + protected: + void parse_attributes() override; + }; +} + +#endif // LH_EL_TITLE_H diff --git a/libs/litehtml/include/litehtml/el_tr.h b/libs/litehtml/include/litehtml/el_tr.h new file mode 100644 index 0000000000..49c0b9a9b2 --- /dev/null +++ b/libs/litehtml/include/litehtml/el_tr.h @@ -0,0 +1,17 @@ +#ifndef LH_EL_TR_H +#define LH_EL_TR_H + +#include "html_tag.h" + +namespace litehtml +{ + class el_tr : public html_tag + { + public: + explicit el_tr(const std::shared_ptr& doc); + + void parse_attributes() override; + }; +} + +#endif // LH_EL_TR_H diff --git a/libs/litehtml/include/litehtml/element.h b/libs/litehtml/include/litehtml/element.h new file mode 100644 index 0000000000..4d244736ba --- /dev/null +++ b/libs/litehtml/include/litehtml/element.h @@ -0,0 +1,234 @@ +#ifndef LH_ELEMENT_H +#define LH_ELEMENT_H + +#include +#include +#include +#include "stylesheet.h" +#include "css_offsets.h" +#include "css_margins.h" +#include "css_properties.h" + +namespace litehtml +{ + class line_box; + class dumper; + class render_item; + + class element : public std::enable_shared_from_this + { + friend class line_box; + friend class html_tag; + friend class el_table; + friend class document; + public: + typedef std::shared_ptr ptr; + typedef std::shared_ptr const_ptr; + typedef std::weak_ptr weak_ptr; + protected: + std::weak_ptr m_parent; + std::weak_ptr m_doc; + elements_list m_children; + css_properties m_css; + std::list> m_renders; + used_selector::vector m_used_styles; + + virtual void select_all(const css_selector& selector, elements_list& res); + element::ptr _add_before_after(int type, const style& style); + + private: + std::map m_counter_values; + + public: + explicit element(const std::shared_ptr& doc); + virtual ~element() = default; + + const css_properties& css() const; + css_properties& css_w(); + + bool in_normal_flow() const; + bool is_inline() const; // returns true if element is inline + bool is_inline_box() const; // returns true if element is inline box (inline-table, inline-box, inline-flex) + bool is_block_box() const; + position get_placement() const; + bool is_positioned() const; + bool is_float() const; + bool is_block_formatting_context() const; + + bool is_root() const; + element::ptr parent() const; + void parent(const element::ptr& par); + // returns true for elements inside a table (but outside cells) that don't participate in table rendering + bool is_table_skip() const; + + std::shared_ptr get_document() const; + const std::list>& children() const; + + virtual elements_list select_all(const string& selector); + virtual elements_list select_all(const css_selector& selector); + + virtual element::ptr select_one(const string& selector); + virtual element::ptr select_one(const css_selector& selector); + + virtual bool appendChild(const ptr &el); + virtual bool removeChild(const ptr &el); + virtual void clearRecursive(); + + virtual string_id id() const; + virtual string_id tag() const; + virtual const char* get_tagName() const; + virtual void set_tagName(const char* tag); + virtual void set_data(const char* data); + + virtual void set_attr(const char* name, const char* val); + virtual const char* get_attr(const char* name, const char* def = nullptr) const; + virtual void apply_stylesheet(const litehtml::css& stylesheet); + virtual void refresh_styles(); + virtual bool is_white_space() const; + virtual bool is_space() const; + virtual bool is_comment() const; + virtual bool is_body() const; + virtual bool is_break() const; + virtual bool is_text() const; + + virtual bool on_mouse_over(); + virtual bool on_mouse_leave(); + virtual bool on_lbutton_down(); + virtual bool on_lbutton_up(); + virtual void on_click(); + virtual bool set_pseudo_class(string_id cls, bool add); + virtual bool set_class(const char* pclass, bool add); + virtual bool is_replaced() const; + virtual void compute_styles(bool recursive = true); + virtual void draw(uint_ptr hdc, int x, int y, const position *clip, const std::shared_ptr& ri); + virtual void draw_background(uint_ptr hdc, int x, int y, const position *clip, const std::shared_ptr &ri); + virtual int get_enum_property (string_id name, bool inherited, int default_value, uint_ptr css_properties_member_offset) const; + virtual int get_int_property (string_id name, bool inherited, int default_value, uint_ptr css_properties_member_offset) const; + virtual css_length get_length_property(string_id name, bool inherited, css_length default_value, uint_ptr css_properties_member_offset) const; + virtual web_color get_color_property (string_id name, bool inherited, web_color default_value, uint_ptr css_properties_member_offset) const; + virtual string get_string_property(string_id name, bool inherited, const string& default_value, uint_ptr css_properties_member_offset) const; + virtual float get_number_property(string_id name, bool inherited, float default_value, uint_ptr css_properties_member_offset) const; + virtual string_vector get_string_vector_property(string_id name, bool inherited, const string_vector& default_value, uint_ptr css_properties_member_offset) const; + virtual int_vector get_int_vector_property (string_id name, bool inherited, const int_vector& default_value, uint_ptr css_properties_member_offset) const; + virtual length_vector get_length_vector_property(string_id name, bool inherited, const length_vector& default_value, uint_ptr css_properties_member_offset) const; + virtual size_vector get_size_vector_property (string_id name, bool inherited, const size_vector& default_value, uint_ptr css_properties_member_offset) const; + virtual string get_custom_property(string_id name, const string& default_value) const; + + virtual void get_text(string& text); + virtual void parse_attributes(); + virtual int select(const string& selector); + virtual int select(const css_selector& selector, bool apply_pseudo = true); + virtual int select(const css_element_selector& selector, bool apply_pseudo = true); + virtual element::ptr find_ancestor(const css_selector& selector, bool apply_pseudo = true, bool* is_pseudo = nullptr); + virtual bool is_ancestor(const ptr &el) const; + virtual element::ptr find_adjacent_sibling(const element::ptr& el, const css_selector& selector, bool apply_pseudo = true, bool* is_pseudo = nullptr); + virtual element::ptr find_sibling(const element::ptr& el, const css_selector& selector, bool apply_pseudo = true, bool* is_pseudo = nullptr); + virtual void get_content_size(size& sz, int max_width); + virtual bool is_nth_child(const element::ptr& el, int num, int off, bool of_type) const; + virtual bool is_nth_last_child(const element::ptr& el, int num, int off, bool of_type) const; + virtual bool is_only_child(const element::ptr& el, bool of_type) const; + virtual void add_style(const style& style); + virtual const background* get_background(bool own_only = false); + + virtual string dump_get_name(); + virtual std::vector> dump_get_attrs(); + void dump(litehtml::dumper& cout); + + std::tuple split_inlines(); + virtual std::shared_ptr create_render_item(const std::shared_ptr& parent_ri); + bool requires_styles_update(); + void add_render(const std::shared_ptr& ri); + bool find_styles_changes( position::vector& redraw_boxes); + element::ptr add_pseudo_before(const style& style) + { + return _add_before_after(0, style); + } + element::ptr add_pseudo_after(const style& style) + { + return _add_before_after(1, style); + } + + string get_counter_value(const string& counter_name); + string get_counters_value(const string_vector& parameters); + void increment_counter(const string_id& counter_name_id, const int increment = 1); + void reset_counter(const string_id& counter_name_id, const int value = 0); + + private: + std::vector get_siblings_before() const; + bool find_counter(const string_id& counter_name_id, std::map::iterator& map_iterator); + void parse_counter_tokens(const string_vector& tokens, const int default_value, std::function handler) const; + }; + + ////////////////////////////////////////////////////////////////////////// + // INLINE FUNCTIONS // + ////////////////////////////////////////////////////////////////////////// + + inline bool litehtml::element::in_normal_flow() const + { + if(css().get_position() != element_position_absolute && css().get_display() != display_none) + { + return true; + } + return false; + } + + inline bool litehtml::element::is_root() const + { + return m_parent.expired(); + } + + inline element::ptr litehtml::element::parent() const + { + return m_parent.lock(); + } + + inline void litehtml::element::parent(const element::ptr& par) + { + m_parent = par; + } + + inline bool litehtml::element::is_positioned() const + { + return (css().get_position() > element_position_static); + } + + inline bool litehtml::element::is_float() const + { + return (css().get_float() != float_none); + } + + inline std::shared_ptr element::get_document() const + { + return m_doc.lock(); + } + + inline const css_properties& element::css() const + { + return m_css; + } + + inline css_properties& element::css_w() + { + return m_css; + } + + inline bool element::is_block_box() const + { + if (css().get_display() == display_block || + css().get_display() == display_flex || + css().get_display() == display_table || + css().get_display() == display_list_item || + css().get_display() == display_flex) + { + return true; + } + return false; + } + + inline const std::list>& element::children() const + { + return m_children; + } +} + +#endif // LH_ELEMENT_H diff --git a/libs/litehtml/include/litehtml/flex_item.h b/libs/litehtml/include/litehtml/flex_item.h new file mode 100644 index 0000000000..0c4244ae2d --- /dev/null +++ b/libs/litehtml/include/litehtml/flex_item.h @@ -0,0 +1,137 @@ +#ifndef LITEHTML_FLEX_ITEM_H +#define LITEHTML_FLEX_ITEM_H + +#include +#include "formatting_context.h" + +namespace litehtml +{ + class flex_line; + + /** + * Base class for flex item + */ + class flex_item + { + public: + std::shared_ptr el; + int base_size; + int min_size; + def_value max_size; + int main_size; + int grow; + int shrink; + int scaled_flex_shrink_factor; + bool frozen; + int order; + int src_order; + def_value auto_margin_main_start; + def_value auto_margin_main_end; + bool auto_margin_cross_start; + bool auto_margin_cross_end; + flex_align_items align; + + explicit flex_item(std::shared_ptr &_el) : + el(_el), + base_size(0), + min_size(0), + max_size(0), + main_size(0), + grow(0), + shrink(0), + scaled_flex_shrink_factor(0), + frozen(false), + order(0), + src_order(0), + auto_margin_main_start(0), + auto_margin_main_end(0), + auto_margin_cross_start(false), + auto_margin_cross_end(false), + align(flex_align_items_auto) + {} + + virtual ~flex_item() = default; + + bool operator<(const flex_item& b) const + { + if(order < b.order) return true; + if(order == b.order) return src_order < b.src_order; + return false; + } + void init(const litehtml::containing_block_context &self_size, + litehtml::formatting_context *fmt_ctx, flex_align_items align_items); + virtual void apply_main_auto_margins() = 0; + virtual bool apply_cross_auto_margins(int cross_size) = 0; + virtual void set_main_position(int pos) = 0; + virtual void set_cross_position(int pos) = 0; + virtual int get_el_main_size() = 0; + virtual int get_el_cross_size() = 0; + + void place(flex_line &ln, int main_pos, + const containing_block_context &self_size, + formatting_context *fmt_ctx); + int get_last_baseline(baseline::_baseline_type type) const; + int get_first_baseline(baseline::_baseline_type type) const; + + protected: + virtual void direction_specific_init(const litehtml::containing_block_context &self_size, + litehtml::formatting_context *fmt_ctx) = 0; + virtual void align_stretch(flex_line &ln, const containing_block_context &self_size, + formatting_context *fmt_ctx) = 0; + virtual void align_baseline(flex_line &ln, + const containing_block_context &self_size, + formatting_context *fmt_ctx) = 0; + }; + + /** + * Flex item with "flex-direction: row" or " flex-direction: row-reverse" + */ + class flex_item_row_direction : public flex_item + { + public: + explicit flex_item_row_direction(std::shared_ptr &_el) : flex_item(_el) {} + + void apply_main_auto_margins() override; + bool apply_cross_auto_margins(int cross_size) override; + void set_main_position(int pos) override; + void set_cross_position(int pos) override; + int get_el_main_size() override; + int get_el_cross_size() override; + + protected: + void direction_specific_init(const litehtml::containing_block_context &self_size, + litehtml::formatting_context *fmt_ctx) override; + void align_stretch(flex_line &ln, const containing_block_context &self_size, + formatting_context *fmt_ctx) override; + void align_baseline(flex_line &ln, + const containing_block_context &self_size, + formatting_context *fmt_ctx) override; + }; + + /** + * Flex item with "flex-direction: column" or " flex-direction: column-reverse" + */ + class flex_item_column_direction : public flex_item + { + public: + explicit flex_item_column_direction(std::shared_ptr &_el) : flex_item(_el) {} + + void apply_main_auto_margins() override; + bool apply_cross_auto_margins(int cross_size) override; + void set_main_position(int pos) override; + void set_cross_position(int pos) override; + int get_el_main_size() override; + int get_el_cross_size() override; + + protected: + void direction_specific_init(const litehtml::containing_block_context &self_size, + litehtml::formatting_context *fmt_ctx) override; + void align_stretch(flex_line &ln, const containing_block_context &self_size, + formatting_context *fmt_ctx) override; + void align_baseline(flex_line &ln, + const containing_block_context &self_size, + formatting_context *fmt_ctx) override; + }; +} + +#endif //LITEHTML_FLEX_ITEM_H diff --git a/libs/litehtml/include/litehtml/flex_line.h b/libs/litehtml/include/litehtml/flex_line.h new file mode 100644 index 0000000000..c96df86bb5 --- /dev/null +++ b/libs/litehtml/include/litehtml/flex_line.h @@ -0,0 +1,56 @@ +#ifndef LITEHTML_FLEX_LINE_H +#define LITEHTML_FLEX_LINE_H + +#include "formatting_context.h" + +namespace litehtml +{ + class flex_item; + + class flex_line + { + public: + std::list> items; + int cross_start; // for row direction: top. for column direction: left + int main_size; // sum of all items main size + int cross_size; // sum of all items cross size + int base_size; + int total_grow; + int total_shrink; + int num_auto_margin_main_start; // number of items with auto margin left/top + int num_auto_margin_main_end; // number of items with auto margin right/bottom + baseline first_baseline; + baseline last_baseline; + bool reverse_main; + bool reverse_cross; + + flex_line(bool _reverse_main, bool _reverse_cross) : + cross_start(0), + main_size(0), + cross_size(0), + base_size(0), + total_grow(0), + total_shrink(0), + num_auto_margin_main_start(0), + num_auto_margin_main_end(0), + first_baseline(), + last_baseline(), + reverse_main(_reverse_main), + reverse_cross(_reverse_cross) + {} + + void init(int container_main_size, bool fit_container, bool is_row_direction, + const litehtml::containing_block_context &self_size, + litehtml::formatting_context *fmt_ctx); + bool distribute_main_auto_margins(int free_main_size); + int calculate_items_position(int container_main_size, + flex_justify_content justify_content, + bool is_row_direction, + const containing_block_context &self_size, + formatting_context *fmt_ctx); + protected: + void distribute_free_space(int container_main_size); + }; +} + +#endif //LITEHTML_FLEX_LINE_H diff --git a/libs/litehtml/include/litehtml/formatting_context.h b/libs/litehtml/include/litehtml/formatting_context.h new file mode 100644 index 0000000000..eee481dc46 --- /dev/null +++ b/libs/litehtml/include/litehtml/formatting_context.h @@ -0,0 +1,54 @@ +#ifndef LITEHTML_FLOATS_HOLDER_H +#define LITEHTML_FLOATS_HOLDER_H + +#include +#include "types.h" + +namespace litehtml +{ + class formatting_context + { + private: + std::list m_floats_left; + std::list m_floats_right; + int_int_cache m_cache_line_left; + int_int_cache m_cache_line_right; + int m_current_top; + int m_current_left; + + public: + formatting_context() : m_current_top(0), m_current_left(0) {} + + void push_position(int x, int y) + { + m_current_left += x; + m_current_top += y; + } + void pop_position(int x, int y) + { + m_current_left -= x; + m_current_top -= y; + } + + void add_float(const std::shared_ptr &el, int min_width, int context); + void clear_floats(int context); + int find_next_line_top( int top, int width, int def_right ); + int get_floats_height(element_float el_float = float_none) const; + int get_left_floats_height() const; + int get_right_floats_height() const; + int get_line_left( int y ); + void get_line_left_right( int y, int def_right, int& ln_left, int& ln_right ) + { + ln_left = get_line_left(y); + ln_right = get_line_right(y, def_right); + } + int get_line_right( int y, int def_right ); + int get_cleared_top(const std::shared_ptr &el, int line_top) const; + void update_floats(int dy, const std::shared_ptr &parent); + void apply_relative_shift(const containing_block_context &containing_block_size); + int find_min_left(int y, int context_idx); + int find_min_right(int y, int right, int context_idx); + }; +} + +#endif //LITEHTML_FLOATS_HOLDER_H diff --git a/libs/litehtml/include/litehtml/html.h b/libs/litehtml/include/litehtml/html.h new file mode 100644 index 0000000000..818d5ce565 --- /dev/null +++ b/libs/litehtml/include/litehtml/html.h @@ -0,0 +1,88 @@ +#ifndef LH_HTML_H +#define LH_HTML_H + +#include +#include +#include +#include +#include +#include +#include +#include +#include "os_types.h" +#include "string_id.h" +#include "types.h" +#include "utf8_strings.h" +#include "background.h" +#include "borders.h" +#include "web_color.h" +#include "media_query.h" +#include "html_tag.h" +#include "document_container.h" +#include "document.h" + +namespace litehtml +{ + void trim(string &s, const string& chars_to_trim = " \n\r\t"); + void lcase(string &s); + int value_index(const string& val, const string& strings, int defValue = -1, char delim = ';'); + string index_value(int index, const string& strings, char delim = ';'); + bool value_in_list(const string& val, const string& strings, char delim = ';'); + string::size_type find_close_bracket(const string &s, string::size_type off, char open_b = '(', char close_b = ')'); + void split_string(const string& str, string_vector& tokens, const string& delims, const string& delims_preserve = "", const string& quote = "\""); + void join_string(string& str, const string_vector& tokens, const string& delims); + double t_strtod(const char* string, char** endPtr = nullptr); + string get_escaped_string(const string& in_str); + + int t_strcasecmp(const char *s1, const char *s2); + int t_strncasecmp(const char *s1, const char *s2, size_t n); + + bool is_number(const string& string, const bool allow_dot = 1); + + inline int t_isdigit(int c) + { + return (c >= '0' && c <= '9'); + } + + inline int t_isalpha(int c) + { + return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'); + } + + inline int t_tolower(int c) + { + return (c >= 'A' && c <= 'Z' ? c + 'a' - 'A' : c); + } + + inline int round_f(float val) + { + int int_val = (int) val; + if(val - int_val >= 0.5) + { + int_val++; + } + return int_val; + } + + inline int round_d(double val) + { + int int_val = (int) val; + if(val - int_val >= 0.5) + { + int_val++; + } + return int_val; + } + + inline float t_strtof(const string& str, char** endPtr = nullptr) + { + return (float)t_strtod(str.c_str(), endPtr); + } + + inline int baseline_align(int line_height, int line_base_line, int height, int baseline) + { + return (line_height - line_base_line) - (height - baseline); + } +} + +#endif // LH_HTML_H diff --git a/libs/litehtml/include/litehtml/html_tag.h b/libs/litehtml/include/litehtml/html_tag.h new file mode 100644 index 0000000000..b085d7dfb2 --- /dev/null +++ b/libs/litehtml/include/litehtml/html_tag.h @@ -0,0 +1,139 @@ +#ifndef LH_HTML_TAG_H +#define LH_HTML_TAG_H + +#include "element.h" +#include "style.h" +#include "background.h" +#include "css_margins.h" +#include "borders.h" +#include "css_selector.h" +#include "stylesheet.h" +#include "line_box.h" +#include "table.h" + +namespace litehtml +{ + + class html_tag : public element + { + friend class elements_iterator; + friend class el_table; + friend class table_grid; + friend class line_box; + public: + typedef std::shared_ptr ptr; + protected: + string_id m_tag; + string_id m_id; + string_vector m_str_classes; + std::vector m_classes; + litehtml::style m_style; + string_map m_attrs; + std::vector m_pseudo_classes; + + void select_all(const css_selector& selector, elements_list& res) override; + + public: + explicit html_tag(const std::shared_ptr& doc); + // constructor for anonymous wrapper boxes + explicit html_tag(const element::ptr& parent, const string& style = "display: block"); + + bool appendChild(const element::ptr &el) override; + bool removeChild(const element::ptr &el) override; + void clearRecursive() override; + string_id tag() const override; + string_id id() const override; + const char* get_tagName() const override; + void set_tagName(const char* tag) override; + void set_data(const char* data) override; + + void set_attr(const char* name, const char* val) override; + const char* get_attr(const char* name, const char* def = nullptr) const override; + void apply_stylesheet(const litehtml::css& stylesheet) override; + void refresh_styles() override; + + bool is_white_space() const override; + bool is_body() const override; + bool is_break() const override; + + bool on_mouse_over() override; + bool on_mouse_leave() override; + bool on_lbutton_down() override; + bool on_lbutton_up() override; + void on_click() override; + bool set_pseudo_class(string_id cls, bool add) override; + bool set_class(const char* pclass, bool add) override; + bool is_replaced() const override; + void compute_styles(bool recursive = true) override; + void draw(uint_ptr hdc, int x, int y, const position *clip, const std::shared_ptr &ri) override; + void draw_background(uint_ptr hdc, int x, int y, const position *clip, + const std::shared_ptr &ri) override; + + template + const Type& get_property_impl (string_id name, bool inherited, const Type& default_value, uint_ptr css_properties_member_offset) const; + int get_enum_property (string_id name, bool inherited, int default_value, uint_ptr css_properties_member_offset) const override; + int get_int_property (string_id name, bool inherited, int default_value, uint_ptr css_properties_member_offset) const override; + css_length get_length_property(string_id name, bool inherited, css_length default_value, uint_ptr css_properties_member_offset) const override; + web_color get_color_property (string_id name, bool inherited, web_color default_value, uint_ptr css_properties_member_offset) const override; + string get_string_property(string_id name, bool inherited, const string& default_value, uint_ptr css_properties_member_offset) const override; + float get_number_property(string_id name, bool inherited, float default_value, uint_ptr css_properties_member_offset) const override; + string_vector get_string_vector_property(string_id name, bool inherited, const string_vector& default_value, uint_ptr css_properties_member_offset) const override; + int_vector get_int_vector_property (string_id name, bool inherited, const int_vector& default_value, uint_ptr css_properties_member_offset) const override; + length_vector get_length_vector_property(string_id name, bool inherited, const length_vector& default_value, uint_ptr css_properties_member_offset) const override; + size_vector get_size_vector_property (string_id name, bool inherited, const size_vector& default_value, uint_ptr css_properties_member_offset) const override; + string get_custom_property(string_id name, const string& default_value) const override; + + elements_list& children(); + + int select(const string& selector) override; + int select(const css_selector& selector, bool apply_pseudo = true) override; + int select(const css_element_selector& selector, bool apply_pseudo = true) override; + int select_pseudoclass(const css_attribute_selector& sel); + int select_attribute(const css_attribute_selector& sel); + + elements_list select_all(const string& selector) override; + elements_list select_all(const css_selector& selector) override; + + element::ptr select_one(const string& selector) override; + element::ptr select_one(const css_selector& selector) override; + + element::ptr find_ancestor(const css_selector& selector, bool apply_pseudo = true, bool* is_pseudo = nullptr) override; + element::ptr find_adjacent_sibling(const element::ptr& el, const css_selector& selector, bool apply_pseudo = true, bool* is_pseudo = nullptr) override; + element::ptr find_sibling(const element::ptr& el, const css_selector& selector, bool apply_pseudo = true, bool* is_pseudo = nullptr) override; + void get_text(string& text) override; + void parse_attributes() override; + + void get_content_size(size& sz, int max_width) override; + void add_style(const style& style) override; + + bool is_nth_child(const element::ptr& el, int num, int off, bool of_type) const override; + bool is_nth_last_child(const element::ptr& el, int num, int off, bool of_type) const override; + bool is_only_child(const element::ptr& el, bool of_type) const override; + const background* get_background(bool own_only = false) override; + + string dump_get_name() override; + + protected: + void init_background_paint(position pos, std::vector& bg_paint, const background* bg, const std::shared_ptr& ri); + void init_one_background_paint(int i, position pos, background_paint& bg_paint, const background* bg, const std::shared_ptr& ri); + void draw_list_marker( uint_ptr hdc, const position &pos ); + string get_list_marker_text(int index); + element::ptr get_element_before(const style& style, bool create); + element::ptr get_element_after(const style& style, bool create); + + private: + void handle_counter_properties(); + + }; + + /************************************************************************/ + /* Inline Functions */ + /************************************************************************/ + + inline elements_list& litehtml::html_tag::children() + { + return m_children; + } +} + +#endif // LH_HTML_TAG_H diff --git a/libs/litehtml/include/litehtml/iterators.h b/libs/litehtml/include/litehtml/iterators.h new file mode 100644 index 0000000000..b1a678d7b4 --- /dev/null +++ b/libs/litehtml/include/litehtml/iterators.h @@ -0,0 +1,84 @@ +#ifndef LH_ITERATORS_H +#define LH_ITERATORS_H + +#include "types.h" +#include +#include + +namespace litehtml +{ + class render_item; + + class iterator_selector + { + public: + virtual bool select(const std::shared_ptr& el) = 0; + + protected: + ~iterator_selector() = default; + }; + + enum iterator_item_type + { + iterator_item_type_child, + iterator_item_type_start_parent, + iterator_item_type_end_parent + }; + + class elements_iterator + { + private: + iterator_selector* m_go_inside; + iterator_selector* m_select; + bool m_return_parent; + + /** + * Checks if iterator should go inside the element + * + * @param el element to check + * @return true to go inside + */ + bool go_inside(const std::shared_ptr& el); + + public: + elements_iterator(bool return_parents, iterator_selector* go_inside, iterator_selector* select); + ~elements_iterator() = default; + + void process(const std::shared_ptr& container, const std::function&, iterator_item_type)>& func); + + private: + void next_idx(); + }; + + class go_inside_inline final : public iterator_selector + { + public: + bool select(const std::shared_ptr& el) override; + }; + + class inline_selector final : public iterator_selector + { + public: + bool select(const std::shared_ptr& el) override; + }; + + class go_inside_table final : public iterator_selector + { + public: + bool select(const std::shared_ptr& el) override; + }; + + class table_rows_selector final : public iterator_selector + { + public: + bool select(const std::shared_ptr& el) override; + }; + + class table_cells_selector final : public iterator_selector + { + public: + bool select(const std::shared_ptr& el) override; + }; +} + +#endif // LH_ITERATORS_H diff --git a/libs/litehtml/include/litehtml/line_box.h b/libs/litehtml/include/litehtml/line_box.h new file mode 100644 index 0000000000..a1e4969c96 --- /dev/null +++ b/libs/litehtml/include/litehtml/line_box.h @@ -0,0 +1,171 @@ +#ifndef LH_LINE_BOX_H +#define LH_LINE_BOX_H + +#include +#include +#include "os_types.h" +#include "types.h" + +namespace litehtml +{ + class render_item; + + struct line_context + { + int calculatedTop; + int top; + int left; + int right; + + int width() const + { + return right - left; + } + void fix_top() + { + calculatedTop = top; + } + line_context() : calculatedTop(0), top(0), left(0), right(0) {} + }; + + class line_box_item + { + public: + enum element_type + { + type_text_part, + type_inline_start, + type_inline_continue, + type_inline_end + }; + protected: + std::shared_ptr m_element; + int m_rendered_min_width; + public: + explicit line_box_item(const std::shared_ptr& element) : m_element(element), m_rendered_min_width(0) {} + line_box_item() : m_element(), m_rendered_min_width(0) {}; + line_box_item(const line_box_item& el) = default; + line_box_item(line_box_item&&) = default; + + int height() const { return right() - left(); } + const std::shared_ptr& get_el() const { return m_element; } + virtual position& pos(); + virtual void place_to(int x, int y); + virtual int width() const; + virtual int top() const; + virtual int bottom() const; + virtual int right() const; + virtual int left() const; + virtual element_type get_type() const { return type_text_part; } + virtual int get_rendered_min_width() const { return m_rendered_min_width; } + virtual void set_rendered_min_width(int min_width) { m_rendered_min_width = min_width; } + }; + + class lbi_start : public line_box_item + { + protected: + position m_pos; + public: + explicit lbi_start(const std::shared_ptr& element); + + void place_to(int x, int y) override; + int width() const override; + position& pos() override { return m_pos; } + int top() const override; + int bottom() const override; + int right() const override; + int left() const override; + element_type get_type() const override { return type_inline_start; } + int get_rendered_min_width() const override { return width(); } + }; + + class lbi_end : public lbi_start + { + public: + explicit lbi_end(const std::shared_ptr& element); + + void place_to(int x, int y) override; + int right() const override; + int left() const override; + element_type get_type() const override { return type_inline_end; } + }; + + class lbi_continue : public lbi_start + { + public: + explicit lbi_continue(const std::shared_ptr& element); + + void place_to(int x, int y) override; + int right() const override; + int left() const override; + int width() const override; + element_type get_type() const override { return type_inline_continue; } + }; + + class line_box + { + struct va_context + { + int baseline; + font_metrics fm; + + va_context() : baseline(0) {} + }; + + int m_top; + int m_left; + int m_right; + int m_height; + int m_width; + int m_line_height; + int m_default_line_height; + font_metrics m_font_metrics; + int m_baseline; + text_align m_text_align; + int m_min_width; + std::list< std::unique_ptr > m_items; + public: + line_box(int top, int left, int right, int line_height, const font_metrics& fm, text_align align) : + m_top(top), + m_left(left), + m_right(right), + m_height(0), + m_width(0), + m_line_height(0), + m_default_line_height(line_height), + m_font_metrics(fm), + m_baseline(0), + m_text_align(align), + m_min_width(0) + { + } + + int bottom() const { return m_top + height(); } + int top() const { return m_top; } + int right() const { return m_left + width(); } + int left() const { return m_left; } + int height() const { return m_height; } + int width() const { return m_width; } + int line_right() const { return m_right; } + int min_width() const { return m_min_width; } + + void add_item(std::unique_ptr item); + bool can_hold(const std::unique_ptr& item, white_space ws) const; + bool is_empty() const; + int baseline() const; + int top_margin() const; + int bottom_margin() const; + void y_shift(int shift); + std::list< std::unique_ptr > finish(bool last_box, const containing_block_context &containing_block_size); + std::list< std::unique_ptr > new_width(int left, int right); + std::shared_ptr get_last_text_part() const; + std::shared_ptr get_first_text_part() const; + std::list< std::unique_ptr >& items() { return m_items; } + private: + bool have_last_space() const; + bool is_break_only() const; + static int calc_va_baseline(const va_context& current, vertical_align va, const font_metrics& new_font, int top, int bottom); + }; +} + +#endif //LH_LINE_BOX_H diff --git a/libs/litehtml/include/litehtml/master_css.h b/libs/litehtml/include/litehtml/master_css.h new file mode 100644 index 0000000000..0e7b0ca4e3 --- /dev/null +++ b/libs/litehtml/include/litehtml/master_css.h @@ -0,0 +1,376 @@ +#ifndef LH_MASTER_CSS_H +#define LH_MASTER_CSS_H +namespace litehtml{ const char* const master_css = R"##( + + +html { + display: block; + position: relative; +} + +head { + display: none +} + +meta { + display: none +} + +title { + display: none +} + +link { + display: none +} + +style { + display: none +} + +script { + display: none +} + +body { + display:block; + margin:8px; +} + +p { + display:block; + margin-top:1em; + margin-bottom:1em; +} + +b, strong { + display:inline; + font-weight:bold; +} + +i, em, cite { + display:inline; + font-style:italic; +} + +ins, u { + text-decoration:underline +} + +del, s, strike { + text-decoration:line-through +} + +center +{ + text-align:center; + display:block; +} + +a:link +{ + text-decoration: underline; + color: #00f; + cursor: pointer; +} + +h1, h2, h3, h4, h5, h6, div { + display:block; +} + +h1 { + font-weight:bold; + margin-top:0.67em; + margin-bottom:0.67em; + font-size: 2em; +} + +h2 { + font-weight:bold; + margin-top:0.83em; + margin-bottom:0.83em; + font-size: 1.5em; +} + +h3 { + font-weight:bold; + margin-top:1em; + margin-bottom:1em; + font-size:1.17em; +} + +h4 { + font-weight:bold; + margin-top:1.33em; + margin-bottom:1.33em +} + +h5 { + font-weight:bold; + margin-top:1.67em; + margin-bottom:1.67em; + font-size:.83em; +} + +h6 { + font-weight:bold; + margin-top:2.33em; + margin-bottom:2.33em; + font-size:.67em; +} + +br { + display:inline-block; +} + +br[clear="all"] +{ + clear:both; +} + +br[clear="left"] +{ + clear:left; +} + +br[clear="right"] +{ + clear:right; +} + +span { + display:inline +} + +img { + display: inline-block; +} + +img[align="right"] +{ + float: right; +} + +img[align="left"] +{ + float: left; +} + +hr { + display: block; + margin-top: 0.5em; + margin-bottom: 0.5em; + margin-left: auto; + margin-right: auto; + border-style: inset; + border-width: 1px +} + + +/***************** TABLES ********************/ + +table { + display: table; + border-collapse: separate; + border-spacing: 2px; + border-top-color:gray; + border-left-color:gray; + border-bottom-color:black; + border-right-color:black; + font-size: medium; + font-weight: normal; + font-style: normal; +} + +tbody, tfoot, thead { + display:table-row-group; + vertical-align:middle; +} + +tr { + display: table-row; + vertical-align: inherit; + border-color: inherit; +} + +td, th { + display: table-cell; + vertical-align: inherit; + border-width:1px; + padding:1px; +} + +th { + font-weight: bold; +} + +table[border] { + border-style:solid; +} + +table[border|=0] { + border-style:none; +} + +table[border] td, table[border] th { + border-style:solid; + border-top-color:black; + border-left-color:black; + border-bottom-color:gray; + border-right-color:gray; +} + +table[border|=0] td, table[border|=0] th { + border-style:none; +} + +table[align=left] { + float: left; +} + +table[align=right] { + float: right; +} + +table[align=center] { + margin-left: auto; + margin-right: auto; +} + +caption { + display: table-caption; +} + +td[nowrap], th[nowrap] { + white-space:nowrap; +} + +tt, code, kbd, samp { + font-family: monospace +} + +pre, xmp, plaintext, listing { + display: block; + font-family: monospace; + white-space: pre; + margin: 1em 0 +} + +/***************** LISTS ********************/ + +ul, menu, dir { + display: block; + list-style-type: disc; + margin-top: 1em; + margin-bottom: 1em; + margin-left: 0; + margin-right: 0; + padding-left: 40px +} + +ol { + display: block; + list-style-type: decimal; + margin-top: 1em; + margin-bottom: 1em; + margin-left: 0; + margin-right: 0; + padding-left: 40px +} + +li { + display: list-item; +} + +ul ul, ol ul { + list-style-type: circle; +} + +ol ol ul, ol ul ul, ul ol ul, ul ul ul { + list-style-type: square; +} + +dd { + display: block; + margin-left: 40px; +} + +dl { + display: block; + margin-top: 1em; + margin-bottom: 1em; + margin-left: 0; + margin-right: 0; +} + +dt { + display: block; +} + +ol ul, ul ol, ul ul, ol ol { + margin-top: 0; + margin-bottom: 0 +} + +blockquote { + display: block; + margin-top: 1em; + margin-bottom: 1em; + margin-left: 40px; + margin-right: 40px; +} + +/*********** FORM ELEMENTS ************/ + +form { + display: block; + margin-top: 0em; +} + +option { + display: none; +} + +input, textarea, keygen, select, button, isindex { + margin: 0em; + color: initial; + line-height: normal; + text-transform: none; + text-indent: 0; + text-shadow: none; + display: inline-block; +} +input[type="hidden"] { + display: none; +} + + +article, aside, footer, header, hgroup, nav, section +{ + display: block; +} + +sub { + vertical-align: sub; + font-size: smaller; +} + +sup { + vertical-align: super; + font-size: smaller; +} + +figure { + display: block; + margin-top: 1em; + margin-bottom: 1em; + margin-left: 40px; + margin-right: 40px; +} + +figcaption { + display: block; +} + +)##"; } +#endif // LH_MASTER_CSS_H diff --git a/libs/litehtml/include/litehtml/media_query.h b/libs/litehtml/include/litehtml/media_query.h new file mode 100644 index 0000000000..4cb21fc2f6 --- /dev/null +++ b/libs/litehtml/include/litehtml/media_query.h @@ -0,0 +1,77 @@ +#ifndef LH_MEDIA_QUERY_H +#define LH_MEDIA_QUERY_H + +namespace litehtml +{ + struct media_query_expression + { + typedef std::vector vector; + media_feature feature; + int val; + int val2; + bool check_as_bool; + + media_query_expression() + { + check_as_bool = false; + feature = media_feature_none; + val = 0; + val2 = 0; + } + + bool check(const media_features& features) const; + }; + + class media_query + { + public: + typedef std::shared_ptr ptr; + typedef std::vector vector; + private: + media_query_expression::vector m_expressions; + bool m_not; + media_type m_media_type; + public: + media_query(); + media_query(const media_query& val); + + static media_query::ptr create_from_string(const string& str, const std::shared_ptr& doc); + bool check(const media_features& features) const; + }; + + class media_query_list + { + public: + typedef std::shared_ptr ptr; + typedef std::vector vector; + private: + media_query::vector m_queries; + bool m_is_used; + public: + media_query_list(); + media_query_list(const media_query_list& val); + + static media_query_list::ptr create_from_string(const string& str, const std::shared_ptr& doc); + bool is_used() const; + bool apply_media_features(const media_features& features); // returns true if the m_is_used changed + }; + + inline media_query_list::media_query_list(const media_query_list& val) + { + m_is_used = val.m_is_used; + m_queries = val.m_queries; + } + + inline media_query_list::media_query_list() + { + m_is_used = false; + } + + inline bool media_query_list::is_used() const + { + return m_is_used; + } + +} + +#endif // LH_MEDIA_QUERY_H diff --git a/libs/litehtml/include/litehtml/num_cvt.h b/libs/litehtml/include/litehtml/num_cvt.h new file mode 100644 index 0000000000..0eaaa68868 --- /dev/null +++ b/libs/litehtml/include/litehtml/num_cvt.h @@ -0,0 +1,19 @@ +#ifndef NUM_CVT_H +#define NUM_CVT_H + +#include +#include "os_types.h" + +namespace litehtml +{ + namespace num_cvt + { + string to_latin_lower(int val); + string to_latin_upper(int val); + string to_greek_lower(int val); + string to_roman_lower(int value); + string to_roman_upper(int value); + } +} + +#endif // NUM_CVT_H \ No newline at end of file diff --git a/libs/litehtml/include/litehtml/os_types.h b/libs/litehtml/include/litehtml/os_types.h new file mode 100644 index 0000000000..bbc2c3cf63 --- /dev/null +++ b/libs/litehtml/include/litehtml/os_types.h @@ -0,0 +1,30 @@ +#ifndef LH_OS_TYPES_H +#define LH_OS_TYPES_H + +#include +#include + +namespace litehtml +{ + using std::string; + typedef std::uintptr_t uint_ptr; + +#if defined( WIN32 ) || defined( _WIN32 ) || defined( WINCE ) + +// noexcept appeared since Visual Studio 2015 +#if defined(_MSC_VER) && _MSC_VER < 1900 +#define noexcept +#endif + + #define t_itoa(value, buffer, size, radix) _itoa_s(value, buffer, size, radix) + #define t_snprintf(s, n, format, ...) _snprintf_s(s, _TRUNCATE, n, format, __VA_ARGS__) + +#else + + #define t_itoa(value, buffer, size, radix) snprintf(buffer, size, "%d", value) + #define t_snprintf(s, n, format, ...) snprintf(s, n, format, __VA_ARGS__) + +#endif +} + +#endif // LH_OS_TYPES_H diff --git a/libs/litehtml/include/litehtml/render_block.h b/libs/litehtml/include/litehtml/render_block.h new file mode 100644 index 0000000000..1874be3324 --- /dev/null +++ b/libs/litehtml/include/litehtml/render_block.h @@ -0,0 +1,40 @@ +#ifndef LITEHTML_RENDER_BLOCK_H +#define LITEHTML_RENDER_BLOCK_H + +#include "render_item.h" + +namespace litehtml +{ + class render_item_block : public render_item + { + protected: + /** + * Render block content. + * + * @param x - horizontal position of the content + * @param y - vertical position of the content + * @param second_pass - true is this is the second pass. + * @param ret_width - input minimal width. + * @param self_size - defines calculated size of block + * @return return value is the minimal width of the content in block. Must be greater or equal to ret_width parameter + */ + virtual int _render_content(int /*x*/, int /*y*/, bool /*second_pass*/, const containing_block_context &/*self_size*/, formatting_context* /*fmt_ctx*/) {return 0;} + int _render(int x, int y, const containing_block_context &containing_block_size, formatting_context* fmt_ctx, bool second_pass) override; + int place_float(const std::shared_ptr &el, int top, const containing_block_context &self_size, formatting_context* fmt_ctx); + virtual void fix_line_width(element_float /*flt*/, + const containing_block_context &/*containing_block_size*/, formatting_context* /*fmt_ctx*/) + {} + + public: + explicit render_item_block(std::shared_ptr src_el) : render_item(std::move(src_el)) + {} + + std::shared_ptr clone() override + { + return std::make_shared(src_el()); + } + std::shared_ptr init() override; + }; +} + +#endif //LITEHTML_RENDER_BLOCK_H diff --git a/libs/litehtml/include/litehtml/render_block_context.h b/libs/litehtml/include/litehtml/render_block_context.h new file mode 100644 index 0000000000..c69389832c --- /dev/null +++ b/libs/litehtml/include/litehtml/render_block_context.h @@ -0,0 +1,31 @@ +#ifndef LITEHTML_RENDER_BLOCK_CONTEXT_H +#define LITEHTML_RENDER_BLOCK_CONTEXT_H + +#include "render_block.h" + +namespace litehtml +{ + /** + * In a block formatting context, boxes are laid out one after the other, vertically, beginning at the top of a + * containing block. + * https://www.w3.org/TR/CSS22/visuren.html#block-formatting + */ + class render_item_block_context : public render_item_block + { + protected: + int _render_content(int x, int y, bool second_pass, const containing_block_context &self_size, formatting_context* fmt_ctx) override; + + public: + explicit render_item_block_context(std::shared_ptr src_el) : render_item_block(std::move(src_el)) + {} + + std::shared_ptr clone() override + { + return std::make_shared(src_el()); + } + int get_first_baseline() override; + int get_last_baseline() override; + }; +} + +#endif //LITEHTML_RENDER_BLOCK_CONTEXT_H diff --git a/libs/litehtml/include/litehtml/render_flex.h b/libs/litehtml/include/litehtml/render_flex.h new file mode 100644 index 0000000000..6a03b98ece --- /dev/null +++ b/libs/litehtml/include/litehtml/render_flex.h @@ -0,0 +1,33 @@ +#ifndef LITEHTML_RENDER_FLEX_H +#define LITEHTML_RENDER_FLEX_H + +#include "render_block.h" +#include "flex_item.h" +#include "flex_line.h" + +namespace litehtml +{ + class render_item_flex : public render_item_block + { + std::list m_lines; + + std::list get_lines(const containing_block_context &self_size, formatting_context *fmt_ctx, bool is_row_direction, + int container_main_size, bool single_line); + int _render_content(int x, int y, bool second_pass, const containing_block_context &self_size, formatting_context* fmt_ctx) override; + + public: + explicit render_item_flex(std::shared_ptr src_el) : render_item_block(std::move(src_el)) + {} + + std::shared_ptr clone() override + { + return std::make_shared(src_el()); + } + std::shared_ptr init() override; + + int get_first_baseline() override; + int get_last_baseline() override; + }; +} + +#endif //LITEHTML_RENDER_FLEX_H diff --git a/libs/litehtml/include/litehtml/render_image.h b/libs/litehtml/include/litehtml/render_image.h new file mode 100644 index 0000000000..e85f487caf --- /dev/null +++ b/libs/litehtml/include/litehtml/render_image.h @@ -0,0 +1,25 @@ +#ifndef LITEHTML_RENDER_IMAGE_H +#define LITEHTML_RENDER_IMAGE_H + +#include "render_item.h" + +namespace litehtml +{ + class render_item_image : public render_item + { + protected: + int calc_max_height(int image_height, int containing_block_height); + int _render(int x, int y, const containing_block_context &containing_block_size, formatting_context* fmt_ctx, bool second_pass) override; + + public: + explicit render_item_image(std::shared_ptr src_el) : render_item(std::move(src_el)) + {} + + std::shared_ptr clone() override + { + return std::make_shared(src_el()); + } + }; +} + +#endif //LITEHTML_RENDER_IMAGE_H diff --git a/libs/litehtml/include/litehtml/render_inline.h b/libs/litehtml/include/litehtml/render_inline.h new file mode 100644 index 0000000000..666074b90c --- /dev/null +++ b/libs/litehtml/include/litehtml/render_inline.h @@ -0,0 +1,38 @@ +#ifndef LITEHTML_RENDER_INLINE_H +#define LITEHTML_RENDER_INLINE_H + +#include "render_item.h" + +namespace litehtml +{ + class render_item_inline : public render_item + { + protected: + position::vector m_boxes; + + public: + explicit render_item_inline(std::shared_ptr src_el) : render_item(std::move(src_el)) + {} + + void get_inline_boxes( position::vector& boxes ) const override { boxes = m_boxes; } + void set_inline_boxes( position::vector& boxes ) override { m_boxes = boxes; } + void add_inline_box( const position& box ) override { m_boxes.emplace_back(box); }; + void clear_inline_boxes() override { m_boxes.clear(); } + int get_first_baseline() override + { + return src_el()->css().get_font_metrics().height - src_el()->css().get_font_metrics().base_line(); + } + int get_last_baseline() override + { + return src_el()->css().get_font_metrics().height - src_el()->css().get_font_metrics().base_line(); + } + + std::shared_ptr clone() override + { + return std::make_shared(src_el()); + } + }; +} + +#endif //LITEHTML_RENDER_INLINE_H + diff --git a/libs/litehtml/include/litehtml/render_inline_context.h b/libs/litehtml/include/litehtml/render_inline_context.h new file mode 100644 index 0000000000..7d629bc7ff --- /dev/null +++ b/libs/litehtml/include/litehtml/render_inline_context.h @@ -0,0 +1,56 @@ +#ifndef LITEHTML_RENDER_INLINE_CONTEXT_H +#define LITEHTML_RENDER_INLINE_CONTEXT_H + +#include "render_block.h" + +namespace litehtml +{ + /** + * An inline formatting context is established by a block container box that contains no block-level boxes. + * https://www.w3.org/TR/CSS22/visuren.html#inline-formatting + */ + class render_item_inline_context : public render_item_block + { + /** + * Structure contains elements with display: inline + * members: + * - element: render_item with display: inline + * - boxes: rectangles represented inline element content. There are can be many boxes if content + * is split into some lines + * - start_box: the start position of currently calculated box + */ + struct inlines_item + { + std::shared_ptr element; + position::vector boxes; + position start_box; + + explicit inlines_item(const std::shared_ptr& el) : element(el) {} + }; + protected: + std::vector > m_line_boxes; + int m_max_line_width; + + int _render_content(int x, int y, bool second_pass, const containing_block_context &self_size, formatting_context* fmt_ctx) override; + void fix_line_width(element_float flt, + const containing_block_context &self_size, formatting_context* fmt_ctx) override; + + std::list > finish_last_box(bool end_of_render, const containing_block_context &self_size); + void place_inline(std::unique_ptr item, const containing_block_context &self_size, formatting_context* fmt_ctx); + int new_box(const std::unique_ptr& el, line_context& line_ctx, const containing_block_context &self_size, formatting_context* fmt_ctx); + void apply_vertical_align() override; + public: + explicit render_item_inline_context(std::shared_ptr src_el) : render_item_block(std::move(src_el)), m_max_line_width(0) + {} + + std::shared_ptr clone() override + { + return std::make_shared(src_el()); + } + + int get_first_baseline() override; + int get_last_baseline() override; + }; +} + +#endif //LITEHTML_RENDER_INLINE_CONTEXT_H diff --git a/libs/litehtml/include/litehtml/render_item.h b/libs/litehtml/include/litehtml/render_item.h new file mode 100644 index 0000000000..8ee3077676 --- /dev/null +++ b/libs/litehtml/include/litehtml/render_item.h @@ -0,0 +1,387 @@ +#ifndef LH_RENDER_ITEM_H +#define LH_RENDER_ITEM_H + +#include +#include +#include +#include +#include "types.h" +#include "line_box.h" +#include "table.h" +#include "formatting_context.h" + +namespace litehtml +{ + class element; + + class render_item : public std::enable_shared_from_this + { + protected: + std::shared_ptr m_element; + std::weak_ptr m_parent; + std::list> m_children; + margins m_margins; + margins m_padding; + margins m_borders; + position m_pos; + bool m_skip; + std::vector> m_positioned; + + containing_block_context calculate_containing_block_context(const containing_block_context& cb_context); + void calc_cb_length(const css_length& len, int percent_base, containing_block_context::typed_int& out_value) const; + virtual int _render(int /*x*/, int /*y*/, const containing_block_context& /*containing_block_size*/, formatting_context* /*fmt_ctx*/, bool /*second_pass = false*/) + { + return 0; + } + + public: + explicit render_item(std::shared_ptr src_el); + + virtual ~render_item() = default; + + std::list>& children() + { + return m_children; + } + + position& pos() + { + return m_pos; + } + + bool skip() const + { + return m_skip; + } + + void skip(bool val) + { + m_skip = val; + } + + int right() const + { + return left() + width(); + } + + int left() const + { + return m_pos.left() - m_margins.left - m_padding.left - m_borders.left; + } + + int top() const + { + return m_pos.top() - m_margins.top - m_padding.top - m_borders.top; + } + + int bottom() const + { + return top() + height(); + } + + int height() const + { + return m_pos.height + m_margins.height() + m_padding.height() + m_borders.height(); + } + + int width() const + { + return m_pos.width + m_margins.width() + m_padding.width() + m_borders.width(); + } + + int padding_top() const + { + return m_padding.top; + } + + int padding_bottom() const + { + return m_padding.bottom; + } + + int padding_left() const + { + return m_padding.left; + } + + int padding_right() const + { + return m_padding.right; + } + + int border_top() const + { + return m_borders.top; + } + + int border_bottom() const + { + return m_borders.bottom; + } + + int border_left() const + { + return m_borders.left; + } + + int border_right() const + { + return m_borders.right; + } + + int margin_top() const + { + return m_margins.top; + } + + int margin_bottom() const + { + return m_margins.bottom; + } + + int margin_left() const + { + return m_margins.left; + } + + int margin_right() const + { + return m_margins.right; + } + + std::shared_ptr parent() const + { + return m_parent.lock(); + } + + margins& get_margins() + { + return m_margins; + } + + margins& get_paddings() + { + return m_padding; + } + + void set_paddings(const margins& val) + { + m_padding = val; + } + + margins& get_borders() + { + return m_borders; + } + + /** + * Top offset to the element content. Includes paddings, margins and borders. + */ + int content_offset_top() const + { + return m_margins.top + m_padding.top + m_borders.top; + } + + /** + * Bottom offset to the element content. Includes paddings, margins and borders. + */ + inline int content_offset_bottom() const + { + return m_margins.bottom + m_padding.bottom + m_borders.bottom; + } + + /** + * Left offset to the element content. Includes paddings, margins and borders. + */ + int content_offset_left() const + { + return m_margins.left + m_padding.left + m_borders.left; + } + + /** + * Right offset to the element content. Includes paddings, margins and borders. + */ + int content_offset_right() const + { + return m_margins.right + m_padding.right + m_borders.right; + } + + /** + * Sum of left and right offsets to the element content. Includes paddings, margins and borders. + */ + int content_offset_width() const + { + return content_offset_left() + content_offset_right(); + } + + /** + * Sum of top and bottom offsets to the element content. Includes paddings, margins and borders. + */ + int content_offset_height() const + { + return content_offset_top() + content_offset_bottom(); + } + + int box_sizing_left() const + { + if(css().get_box_sizing() == box_sizing_border_box) + { + return m_padding.left + m_borders.left; + } + return 0; + } + + int box_sizing_right() const + { + if(css().get_box_sizing() == box_sizing_border_box) + { + return m_padding.right + m_borders.right; + } + return 0; + } + + int box_sizing_width() const + { + return box_sizing_left() + box_sizing_right(); + } + + int box_sizing_top() const + { + if(css().get_box_sizing() == box_sizing_border_box) + { + return m_padding.top + m_borders.top; + } + return 0; + } + + int box_sizing_bottom() const + { + if(css().get_box_sizing() == box_sizing_border_box) + { + return m_padding.bottom + m_borders.bottom; + } + return 0; + } + + int box_sizing_height() const + { + return box_sizing_top() + box_sizing_bottom(); + } + + void parent(const std::shared_ptr& par) + { + m_parent = par; + } + + const std::shared_ptr& src_el() const + { + return m_element; + } + + const css_properties& css() const + { + return m_element->css(); + } + + void add_child(const std::shared_ptr& ri) + { + m_children.push_back(ri); + ri->parent(shared_from_this()); + } + + bool is_root() const + { + return m_parent.expired(); + } + + bool collapse_top_margin() const + { + return !m_borders.top && + !m_padding.top && + m_element->in_normal_flow() && + m_element->css().get_float() == float_none && + m_margins.top >= 0 && + !is_flex_item() && + !is_root(); + } + + bool collapse_bottom_margin() const + { + return !m_borders.bottom && + !m_padding.bottom && + m_element->in_normal_flow() && + m_element->css().get_float() == float_none && + m_margins.bottom >= 0 && + !is_root(); + } + + bool is_visible() const + { + return !(m_skip || src_el()->css().get_display() == display_none || src_el()->css().get_visibility() != visibility_visible); + } + + bool is_flex_item() const + { + auto par = parent(); + if(par && (par->css().get_display() == display_inline_flex || par->css().get_display() == display_flex)) + { + return true; + } + return false; + } + + int render(int x, int y, const containing_block_context& containing_block_size, formatting_context* fmt_ctx, bool second_pass = false); + void apply_relative_shift(const containing_block_context &containing_block_size); + void calc_outlines( int parent_width ); + int calc_auto_margins(int parent_width); // returns left margin + + virtual std::shared_ptr init(); + virtual void apply_vertical_align() {} + /** + * Get first baseline position. Default position is element bottom without bottom margin. + * @returns offset of the first baseline from element top + */ + virtual int get_first_baseline() { return height() - margin_bottom(); } + /** + * Get last baseline position. Default position is element bottom without bottom margin. + * @returns offset of the last baseline from element top + */ + virtual int get_last_baseline() { return height() - margin_bottom(); } + + virtual std::shared_ptr clone() + { + return std::make_shared(src_el()); + } + std::tuple< + std::shared_ptr, + std::shared_ptr, + std::shared_ptr + > split_inlines(); + bool fetch_positioned(); + void render_positioned(render_type rt = render_all); + void add_positioned(const std::shared_ptr &el); + void get_redraw_box(litehtml::position& pos, int x = 0, int y = 0); + void calc_document_size( litehtml::size& sz, litehtml::size& content_size, int x = 0, int y = 0 ); + virtual void get_inline_boxes( position::vector& /*boxes*/ ) const {}; + virtual void set_inline_boxes( position::vector& /*boxes*/ ) {}; + virtual void add_inline_box( const position& /*box*/ ) {}; + virtual void clear_inline_boxes() {}; + void draw_stacking_context( uint_ptr hdc, int x, int y, const position* clip, bool with_positioned ); + virtual void draw_children( uint_ptr hdc, int x, int y, const position* clip, draw_flag flag, int zindex ); + virtual int get_draw_vertical_offset() { return 0; } + virtual std::shared_ptr get_child_by_point(int x, int y, int client_x, int client_y, draw_flag flag, int zindex); + std::shared_ptr get_element_by_point(int x, int y, int client_x, int client_y); + bool is_point_inside( int x, int y ); + void dump(litehtml::dumper& cout); + position get_placement() const; + /** + * Returns the boxes of rendering element. All coordinates are absolute + * + * @param redraw_boxes [out] resulting rendering boxes + * @return + */ + void get_rendering_boxes( position::vector& redraw_boxes); + }; +} + +#endif //LH_RENDER_ITEM_H diff --git a/libs/litehtml/include/litehtml/render_table.h b/libs/litehtml/include/litehtml/render_table.h new file mode 100644 index 0000000000..57fe435df0 --- /dev/null +++ b/libs/litehtml/include/litehtml/render_table.h @@ -0,0 +1,56 @@ +#ifndef LITEHTML_RENDER_TABLE_H +#define LITEHTML_RENDER_TABLE_H + +#include "render_item.h" + +namespace litehtml +{ + class render_item_table : public render_item + { + protected: + // data for table rendering + std::unique_ptr m_grid; + int m_border_spacing_x; + int m_border_spacing_y; + + int _render(int x, int y, const containing_block_context &containing_block_size, formatting_context* fmt_ctx, bool second_pass) override; + + public: + explicit render_item_table(std::shared_ptr src_el); + + std::shared_ptr clone() override + { + return std::make_shared(src_el()); + } + void draw_children(uint_ptr hdc, int x, int y, const position* clip, draw_flag flag, int zindex) override; + int get_draw_vertical_offset() override; + std::shared_ptr init() override; + }; + + class render_item_table_part : public render_item + { + public: + explicit render_item_table_part(std::shared_ptr src_el) : render_item(std::move(src_el)) + {} + + std::shared_ptr clone() override + { + return std::make_shared(src_el()); + } + }; + + class render_item_table_row : public render_item + { + public: + explicit render_item_table_row(std::shared_ptr src_el) : render_item(std::move(src_el)) + {} + + std::shared_ptr clone() override + { + return std::make_shared(src_el()); + } + void get_inline_boxes( position::vector& boxes ) const override; + }; +} + +#endif //LITEHTML_RENDER_TABLE_H diff --git a/libs/litehtml/include/litehtml/string_id.h b/libs/litehtml/include/litehtml/string_id.h new file mode 100644 index 0000000000..56827a097d --- /dev/null +++ b/libs/litehtml/include/litehtml/string_id.h @@ -0,0 +1,306 @@ +#ifndef LH_STRING_ID_H +#define LH_STRING_ID_H + +namespace litehtml +{ + +#define STRING_ID(...)\ + enum string_id { __VA_ARGS__ };\ + const auto initial_string_ids = #__VA_ARGS__; + +STRING_ID( + + // HTML tags + _a_, + _abbr_, + _acronym_, + _address_, + _applet_, + _area_, + _article_, + _aside_, + _audio_, + _b_, + _base_, + _basefont_, + _bdi_, + _bdo_, + _big_, + _blockquote_, + _body_, + _br_, + _button_, + _canvas_, + _caption_, + _center_, + _cite_, + _code_, + _col_, + _colgroup_, + _data_, + _datalist_, + _dd_, + _del_, + _details_, + _dfn_, + _dialog_, + _dir_, + _div_, + _dl_, + _dt_, + _em_, + _embed_, + _fieldset_, + _figcaption_, + _figure_, + _footer_, + _form_, + _frame_, + _frameset_, + _h1_, + _h2_, + _h3_, + _h4_, + _h5_, + _h6_, + _head_, + _header_, + _hr_, + _html_, + _i_, + _iframe_, + _img_, + _input_, + _ins_, + _kbd_, + _label_, + _legend_, + _li_, + _link_, + _main_, + _map_, + _mark_, + _meta_, + _meter_, + _nav_, + _noframes_, + _noscript_, + _object_, + _ol_, + _optgroup_, + _option_, + _output_, + _p_, + _param_, + _picture_, + _pre_, + _progress_, + _q_, + _rp_, + _rt_, + _ruby_, + _s_, + _samp_, + _script_, + _section_, + _select_, + _small_, + _source_, + _span_, + _strike_, + _strong_, + _style_, + _sub_, + _summary_, + _sup_, + _svg_, + _table_, + _tbody_, + _td_, + _template_, + _textarea_, + _tfoot_, + _th_, + _thead_, + _time_, + _title_, + _tr_, + _track_, + _tt_, + _u_, + _ul_, + _var_, + _video_, + _wbr_, + + // litehtml internal tags + __tag_before_, // note: real tag cannot start with '-' + __tag_after_, + + // CSS pseudo-elements + _before_, + _after_, + + // CSS pseudo-classes + _root_, + _only_child_, + _only_of_type_, + _first_child_, + _first_of_type_, + _last_child_, + _last_of_type_, + _nth_child_, + _nth_of_type_, + _nth_last_child_, + _nth_last_of_type_, + _not_, + _lang_, + + _active_, + _hover_, + + // CSS property names + _background_, + _background_color_, + _background_image_, + _background_image_baseurl_, + _background_repeat_, + _background_origin_, + _background_clip_, + _background_attachment_, + _background_size_, + _background_position_, + _background_position_x_, + _background_position_y_, + + _border_, + _border_width_, + _border_style_, + _border_color_, + + _border_spacing_, + __litehtml_border_spacing_x_, + __litehtml_border_spacing_y_, + + _border_left_, + _border_right_, + _border_top_, + _border_bottom_, + + _border_left_style_, + _border_right_style_, + _border_top_style_, + _border_bottom_style_, + + _border_left_width_, + _border_right_width_, + _border_top_width_, + _border_bottom_width_, + + _border_left_color_, + _border_right_color_, + _border_top_color_, + _border_bottom_color_, + + _border_radius_, + _border_radius_x_, + _border_radius_y_, + + _border_bottom_left_radius_, + _border_bottom_left_radius_x_, + _border_bottom_left_radius_y_, + + _border_bottom_right_radius_, + _border_bottom_right_radius_x_, + _border_bottom_right_radius_y_, + + _border_top_left_radius_, + _border_top_left_radius_x_, + _border_top_left_radius_y_, + + _border_top_right_radius_, + _border_top_right_radius_x_, + _border_top_right_radius_y_, + + _list_style_, + _list_style_type_, + _list_style_position_, + _list_style_image_, + _list_style_image_baseurl_, + + _margin_, + _margin_left_, + _margin_right_, + _margin_top_, + _margin_bottom_, + _padding_, + _padding_left_, + _padding_right_, + _padding_top_, + _padding_bottom_, + + _font_, + _font_family_, + _font_style_, + _font_variant_, + _font_weight_, + _font_size_, + _line_height_, + _text_decoration_, + + _white_space_, + _text_align_, + _vertical_align_, + _color_, + _width_, + _height_, + _min_width_, + _min_height_, + _max_width_, + _max_height_, + _position_, + _overflow_, + _display_, + _visibility_, + _box_sizing_, + _z_index_, + _float_, + _clear_, + _text_indent_, + _left_, + _right_, + _top_, + _bottom_, + _cursor_, + _content_, + _border_collapse_, + _text_transform_, + + _flex_, + _flex_flow_, + _flex_direction_, + _flex_wrap_, + _justify_content_, + _align_items_, + _align_content_, + _align_self_, + _flex_grow_, + _flex_shrink_, + _flex_basis_, + + _caption_side_, + _order_, + + _counter_reset_, + _counter_increment_, +) +#undef STRING_ID +extern const string_id empty_id; // _id("") +extern const string_id star_id; // _id("*") + +string_id _id(const string& str); +const string& _s(string_id id); + +} // namespace litehtml + +#endif // LH_STRING_ID_H diff --git a/libs/litehtml/include/litehtml/style.h b/libs/litehtml/include/litehtml/style.h new file mode 100644 index 0000000000..9f25ed7f02 --- /dev/null +++ b/libs/litehtml/include/litehtml/style.h @@ -0,0 +1,215 @@ +#ifndef LH_STYLE_H +#define LH_STYLE_H + +namespace litehtml +{ + enum property_type + { + prop_type_invalid, // indicates "not found" condition in style::get_property + prop_type_inherit, // "inherit" was specified as the value of this property + + prop_type_enum_item, + prop_type_enum_item_vector, + prop_type_length, + prop_type_length_vector, + prop_type_number, + prop_type_color, + prop_type_string, + prop_type_string_vector, + prop_type_size_vector, + + prop_type_var, // also string, but needs further parsing because of var() + }; + + class property_value + { + public: + property_type m_type; + bool m_important; + + union { + int m_enum_item; + int_vector m_enum_item_vector; + css_length m_length; + length_vector m_length_vector; + float m_number; + web_color m_color; + string m_string; + string_vector m_string_vector; + size_vector m_size_vector; + }; + + property_value() + : m_type(prop_type_invalid) + { + } + property_value(bool important, property_type type) + : m_type(type), m_important(important) + { + } + property_value(const string& str, bool important, property_type type = prop_type_string) + : m_type(type), m_important(important), m_string(str) + { + } + property_value(const string_vector& vec, bool important) + : m_type(prop_type_string_vector), m_important(important), m_string_vector(vec) + { + } + property_value(const css_length& length, bool important) + : m_type(prop_type_length), m_important(important), m_length(length) + { + } + property_value(const length_vector& vec, bool important) + : m_type(prop_type_length_vector), m_important(important), m_length_vector(vec) + { + } + property_value(float number, bool important) + : m_type(prop_type_number), m_important(important), m_number(number) + { + } + property_value(int enum_item, bool important) + : m_type(prop_type_enum_item), m_important(important), m_enum_item(enum_item) + { + } + property_value(const int_vector& vec, bool important) + : m_type(prop_type_enum_item_vector), m_important(important), m_enum_item_vector(vec) + { + } + property_value(web_color color, bool important) + : m_type(prop_type_color), m_important(important), m_color(color) + { + } + property_value(const size_vector& vec, bool important) + : m_type(prop_type_size_vector), m_important(important), m_size_vector(vec) + { + } + ~property_value() + { + switch (m_type) + { + case prop_type_string: + case prop_type_var: + m_string.~string(); + break; + case prop_type_string_vector: + m_string_vector.~string_vector(); + break; + case prop_type_length: + m_length.~css_length(); + break; + case prop_type_length_vector: + m_length_vector.~length_vector(); + break; + case prop_type_enum_item_vector: + m_enum_item_vector.~int_vector(); + break; + case prop_type_color: + m_color.~web_color(); + break; + case prop_type_size_vector: + m_size_vector.~size_vector(); + break; + default: + break; + } + } + property_value& operator=(const property_value& val) + { + this->~property_value(); + + switch (val.m_type) + { + case prop_type_invalid: + new(this) property_value(); + break; + case prop_type_inherit: + new(this) property_value(val.m_important, val.m_type); + break; + case prop_type_string: + case prop_type_var: + new(this) property_value(val.m_string, val.m_important, val.m_type); + break; + case prop_type_string_vector: + new(this) property_value(val.m_string_vector, val.m_important); + break; + case prop_type_enum_item: + new(this) property_value(val.m_enum_item, val.m_important); + break; + case prop_type_enum_item_vector: + new(this) property_value(val.m_enum_item_vector, val.m_important); + break; + case prop_type_length: + new(this) property_value(val.m_length, val.m_important); + break; + case prop_type_length_vector: + new(this) property_value(val.m_length_vector, val.m_important); + break; + case prop_type_number: + new(this) property_value(val.m_number, val.m_important); + break; + case prop_type_color: + new(this) property_value(val.m_color, val.m_important); + break; + case prop_type_size_vector: + new(this) property_value(val.m_size_vector, val.m_important); + break; + } + + return *this; + } + }; + + typedef std::map props_map; + + class style + { + public: + typedef std::shared_ptr