diff options
Diffstat (limited to 'libs/litehtml/containers/cairo/container_cairo_pango.cpp')
| -rw-r--r-- | libs/litehtml/containers/cairo/container_cairo_pango.cpp | 180 |
1 files changed, 180 insertions, 0 deletions
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); +} + |