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#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);
}
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