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Hook up custom palettes for cairo

This commit is contained in:
Matthias Clasen 2023-01-18 23:29:37 -05:00 committed by Behdad Esfahbod
parent cce7c441eb
commit ab37ade7e4
1 changed files with 36 additions and 0 deletions
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36
src/hb-cairo.cc
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@ -306,6 +306,41 @@ hb_cairo_paint_sweep_gradient (hb_paint_funcs_t *pfuncs HB_UNUSED,
_hb_cairo_paint_sweep_gradient (cr, color_line, x0, y0, start_angle, end_angle);
}
static hb_color_t
hb_cairo_paint_custom_palette_color (hb_paint_funcs_t *funcs,
void *paint_data,
unsigned int color_index,
void *user_data HB_UNUSED)
{
cairo_t *cr = (cairo_t *) paint_data;
#ifdef CAIRO_COLOR_PALETTE_CUSTOM
cairo_font_options_t *options;
double red, green, blue, alpha;
options = cairo_font_options_create ();
cairo_get_font_options (cr, options);
if (cairo_font_options_get_custom_palette_color (options, color_index,
&red, &green, &blue, &alpha))
{
cairo_font_options_destroy (options);
return HB_COLOR (255 * blue, 255 * green, 255 * red, 255 * alpha);
}
cairo_font_options_destroy (options);
#endif
// Fall back to the default palette
cairo_scaled_font_t *scaled_font = cairo_get_scaled_font (cr);
hb_font_t *font = hb_cairo_scaled_font_get_font (scaled_font);
hb_face_t *face = hb_font_get_face (font);
hb_color_t color;
unsigned int len = 1;
hb_ot_color_palette_get_colors (face, 0, color_index, &len, &color);
return color;
}
static inline void free_static_cairo_paint_funcs ();
static struct hb_cairo_paint_funcs_lazy_loader_t : hb_paint_funcs_lazy_loader_t<hb_cairo_paint_funcs_lazy_loader_t>
@ -326,6 +361,7 @@ static struct hb_cairo_paint_funcs_lazy_loader_t : hb_paint_funcs_lazy_loader_t<
hb_paint_funcs_set_linear_gradient_func (funcs, hb_cairo_paint_linear_gradient, nullptr, nullptr);
hb_paint_funcs_set_radial_gradient_func (funcs, hb_cairo_paint_radial_gradient, nullptr, nullptr);
hb_paint_funcs_set_sweep_gradient_func (funcs, hb_cairo_paint_sweep_gradient, nullptr, nullptr);
hb_paint_funcs_set_custom_palette_color_func (funcs, hb_cairo_paint_custom_palette_color, nullptr, nullptr);
hb_paint_funcs_make_immutable (funcs);