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[hb-cairo] Add a color cache

This commit is contained in:
Behdad Esfahbod 2023-01-20 14:57:57 -07:00
parent 10def9b3df
commit cc9b55c794
1 changed files with 24 additions and 0 deletions
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24
src/hb-cairo.cc
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@ -306,6 +306,8 @@ 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 const cairo_user_data_key_t color_cache_key = {0};
static hb_bool_t
hb_cairo_paint_custom_palette_color (hb_paint_funcs_t *funcs,
void *paint_data,
@ -316,6 +318,16 @@ hb_cairo_paint_custom_palette_color (hb_paint_funcs_t *funcs,
#ifdef HAVE_CAIRO_FONT_OPTIONS_GET_CUSTOM_PALETTE_COLOR
cairo_t *cr = (cairo_t *) paint_data;
#define DEADBEEF HB_TAG(0xDE,0xAD,0xBE,0xEF)
hb_map_t *color_cache = (hb_map_t *) cairo_get_user_data (cr, &color_cache_key);
hb_codepoint_t *c;
if (likely (color_cache && color_cache->has (color_index, &c)))
{
*color = *c;
return true;
}
cairo_font_options_t *options;
double red, green, blue, alpha;
@ -327,11 +339,18 @@ hb_cairo_paint_custom_palette_color (hb_paint_funcs_t *funcs,
{
cairo_font_options_destroy (options);
*color = HB_COLOR (255 * blue, 255 * green, 255 * red, 255 * alpha);
if (likely (color_cache && *color != DEADBEEF))
color_cache->set (color_index, *color);
return true;
}
cairo_font_options_destroy (options);
#endif
if (likely (color_cache))
color_cache->set (color_index, DEADBEEF);
return false;
}
@ -556,8 +575,13 @@ hb_cairo_render_color_glyph (cairo_scaled_font_t *scaled_font,
hb_font_get_scale (font, &x_scale, &y_scale);
cairo_scale (cr, +1./x_scale, -1./y_scale);
hb_map_t color_cache;
cairo_set_user_data (cr, &color_cache_key, &color_cache, nullptr);
hb_font_paint_glyph (font, glyph, hb_cairo_paint_get_funcs (), cr, palette, color);
cairo_set_user_data (cr, &color_cache_key, nullptr, nullptr);
return CAIRO_STATUS_SUCCESS;
}