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gsk: Cache per-glyph color information

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We don't really want to load the bitmaps every time
we create a render node, so do it once and cache the
information on the PangoFont.
This commit is contained in:
Matthias Clasen 2021-07-31 12:23:50 -04:00
parent 7e8f586859
commit a7a2dbc3ea
1 changed files with 52 additions and 1 deletions
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53
gsk/gskrendernodeimpl.c
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@ -4461,6 +4461,46 @@ glyph_has_color (FT_Face face,
return FALSE;
}
static GHashTable *
ensure_color_glyph_cache (const PangoFont *font)
{
GHashTable *cache;
cache = (GHashTable *) g_object_get_data (G_OBJECT (font), "gsk-color-glyph-cache");
if (!cache)
{
cache = g_hash_table_new (NULL, NULL);
g_object_set_data_full (G_OBJECT (font), "gsk-color-glyph-cache",
cache, (GDestroyNotify) g_hash_table_unref);
}
return cache;
}
static inline gboolean
lookup_color_glyph_cache (GHashTable *cache,
PangoGlyph glyph,
gboolean *has_color)
{
gpointer value;
if (g_hash_table_lookup_extended (cache, GUINT_TO_POINTER (glyph), NULL, &value))
{
*has_color = GPOINTER_TO_UINT (value);
return TRUE;
}
return FALSE;
}
static inline void
insert_color_glyph_cache (GHashTable *cache,
PangoGlyph glyph,
gboolean has_color)
{
g_hash_table_insert (cache, GUINT_TO_POINTER (glyph), GUINT_TO_POINTER (has_color));
}
static void
mark_color_glyphs (const PangoFont *font,
PangoGlyphInfo *glyphs,
@ -4468,6 +4508,7 @@ mark_color_glyphs (const PangoFont *font,
{
cairo_scaled_font_t *scaled_font;
FT_Face ft_face;
GHashTable *cache;
scaled_font = pango_cairo_font_get_scaled_font ((PangoCairoFont *)font);
if (cairo_scaled_font_get_type (scaled_font) != CAIRO_FONT_TYPE_FT)
@ -4477,9 +4518,19 @@ mark_color_glyphs (const PangoFont *font,
if (!FT_HAS_COLOR (ft_face))
goto out;
cache = ensure_color_glyph_cache (font);
for (int i = 0; i < num_glyphs; i++)
{
if (glyph_has_color (ft_face, glyphs[i].glyph))
gboolean has_color;
if (!lookup_color_glyph_cache (cache, glyphs[i].glyph, &has_color))
{
has_color = glyph_has_color (ft_face, glyphs[i].glyph);
insert_color_glyph_cache (cache, glyphs[i].glyph, has_color);
}
if (has_color)
GLYPH_SET_COLOR (&glyphs[i]);
}