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gsk: Mark color glyphs

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Steal a bit from PangoGlyphVisAttr to mark glyphs
that have color.
This commit is contained in:
Matthias Clasen 2021-07-31 11:41:08 -04:00
parent a460fb2734
commit bb9dccd773
1 changed files with 64 additions and 2 deletions
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66
gsk/gskrendernodeimpl.c
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@ -4377,6 +4377,15 @@ gsk_text_node_draw (GskRenderNode *node,
cairo_restore (cr);
}
/* We steal one of the bits in PangoGlyphVisAttr */
G_STATIC_ASSERT (sizeof (PangoGlyphVisAttr) == 4);
#define COLOR_GLYPH_BIT 2
#define GLYPH_IS_COLOR(g) (((*(guint32*)&(g)->attr) & COLOR_GLYPH_BIT) != 0)
#define GLYPH_SET_COLOR(g) (*(guint32*)(&(g)->attr) |= COLOR_GLYPH_BIT)
#define GLYPH_CLEAR_COLOR(g) (*(guint32*)(&(g)->attr) &= ~COLOR_GLYPH_BIT)
static void
gsk_text_node_diff (GskRenderNode *node1,
GskRenderNode *node2,
@ -4401,7 +4410,8 @@ gsk_text_node_diff (GskRenderNode *node1,
info1->geometry.width == info2->geometry.width &&
info1->geometry.x_offset == info2->geometry.x_offset &&
info1->geometry.y_offset == info2->geometry.y_offset &&
info1->attr.is_cluster_start == info2->attr.is_cluster_start)
info1->attr.is_cluster_start == info2->attr.is_cluster_start &&
GLYPH_IS_COLOR (info1) == GLYPH_IS_COLOR (info2))
continue;
gsk_render_node_diff_impossible (node1, node2, region);
@ -4431,6 +4441,52 @@ font_has_color_glyphs (const PangoFont *font)
return has_color;
}
static gboolean
glyph_has_color (FT_Face face,
guint glyph)
{
FT_Error error;
error = FT_Load_Glyph (face, glyph, FT_LOAD_COLOR);
if (error != 0)
return FALSE;
error = FT_Render_Glyph (face->glyph, FT_RENDER_MODE_NORMAL);
if (error != 0)
return FALSE;
if (face->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_BGRA)
return TRUE;
return FALSE;
}
static void
mark_color_glyphs (const PangoFont *font,
PangoGlyphInfo *glyphs,
int num_glyphs)
{
cairo_scaled_font_t *scaled_font;
FT_Face ft_face;
scaled_font = pango_cairo_font_get_scaled_font ((PangoCairoFont *)font);
if (cairo_scaled_font_get_type (scaled_font) != CAIRO_FONT_TYPE_FT)
return;
ft_face = cairo_ft_scaled_font_lock_face (scaled_font);
if (!FT_HAS_COLOR (ft_face))
goto out;
for (int i = 0; i < num_glyphs; i++)
{
if (glyph_has_color (ft_face, glyphs[i].glyph))
GLYPH_SET_COLOR (&glyphs[i]);
}
out:
cairo_ft_scaled_font_unlock_face (scaled_font);
}
/**
* gsk_text_node_new:
* @font: the `PangoFont` containing the glyphs
@ -4476,9 +4532,15 @@ gsk_text_node_new (PangoFont *font,
for (int i = 0; i < glyphs->num_glyphs; i++)
{
if (glyphs->glyphs[i].glyph != PANGO_GLYPH_EMPTY)
self->glyphs[self->num_glyphs++] = glyphs->glyphs[i];
{
self->glyphs[self->num_glyphs] = glyphs->glyphs[i];
GLYPH_CLEAR_COLOR (&self->glyphs[self->num_glyphs]);
self->num_glyphs++;
}
}
mark_color_glyphs (font, self->glyphs, self->num_glyphs);
graphene_rect_init (&node->bounds,
offset->x + ink_rect.x - 1,
offset->y + ink_rect.y - 1,