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pixelcache: use GtkStyleContext to determine cairo_content_t for surface

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We can take a fast path if the background for a widget is opaque by using
a CAIRO_CONTENT_COLOR instead of a CAIRO_CONTENT_COLOR_ALPHA surface. Most
blit'ing backends have a fast path for this, including Pixman and Quartz.

https://bugzilla.gnome.org/show_bug.cgi?id=754658
This commit is contained in:
Christian Hergert 2015-09-08 14:48:40 -07:00
parent c1691a4964
commit d7eb90779f
2 changed files with 17 additions and 5 deletions
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20
gtk/gtkpixelcache.c
View File

@ -45,6 +45,9 @@ struct _GtkPixelCache {
/* may be null if not dirty */
cairo_region_t *surface_dirty;
/* background tracking for rgb/rgba */
GtkStyleContext *style_context;
guint timeout_tag;
guint extra_width;
@ -88,6 +91,8 @@ _gtk_pixel_cache_free (GtkPixelCache *cache)
if (cache->surface_dirty != NULL)
cairo_region_destroy (cache->surface_dirty);
g_clear_object (&cache->style_context);
g_free (cache);
}
@ -193,11 +198,8 @@ _gtk_pixel_cache_create_surface_if_needed (GtkPixelCache *cache,
if (!content)
{
content = CAIRO_CONTENT_COLOR_ALPHA;
bg = gdk_window_get_background_pattern (window);
if (bg != NULL &&
cairo_pattern_get_type (bg) == CAIRO_PATTERN_TYPE_SOLID &&
cairo_pattern_get_rgba (bg, &red, &green, &blue, &alpha) == CAIRO_STATUS_SUCCESS &&
alpha == 1.0)
if (cache->style_context &&
_gtk_style_context_is_background_opaque (cache->style_context))
content = CAIRO_CONTENT_COLOR;
}
@ -500,3 +502,11 @@ _gtk_pixel_cache_set_always_cache (GtkPixelCache *cache,
{
cache->always_cache = !!always_cache;
}
void
_gtk_pixel_cache_set_style_context (GtkPixelCache *cache,
GtkStyleContext *style_context)
{
if (g_set_object (&cache->style_context, style_context))
_gtk_pixel_cache_invalidate (cache, NULL);
}

2
gtk/gtkpixelcacheprivate.h
View File

@ -54,6 +54,8 @@ void _gtk_pixel_cache_set_content (GtkPixelCache *cache,
gboolean _gtk_pixel_cache_get_always_cache (GtkPixelCache *cache);
void _gtk_pixel_cache_set_always_cache (GtkPixelCache *cache,
gboolean always_cache);
void _gtk_pixel_cache_set_style_context(GtkPixelCache *cache,
GtkStyleContext *style_context);
G_END_DECLS