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background: Don't render with blending when we don't need to

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If we have an opaque background image, then we shouldn't need to blend
against anything for it to work. Turn off blending in this case.
This commit is contained in:
Jasper St. Pierre 2014-08-07 12:38:42 -04:00
parent d72bf0cd5d
commit 2d6954186e
1 changed files with 28 additions and 0 deletions
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28
src/compositor/meta-background.c
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@ -288,6 +288,26 @@ get_wrap_mode (MetaBackground *self)
} }
} }
static gboolean
texture_has_alpha (CoglTexture *texture)
{
if (!texture)
return FALSE;
switch (cogl_texture_get_components (texture))
{
case COGL_TEXTURE_COMPONENTS_A:
case COGL_TEXTURE_COMPONENTS_RGBA:
return TRUE;
case COGL_TEXTURE_COMPONENTS_RG:
case COGL_TEXTURE_COMPONENTS_RGB:
case COGL_TEXTURE_COMPONENTS_DEPTH:
return FALSE;
default:
g_assert_not_reached ();
}
}
static ClutterPaintNode * static ClutterPaintNode *
meta_background_paint_node_new (MetaBackground *self, meta_background_paint_node_new (MetaBackground *self,
ClutterActor *actor) ClutterActor *actor)
@ -296,6 +316,7 @@ meta_background_paint_node_new (MetaBackground *self,
ClutterPaintNode *node; ClutterPaintNode *node;
guint8 opacity; guint8 opacity;
guint8 color_component; guint8 color_component;
gboolean needs_blending;
opacity = clutter_actor_get_paint_opacity (actor); opacity = clutter_actor_get_paint_opacity (actor);
color_component = (guint8) (0.5 + opacity * priv->brightness); color_component = (guint8) (0.5 + opacity * priv->brightness);
@ -308,6 +329,13 @@ meta_background_paint_node_new (MetaBackground *self,
node = clutter_pipeline_node_new (priv->pipeline); node = clutter_pipeline_node_new (priv->pipeline);
needs_blending = (opacity < 255) || (texture_has_alpha (priv->texture));
if (needs_blending)
cogl_pipeline_set_blend (priv->pipeline, "RGBA = ADD (SRC_COLOR, DST_COLOR*(1-SRC_COLOR[A]))", NULL);
else
cogl_pipeline_set_blend (priv->pipeline, "RGBA = ADD (SRC_COLOR, 0)", NULL);
return node; return node;
} }