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stage: Composite the opacity with the alpha channel

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The Stage's opacity should be composited with the alpha component of the
Stage's background color.
This commit is contained in:
Emmanuele Bassi 2009-12-07 17:35:17 +00:00
parent e6ca2d891a
commit 6a3f6a460e
1 changed files with 11 additions and 9 deletions
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18
clutter/clutter-stage.c
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@ -245,15 +245,23 @@ clutter_stage_paint (ClutterActor *self)
{ {
ClutterStagePrivate *priv = CLUTTER_STAGE (self)->priv; ClutterStagePrivate *priv = CLUTTER_STAGE (self)->priv;
CoglColor stage_color; CoglColor stage_color;
guint8 real_alpha;
CLUTTER_NOTE (PAINT, "Initializing stage paint"); CLUTTER_NOTE (PAINT, "Initializing stage paint");
/* composite the opacity to the stage color */
real_alpha = clutter_actor_get_opacity (self)
* priv->color.alpha
/ 255;
/* we use the real alpha to clear the stage if :use-alpha is
* set; the effect depends entirely on how the Clutter backend
*/
cogl_color_set_from_4ub (&stage_color, cogl_color_set_from_4ub (&stage_color,
priv->color.red, priv->color.red,
priv->color.green, priv->color.green,
priv->color.blue, priv->color.blue,
priv->use_alpha priv->use_alpha ? real_alpha
? priv->color.alpha
: 255); : 255);
cogl_clear (&stage_color, cogl_clear (&stage_color,
COGL_BUFFER_BIT_COLOR | COGL_BUFFER_BIT_COLOR |
@ -274,11 +282,6 @@ clutter_stage_paint (ClutterActor *self)
else else
cogl_disable_fog (); cogl_disable_fog ();
#if 0
CLUTTER_NOTE (PAINT, "Proxying the paint to the stage implementation");
_clutter_stage_window_paint (priv->impl);
#endif
/* this will take care of painting every child */ /* this will take care of painting every child */
CLUTTER_ACTOR_CLASS (clutter_stage_parent_class)->paint (self); CLUTTER_ACTOR_CLASS (clutter_stage_parent_class)->paint (self);
} }
@ -291,7 +294,6 @@ clutter_stage_pick (ClutterActor *self,
* emitted for the stage itself. The stage's pick id is effectively handled * emitted for the stage itself. The stage's pick id is effectively handled
* by the call to cogl_clear done in clutter-main.c:_clutter_do_pick_async() * by the call to cogl_clear done in clutter-main.c:_clutter_do_pick_async()
*/ */
clutter_container_foreach (CLUTTER_CONTAINER (self), clutter_container_foreach (CLUTTER_CONTAINER (self),
CLUTTER_CALLBACK (clutter_actor_paint), CLUTTER_CALLBACK (clutter_actor_paint),
NULL); NULL);