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effect: Allow any effect to override the paint volume

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An Effect implementation might override the paint volume of the actor to
which it is applied to. The get_paint_volume() virtual function should
be added to the Effect class vtable so that any effect can get the
current paint volume and update it.

The clutter_actor_get_paint_volume() function becomes context aware, and
does the right thing if called from within a ClutterEffect pre_paint()
or post_paint() implementation, by allowing all effects in the chain up
to the caller to modify the paint volume.
This commit is contained in:
Emmanuele Bassi
2010-08-16 17:02:15 +01:00
committed by Robert Bragg
parent 94ce747f83
commit 25abdf09b7
4 changed files with 80 additions and 6 deletions
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9
clutter/clutter-effect.h
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@ -72,16 +72,21 @@ struct _ClutterEffectClass
ClutterActorMetaClass parent_class;
/*< public >*/
gboolean (* pre_paint) (ClutterEffect *effect);
void (* post_paint) (ClutterEffect *effect);
gboolean (* pre_paint) (ClutterEffect *effect);
void (* post_paint) (ClutterEffect *effect);
void (* get_paint_volume) (ClutterEffect *effect,
ClutterPaintVolume *volume);
/*< private >*/
void (* _clutter_effect0) (void);
void (* _clutter_effect1) (void);
void (* _clutter_effect2) (void);
void (* _clutter_effect3) (void);
void (* _clutter_effect4) (void);
void (* _clutter_effect5) (void);
void (* _clutter_effect6) (void);
void (* _clutter_effect7) (void);
};
GType clutter_effect_get_type (void) G_GNUC_CONST;