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actor: Split get_paint_opacity() from the type check

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Since get_paint_opacity() recurses through the hierarchy it might lead
to a lot of type checks while we walk the parent-child chain. We can
split the recursive function from the public entry point and perform the
type check just once.
This commit is contained in:
Emmanuele Bassi 2010-02-12 16:24:27 +00:00
parent 37d51cb78e
commit 2018b5b167
1 changed files with 35 additions and 20 deletions
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55
clutter/clutter-actor.c
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@ -6261,6 +6261,40 @@ clutter_actor_set_opacity (ClutterActor *self,
} }
} }
/*
* clutter_actor_get_paint_opacity_internal:
* @self: a #ClutterActor
*
* Retrieves the absolute opacity of the actor, as it appears on the stage
*
* This function does not do type checks
*
* Return value: the absolute opacity of the actor
*/
static guint8
clutter_actor_get_paint_opacity_internal (ClutterActor *self)
{
ClutterActorPrivate *priv = self->priv;
ClutterActor *parent;
if (priv->opacity_parent != NULL)
return clutter_actor_get_paint_opacity_internal (priv->opacity_parent);
parent = priv->parent_actor;
/* Factor in the actual actors opacity with parents */
if (parent != NULL)
{
guint8 opacity = clutter_actor_get_paint_opacity_internal (parent);
if (opacity != 0xff)
return (opacity * priv->opacity) / 0xff;
}
return priv->opacity;
}
/** /**
* clutter_actor_get_paint_opacity: * clutter_actor_get_paint_opacity:
* @self: A #ClutterActor * @self: A #ClutterActor
@ -6280,28 +6314,9 @@ clutter_actor_set_opacity (ClutterActor *self,
guint8 guint8
clutter_actor_get_paint_opacity (ClutterActor *self) clutter_actor_get_paint_opacity (ClutterActor *self)
{ {
ClutterActorPrivate *priv;
ClutterActor *parent;
g_return_val_if_fail (CLUTTER_IS_ACTOR (self), 0); g_return_val_if_fail (CLUTTER_IS_ACTOR (self), 0);
priv = self->priv; return clutter_actor_get_paint_opacity_internal (self);
if (priv->opacity_parent != NULL)
return clutter_actor_get_paint_opacity (priv->opacity_parent);
parent = priv->parent_actor;
/* Factor in the actual actors opacity with parents */
if (G_LIKELY (parent != NULL))
{
guint8 opacity = clutter_actor_get_paint_opacity (parent);
if (opacity != 0xff)
return (opacity * priv->opacity) / 0xff;
}
return priv->opacity;
} }
/** /**