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actor: Provide a better get_paint_volume() implementation

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ClutterActor can do better by default than just giving up immediately.

An actor can check for the clip region, and for its children's paint
volume, for instance.

Just these two should give us a better default implementation for newly
written code.
This commit is contained in:
Emmanuele Bassi 2011-12-05 12:45:08 +00:00 committed by Emmanuele Bassi
parent 7195d0fccf
commit e62536fad6
1 changed files with 59 additions and 1 deletions
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60
clutter/clutter-actor.c
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@ -4119,7 +4119,65 @@ static gboolean
clutter_actor_real_get_paint_volume (ClutterActor *self,
ClutterPaintVolume *volume)
{
return FALSE;
ClutterActorPrivate *priv = self->priv;
gboolean res;
GList *l;
/* this is the default return value: we cannot know if a class
* is going to paint outside its allocation, so we take the
* conservative approach.
*/
res = FALSE;
/* if the actor has a clip set then we have a pretty definite
* size for the paint volume: the actor cannot possibly paint
* outside the clip region.
*/
if (priv->clip_to_allocation)
{
clutter_paint_volume_set_from_allocation (volume, self);
res = TRUE;
}
else if (priv->has_clip)
{
ClutterVertex origin;
origin.x = priv->clip[0];
origin.y = priv->clip[1];
origin.z = 0;
clutter_paint_volume_set_origin (volume, &origin);
clutter_paint_volume_set_width (volume, priv->clip[2]);
clutter_paint_volume_set_height (volume, priv->clip[3]);
res = TRUE;
}
/* if we don't have children we just bail out here */
if (priv->children == NULL)
return res;
/* but if we have children then we ask for their paint volume in
* our coordinates. if any of our children replies that it doesn't
* have a paint volume, we bail out
*/
for (l = priv->children; l != NULL; l = l->next)
{
ClutterActor *child = l->data;
const ClutterPaintVolume *child_volume;
child_volume = clutter_actor_get_transformed_paint_volume (child, self);
if (child_volume == NULL)
{
res = FALSE;
break;
}
clutter_paint_volume_union (volume, child_volume);
}
return res;
}
static gboolean