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x11: Use has_allocation() in TfP actor

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ClutterX11TexturePixmap calls get_allocation_box() when queueing a
clipped redraw. If the allocation is not valid, and if we queue a
lot of redraws in response to a series of damage events, the net
result is that we spend all our time in a re-layout. We can
short-circuit this by checking if the actor has a valid allocation, and
if not, just queue a redraw - the actor will be allocated by the time it
is going to be painted.

Signed-off-by: Emmanuele Bassi <ebassi@linux.intel.com>
This commit is contained in:
Owen W. Taylor 2010-03-26 00:41:46 +00:00 committed by Emmanuele Bassi
parent 8df4a0b8fd
commit 6fcc8c5bce
1 changed files with 11 additions and 7 deletions
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18
clutter/x11/clutter-x11-texture-pixmap.c
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@ -435,14 +435,18 @@ clutter_x11_texture_pixmap_real_queue_damage_redraw (
* actor coordinates...
*/
/* XXX: we don't care if we get an out of date allocation here because
* clutter_actor_queue_clipped_redraw knows to ignore the clip if the
* actor's allocation is invalid.
*
* This is noted because clutter_actor_get_allocation_box does some
* unnecessary work to support buggy code with a comment suggesting that
* it could be changed later which would be good for this use case!
/* Calling clutter_actor_get_allocation_box() is enormously expensive
* if the actor has an out-of-date allocation, since it triggers
* a full redraw. clutter_actor_queue_clipped_redraw() would redraw
* the whole stage anyways in that case, so just go ahead and do
* it here.
*/
if (!clutter_actor_has_allocation (self))
{
clutter_actor_queue_redraw (self);
return;
}
clutter_actor_get_allocation_box (self, &allocation);
g_object_get (self,