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clutter/actor: Remove outdated comment

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Updating of the paint volume used for culling these days happens
during the finish-layout stage, not while painting. Also we have
geometry-based, not paint-based picking anymore.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1492>
This commit is contained in:
Jonas Dreßler 2022-10-30 10:30:42 +01:00 committed by Marge Bot
parent 0aba87308a
commit c40feb33fa
1 changed files with 0 additions and 27 deletions
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27
clutter/clutter/clutter-actor.c
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@ -3738,33 +3738,6 @@ clutter_actor_paint (ClutterActor *self,
*/
add_or_remove_flatten_effect (self);
/* We save the current paint volume so that the next time the
* actor queues a redraw we can constrain the redraw to just
* cover the union of the new bounding box and the old.
*
* We also fetch the current paint volume to perform culling so
* we can avoid painting actors outside the current clip region.
*
* If we are painting inside a clone, we should neither update
* the paint volume or use it to cull painting, since the paint
* box represents the location of the source actor on the
* screen.
*
* XXX: We are starting to do a lot of vertex transforms on
* the CPU in a typical paint, so at some point we should
* audit these and consider caching some things.
*
* NB: We don't perform culling while picking at this point because
* clutter-stage.c doesn't setup the clipping planes appropriately.
*
* NB: We don't want to update the last-paint-volume during picking
* because the last-paint-volume is used to determine the old screen
* space location of an actor that has moved so we can know the
* minimal region to redraw to clear an old view of the actor. If we
* update this during picking then by the time we come around to
* paint then the last-paint-volume would likely represent the new
* actor position not the old.
*/
culling_inhibited = priv->inhibit_culling_counter > 0;
if (!culling_inhibited && !in_clone_paint ())
{