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clutter/actor: Handle clips correctly when building paint volume

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clutter_actor_paint() implements a clear preference for custom clips
over clip_to_allocation: If a custom clip is set, clip_to_allocation is
ignored.

Since the paint volume reflects what Clutter is going to paint, we
should handle it the same when putting together our paint volume: So
first handle custom clips, and if one is set, use that. Then handle
clip_to_allocation, and if that's set, use that. And finally, if both
aren't set, union our allocation with the children paint volumes to get
the building volume.

clutter_actor_paint() also doesn't check whether the custom clip is
empty: If that's the case, it will simply not paint anything. Given that
that's allowed by clutter_actor_paint(), the paint volume should also
follow here and return an empty paint volume in case the custom clip is
empty.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1592>
This commit is contained in:
Jonas Dreßler 2020-11-21 11:26:42 +01:00 committed by Marge Bot
parent 44563d2932
commit b5a7fe4b23
1 changed files with 15 additions and 17 deletions
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32
clutter/clutter/clutter-actor.c
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@ -5701,6 +5701,21 @@ clutter_actor_update_default_paint_volume (ClutterActor *self,
if (priv->needs_allocation)
return FALSE;
if (priv->has_clip)
{
graphene_point3d_t origin;
origin.x = priv->clip.origin.x;
origin.y = priv->clip.origin.y;
origin.z = 0;
clutter_paint_volume_set_origin (volume, &origin);
clutter_paint_volume_set_width (volume, priv->clip.size.width);
clutter_paint_volume_set_height (volume, priv->clip.size.height);
return TRUE;
}
/* we start from the allocation */
clutter_paint_volume_set_width (volume,
priv->allocation.x2 - priv->allocation.x1);
@ -5722,23 +5737,6 @@ clutter_actor_update_default_paint_volume (ClutterActor *self,
{
ClutterActor *child;
if (priv->has_clip &&
priv->clip.size.width >= 0 &&
priv->clip.size.height >= 0)
{
graphene_point3d_t origin;
origin.x = priv->clip.origin.x;
origin.y = priv->clip.origin.y;
origin.z = 0;
clutter_paint_volume_set_origin (volume, &origin);
clutter_paint_volume_set_width (volume, priv->clip.size.width);
clutter_paint_volume_set_height (volume, priv->clip.size.height);
return TRUE;
}
/* if we don't have children we just bail out here... */
if (priv->n_children == 0)
return res;