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window-actor: Cull out areas covered by opaque windows

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Wayland clients do this through the opaque region in the surface
actor. However X11 clients were considered fully transparent for
culling purposes, which may result in mutter painting other bits
of the background or other windows that will be painted over in
reality.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/698
This commit is contained in:
Carlos Garnacho 2019-01-27 15:45:10 +01:00
parent cc5968109b
commit ac7aa11417
1 changed files with 18 additions and 0 deletions
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18
src/compositor/meta-window-actor.c
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@ -1370,9 +1370,27 @@ meta_window_actor_cull_out (MetaCullable *cullable,
cairo_region_t *clip_region)
{
MetaWindowActor *self = META_WINDOW_ACTOR (cullable);
MetaWindowActorPrivate *priv =
meta_window_actor_get_instance_private (self);
meta_cullable_cull_out_children (cullable, unobscured_region, clip_region);
meta_window_actor_set_clip_region_beneath (self, clip_region);
if (unobscured_region && !is_non_opaque (self))
{
cairo_region_t *region = meta_window_get_frame_bounds (priv->window);
if (region)
{
cairo_region_subtract (unobscured_region, region);
}
else
{
cairo_rectangle_int_t rect;
meta_window_get_frame_rect (priv->window, &rect);
cairo_region_subtract_rectangle (unobscured_region, &rect);
}
}
}
static void