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compositor: Observe frame opaque region when updating shapes

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Apply either frame or client window opaque regions (or both as
an union). For client windows without an alpha channel, the frame
shape already contains the client area. If the client window does
have an alpha channel, the client rectangle is cleared to let the
client's opaque region take care of it.

Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/2555
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2758>
This commit is contained in:
Carlos Garnacho 2022-12-16 13:06:22 +01:00
parent 4752a8055c
commit 2b6651327e
1 changed files with 37 additions and 19 deletions
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56
src/compositor/meta-window-actor-x11.c
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@ -990,35 +990,53 @@ update_opaque_region (MetaWindowActorX11 *actor_x11)
MetaWindow *window =
meta_window_actor_get_meta_window (META_WINDOW_ACTOR (actor_x11));
gboolean is_maybe_transparent;
cairo_region_t *opaque_region;
cairo_region_t *opaque_region = NULL;
MetaSurfaceActor *surface;
is_maybe_transparent = is_actor_maybe_transparent (actor_x11);
if (is_maybe_transparent && window->opaque_region)
if (is_maybe_transparent &&
(window->opaque_region ||
(window->frame && window->frame->opaque_region)))
{
cairo_rectangle_int_t client_area;
if (window->frame && window->frame->opaque_region)
opaque_region = cairo_region_copy (window->frame->opaque_region);
get_client_area_rect (actor_x11, &client_area);
/* The opaque region is defined to be a part of the
* window which ARGB32 will always paint with opaque
* pixels. For these regions, we want to avoid painting
* windows and shadows beneath them.
*
* If the client gives bad coordinates where it does not
* fully paint, the behavior is defined by the specification
* to be undefined, and considered a client bug. In mutter's
* case, graphical glitches will occur.
*/
opaque_region = cairo_region_copy (window->opaque_region);
cairo_region_translate (opaque_region, client_area.x, client_area.y);
if (opaque_region && meta_window_x11_has_alpha_channel (window))
cairo_region_subtract_rectangle (opaque_region, &client_area);
if (window->opaque_region)
{
cairo_region_t *client_opaque_region;
/* The opaque region is defined to be a part of the
* window which ARGB32 will always paint with opaque
* pixels. For these regions, we want to avoid painting
* windows and shadows beneath them.
*
* If the client gives bad coordinates where it does not
* fully paint, the behavior is defined by the specification
* to be undefined, and considered a client bug. In mutter's
* case, graphical glitches will occur.
*/
client_opaque_region = cairo_region_copy (window->opaque_region);
cairo_region_translate (client_opaque_region,
client_area.x, client_area.y);
if (opaque_region)
cairo_region_union (opaque_region, client_opaque_region);
else
opaque_region = cairo_region_reference (client_opaque_region);
cairo_region_destroy (client_opaque_region);
}
cairo_region_intersect (opaque_region, actor_x11->shape_region);
}
else if (is_maybe_transparent)
{
opaque_region = NULL;
}
else
else if (!is_maybe_transparent)
{
opaque_region = cairo_region_reference (actor_x11->shape_region);
}