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background-actor: Clip obscured background areas

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The MetaBackgroundActor was ignoring the unobscured area altogether,
and just painted according to the clip area. Check the unobscured
area too, as it might well be covered by client windows.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/698
This commit is contained in:
Carlos Garnacho 2019-01-27 15:49:41 +01:00
parent ac7aa11417
commit 90a5582a73
1 changed files with 51 additions and 19 deletions
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60
src/compositor/meta-background-actor.c
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@ -179,6 +179,7 @@ struct _MetaBackgroundActor
gboolean force_bilinear;
cairo_region_t *clip_region;
cairo_region_t *unobscured_region;
};
static void cullable_iface_init (MetaCullableInterface *iface);
@ -195,12 +196,22 @@ set_clip_region (MetaBackgroundActor *self,
self->clip_region = cairo_region_copy (clip_region);
}
static void
set_unobscured_region (MetaBackgroundActor *self,
cairo_region_t *unobscured_region)
{
g_clear_pointer (&self->unobscured_region, cairo_region_destroy);
if (unobscured_region)
self->unobscured_region = cairo_region_copy (unobscured_region);
}
static void
meta_background_actor_dispose (GObject *object)
{
MetaBackgroundActor *self = META_BACKGROUND_ACTOR (object);
set_clip_region (self, NULL);
set_unobscured_region (self, NULL);
meta_background_actor_set_background (self, NULL);
if (self->pipeline)
{
@ -502,7 +513,8 @@ meta_background_actor_paint (ClutterActor *actor)
ClutterActorBox actor_box;
cairo_rectangle_int_t actor_pixel_rect;
CoglFramebuffer *fb;
int i;
cairo_region_t *region;
int i, n_rects;
if ((self->clip_region && cairo_region_is_empty (self->clip_region)))
return;
@ -524,27 +536,43 @@ meta_background_actor_paint (ClutterActor *actor)
/* Now figure out what to actually paint.
*/
if (self->clip_region != NULL)
if (self->clip_region)
{
int n_rects = cairo_region_num_rectangles (self->clip_region);
region = cairo_region_copy (self->clip_region);
cairo_region_intersect_rectangle (region, &actor_pixel_rect);
}
else
{
region = cairo_region_create_rectangle (&actor_pixel_rect);
}
if (self->unobscured_region)
cairo_region_intersect (region, self->unobscured_region);
if (cairo_region_is_empty (region))
{
cairo_region_destroy (region);
return;
}
n_rects = cairo_region_num_rectangles (region);
if (n_rects <= MAX_RECTS)
{
for (i = 0; i < n_rects; i++)
{
cairo_rectangle_int_t rect;
cairo_region_get_rectangle (self->clip_region, i, &rect);
if (!gdk_rectangle_intersect (&actor_pixel_rect, &rect, &rect))
continue;
paint_clipped_rectangle (fb, self->pipeline, &rect, &self->texture_area);
}
return;
cairo_region_get_rectangle (region, i, &rect);
paint_clipped_rectangle (fb, self->pipeline, &rect,
&self->texture_area);
}
}
paint_clipped_rectangle (fb, self->pipeline, &actor_pixel_rect, &self->texture_area);
else
{
cairo_rectangle_int_t rect;
cairo_region_get_extents (region, &rect);
paint_clipped_rectangle (fb, self->pipeline, &rect,
&self->texture_area);
}
}
static void
@ -798,6 +826,8 @@ meta_background_actor_cull_out (MetaCullable *cullable,
cairo_region_t *clip_region)
{
MetaBackgroundActor *self = META_BACKGROUND_ACTOR (cullable);
set_unobscured_region (self, unobscured_region);
set_clip_region (self, clip_region);
}
@ -805,6 +835,8 @@ static void
meta_background_actor_reset_culling (MetaCullable *cullable)
{
MetaBackgroundActor *self = META_BACKGROUND_ACTOR (cullable);
set_unobscured_region (self, NULL);
set_clip_region (self, NULL);
}