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Turn off background repeats for a full-size image

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If we have repeats on for a full-sized image, then if the background
is displayed scaled (for example, in a desktop preview mode) then we
can get artifacts along the edge of the background where the repeat
of the opposite edge is blended in by bilinear scaling. So turn off
repeats when the screen and background image sizes match.

https://bugzilla.gnome.org/show_bug.cgi?id=634833
This commit is contained in:
Owen W. Taylor 2010-11-15 16:19:28 -05:00
parent 07e6c5aac2
commit 6260814285
3 changed files with 40 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/compositor/compositor.c
View File

@ -1081,8 +1081,8 @@ meta_compositor_sync_screen_size (MetaCompositor *compositor,
g_return_if_fail (info);
clutter_actor_set_size (info->stage, width, height);
/* Background actor always requests the screen size */
clutter_actor_queue_relayout (info->background_actor);
meta_background_actor_screen_size_changed (META_BACKGROUND_ACTOR (info->background_actor));
meta_verbose ("Changed size for stage on screen %d to %dx%d\n",
meta_screen_get_screen_number (screen),

34
src/compositor/meta-background-actor.c
View File

@ -55,6 +55,26 @@ struct _MetaBackgroundActor
G_DEFINE_TYPE (MetaBackgroundActor, meta_background_actor, CLUTTER_TYPE_ACTOR);
static void
update_wrap_mode (MetaBackgroundActor *self)
{
int width, height;
CoglMaterialWrapMode wrap_mode;
meta_screen_get_size (self->screen, &width, &height);
/* We turn off repeating when we have a full-screen pixmap to keep from
* getting artifacts from one side of the image sneaking into the other
* side of the image via bilinear filtering.
*/
if (width == self->texture_width && height == self->texture_height)
wrap_mode = COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE;
else
wrap_mode = COGL_PIPELINE_WRAP_MODE_REPEAT;
cogl_material_set_layer_wrap_mode (self->material, 0, wrap_mode);
}
static void
set_texture (MetaBackgroundActor *self,
CoglHandle texture)
@ -73,6 +93,8 @@ set_texture (MetaBackgroundActor *self,
self->texture_width = cogl_texture_get_width (texture);
self->texture_height = cogl_texture_get_height (texture);
update_wrap_mode (self);
clutter_actor_queue_redraw (CLUTTER_ACTOR (self));
}
@ -378,3 +400,15 @@ meta_background_actor_set_visible_region (MetaBackgroundActor *self,
}
}
/**
* meta_background_actor_screen_size_changed:
* @self: a #MetaBackgroundActor
*
* Called by the compositor when the size of the #MetaScreen changes
*/
void
meta_background_actor_screen_size_changed (MetaBackgroundActor *self)
{
update_wrap_mode (self);
clutter_actor_queue_relayout (CLUTTER_ACTOR (self));
}

7
src/compositor/meta-background-actor.h
View File

@ -50,8 +50,9 @@ GType meta_background_actor_get_type (void);
ClutterActor *meta_background_actor_new (MetaScreen *screen);
void meta_background_actor_update (MetaBackgroundActor *actor);
void meta_background_actor_set_visible_region (MetaBackgroundActor *self,
cairo_region_t *visible_region);
void meta_background_actor_update (MetaBackgroundActor *actor);
void meta_background_actor_set_visible_region (MetaBackgroundActor *self,
cairo_region_t *visible_region);
void meta_background_actor_screen_size_changed (MetaBackgroundActor *self);
#endif /* META_BACKGROUND_ACTOR_H */