static void
meta_window_group_cull_out (MetaWindowGroup *group,
ClutterActor *unredirected_window,
gboolean has_unredirected_window,
cairo_region_t *unobscured_region,
cairo_region_t *clip_region)
{
ClutterActor *actor = CLUTTER_ACTOR (group);
ClutterActor *child;
ClutterActorIter iter;
/* We walk the list from top to bottom (opposite of painting order),
* and subtract the opaque area of each window out of the visible
* region that we pass to the windows below.
*/
clutter_actor_iter_init (&iter, actor);
while (clutter_actor_iter_prev (&iter, &child))
{
if (!CLUTTER_ACTOR_IS_VISIBLE (child))
continue;
if (has_unredirected_window && child == unredirected_window)
continue;
/* If an actor has effects applied, then that can change the area
* it paints and the opacity, so we no longer can figure out what
* portion of the actor is obscured and what portion of the screen
* it obscures, so we skip the actor.
*
* This has a secondary beneficial effect: if a ClutterOffscreenEffect
* is applied to an actor, then our clipped redraws interfere with the
* caching of the FBO - even if we only need to draw a small portion
* of the window right now, ClutterOffscreenEffect may use other portions
* of the FBO later. So, skipping actors with effects applied also
* prevents these bugs.
*
* Theoretically, we should check clutter_actor_get_offscreen_redirect()
* as well for the same reason, but omitted for simplicity in the
* hopes that no-one will do that.
*/
if (clutter_actor_has_effects (child))
continue;
if (META_IS_WINDOW_ACTOR (child))
{
MetaWindowActor *window_actor = META_WINDOW_ACTOR (child);
int x, y;
if (!meta_actor_is_untransformed (CLUTTER_ACTOR (window_actor), &x, &y))
continue;
/* Temporarily move to the coordinate system of the actor */
cairo_region_translate (unobscured_region, - x, - y);
cairo_region_translate (clip_region, - x, - y);
meta_window_actor_set_unobscured_region (window_actor, unobscured_region);
meta_window_actor_set_visible_region (window_actor, clip_region);
if (clutter_actor_get_paint_opacity (CLUTTER_ACTOR (window_actor)) == 0xff)
{
cairo_region_t *obscured_region = meta_window_actor_get_obscured_region (window_actor);
if (obscured_region)
{
cairo_region_subtract (unobscured_region, obscured_region);
cairo_region_subtract (clip_region, obscured_region);
}
}
meta_window_actor_set_visible_region_beneath (window_actor, clip_region);
cairo_region_translate (unobscured_region, x, y);
cairo_region_translate (clip_region, x, y);
}
else if (META_IS_BACKGROUND_ACTOR (child))
{
int x, y;
if (!meta_actor_is_untransformed (child, &x, &y))
continue;
cairo_region_translate (clip_region, - x, - y);
meta_background_actor_set_visible_region (META_BACKGROUND_ACTOR (child), clip_region);
cairo_region_translate (clip_region, x, y);
}
}
}
/**
* meta_cullable_cull_out_children:
* @cullable: The #MetaCullable
* @unobscured_region: The unobscured region, as passed into cull_out()
* @clip_region: The clip region, as passed into cull_out()
*
* This is a helper method for actors that want to recurse over their
* child actors, and cull them out.
*
* See #MetaCullable and meta_cullable_cull_out() for more details.
*/
void
meta_cullable_cull_out_children (MetaCullable *cullable,
cairo_region_t *unobscured_region,
cairo_region_t *clip_region)
{
ClutterActor *actor = CLUTTER_ACTOR (cullable);
ClutterActor *child;
ClutterActorIter iter;
clutter_actor_iter_init (&iter, actor);
while (clutter_actor_iter_prev (&iter, &child))
{
float x, y;
gboolean needs_culling;
if (!META_IS_CULLABLE (child))
continue;
needs_culling = (unobscured_region != NULL && clip_region != NULL);
if (needs_culling && !CLUTTER_ACTOR_IS_VISIBLE (child))
needs_culling = FALSE;
/* If an actor has effects applied, then that can change the area
* it paints and the opacity, so we no longer can figure out what
* portion of the actor is obscured and what portion of the screen
* it obscures, so we skip the actor.
*
* This has a secondary beneficial effect: if a ClutterOffscreenEffect
* is applied to an actor, then our clipped redraws interfere with the
* caching of the FBO - even if we only need to draw a small portion
* of the window right now, ClutterOffscreenEffect may use other portions
* of the FBO later. So, skipping actors with effects applied also
* prevents these bugs.
*
* Theoretically, we should check clutter_actor_get_offscreen_redirect()
* as well for the same reason, but omitted for simplicity in the
* hopes that no-one will do that.
*/
if (needs_culling && clutter_actor_has_effects (child))
needs_culling = FALSE;
if (needs_culling && !meta_actor_is_untransformed (child, NULL, NULL))
needs_culling = FALSE;
if (needs_culling)
{
clutter_actor_get_position (child, &x, &y);
/* Temporarily move to the coordinate system of the actor */
cairo_region_translate (unobscured_region, - x, - y);
cairo_region_translate (clip_region, - x, - y);
meta_cullable_cull_out (META_CULLABLE (child), unobscured_region, clip_region);
cairo_region_translate (unobscured_region, x, y);
cairo_region_translate (clip_region, x, y);
}
else
{
meta_cullable_cull_out (META_CULLABLE (child), NULL, NULL);
}
}
}
