static void
meta_window_group_paint (ClutterActor *actor)
{
cairo_region_t *clip_region;
cairo_region_t *unobscured_region;
ClutterActorIter iter;
ClutterActor *child;
cairo_rectangle_int_t visible_rect, clip_rect;
int paint_x_offset, paint_y_offset;
int paint_x_origin, paint_y_origin;
int actor_x_origin, actor_y_origin;
MetaWindowGroup *window_group = META_WINDOW_GROUP (actor);
MetaCompositor *compositor = window_group->screen->display->compositor;
ClutterActor *stage = CLUTTER_STAGE (compositor->stage);
/* Start off by treating all windows as completely unobscured, so damage anywhere
* in a window queues redraws, but confine it more below. */
clutter_actor_iter_init (&iter, actor);
while (clutter_actor_iter_next (&iter, &child))
{
if (META_IS_WINDOW_ACTOR (child))
{
MetaWindowActor *window_actor = META_WINDOW_ACTOR (child);
meta_window_actor_set_unobscured_region (window_actor, NULL);
}
}
/* Normally we expect an actor to be drawn at it's position on the screen.
* However, if we're inside the paint of a ClutterClone, that won't be the
* case and we need to compensate. We look at the position of the window
* group under the current model-view matrix and the position of the actor.
* If they are both simply integer translations, then we can compensate
* easily, otherwise we give up.
*
* Possible cleanup: work entirely in paint space - we can compute the
* combination of the model-view matrix with the local matrix for each child
* actor and get a total transformation for that actor for how we are
* painting currently, and never worry about how actors are positioned
* on the stage.
*/
if (!painting_untransformed (window_group, &paint_x_origin, &paint_y_origin) ||
!meta_actor_is_untransformed (actor, &actor_x_origin, &actor_y_origin))
{
CLUTTER_ACTOR_CLASS (meta_window_group_parent_class)->paint (actor);
return;
}
paint_x_offset = paint_x_origin - actor_x_origin;
paint_y_offset = paint_y_origin - actor_y_origin;
visible_rect.x = visible_rect.y = 0;
visible_rect.width = clutter_actor_get_width (stage);
visible_rect.height = clutter_actor_get_height (stage);
unobscured_region = cairo_region_create_rectangle (&visible_rect);
/* Get the clipped redraw bounds from Clutter so that we can avoid
* painting shadows on windows that don't need to be painted in this
* frame. In the case of a multihead setup with mismatched monitor
* sizes, we could intersect this with an accurate union of the
* monitors to avoid painting shadows that are visible only in the
* holes. */
clutter_stage_get_redraw_clip_bounds (stage, &clip_rect);
clip_region = cairo_region_create_rectangle (&clip_rect);
cairo_region_translate (clip_region, -paint_x_offset, -paint_y_offset);
gboolean has_unredirected_window = compositor->unredirected_window != NULL;
if (has_unredirected_window)
{
cairo_rectangle_int_t unredirected_rect;
MetaWindow *window = meta_window_actor_get_meta_window (compositor->unredirected_window);
meta_window_get_outer_rect (window, (MetaRectangle *)&unredirected_rect);
cairo_region_subtract_rectangle (unobscured_region, &unredirected_rect);
cairo_region_subtract_rectangle (clip_region, &unredirected_rect);
}
meta_window_group_cull_out (window_group,
CLUTTER_ACTOR (compositor->unredirected_window),
has_unredirected_window,
unobscured_region,
clip_region);
cairo_region_destroy (unobscured_region);
cairo_region_destroy (clip_region);
CLUTTER_ACTOR_CLASS (meta_window_group_parent_class)->paint (actor);
meta_window_group_reset_culling (window_group);
}
static void
meta_window_group_paint (ClutterActor *actor)
{
cairo_region_t *visible_region;
ClutterActor *stage;
cairo_rectangle_int_t visible_rect;
GList *children, *l;
int paint_x_origin, paint_y_origin;
int actor_x_origin, actor_y_origin;
int paint_x_offset, paint_y_offset;
MetaWindowGroup *window_group = META_WINDOW_GROUP (actor);
MetaCompScreen *info = meta_screen_get_compositor_data (window_group->screen);
/* Normally we expect an actor to be drawn at it's position on the screen.
* However, if we're inside the paint of a ClutterClone, that won't be the
* case and we need to compensate. We look at the position of the window
* group under the current model-view matrix and the position of the actor.
* If they are both simply integer translations, then we can compensate
* easily, otherwise we give up.
*
* Possible cleanup: work entirely in paint space - we can compute the
* combination of the model-view matrix with the local matrix for each child
* actor and get a total transformation for that actor for how we are
* painting currently, and never worry about how actors are positioned
* on the stage.
*/
if (!painting_untransformed (window_group, &paint_x_origin, &paint_y_origin) ||
!meta_actor_is_untransformed (actor, &actor_x_origin, &actor_y_origin))
{
CLUTTER_ACTOR_CLASS (meta_window_group_parent_class)->paint (actor);
return;
}
paint_x_offset = paint_x_origin - actor_x_origin;
paint_y_offset = paint_y_origin - actor_y_origin;
/* 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.
*/
children = clutter_actor_get_children (actor);
children = g_list_reverse (children);
/* Get the clipped redraw bounds from Clutter so that we can avoid
* painting shadows on windows that don't need to be painted in this
* frame. In the case of a multihead setup with mismatched monitor
* sizes, we could intersect this with an accurate union of the
* monitors to avoid painting shadows that are visible only in the
* holes. */
stage = clutter_actor_get_stage (actor);
clutter_stage_get_redraw_clip_bounds (CLUTTER_STAGE (stage),
&visible_rect);
visible_region = cairo_region_create_rectangle (&visible_rect);
if (info->unredirected_window != NULL)
{
cairo_rectangle_int_t unredirected_rect;
MetaWindow *window = meta_window_actor_get_meta_window (info->unredirected_window);
meta_window_get_outer_rect (window, (MetaRectangle *)&unredirected_rect);
cairo_region_subtract_rectangle (visible_region, &unredirected_rect);
}
for (l = children; l; l = l->next)
{
if (!CLUTTER_ACTOR_IS_VISIBLE (l->data))
continue;
if (l->data == info->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 (l->data))
continue;
if (META_IS_WINDOW_ACTOR (l->data))
{
MetaWindowActor *window_actor = l->data;
int x, y;
if (!meta_actor_is_untransformed (CLUTTER_ACTOR (window_actor), &x, &y))
continue;
x += paint_x_offset;
y += paint_y_offset;
/* Temporarily move to the coordinate system of the actor */
cairo_region_translate (visible_region, - x, - y);
meta_window_actor_set_visible_region (window_actor, visible_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 (visible_region, obscured_region);
}
meta_window_actor_set_visible_region_beneath (window_actor, visible_region);
cairo_region_translate (visible_region, x, y);
}
else if (META_IS_BACKGROUND_ACTOR (l->data) ||
META_IS_BACKGROUND_GROUP (l->data))
{
ClutterActor *background_actor = l->data;
int x, y;
if (!meta_actor_is_untransformed (CLUTTER_ACTOR (background_actor), &x, &y))
continue;
x += paint_x_offset;
y += paint_y_offset;
cairo_region_translate (visible_region, - x, - y);
if (META_IS_BACKGROUND_GROUP (background_actor))
meta_background_group_set_visible_region (META_BACKGROUND_GROUP (background_actor), visible_region);
else
meta_background_actor_set_visible_region (META_BACKGROUND_ACTOR (background_actor), visible_region);
cairo_region_translate (visible_region, x, y);
}
}
cairo_region_destroy (visible_region);
CLUTTER_ACTOR_CLASS (meta_window_group_parent_class)->paint (actor);
/* Now that we are done painting, unset the visible regions (they will
* mess up painting clones of our actors)
*/
for (l = children; l; l = l->next)
{
if (META_IS_WINDOW_ACTOR (l->data))
{
MetaWindowActor *window_actor = l->data;
meta_window_actor_reset_visible_regions (window_actor);
}
else if (META_IS_BACKGROUND_ACTOR (l->data))
{
MetaBackgroundActor *background_actor = l->data;
meta_background_actor_set_visible_region (background_actor, NULL);
}
}
g_list_free (children);
}
