[mutter/wip/carlosg/performance-improvements: 12/23] compositor: Use redraw clip region to cull out children

[Carlos Garnacho <carlosg src gnome org>]

commit c702e5da2a48fa33ab43285281e3d10dbabf8d3b
Author: Carlos Garnacho <carlosg gnome org>
Date:   Mon May 1 13:44:04 2017 +0200

    compositor: Use redraw clip region to cull out children
    
    This will avoid repainting too much of the background if the
    bounding box turned out to be too large.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=782344

 src/compositor/meta-window-group.c |    8 ++------
 1 files changed, 2 insertions(+), 6 deletions(-)
---
diff --git a/src/compositor/meta-window-group.c b/src/compositor/meta-window-group.c
index 4b90777..33ca056 100644
--- a/src/compositor/meta-window-group.c
+++ b/src/compositor/meta-window-group.c
@@ -57,7 +57,7 @@ meta_window_group_paint (ClutterActor *actor)
 {
   cairo_region_t *clip_region;
   cairo_region_t *unobscured_region;
-  cairo_rectangle_int_t visible_rect, clip_rect;
+  cairo_rectangle_int_t visible_rect;
   int paint_x_origin, paint_y_origin;
   int screen_width, screen_height;
 
@@ -109,11 +109,7 @@ meta_window_group_paint (ClutterActor *actor)
    * 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 (CLUTTER_STAGE (stage),
-                                        &clip_rect);
-
-  clip_region = cairo_region_create_rectangle (&clip_rect);
-
+  clip_region = clutter_stage_get_redraw_clip (CLUTTER_STAGE (stage));
   cairo_region_translate (clip_region, -paint_x_origin, -paint_y_origin);
 
   meta_cullable_cull_out (META_CULLABLE (window_group), unobscured_region, clip_region);