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Reduce overpaint in the window group

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When we are painting a stack of 5-10 maximized windows, the
standard bottom-to-top method of drawing every actor results
in a tremendous amount of overdraw and can easily max out
the available memory bandwidth on a low-end* graphics chipset.
It's even worse if window textures are being accessed over
the AGP bus.

When we have opaque windows, we can go ahead and compute visibility
ourselves (in classic X-server fashion) and use that information to
restrict drawing obscured actors.

* Add MutterWindowGroup - a ClutterGroup subclass with logic
  for figuring out obscured regions.

* Add mutter_window_get_obscured_region() to get the region
  obscured by that window.

* Add mutter_shaped_texture_set_clip_region() to hint
  a clip region to the painting code; this is set based on
  the computed visible region of MutterWindowGroup.

* Add tidy_texture_frame_set_needs_paint() to hint that the
  paint can be skipped entirely; this is used when we detect
  that the window shadow is entirely obscured.

http://bugzilla.gnome.org/show_bug.cgi?id=587344
This commit is contained in:
Owen W. Taylor
2009-06-29 14:30:26 -04:00
parent a454ad5c41
commit 83f8bfd2ca
10 changed files with 664 additions and 44 deletions
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9
src/compositor/mutter-window-private.h
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@@ -4,6 +4,7 @@
#define MUTTER_WINDOW_PRIVATE_H
#include <X11/extensions/Xdamage.h>
#include <gdk/gdk.h>
#include "compositor-mutter.h"
MutterWindow *mutter_window_new (MetaWindow *window);
@@ -36,6 +37,14 @@ void mutter_window_update_opacity (MutterWindow *cw);
void mutter_window_mapped (MutterWindow *cw);
void mutter_window_unmapped (MutterWindow *cw);
GdkRegion *mutter_window_get_obscured_region (MutterWindow *cw);
void mutter_window_set_visible_region (MutterWindow *cw,
GdkRegion *visible_region);
void mutter_window_set_visible_region_beneath (MutterWindow *cw,
GdkRegion *beneath_region);
void mutter_window_reset_visible_regions (MutterWindow *cw);
void mutter_window_effect_completed (MutterWindow *actor,
gulong event);