Commit Graph

2 Commits

Author SHA1 Message Date
Owen W. Taylor
f03d39eefb Check the opacity of the right actor
When determining if the window is opaque or not, look at it's opacity,
not the opacity of the window group.

Reported by Matthias Clasen
http://bugzilla.gnome.org/show_bug.cgi?id=591836
2009-08-14 15:58:07 -04:00
Owen W. Taylor
83f8bfd2ca Reduce overpaint in the window group
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
2009-07-09 16:56:01 +01:00