BackgroundEffectHelper: keep a cached version of blur geometries

Now the blurred geometries are saved in a list that gets updated only when they change, this allows to reduce a lot the cost of GetBlurGeometries that now only returns a const reference of the actual vector. Improved also HasEnabledHelpers (no helper can be registered if it's not enabled). (bzr r3347.5.20)

1 files changed, 1 insertions, 2 deletions

diff --git a/plugins/unityshell/src/unityshell.cpp b/plugins/unityshell/src/unityshell.cpp
index 9ec2ae919..a1a4ff3c5 100644
--- a/plugins/unityshell/src/unityshell.cpp
+++ b/plugins/unityshell/src/unityshell.cpp
@@ -777,9 +777,8 @@ void UnityScreen::paintDisplay()
 /* We are using a CompRegion here so that we can combine rectangles
 * where it might make sense to. Saves calls into OpenGL */
 CompRegion blur_region;
- auto const& blur_geometries = BackgroundEffectHelper::GetBlurGeometries();
 
- for (auto const& blur_geometry : blur_geometries)
+ for (auto const& blur_geometry : BackgroundEffectHelper::GetBlurGeometries())
 {
 auto blur_rect = CompRectFromNuxGeo(blur_geometry);
 blur_region += (blur_rect & *output);