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kwin/blur: consider the valid part of the cache as being opaque

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This reduces the repaints in cases where several blur regions are
stacked on top of each other (e.g. oxygen-transparent) and the topmost
layer needs to be updated (e.g. a blurry window is moved).
This commit is contained in:
Philipp Knechtges 2012-02-19 01:19:32 +01:00
parent f3117f1038
commit 999d64bb19
1 changed files with 3 additions and 0 deletions
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3
effects/blur/blur.cpp
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@ -311,6 +311,9 @@ void BlurEffect::prePaintWindow(EffectWindow* w, WindowPrePaintData& data, int t
// In case we already have a texture cache mark the dirty regions invalid.
it->damagedRegion &= expandedBlur;
it->damagedRegion |= damagedCache;
// The valid part of the cache can be considered as being opaque
// as long as we don't need to update a bordering part
data.clip |= blurArea - expand(it->damagedRegion);
it->dropCache = false;
}
// we keep track of the "damage propagation"