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SF: Fix invalid reduction of transparent region from a layer. 

Reduce transparent region from a layer only if the transparent
region has valid intersection with the layer. Otherwise, reducing
a transparent region lying completely outside of the layer leads to
invalid sourcecrop values for the layer.

Change-Id: Iee9ba53a8072c21c9ba8a6d58cb14ca30f8600ba
CRs-Fixed: 620973
This commit is contained in:
radhakrishna 2014-02-21 10:01:08 +05:30 committed by Steve Kondik
parent bea57f312d
commit 5934c292ab
1 changed files with 3 additions and 1 deletions
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4
services/surfaceflinger/Layer.cpp
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@ -326,7 +326,9 @@ Rect Layer::reduce(const Rect& win, const Region& exclude) const{
if (CC_LIKELY(exclude.isEmpty())) {
return win;
}
if (exclude.isRect()) {
Rect tmp;
win.intersect(exclude.getBounds(), &tmp);
if (exclude.isRect() && !tmp.isEmpty()) {
return win.reduce(exclude.getBounds());
}
return Region(win).subtract(exclude).getBounds();