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libgui: Copyback all region except dirty region for newly allocated buffer

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Inside Surface::lock if new buffer is allocated
and DirtyRegion does not cover complete buffer
bounds then copyback may not cover all remaining area
as it copyback only area covered by dirty regions
from other buffers. This will lead to left out
black area which may cause flicker.

Change-Id: I4a3f7a56fc5fbaf4af926584919577d8d34bed57
This commit is contained in:
Baldev Sahu 2015-01-23 14:00:34 +05:30 committed by Linux Build Service Account
parent 8760f1673e
commit a1288c979d
1 changed files with 7 additions and 3 deletions
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4
libs/gui/Surface.cpp
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@ -1033,10 +1033,14 @@ status_t Surface::lock(
if (canCopyBack) {
Mutex::Autolock lock(mMutex);
Region oldDirtyRegion;
if(mSlots[backBufferSlot].dirtyRegion.isEmpty()) {
oldDirtyRegion.set(bounds);
} else {
for(int i = 0 ; i < NUM_BUFFER_SLOTS; i++ ) {
if(i != backBufferSlot && !mSlots[i].dirtyRegion.isEmpty())
oldDirtyRegion.orSelf(mSlots[i].dirtyRegion);
}
}
const Region copyback(oldDirtyRegion.subtract(newDirtyRegion));
if (!copyback.isEmpty())
copyBlt(backBuffer, frontBuffer, copyback);