libgui: Copyback all region except dirty region for newly allocated buffer
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
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@ -1033,9 +1033,13 @@ status_t Surface::lock(
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if (canCopyBack) {
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Mutex::Autolock lock(mMutex);
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Region oldDirtyRegion;
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for(int i = 0 ; i < NUM_BUFFER_SLOTS; i++ ) {
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if(i != backBufferSlot && !mSlots[i].dirtyRegion.isEmpty())
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oldDirtyRegion.orSelf(mSlots[i].dirtyRegion);
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if(mSlots[backBufferSlot].dirtyRegion.isEmpty()) {
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oldDirtyRegion.set(bounds);
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} else {
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for(int i = 0 ; i < NUM_BUFFER_SLOTS; i++ ) {
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if(i != backBufferSlot && !mSlots[i].dirtyRegion.isEmpty())
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oldDirtyRegion.orSelf(mSlots[i].dirtyRegion);
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}
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}
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const Region copyback(oldDirtyRegion.subtract(newDirtyRegion));
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if (!copyback.isEmpty())
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