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fix copy back dirty region 

Copyback dirty region logic does copyback,
even when its not necessary causing 2ms delay.
Fix the logic to copy back only what is necessary

CRs-fixed: 562334
Change-Id: I52de68258ac9f87d704ee5401f93417805fa6773
This commit is contained in:
Omprakash Dhyade 2012-08-09 19:00:37 -07:00 committed by Linux Build Service Account
parent cfd539bf4a
commit 8760f1673e
1 changed files with 9 additions and 10 deletions
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19
libs/gui/Surface.cpp
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@ -1023,6 +1023,7 @@ status_t Surface::lock(
}
// figure out if we can copy the frontbuffer back
int backBufferSlot(getSlotFromBufferLocked(backBuffer.get()));
const sp<GraphicBuffer>& frontBuffer(mPostedBuffer);
const bool canCopyBack = (frontBuffer != 0 &&
backBuffer->width == frontBuffer->width &&
@ -1030,15 +1031,19 @@ status_t Surface::lock(
backBuffer->format == frontBuffer->format);
if (canCopyBack) {
// copy the area that is invalid and not repainted this round
const Region copyback(mDirtyRegion.subtract(newDirtyRegion));
Mutex::Autolock lock(mMutex);
Region oldDirtyRegion;
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);
} else {
// if we can't copy-back anything, modify the user's dirty
// region to make sure they redraw the whole buffer
newDirtyRegion.set(bounds);
mDirtyRegion.clear();
Mutex::Autolock lock(mMutex);
for (size_t i=0 ; i<NUM_BUFFER_SLOTS ; i++) {
mSlots[i].dirtyRegion.clear();
@ -1048,15 +1053,9 @@ status_t Surface::lock(
{ // scope for the lock
Mutex::Autolock lock(mMutex);
int backBufferSlot(getSlotFromBufferLocked(backBuffer.get()));
if (backBufferSlot >= 0) {
Region& dirtyRegion(mSlots[backBufferSlot].dirtyRegion);
mDirtyRegion.subtract(dirtyRegion);
dirtyRegion = newDirtyRegion;
}
mSlots[backBufferSlot].dirtyRegion = newDirtyRegion;
}
mDirtyRegion.orSelf(newDirtyRegion);
if (inOutDirtyBounds) {
*inOutDirtyBounds = newDirtyRegion.getBounds();
}