Fix wrong surfaceRequiresRedraw check

We only need to redraw if the size /changed/ not
if it was the same. Also fix damageId to not use
frameNumber as repeated redraws of the same frame
would toggle.

Bug: 143711430
Test: systrace
Change-Id: I8ac4629c9ff4fd51de33d1be7aa46ccc995ba342

libs/hwui/TreeInfo.cpp

@@ -24,7 +24,6 @@ TreeInfo::TreeInfo(TraversalMode mode, renderthread::CanvasContext& canvasContex
         : mode(mode)
         , prepareTextures(mode == MODE_FULL)
         , canvasContext(canvasContext)
-        , damageGenerationId(canvasContext.getFrameNumber())
         , disableForceDark(canvasContext.useForceDark() ? 0 : 1)
         , screenSize(canvasContext.getNextFrameSize()) {}
 

libs/hwui/renderthread/CanvasContext.cpp

@@ -303,6 +303,7 @@ void CanvasContext::prepareTree(TreeInfo& info, int64_t* uiFrameInfo, int64_t sy
 
     info.damageAccumulator = &mDamageAccumulator;
     info.layerUpdateQueue = &mLayerUpdateQueue;
+    info.damageGenerationId = mDamageId++;
     info.out.canDrawThisFrame = true;
 
     mAnimationContext->startFrame(info.mode);
@@ -702,7 +703,7 @@ bool CanvasContext::surfaceRequiresRedraw() {
     surface->query(NATIVE_WINDOW_WIDTH, &width);
     surface->query(NATIVE_WINDOW_HEIGHT, &height);
 
-    return width == mLastFrameWidth && height == mLastFrameHeight;
+    return width != mLastFrameWidth || height != mLastFrameHeight;
 }
 
 void CanvasContext::setRenderAheadDepth(int renderAhead) {

libs/hwui/renderthread/CanvasContext.h

@@ -245,6 +245,7 @@ private:
     // Need at least 4 because we do quad buffer. Add a 5th for good measure.
     RingBuffer<SwapHistory, 5> mSwapHistory;
     int64_t mFrameNumber = -1;
+    int64_t mDamageId = 0;
 
     // last vsync for a dropped frame due to stuffed queue
     nsecs_t mLastDropVsync = 0;