Fix the problem that mDamageGenerationId is a random value

1. mDamageGenerationId is a random value when initialized. When this random value happens to be equal to info.damageGenerationId, the dirty range will reach the maximum DIRTY_MAX.
2. When info.damageGenerationId is equal to 0, which is when the first frame of the APP is drawn, there is no need to reach the maximum DIRTY_MAX in the dirty range.

Bug: 321612817
Test: build

Change-Id: Iab6a04170926d10cdf2a62ae0fbf9cbe5eeb8bbf
Signed-off-by: qiubowen <qiubowen@xiaomi.com>

2 files changed, 2 insertions, 2 deletions

diff --git a/libs/hwui/RenderNode.cpp b/libs/hwui/RenderNode.cpp
index 1dd22cf43c5c..a733d1772757 100644
--- a/libs/hwui/RenderNode.cpp
+++ b/libs/hwui/RenderNode.cpp
@@ -218,7 +218,7 @@ void RenderNode::pushLayerUpdate(TreeInfo& info) {
  * stencil buffer may be needed. Views that use a functor to draw will be forced onto a layer.
  */
 void RenderNode::prepareTreeImpl(TreeObserver& observer, TreeInfo& info, bool functorsNeedLayer) {
-    if (mDamageGenerationId == info.damageGenerationId) {
+    if (mDamageGenerationId == info.damageGenerationId && mDamageGenerationId != 0) {
         // We hit the same node a second time in the same tree. We don't know the minimal
         // damage rect anymore, so just push the biggest we can onto our parent's transform
         // We push directly onto parent in case we are clipped to bounds but have moved position.
diff --git a/libs/hwui/RenderNode.h b/libs/hwui/RenderNode.h
index 572635a9bd45..4d03bf189a84 100644
--- a/libs/hwui/RenderNode.h
+++ b/libs/hwui/RenderNode.h
@@ -263,7 +263,7 @@ private:
     DisplayList mDisplayList;
     DisplayList mStagingDisplayList;
 
-    int64_t mDamageGenerationId;
+    int64_t mDamageGenerationId = 0;
 
     friend class AnimatorManager;
     AnimatorManager mAnimatorManager;