Add a callback for rendernode parentcount=0
Bug: 27709981
Fixes: 22565656
Change-Id: I1cb4461baf9069dc4e7ca6de10d5862578c107f4
diff --git a/libs/hwui/TreeInfo.h b/libs/hwui/TreeInfo.h
index accd303..a43e544 100644
--- a/libs/hwui/TreeInfo.h
+++ b/libs/hwui/TreeInfo.h
@@ -32,6 +32,7 @@
class DamageAccumulator;
class LayerUpdateQueue;
class OpenGLRenderer;
+class RenderNode;
class RenderState;
class ErrorHandler {
@@ -41,6 +42,17 @@
~ErrorHandler() {}
};
+class TreeObserver {
+public:
+ // Called when a RenderNode's parent count hits 0.
+ // Due to the unordered nature of tree pushes, once prepareTree
+ // is finished it is possible that the node was "resurrected" and has
+ // a non-zero parent count.
+ virtual void onMaybeRemovedFromTree(RenderNode* node) {}
+protected:
+ ~TreeObserver() {}
+};
+
// This would be a struct, but we want to PREVENT_COPY_AND_ASSIGN
class TreeInfo {
PREVENT_COPY_AND_ASSIGN(TreeInfo);
@@ -86,6 +98,10 @@
#endif
ErrorHandler* errorHandler = nullptr;
+ // Optional, may be nullptr. Used to allow things to observe interesting
+ // tree state changes
+ TreeObserver* observer = nullptr;
+
// Frame number for use with synchronized surfaceview position updating
int64_t frameNumber = -1;
int32_t windowInsetLeft = 0;