diff --git a/services/surfaceflinger/BufferLayer.h b/services/surfaceflinger/BufferLayer.h
index 8158d6c..ba7431f 100644
--- a/services/surfaceflinger/BufferLayer.h
+++ b/services/surfaceflinger/BufferLayer.h
@@ -99,8 +99,8 @@
     // If there was a GL composition step rendering the previous frame, then
     // releaseFence will be populated with a native fence that fires when
     // composition has completed.
-    Region latchBuffer(bool& recomputeVisibleRegions, nsecs_t latchTime,
-                       const sp<Fence>& releaseFence) override;
+    bool latchBuffer(bool& recomputeVisibleRegions, nsecs_t latchTime,
+                     const sp<Fence>& releaseFence) override;
 
     bool isBufferLatched() const override { return mRefreshPending; }
 
@@ -137,7 +137,8 @@
     virtual bool getAutoRefresh() const = 0;
     virtual bool getSidebandStreamChanged() const = 0;
 
-    virtual std::optional<Region> latchSidebandStream(bool& recomputeVisibleRegions) = 0;
+    // Latch sideband stream and returns true if the dirty region should be updated.
+    virtual bool latchSidebandStream(bool& recomputeVisibleRegions) = 0;
 
     virtual bool hasFrameUpdate() const = 0;
 
@@ -179,6 +180,8 @@
 
     uint32_t mCurrentScalingMode{NATIVE_WINDOW_SCALING_MODE_FREEZE};
 
+    bool mTransformToDisplayInverse{false};
+
     // main thread.
     bool mBufferLatched{false}; // TODO: Use mActiveBuffer?