diff --git a/services/surfaceflinger/LayerBuffer.cpp b/services/surfaceflinger/LayerBuffer.cpp
index 87cabed..ccaad51 100644
--- a/services/surfaceflinger/LayerBuffer.cpp
+++ b/services/surfaceflinger/LayerBuffer.cpp
@@ -132,6 +132,14 @@
     LayerBase::unlockPageFlip(planeTransform, outDirtyRegion);    
 }
 
+void LayerBuffer::validateVisibility(const Transform& globalTransform)
+{
+    sp<Source> source(getSource());
+    if (source != 0)
+        source->onvalidateVisibility(globalTransform);
+    LayerBase::validateVisibility(globalTransform);
+}
+
 void LayerBuffer::drawForSreenShot() const
 {
     const DisplayHardware& hw(graphicPlane(0).displayHardware());
@@ -641,6 +649,11 @@
     }
 }
 
+void LayerBuffer::OverlaySource::onvalidateVisibility(const Transform&)
+{
+    mVisibilityChanged = true;
+}
+
 void LayerBuffer::OverlaySource::onVisibilityResolved(
         const Transform& planeTransform)
 {
diff --git a/services/surfaceflinger/LayerBuffer.h b/services/surfaceflinger/LayerBuffer.h
index fece858..a89d8fe 100644
--- a/services/surfaceflinger/LayerBuffer.h
+++ b/services/surfaceflinger/LayerBuffer.h
@@ -44,6 +44,7 @@
         virtual void onDraw(const Region& clip) const;
         virtual void onTransaction(uint32_t flags);
         virtual void onVisibilityResolved(const Transform& planeTransform);
+        virtual void onvalidateVisibility(const Transform& globalTransform) { }
         virtual void postBuffer(ssize_t offset);
         virtual void unregisterBuffers();
         virtual void destroy() { }
@@ -67,6 +68,7 @@
     virtual void drawForSreenShot() const;
     virtual uint32_t doTransaction(uint32_t flags);
     virtual void unlockPageFlip(const Transform& planeTransform, Region& outDirtyRegion);
+    virtual void validateVisibility(const Transform& globalTransform);
 
     status_t registerBuffers(const ISurface::BufferHeap& buffers);
     void postBuffer(ssize_t offset);
@@ -153,6 +155,7 @@
         virtual void onDraw(const Region& clip) const;
         virtual void onTransaction(uint32_t flags);
         virtual void onVisibilityResolved(const Transform& planeTransform);
+        virtual void onvalidateVisibility(const Transform& globalTransform);
         virtual void destroy();
     private: