diff --git a/services/surfaceflinger/Layer.h b/services/surfaceflinger/Layer.h
index 25afeef..e9eab17 100644
--- a/services/surfaceflinger/Layer.h
+++ b/services/surfaceflinger/Layer.h
@@ -68,7 +68,7 @@
     status_t setBuffers(uint32_t w, uint32_t h, 
             PixelFormat format, uint32_t flags=0);
 
-    bool isFixedSize() const;
+    virtual bool isFixedSize() const;
 
     // LayerBase interface
     virtual void setGeometry(const sp<const DisplayDevice>& hw,
diff --git a/services/surfaceflinger/LayerDim.cpp b/services/surfaceflinger/LayerDim.cpp
index 24ad706..f8c4139 100644
--- a/services/surfaceflinger/LayerDim.cpp
+++ b/services/surfaceflinger/LayerDim.cpp
@@ -34,7 +34,7 @@
 // ---------------------------------------------------------------------------
 
 LayerDim::LayerDim(SurfaceFlinger* flinger, const sp<Client>& client)
-    : LayerBase(flinger, client)
+    : Layer(flinger, client)
 {
 }
 
@@ -71,6 +71,25 @@
     }
 }
 
+sp<ISurface> LayerDim::createSurface()
+{
+    class BSurface : public BnSurface, public LayerCleaner {
+        virtual sp<IGraphicBufferProducer> getSurfaceTexture() const { return 0; }
+    public:
+        BSurface(const sp<SurfaceFlinger>& flinger,
+                const sp<LayerBase>& layer)
+            : LayerCleaner(flinger, layer) { }
+    };
+    sp<ISurface> sur(new BSurface(mFlinger, this));
+    return sur;
+}
+
+bool LayerDim::isVisible() const {
+    const Layer::State& s(mDrawingState);
+    return !(s.flags & layer_state_t::eLayerHidden) && s.alpha;
+}
+
+
 // ---------------------------------------------------------------------------
 
 }; // namespace android
diff --git a/services/surfaceflinger/LayerDim.h b/services/surfaceflinger/LayerDim.h
index 5cdfafc..e1ea9bd 100644
--- a/services/surfaceflinger/LayerDim.h
+++ b/services/surfaceflinger/LayerDim.h
@@ -23,13 +23,13 @@
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
 
-#include "LayerBase.h"
+#include "Layer.h"
 
 // ---------------------------------------------------------------------------
 
 namespace android {
 
-class LayerDim : public LayerBase
+class LayerDim : public Layer
 {
 public:    
                 LayerDim(SurfaceFlinger* flinger, const sp<Client>& client);
@@ -41,6 +41,10 @@
     virtual bool isProtectedByApp() const { return false; }
     virtual bool isProtectedByDRM() const { return false; }
     virtual const char* getTypeId() const { return "LayerDim"; }
+
+    virtual bool isFixedSize() const      { return true; }
+    virtual bool isVisible() const;
+    virtual sp<ISurface> createSurface();
 };
 
 // ---------------------------------------------------------------------------