diff --git a/include/ui/ISurface.h b/include/ui/ISurface.h
index 9a7383c..1c8043d 100644
--- a/include/ui/ISurface.h
+++ b/include/ui/ISurface.h
@@ -34,11 +34,56 @@
 
 class ISurface : public IInterface
 {
+protected:
+    enum {
+        REGISTER_BUFFERS = IBinder::FIRST_CALL_TRANSACTION,
+        UNREGISTER_BUFFERS,
+        POST_BUFFER, // one-way transaction
+        CREATE_OVERLAY,
+    };
+
 public: 
     DECLARE_META_INTERFACE(Surface);
 
-    virtual status_t registerBuffers(int w, int h, int hstride, int vstride,
-            PixelFormat format, const sp<IMemoryHeap>& heap) = 0;
+    
+    class BufferHeap {
+    public:
+        enum {
+            /* flip source image horizontally */
+            FLIP_H    = 0x01,
+            /* flip source image vertically */
+            FLIP_V    = 0x02,
+            /* rotate source image 90 degrees */
+            ROT_90    = 0x04,
+            /* rotate source image 180 degrees */
+            ROT_180   = 0x03,
+            /* rotate source image 270 degrees */
+            ROT_270   = 0x07,
+        };
+        BufferHeap();
+        
+        BufferHeap(uint32_t w, uint32_t h,
+                int32_t hor_stride, int32_t ver_stride, 
+                PixelFormat format, const sp<IMemoryHeap>& heap);
+        
+        BufferHeap(uint32_t w, uint32_t h,
+                int32_t hor_stride, int32_t ver_stride, 
+                PixelFormat format, uint32_t transform, uint32_t flags,
+                const sp<IMemoryHeap>& heap);
+        
+        ~BufferHeap(); 
+        
+        uint32_t w;
+        uint32_t h;
+        int32_t hor_stride;
+        int32_t ver_stride;
+        PixelFormat format;
+        uint32_t transform;
+        uint32_t flags;
+        sp<IMemoryHeap> heap;
+    };
+    
+    virtual status_t registerBuffers(const BufferHeap& buffers) = 0;
 
     virtual void postBuffer(ssize_t offset) = 0; // one-way