diff --git a/include/private/surfaceflinger/SharedBufferStack.h b/include/private/surfaceflinger/SharedBufferStack.h
index 3b9768b..6ace5bc 100644
--- a/include/private/surfaceflinger/SharedBufferStack.h
+++ b/include/private/surfaceflinger/SharedBufferStack.h
@@ -70,9 +70,9 @@
 // ----------------------------------------------------------------------------
 
 // 4 * (11 + 7 + (1 + 2*NUM_RECT_MAX) * NUM_BUFFER_MAX) * NUM_LAYERS_MAX
-// 4 * (11 + 7 + (1 + 2*6)*16) * 31
-// 904 * 31
-// = ~27 KiB (28024)
+// 4 * (11 + 7 + (1 + 2*7)*16) * 31
+// 1032 * 31
+// = ~27 KiB (31992)
 
 class SharedBufferStack
 {
@@ -82,21 +82,31 @@
     friend class SharedBufferServer;
 
 public:
-    struct FlatRegion { // 52 bytes = 4 * (1 + 2*N)
-        static const unsigned int NUM_RECT_MAX = 6;
-        uint32_t    count;
-        uint16_t    rects[4*NUM_RECT_MAX];
-    };
-    
     struct Statistics { // 4 longs
         typedef int32_t usecs_t;
         usecs_t  totalTime;
         usecs_t  reserved[3];
     };
+
+    struct SmallRect {
+        uint16_t l, t, r, b;
+    };
+
+    struct FlatRegion { // 52 bytes = 4 * (1 + 2*N)
+        static const unsigned int NUM_RECT_MAX = 6;
+        uint32_t    count;
+        SmallRect   rects[NUM_RECT_MAX];
+    };
+    
+    struct BufferData {
+        FlatRegion dirtyRegion;
+        SmallRect  crop;
+    };
     
     SharedBufferStack();
     void init(int32_t identity);
     status_t setDirtyRegion(int buffer, const Region& reg);
+    status_t setCrop(int buffer, const Rect& reg);
     Region getDirtyRegion(int buffer) const;
 
     // these attributes are part of the conditions/updates
@@ -113,7 +123,7 @@
     int32_t     reserved32[6];
     Statistics  stats;
     int32_t     reserved;
-    FlatRegion  dirtyRegion[NUM_BUFFER_MAX]; // 832 bytes
+    BufferData  buffers[NUM_BUFFER_MAX];     // 960 bytes
 };
 
 // ----------------------------------------------------------------------------
@@ -243,6 +253,7 @@
     status_t queue(int buf);
     bool needNewBuffer(int buffer) const;
     status_t setDirtyRegion(int buffer, const Region& reg);
+    status_t setCrop(int buffer, const Rect& reg);
     
 private:
     friend struct Condition;
diff --git a/include/surfaceflinger/ISurfaceFlingerClient.h b/include/surfaceflinger/ISurfaceFlingerClient.h
index d257645..c96432f 100644
--- a/include/surfaceflinger/ISurfaceFlingerClient.h
+++ b/include/surfaceflinger/ISurfaceFlingerClient.h
@@ -59,6 +59,9 @@
     
     virtual sp<IMemoryHeap> getControlBlock() const = 0;
 
+    /*
+     * Requires ACCESS_SURFACE_FLINGER permission
+     */
     virtual sp<ISurface> createSurface( surface_data_t* data,
                                         int pid, 
                                         const String8& name,
@@ -68,8 +71,14 @@
                                         PixelFormat format,
                                         uint32_t flags) = 0;
                                     
+    /*
+     * Requires ACCESS_SURFACE_FLINGER permission
+     */
     virtual status_t    destroySurface(SurfaceID sid) = 0;
 
+    /*
+     * Requires ACCESS_SURFACE_FLINGER permission
+     */
     virtual status_t    setState(int32_t count, const layer_state_t* states) = 0;
 };
 
diff --git a/include/surfaceflinger/Surface.h b/include/surfaceflinger/Surface.h
index 4c8d023..68809a9 100644
--- a/include/surfaceflinger/Surface.h
+++ b/include/surfaceflinger/Surface.h
@@ -215,10 +215,12 @@
     void dispatch_setUsage(va_list args);
     int  dispatch_connect(va_list args);
     int  dispatch_disconnect(va_list args);
+    int  dispatch_crop(va_list args);
     
     void setUsage(uint32_t reqUsage);
     int  connect(int api);
     int  disconnect(int api);
+    int  crop(Rect const* rect);
 
     uint32_t getUsage() const;
     int      getConnectedApi() const;
@@ -237,6 +239,7 @@
     Rect                        mSwapRectangle;
     uint32_t                    mUsage;
     int                         mConnected;
+    Rect                        mNextBufferCrop;
     
     // protected by mSurfaceLock. These are also used from lock/unlock
     // but in that case, they must be called form the same thread.
diff --git a/include/ui/egl/android_natives.h b/include/ui/egl/android_natives.h
index 773fd93..471c3c7 100644
--- a/include/ui/egl/android_natives.h
+++ b/include/ui/egl/android_natives.h
@@ -41,6 +41,14 @@
 
 struct android_native_buffer_t;
 
+typedef struct android_native_rect_t
+{
+    int32_t left;
+    int32_t top;
+    int32_t right;
+    int32_t bottom;
+} android_native_rect_t;
+
 // ---------------------------------------------------------------------------
 
 typedef struct android_native_base_t
@@ -63,15 +71,16 @@
 /* attributes queriable with query() */
 enum {
     NATIVE_WINDOW_WIDTH     = 0,
-    NATIVE_WINDOW_HEIGHT    = 1,
-    NATIVE_WINDOW_FORMAT    = 2,
+    NATIVE_WINDOW_HEIGHT,
+    NATIVE_WINDOW_FORMAT,
 };
 
 /* valid operations for the (*perform)() hook */
 enum {
     NATIVE_WINDOW_SET_USAGE  = 0,
-    NATIVE_WINDOW_CONNECT    = 1,
-    NATIVE_WINDOW_DISCONNECT = 2
+    NATIVE_WINDOW_CONNECT,
+    NATIVE_WINDOW_DISCONNECT,
+    NATIVE_WINDOW_SET_CROP,
 };
 
 /* parameter for NATIVE_WINDOW_[DIS]CONNECT */
@@ -125,7 +134,7 @@
      * 
      * Returns 0 on success or -errno on error.
      */
-    int     (*dequeueBuffer)(struct android_native_window_t* window, 
+    int     (*dequeueBuffer)(struct android_native_window_t* window,
                 struct android_native_buffer_t** buffer);
 
     /*
@@ -171,6 +180,7 @@
      *     NATIVE_WINDOW_SET_USAGE
      *     NATIVE_WINDOW_CONNECT
      *     NATIVE_WINDOW_DISCONNECT
+     *     NATIVE_WINDOW_SET_CROP
      *  
      */
     
@@ -221,6 +231,24 @@
     return window->perform(window, NATIVE_WINDOW_DISCONNECT, api);
 }
 
+/*
+ * native_window_set_crop(..., crop) sets which region of the next queued
+ * buffers needs to be considered.
+ * A buffer's crop region is scaled to match the surface's size.
+ *
+ * The specified crop region applies to all buffers queued after it is called.
+ *
+ * if 'crop' is NULL, subsequently queued buffers won't be cropped.
+ *
+ * An error is returned if for instance the crop region is invalid,
+ * out of the buffer's bound or if the window is invalid.
+ */
+static inline int native_window_set_crop(
+        android_native_window_t* window,
+        android_native_rect_t const * crop)
+{
+    return window->perform(window, NATIVE_WINDOW_SET_CROP, crop);
+}
 
 // ---------------------------------------------------------------------------