diff --git a/include/ui/egl/android_natives.h b/include/ui/egl/android_natives.h
index ca89b06..d59d72b 100644
--- a/include/ui/egl/android_natives.h
+++ b/include/ui/egl/android_natives.h
@@ -85,6 +85,7 @@
     NATIVE_WINDOW_SET_CROP,
     NATIVE_WINDOW_SET_BUFFER_COUNT,
     NATIVE_WINDOW_SET_BUFFERS_GEOMETRY,
+    NATIVE_WINDOW_SET_BUFFERS_TRANSFORM,
 };
 
 /* parameter for NATIVE_WINDOW_[DIS]CONNECT */
@@ -92,6 +93,20 @@
     NATIVE_WINDOW_API_EGL = 1
 };
 
+/* parameter for NATIVE_WINDOW_SET_BUFFERS_TRANSFORM */
+enum {
+    /* flip source image horizontally */
+    NATIVE_WINDOW_TRANSFORM_FLIP_H = HAL_TRANSFORM_FLIP_H ,
+    /* flip source image vertically */
+    NATIVE_WINDOW_TRANSFORM_FLIP_V = HAL_TRANSFORM_FLIP_V,
+    /* rotate source image 90 degrees clock-wise */
+    NATIVE_WINDOW_TRANSFORM_ROT_90 = HAL_TRANSFORM_ROT_90,
+    /* rotate source image 180 degrees */
+    NATIVE_WINDOW_TRANSFORM_ROT_180 = HAL_TRANSFORM_ROT_180,
+    /* rotate source image 270 degrees clock-wise */
+    NATIVE_WINDOW_TRANSFORM_ROT_270 = HAL_TRANSFORM_ROT_270,
+};
+
 struct ANativeWindow 
 {
 #ifdef __cplusplus
@@ -196,6 +211,7 @@
      *     NATIVE_WINDOW_SET_CROP
      *     NATIVE_WINDOW_SET_BUFFER_COUNT
      *     NATIVE_WINDOW_SET_BUFFERS_GEOMETRY
+     *     NATIVE_WINDOW_SET_BUFFERS_TRANSFORM
      *  
      */
     
@@ -298,6 +314,19 @@
             w, h, format);
 }
 
+/*
+ * native_window_set_buffers_transform(..., int transform)
+ * All buffers queued after this call will be displayed transformed according
+ * to the transform parameter specified.
+ */
+static inline int native_window_set_buffers_transform(
+        ANativeWindow* window,
+        int transform)
+{
+    return window->perform(window, NATIVE_WINDOW_SET_BUFFERS_TRANSFORM,
+            transform);
+}
+
 // ---------------------------------------------------------------------------
 
 /* FIXME: this is legacy for pixmaps */