diff --git a/include/ui/FramebufferNativeWindow.h b/include/ui/FramebufferNativeWindow.h
index e72357a..cb9bf94 100644
--- a/include/ui/FramebufferNativeWindow.h
+++ b/include/ui/FramebufferNativeWindow.h
@@ -62,6 +62,7 @@
     static int dequeueBuffer(android_native_window_t* window, android_native_buffer_t** buffer);
     static int lockBuffer(android_native_window_t* window, android_native_buffer_t* buffer);
     static int queueBuffer(android_native_window_t* window, android_native_buffer_t* buffer);
+    static int query(android_native_window_t* window, int what, int* value);
     
     framebuffer_device_t* fbDev;
     alloc_device_t* grDev;
diff --git a/include/ui/Surface.h b/include/ui/Surface.h
index 8c4f63d..156d453 100644
--- a/include/ui/Surface.h
+++ b/include/ui/Surface.h
@@ -115,6 +115,8 @@
     sp<ISurface>                mSurface;
     SurfaceID                   mToken;
     uint32_t                    mIdentity;
+    uint32_t                    mWidth;
+    uint32_t                    mHeight;
     PixelFormat                 mFormat;
     uint32_t                    mFlags;
     mutable Mutex               mLock;
@@ -192,10 +194,12 @@
     static int dequeueBuffer(android_native_window_t* window, android_native_buffer_t** buffer);
     static int lockBuffer(android_native_window_t* window, android_native_buffer_t* buffer);
     static int queueBuffer(android_native_window_t* window, android_native_buffer_t* buffer);
+    static int query(android_native_window_t* window, int what, int* value);
 
     int dequeueBuffer(android_native_buffer_t** buffer);
     int lockBuffer(android_native_buffer_t* buffer);
     int queueBuffer(android_native_buffer_t* buffer);
+    int query(int what, int* value);
 
     status_t dequeueBuffer(sp<SurfaceBuffer>* buffer);
     status_t lockBuffer(const sp<SurfaceBuffer>& buffer);
@@ -209,6 +213,8 @@
     sp<SurfaceBuffer>           mLockedBuffer;
     SurfaceID                   mToken;
     uint32_t                    mIdentity;
+    uint32_t                    mWidth;
+    uint32_t                    mHeight;
     PixelFormat                 mFormat;
     uint32_t                    mFlags;
     mutable Region              mDirtyRegion;
diff --git a/include/ui/egl/android_natives.h b/include/ui/egl/android_natives.h
index 0398ea7..a3a1316 100644
--- a/include/ui/egl/android_natives.h
+++ b/include/ui/egl/android_natives.h
@@ -60,6 +60,12 @@
 
 // ---------------------------------------------------------------------------
 
+/* attributes queriable with query() */
+enum {
+    NATIVE_WINDOW_WIDTH     = 0,
+    NATIVE_WINDOW_HEIGHT    = 1
+};
+
 struct android_native_window_t 
 {
 #ifdef __cplusplus
@@ -129,8 +135,15 @@
     int     (*queueBuffer)(struct android_native_window_t* window,
                 struct android_native_buffer_t* buffer);
 
+    /*
+     * hook used to retrieve information about the native window.
+     * 
+     * Returns 0 on success or -errno on error.
+     */
+    int     (*query)(struct android_native_window_t* window,
+            int what, int* value);
     
-    void* reserved_proc[5];
+    void* reserved_proc[4];
 };
 
 // ---------------------------------------------------------------------------