diff --git a/libs/nativewindow/ANativeWindow.cpp b/libs/nativewindow/ANativeWindow.cpp
new file mode 100644
index 0000000..34c136a
--- /dev/null
+++ b/libs/nativewindow/ANativeWindow.cpp
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "ANativeWindow"
+
+#include <android/native_window.h>
+#include <system/window.h>
+
+void ANativeWindow_acquire(ANativeWindow* window) {
+    window->incStrong((void*)ANativeWindow_acquire);
+}
+
+void ANativeWindow_release(ANativeWindow* window) {
+    window->decStrong((void*)ANativeWindow_release);
+}
+
+static int32_t getWindowProp(ANativeWindow* window, int what) {
+    int value;
+    int res = window->query(window, what, &value);
+    return res < 0 ? res : value;
+}
+
+int32_t ANativeWindow_getWidth(ANativeWindow* window) {
+    return getWindowProp(window, NATIVE_WINDOW_WIDTH);
+}
+
+int32_t ANativeWindow_getHeight(ANativeWindow* window) {
+    return getWindowProp(window, NATIVE_WINDOW_HEIGHT);
+}
+
+int32_t ANativeWindow_getFormat(ANativeWindow* window) {
+    return getWindowProp(window, NATIVE_WINDOW_FORMAT);
+}
+
+int32_t ANativeWindow_setBuffersGeometry(ANativeWindow* window, int32_t width,
+        int32_t height, int32_t format) {
+    int32_t err = native_window_set_buffers_format(window, format);
+    if (!err) {
+        err = native_window_set_buffers_user_dimensions(window, width, height);
+        if (!err) {
+            int mode = NATIVE_WINDOW_SCALING_MODE_FREEZE;
+            if (width && height) {
+                mode = NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW;
+            }
+            err = native_window_set_scaling_mode(window, mode);
+        }
+    }
+    return err;
+}
+
+int32_t ANativeWindow_lock(ANativeWindow* window, ANativeWindow_Buffer* outBuffer,
+        ARect* inOutDirtyBounds) {
+    return window->perform(window, NATIVE_WINDOW_LOCK, outBuffer, inOutDirtyBounds);
+}
+
+int32_t ANativeWindow_unlockAndPost(ANativeWindow* window) {
+    return window->perform(window, NATIVE_WINDOW_UNLOCK_AND_POST);
+}