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diff --git a/src/com/android/camera/MosaicRenderer.java b/src/com/android/camera/MosaicRenderer.java
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+++ b/src/com/android/camera/MosaicRenderer.java
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+/*
+ * Copyright (C) 2011 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.
+ */
+
+package com.android.camera;
+
+/**
+ * The Java interface to JNI calls regarding mosaic preview rendering.
+ *
+ */
+public class MosaicRenderer
+{
+     static
+     {
+         System.loadLibrary("jni_mosaic");
+     }
+
+     /**
+      * Function to be called in onSurfaceCreated() to initialize
+      * the GL context, load and link the shaders and create the
+      * program. Returns a texture ID to be used for SurfaceTexture.
+      *
+      * @return textureID the texture ID of the newly generated texture to
+      *          be assigned to the SurfaceTexture object.
+      */
+     public static native int init();
+
+     /**
+      * Pass the drawing surface's width and height to initialize the
+      * renderer viewports and FBO dimensions.
+      *
+      * @param width width of the drawing surface in pixels.
+      * @param height height of the drawing surface in pixels.
+      * @param isLandscapeOrientation is the orientation of the activity layout in landscape.
+      */
+     public static native void reset(int width, int height, boolean isLandscapeOrientation);
+
+     /**
+      * Calling this function will render the SurfaceTexture to a new 2D texture
+      * using the provided STMatrix.
+      *
+      * @param stMatrix texture coordinate transform matrix obtained from the
+      *        Surface texture
+      */
+     public static native void preprocess(float[] stMatrix);
+
+     /**
+      * This function calls glReadPixels to transfer both the low-res and high-res
+      * data from the GPU memory to the CPU memory for further processing by the
+      * mosaicing library.
+      */
+     public static native void transferGPUtoCPU();
+
+     /**
+      * Function to be called in onDrawFrame() to update the screen with
+      * the new frame data.
+      */
+     public static native void step();
+
+     /**
+      * Call this function when a new low-res frame has been processed by
+      * the mosaicing library. This will tell the renderer library to
+      * update its texture and warping transformation. Any calls to step()
+      * after this call will use the new image frame and transformation data.
+      */
+     public static native void updateMatrix();
+
+     /**
+      * This function allows toggling between showing the input image data
+      * (without applying any warp) and the warped image data. For running
+      * the renderer as a viewfinder, we set the flag to false. To see the
+      * preview mosaic, we set the flag to true.
+      *
+      * @param flag boolean flag to set the warping to true or false.
+      */
+     public static native void setWarping(boolean flag);
+}