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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.camera;
     18 
     19 /**
     20  * The Java interface to JNI calls regarding mosaic preview rendering.
     21  *
     22  */
     23 public class MosaicRenderer
     24 {
     25      static
     26      {
     27          System.loadLibrary("jni_mosaic");
     28      }
     29 
     30      /**
     31       * Function to be called in onSurfaceCreated() to initialize
     32       * the GL context, load and link the shaders and create the
     33       * program. Returns a texture ID to be used for SurfaceTexture.
     34       *
     35       * @return textureID the texture ID of the newly generated texture to
     36       *          be assigned to the SurfaceTexture object.
     37       */
     38      public static native int init();
     39 
     40      /**
     41       * Pass the drawing surface's width and height to initialize the
     42       * renderer viewports and FBO dimensions.
     43       *
     44       * @param width width of the drawing surface in pixels.
     45       * @param height height of the drawing surface in pixels.
     46       * @param isLandscapeOrientation is the orientation of the activity layout in landscape.
     47       */
     48      public static native void reset(int width, int height, boolean isLandscapeOrientation);
     49 
     50      /**
     51       * Calling this function will render the SurfaceTexture to a new 2D texture
     52       * using the provided STMatrix.
     53       *
     54       * @param stMatrix texture coordinate transform matrix obtained from the
     55       *        Surface texture
     56       */
     57      public static native void preprocess(float[] stMatrix);
     58 
     59      /**
     60       * This function calls glReadPixels to transfer both the low-res and high-res
     61       * data from the GPU memory to the CPU memory for further processing by the
     62       * mosaicing library.
     63       */
     64      public static native void transferGPUtoCPU();
     65 
     66      /**
     67       * Function to be called in onDrawFrame() to update the screen with
     68       * the new frame data.
     69       */
     70      public static native void step();
     71 
     72      /**
     73       * Call this function when a new low-res frame has been processed by
     74       * the mosaicing library. This will tell the renderer library to
     75       * update its texture and warping transformation. Any calls to step()
     76       * after this call will use the new image frame and transformation data.
     77       */
     78      public static native void updateMatrix();
     79 
     80      /**
     81       * This function allows toggling between showing the input image data
     82       * (without applying any warp) and the warped image data. For running
     83       * the renderer as a viewfinder, we set the flag to false. To see the
     84       * preview mosaic, we set the flag to true.
     85       *
     86       * @param flag boolean flag to set the warping to true or false.
     87       */
     88      public static native void setWarping(boolean flag);
     89 }
     90