content: /*
   * 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 android.filterpacks.imageproc;
  
  import android.filterfw.core.Filter;
  import android.filterfw.core.FilterContext;
  import android.filterfw.core.Frame;
  import android.filterfw.core.FrameFormat;
  import android.filterfw.core.GenerateFieldPort;
  import android.filterfw.core.Program;
  import android.filterfw.core.ShaderProgram;
  import android.filterfw.format.ImageFormat;
  import android.graphics.Bitmap;
  
  /**
   * @hide
   */
  public class BitmapOverlayFilter extends Filter {
  
      @GenerateFieldPort(name = "bitmap")
      private Bitmap mBitmap;
  
      @GenerateFieldPort(name = "tile_size", hasDefault = true)
      private int mTileSize = 640;
  
      private Program mProgram;
      private Frame mFrame;
  
      private int mTarget = FrameFormat.TARGET_UNSPECIFIED;
  
      private final String mOverlayShader =
              "precision mediump float;\n" +
              "uniform sampler2D tex_sampler_0;\n" +
              "uniform sampler2D tex_sampler_1;\n" +
              "varying vec2 v_texcoord;\n" +
              "void main() {\n" +
              "  vec4 original = texture2D(tex_sampler_0, v_texcoord);\n" +
              "  vec4 mask = texture2D(tex_sampler_1, v_texcoord);\n" +
              "  gl_FragColor = vec4(original.rgb * (1.0 - mask.a) + mask.rgb, 1.0);\n" +
              "}\n";
  
      public BitmapOverlayFilter(String name) {
          super(name);
      }
  
      @Override
      public void setupPorts() {
          addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA));
          addOutputBasedOnInput("image", "image");
      }
  
      @Override
      public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
          return inputFormat;
      }
  
      public void initProgram(FilterContext context, int target) {
          switch (target) {
              case FrameFormat.TARGET_GPU:
                  ShaderProgram shaderProgram = new ShaderProgram(context, mOverlayShader);
                  shaderProgram.setMaximumTileSize(mTileSize);
                  mProgram = shaderProgram;
                  break;
  
              default:
                  throw new RuntimeException("Filter FisheyeFilter does not support frames of " +
                      "target " + target + "!");
          }
          mTarget = target;
      }
  
      @Override
      public void tearDown(FilterContext context) {
          if (mFrame != null) {
              mFrame.release();
              mFrame = null;
          }
      }
  
      @Override
      public void process(FilterContext context) {
          // Get input frame
          Frame input = pullInput("image");
          FrameFormat inputFormat = input.getFormat();
  
          // Create output frame
          Frame output = context.getFrameManager().newFrame(inputFormat);
  
          // Create program if not created already
          if (mProgram == null || inputFormat.getTarget() != mTarget) {
              initProgram(context, inputFormat.getTarget());
          }
  
          if (mBitmap != null) {
              Frame frame = createBitmapFrame(context);
              // Process
              Frame[] inputs = {input, frame};
              mProgram.process(inputs, output);
  
              frame.release();
          } else {
              output.setDataFromFrame(input);
          }
  
          // Push output
          pushOutput("image", output);
  
          // Release pushed frame
          output.release();
      }
  
      private Frame createBitmapFrame(FilterContext context) {
          FrameFormat format = ImageFormat.create(mBitmap.getWidth(),
                                                  mBitmap.getHeight(),
                                                  ImageFormat.COLORSPACE_RGBA,
                                                  FrameFormat.TARGET_GPU);
  
          Frame frame = context.getFrameManager().newFrame(format);
          frame.setBitmap(mBitmap);
  
          mBitmap.recycle();
          mBitmap = null;
  
          return frame;
      }
  }
  