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.ShaderProgram;
  import android.filterfw.geometry.Quad;
  import android.filterfw.format.ImageFormat;
  import android.filterfw.format.ObjectFormat;
  
  /**
   * @hide
   */
  public class DrawOverlayFilter extends Filter {
  
      private ShaderProgram mProgram;
  
      public DrawOverlayFilter(String name) {
          super(name);
      }
  
      @Override
      public void setupPorts() {
          FrameFormat imageFormatMask = ImageFormat.create(ImageFormat.COLORSPACE_RGBA,
                                                           FrameFormat.TARGET_GPU);
          addMaskedInputPort("source", imageFormatMask);
          addMaskedInputPort("overlay", imageFormatMask);
          addMaskedInputPort("box", ObjectFormat.fromClass(Quad.class, FrameFormat.TARGET_SIMPLE));
          addOutputBasedOnInput("image", "source");
      }
  
      @Override
      public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
          return inputFormat;
      }
  
      @Override
      public void prepare(FilterContext context) {
          mProgram = ShaderProgram.createIdentity(context);
      }
  
      @Override
      public void process(FilterContext env) {
          // Get input frame
          Frame sourceFrame = pullInput("source");
          Frame overlayFrame = pullInput("overlay");
          Frame boxFrame = pullInput("box");
  
          // Get the box
          Quad box = (Quad)boxFrame.getObjectValue();
          box = box.translated(1.0f, 1.0f).scaled(2.0f);
  
          mProgram.setTargetRegion(box);
  
          // Create output frame with copy of input
          Frame output = env.getFrameManager().newFrame(sourceFrame.getFormat());
          output.setDataFromFrame(sourceFrame);
  
          // Draw onto output
          mProgram.process(overlayFrame, output);
  
          // Push output
          pushOutput("image", output);
  
          // Release pushed frame
          output.release();
      }
  }
  