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.Program;
  import android.filterfw.format.ImageFormat;
  
  import java.lang.reflect.Field;
  
  /**
   * @hide
   */
  public abstract class SimpleImageFilter extends Filter {
  
      protected int mCurrentTarget = FrameFormat.TARGET_UNSPECIFIED;
      protected Program mProgram;
      protected String mParameterName;
  
      public SimpleImageFilter(String name, String parameterName) {
          super(name);
          mParameterName = parameterName;
      }
  
      @Override
      public void setupPorts() {
          if (mParameterName != null) {
              try {
                  Field programField = SimpleImageFilter.class.getDeclaredField("mProgram");
                  addProgramPort(mParameterName, mParameterName, programField, float.class, false);
              } catch (NoSuchFieldException e) {
                  throw new RuntimeException("Internal Error: mProgram field not found!");
              }
          }
          addMaskedInputPort("image", ImageFormat.create(ImageFormat.COLORSPACE_RGBA));
          addOutputBasedOnInput("image", "image");
      }
  
      @Override
      public FrameFormat getOutputFormat(String portName, FrameFormat inputFormat) {
          return inputFormat;
      }
  
      @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
          updateProgramWithTarget(inputFormat.getTarget(), context);
  
          // Process
          mProgram.process(input, output);
  
          // Push output
          pushOutput("image", output);
  
          // Release pushed frame
          output.release();
      }
  
      protected void updateProgramWithTarget(int target, FilterContext context) {
          if (target != mCurrentTarget) {
              switch (target) {
                  case FrameFormat.TARGET_NATIVE:
                      mProgram = getNativeProgram(context);
                      break;
  
                  case FrameFormat.TARGET_GPU:
                      mProgram = getShaderProgram(context);
                      break;
  
                  default:
                      mProgram = null;
                      break;
              }
              if (mProgram == null) {
                  throw new RuntimeException("Could not create a program for image filter " + this + "!");
              }
              initProgramInputs(mProgram, context);
              mCurrentTarget = target;
          }
      }
  
      protected abstract Program getNativeProgram(FilterContext context);
  
      protected abstract Program getShaderProgram(FilterContext context);
  }
  