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.base;
  
  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.GLFrame;
  import android.filterfw.format.ImageFormat;
  
  /**
   * @hide
   */
  public class GLTextureSource extends Filter {
  
      @GenerateFieldPort(name = "texId")
      private int mTexId;
  
      @GenerateFieldPort(name = "width")
      private int mWidth;
  
      @GenerateFieldPort(name = "height")
      private int mHeight;
  
      @GenerateFieldPort(name = "repeatFrame", hasDefault = true)
      private boolean mRepeatFrame = false;
  
      /* This timestamp will be used for all output frames from this source.  They
       * represent nanoseconds, and should be positive and monotonically
       * increasing.  Set to Frame.TIMESTAMP_UNKNOWN if timestamps are not
       * meaningful for these textures.
       */
      @GenerateFieldPort(name = "timestamp", hasDefault = true)
      private long mTimestamp = Frame.TIMESTAMP_UNKNOWN;
  
      private Frame mFrame;
  
      public GLTextureSource(String name) {
          super(name);
      }
  
      @Override
      public void setupPorts() {
          addOutputPort("frame", ImageFormat.create(ImageFormat.COLORSPACE_RGBA,
                                                    FrameFormat.TARGET_GPU));
      }
  
      @Override
      public void fieldPortValueUpdated(String name, FilterContext context) {
          // Release frame, so that it is recreated during the next process call
          if (mFrame != null) {
              mFrame.release();
              mFrame = null;
          }
      }
  
      @Override
      public void process(FilterContext context) {
          // Generate frame if not generated already
          if (mFrame == null) {
              FrameFormat outputFormat = ImageFormat.create(mWidth, mHeight,
                                                            ImageFormat.COLORSPACE_RGBA,
                                                            FrameFormat.TARGET_GPU);
              mFrame = context.getFrameManager().newBoundFrame(outputFormat,
                                                               GLFrame.EXISTING_TEXTURE_BINDING,
                                                               mTexId);
              mFrame.setTimestamp(mTimestamp);
          }
  
          // Push output
          pushOutput("frame", mFrame);
  
          if (!mRepeatFrame) {
              // Close output port as we are done here
              closeOutputPort("frame");
          }
      }
  
      @Override
      public void tearDown(FilterContext context) {
          if (mFrame != null) {
              mFrame.release();
          }
      }
  
  }
  