Program: 154092
Project: 154092
Buggy source:
/** 
 * Creates a new instance of <code>FormatOpImage</code> in the rendered layer.
 * @param args   The source image and data type
 * @param hints  Contains destination image layout.
 */
public RenderedImage create(ParameterBlock args,RenderingHints renderHints){
  RenderedImage src=args.getRenderedSource(0);
  Integer datatype=(Integer)args.getObjectParameter(0);
  int type=datatype.intValue();
  ImageLayout layout=RIFUtil.getImageLayoutHint(renderHints);
  if (layout == null && type == src.getSampleModel().getDataType()) {
    return src;
  }
  if (layout == null) {
    layout=new ImageLayout(src);
  }
 else {
    layout=(ImageLayout)layout.clone();
  }
  boolean isDataTypeChange=false;
  SampleModel sampleModel=layout.getSampleModel(src);
  if (sampleModel.getDataType() != type) {
    int tileWidth=layout.getTileWidth(src);
    int tileHeight=layout.getTileHeight(src);
    int numBands=src.getSampleModel().getNumBands();
    SampleModel csm=RasterFactory.createComponentSampleModel(sampleModel,type,tileWidth,tileHeight,numBands);
    layout.setSampleModel(csm);
    isDataTypeChange=true;
  }
  ColorModel colorModel=layout.getColorModel(null);
  if (colorModel != null && !JDKWorkarounds.areCompatibleDataModels(layout.getSampleModel(src),colorModel)) {
    layout.unsetValid(ImageLayout.COLOR_MODEL_MASK);
  }
  if (layout.getSampleModel(src) == src.getSampleModel() && layout.getMinX(src) == src.getMinX() && layout.getMinY(src) == src.getMinY() && layout.getWidth(src) == src.getWidth() && layout.getHeight(src) == src.getHeight() && layout.getTileWidth(src) == src.getTileWidth() && layout.getTileHeight(src) == src.getTileHeight() && layout.getTileGridXOffset(src) == src.getTileGridXOffset() && layout.getTileGridYOffset(src) == src.getTileGridYOffset()) {
    if (layout.getColorModel(src) == src.getColorModel()) {
      return src;
    }
 else {
      RenderingHints hints=renderHints;
      if (hints != null && hints.containsKey(JAI.KEY_TILE_CACHE)) {
        hints=new RenderingHints(renderHints);
        hints.remove(JAI.KEY_TILE_CACHE);
      }
      return new NullOpImage(src,layout,hints,OpImage.OP_IO_BOUND);
    }
  }
  if (isDataTypeChange == true) {
    if (renderHints == null) {
      renderHints=new RenderingHints(JAI.KEY_REPLACE_INDEX_COLOR_MODEL,Boolean.TRUE);
    }
 else     if (!renderHints.containsKey(JAI.KEY_REPLACE_INDEX_COLOR_MODEL)) {
      renderHints.put(JAI.KEY_REPLACE_INDEX_COLOR_MODEL,Boolean.TRUE);
    }
  }
  return new CopyOpImage(src,renderHints,layout);
}

Fixed version (ground truth):
/** 
 * Creates a new instance of <code>FormatOpImage</code> in the rendered layer.
 * @param args   The source image and data type
 * @param hints  Contains destination image layout.
 */
public RenderedImage create(ParameterBlock args,RenderingHints renderHints){
  RenderedImage src=args.getRenderedSource(0);
  Integer datatype=(Integer)args.getObjectParameter(0);
  int type=datatype.intValue();
  ImageLayout layout=RIFUtil.getImageLayoutHint(renderHints);
  if (layout == null && type == src.getSampleModel().getDataType()) {
    return src;
  }
  if (layout == null) {
    layout=new ImageLayout(src);
  }
 else {
    layout=(ImageLayout)layout.clone();
  }
  boolean isDataTypeChange=false;
  SampleModel sampleModel=layout.getSampleModel(src);
  if (sampleModel.getDataType() != type) {
    int tileWidth=layout.getTileWidth(src);
    int tileHeight=layout.getTileHeight(src);
    int numBands=src.getSampleModel().getNumBands();
    SampleModel csm=RasterFactory.createComponentSampleModel(sampleModel,type,tileWidth,tileHeight,numBands);
    layout.setSampleModel(csm);
    isDataTypeChange=true;
  }
  ColorModel colorModel=layout.getColorModel(null);
  if (colorModel != null && !JDKWorkarounds.areCompatibleDataModels(layout.getSampleModel(src),colorModel)) {
    layout.unsetValid(ImageLayout.COLOR_MODEL_MASK);
  }
  if (layout.getSampleModel(src) == src.getSampleModel() && layout.getMinX(src) == src.getMinX() && layout.getMinY(src) == src.getMinY() && layout.getWidth(src) == src.getWidth() && layout.getHeight(src) == src.getHeight() && layout.getTileWidth(src) == src.getTileWidth() && layout.getTileHeight(src) == src.getTileHeight() && layout.getTileGridXOffset(src) == src.getTileGridXOffset() && layout.getTileGridYOffset(src) == src.getTileGridYOffset()) {
    if (layout.getColorModel(src) == src.getColorModel()) {
      return src;
    }
 else {
      RenderingHints hints=renderHints;
      if (hints != null && hints.containsKey(JAI.KEY_TILE_CACHE)) {
        hints=new RenderingHints((Map)renderHints);
        hints.remove(JAI.KEY_TILE_CACHE);
      }
      return new NullOpImage(src,layout,hints,OpImage.OP_IO_BOUND);
    }
  }
  if (isDataTypeChange == true) {
    if (renderHints == null) {
      renderHints=new RenderingHints(JAI.KEY_REPLACE_INDEX_COLOR_MODEL,Boolean.TRUE);
    }
 else     if (!renderHints.containsKey(JAI.KEY_REPLACE_INDEX_COLOR_MODEL)) {
      renderHints.put(JAI.KEY_REPLACE_INDEX_COLOR_MODEL,Boolean.TRUE);
    }
  }
  return new CopyOpImage(src,renderHints,layout);
}