Swing/RatingLabel のバックアップ(No.15)

private final ImageProducer ip = orgIcon.getImage().getSource();
private ImageIcon makeStarImageIcon(float[] filter) {
  SelectedImageFilter sif = new SelectedImageFilter(filter);
  return new ImageIcon(
    createImage(new FilteredImageSource(ip, sif)));
}
private class SelectedImageFilter extends RGBImageFilter {
  private final float[] filter;
  public SelectedImageFilter(float[] arrays) {
    filter = new float[arrays.length];
    System.arraycopy(arrays, 0, filter, 0, arrays.length);
    canFilterIndexColorModel = false;
  }
  @Override public int filterRGB(int x, int y, int argb) {
    int r = (int) (((argb >> 16) & 0xff) * filter[0]);
    int g = (int) (((argb >>  8) & 0xff) * filter[1]);
    int b = (int) (((argb      ) & 0xff) * filter[2]);
    return (argb & 0xff000000) | (r << 16) | (g << 8) | (b);
  }
}