How to use

addTileObserver

method

in

java.awt.image.WritableRenderedImage

/**
 * Constructs a new instance of {@code DeferredPlanarImage}.
 *
 * @param source The source image.
 */
public DeferredPlanarImage(final RenderedImage source) {
  super(new ImageLayout(source), toVector(source), null);
  image = getSourceImage(0);
  image.addTileComputationListener(this);
  if (image instanceof WritableRenderedImage) {
    ((WritableRenderedImage) image).addTileObserver(this);
  }
  delay = (int) Math.min(DELAY * tileWidth * tileHeight / 1000000, DELAY);
}

/**
 * Constructs a new instance of {@code DeferredPlanarImage}.
 *
 * @param source The source image.
 */
public DeferredPlanarImage(final RenderedImage source) {
  super(new ImageLayout(source), toVector(source), null);
  image = getSourceImage(0);
  image.addTileComputationListener(this);
  if (image instanceof WritableRenderedImage) {
    ((WritableRenderedImage) image).addTileObserver(this);
  }
  delay = (int)Math.min((((long)DELAY) * (tileWidth*tileHeight) / 1000000), DELAY);
}