public Raster getRaster(int x, int y, int w, int h)
public Raster getRaster(int x, int y, int width, int height)
  public Raster getRaster(int x, int y, int w, int h)  {    // XXX Implement. Sun uses undocumented implementation class    // sun.awt.image.IntegerInterleavedRaster.    throw new Error("not implemented");  }