code: public Image getRemoteImage (String url, int width, int height) {
      Exception error = new Exception(
        "Remote image loading not yet supported: " + url + "@" + width + "x" + height);
      ImageImpl image = createImage(false, width, height, url);
      image.fail(error);
      return image;
    }
docs: Asynchronously loads and returns the image at the specified URL. The width and height of the
  image will be the supplied {@code width} and {@code height} until the image is loaded.
  <em>Note:</em> on non-HTML platforms, this spawns a new thread for each loaded image. Thus,
  attempts to load large numbers of remote images simultaneously may result in poor performance.