static BufferedImage transparentBufferedImage(WidthAndHeight etc size) {
  BufferedImage img = new BufferedImage(size.w(), size.h(), BufferedImage.TYPE_INT_ARGB);
  Graphics2D g = getGraphics2D(img);
  g.setComposite(AlphaComposite.getInstance(AlphaComposite.CLEAR));
  g.fillRect(0, 0, size.w(), size.h());
  ret img;
}