asclass JVolatileImageSurface > Surface {
  VolatileImageMakerForComponent volatileImageMaker;
  settable bool volatileMode = true;
  
  abstract void renderVolatile(int w, int h, Graphics2D g);
  
  @Override
  public void render(int w, int h, Graphics2D g) {
    if (!volatileMode)
      renderVolatile(w, h, g);
    else {
      if (volatileImageMaker == null || !volatileImageMaker.sizeIs(w, h))
        volatileImageMaker = new VolatileImageMakerForComponent(this, w, h,
          (_g, _w, _h) -> renderVolatile(_w, _h, _g));
          
      volatileImageMaker.paintOnScreen(g);
    }
  }
}