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sclass VolatileImageSurfaceDemo is Swingable {
  new Timings timings;
  JLabel lblTimings = jlabel();
  JVolatileImageSurface surface;
  
  settable Renderable renderable = (g, w, h) -> {
    S mode = surface.volatileMode() ? " [vol]" : "";
    timings.do("background" + mode, -> {
      g.setColor(Color.green);
      g.fillRect(0, 0, w, h);
    });
    timings.do("circle" + mode, ->
      fillCircle(g, w/2, h/2, w/4, Color.blue));
  };
  
  visualize {
    surface = new JVolatileImageSurface(renderable);

    awtDoEvery(lblTimings, 1.0, -> lblTimings.setText(timings.toStringSingleLine()));
    
   JCheckBox cbVolatileMode = jCheckBox(true, "Use volatile image");
   onChangeAndNow(cbVolatileMode, -> surface.setVolatileMode(isChecked(cbVolatileMode)));
   
   ret northCenterAndSouthWithMargin(
     jcenteredline(cbVolatileMode),
     surface,
     lblTimings);
  }
}