!7

static ScreenLens lens;
static RGBImage lastImage;
static Rect diffRect;

p-noconsole {
  lens = new ScreenLens;
  lens.postProcess = func(BufferedImage img) {
    RGBImage rgb = new(img);
    if (lastImage != null) {
      diffRect = or(rectOfDifferentPixels(lastImage, rgb), diffRect);
      drawBox(img, diffRect, Color.red, 0.8f);
    }
    lastImage = rgb;
    ret img;
  };
  lens.start();
}