// TODO: hide on mouse over

static BlinkScreenArea blinkScreenArea(Rectangle r) {
  ret new BlinkScreenArea(r).go();
}

sclass BlinkScreenArea {
  int count, max = 12;
  int delay = 150;
  BufferedImage img, img2;
  JWindow window;
  JLabel lbl;
  Rectangle area;

  *(Rectangle r) ctex {
    // clip to screen
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize ();
    r = new Rectangle(screenSize).intersection(r);
    area = r;
  
    new Robot robot;
    img = robot.createScreenCapture(r);
    img2 = changeBrightness(img, 2f);
    img = changeBrightness(img, 0.5f);
  }

  BlinkScreenArea go() {
    awt {
      // make JWindow
      window = new JWindow;
      window.setBounds(area);
      lbl = new JLabel(new ImageIcon(img2));
      window.add(lbl);
      window.setAlwaysOnTop(true);
      window.setVisible(true);
      
      installTimer(lbl, delay, r { step(); });
    }
    ret this;
  }
  
  void step() {
    ++count;
    if (count > max)
      print("huh?");
    else if (count == max)
      window.dispose(); // should stop timer too
    else
      lbl.setIcon(new ImageIcon((count & 1) == 0 ? img : img2));
  }
}

Began life as a copy of #1003734