static ImageSurface showImageWithSelections(RGBImage img, final L<Rect> rects) {
  ret showImageWithSelections(img.getBufferedImage(), rects);
}

static ImageSurface showImageWithSelections(BufferedImage img, final L<Rect> rects) {
  ret showImageWithSelections(img, null, rects);
}

// for callers to use
static Var<Rect> showImageWithSelections_highlighted;

static ImageSurface showImageWithSelections(BufferedImage img, ImageSurface _is, final L<Rect> _rects) {
  final ImageSurface is = showImage(img, _is);
  final L<Rect> rects = cloneList(_rects);
  final new Var<Rect> highlighted;
  showImageWithSelections_highlighted = highlighted;
  final new Var<Rect> lastHighlighted;
  is.overlay = voidfunc(Graphics2D g) {
    for (Rect r : rects)
      is.drawSelectionRect(g, r.getRectangle(), Color.blue, Color.white);
    if (highlighted.has()) {
      g.setColor(Color.black);
      Rect r = scaleRect(highlighted.get(), is.getZoomX(), is.getZoomY());
      g.fillRect(r.x, r.y, r.w, r.h);
    }
  };
  imageSurfaceOnMouseMove(is, voidfunc(Pt p) {
    Rect h = null;
    if (p != null)
      for (Rect r : rects)
        if (r.contains(p)) {
          h = r;
          break;
        }
    if (neq(h, highlighted.get())) {
      highlighted.set(h);
      if (h != null) lastHighlighted.set(h);
      is.repaint();
    }
  });
  
  /*componentPopupMenu(is, voidfunc(JPopupMenu menu) {
    if (highlighted.has())
      addMenuItem(menu, "Send selection to " + snippetWithTitle("#1005726"), r {
        sendImageToProgram(clipBufferedImage(is.getImage(), lastHighlighted.get().getRectangle()), "#1005726");
      });
  });*/
  
  is.repaint();
  ret is;
}