static BufferedImage clipBufferedImage(BufferedImage src, Rectangle clip) {
  ret clipBufferedImage(src, new Rect(clip));
}

static BufferedImage clipBufferedImage(BufferedImage src, Rect r) {
  if (src == null) null;
  // fixClipRect
  r = rectIntersect(r, new Rect(0, 0, src.getWidth(), src.getHeight()));
  if (rectEmpty(r))
    r = new Rect(0, 0, 0, 0);
    
  ret src.getSubimage(r.x, r.y, r.width, r.height);
}

static BufferedImage clipBufferedImage(BufferedImage src, int x, int y, int w, int h) {
  ret clipBufferedImage(src, Rect(x, y, w, h));
}