static Rect shrinkRectLeftAndTop(Rect r, int pixels) {
  ret shrinkRectLeftAndTop(pixels, pixels, r);
}

static Rect shrinkRectLeftAndTop(int x, int y, Rect r) {
  ret Rect(r.x+x, r.y+y, r.w-x, r.h-y);
}

static Rect shrinkRectLeftAndTop(Rect r, int x, int y) {
  ret shrinkRectLeftAndTop(x, y, r);
}