static Rect scaleRect(Rect r, double factorX, double factorY) {
  ret rectFromPoints(
    iround(r.x*factorX),
    iround(r.y*factorY),
    iround(r.x2()*factorX),
    iround(r.y2()*factorY));
}

static Rect scaleRect(Rect r, double factor) {
  ret scaleRect(r, factor, factor);
}

static Rect scaleRect(double factor, Rect r) {
  ret scaleRect(r, factor);
}