static Rect rect(int x, int y, int w, int h) {
  ret Rect(x, y, w, h);
}

static Rect rect(Pt p, int w, int h) {
  ret Rect(p.x, p.y, w, h);
}

static Rect rect(int w, int h) {
  ret Rect(0, 0, w, h);
}

ifclass BWImageAndRect
static Rect rect(BWImageAndRect r) { ret r == null ? null : r.rect; }
endif