sclass RandomScreenScan {
  int w, h;
  transient Rect lastSent;
  transient int stayMax;
  
  *() {}
  *(int *w, int *h) {}
  
  Rect get(bool foundSomething) {
    if (foundSomething && lastSent != null && stayMax++ < 10) ret lastSent;
    stayMax = 0;
    ret randomScreenRect(w, h);
  }
}