raboof / xrandr Goto Github PK

A XRRScreenResources contains multiple XRRModeInfo and RROutput (which with XRRGetOutputInfo() effectively means XRROutputInfo). Therefore, a screen can have many outputs which in turn, can have many modes. How does xrandr check what the active output and active mode is? It seems that it just assumes the first output and first mode found to be the active one.
In other words:

  XRRScreenResources *res = XRRGetScreenResources(display, default_root_window); 
  for (int i = 0; i < res->nmode; ++i) {
    XRRModeInfo *mode_info = &res->modes[i];
    // How do you verify this is the active rate?
    double rate = (double)mode_info->dotClock / ((double)mode_info->hTotal * (double)mode_info->vTotal));
  }