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. The rate is a property of
the mode. Because of this many-to-many relationship, how can I determine what
the active rate is?
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));
}
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