Function AddCustomRefreshRates

src/settings_gui.cpp:164–172

* Add the refresh rate from the config and the refresh rates from all the monitors to * our list of refresh rates shown in the GUI. */

 * our list of refresh rates shown in the GUI.
 */
static void AddCustomRefreshRates()
{
	/* Add the refresh rate as selected in the config. */
	_refresh_rates.insert(_settings_client.gui.refresh_rate);

	/* Add all the refresh rates of all monitors connected to the machine.  */
	std::vector<int> monitor_rates = VideoDriver::GetInstance()->GetListOfMonitorRefreshRates();
	std::copy(monitor_rates.begin(), monitor_rates.end(), std::inserter(_refresh_rates, _refresh_rates.end()));
}

static const int SCALE_NMARKS = (MAX_INTERFACE_SCALE - MIN_INTERFACE_SCALE) / 25 + 1; // Show marks at 25% increments
static const int VOLUME_NMARKS = 9; // Show 5 values and 4 empty marks.