private void InitBuffers()
{
// query active paths from the current computer.
int result = CCDWrapper.GetDisplayConfigBufferSizes(CCDWrapper.QueryDisplayFlags.OnlyActivePaths, out _numPathArrayElements, out _numModeInfoArrayElements);
if (result != 0)
{
ServiceRegistration.Get <ILogger>().Error("RefreshRateChanger: GetDisplayConfigBufferSizes(...) returned {0}", result);
return;
}
_pathInfoArray = new CCDWrapper.DisplayConfigPathInfo[_numPathArrayElements];
_modeInfoArray = new CCDWrapper.DisplayConfigModeInfo[_numModeInfoArrayElements];
// Get display configuration
result = CCDWrapper.QueryDisplayConfig(CCDWrapper.QueryDisplayFlags.OnlyActivePaths, ref _numPathArrayElements, _pathInfoArray, ref _numModeInfoArrayElements, _modeInfoArray, IntPtr.Zero);
if (result != 0)
{
ServiceRegistration.Get <ILogger>().Error("RefreshRateChanger: QueryDisplayConfig(...) returned {0}", result);
return;
}
_initialized = true;
}
public bool SetRefreshRate(double refreshRate)
{
if (!_initialized)
{
return(false);
}
// Set proper numerator and denominator for refresh rate
UInt32 newRefreshRate = (uint)(refreshRate * 1000);
UInt32 numerator;
UInt32 denominator;
CCDWrapper.DisplayConfigScanLineOrdering scanLineOrdering;
switch (newRefreshRate)
{
case 23976:
numerator = 24000;
denominator = 1001;
scanLineOrdering = CCDWrapper.DisplayConfigScanLineOrdering.Progressive;
break;
case 24000:
numerator = 24000;
denominator = 1000;
scanLineOrdering = CCDWrapper.DisplayConfigScanLineOrdering.Progressive;
break;
case 25000:
numerator = 25000;
denominator = 1000;
scanLineOrdering = CCDWrapper.DisplayConfigScanLineOrdering.Progressive;
break;
case 29970:
numerator = 30000;
denominator = 1001;
scanLineOrdering = CCDWrapper.DisplayConfigScanLineOrdering.Progressive;
break;
case 30000:
numerator = 30000;
denominator = 1000;
scanLineOrdering = CCDWrapper.DisplayConfigScanLineOrdering.Progressive;
break;
case 50000:
numerator = 50000;
denominator = 1000;
scanLineOrdering = CCDWrapper.DisplayConfigScanLineOrdering.Progressive;
break;
case 59940:
numerator = 60000;
denominator = 1001;
scanLineOrdering = CCDWrapper.DisplayConfigScanLineOrdering.Progressive;
break;
case 60000:
numerator = 60000;
denominator = 1000;
scanLineOrdering = CCDWrapper.DisplayConfigScanLineOrdering.Progressive;
break;
default:
numerator = newRefreshRate / 1000;
denominator = 1;
scanLineOrdering = CCDWrapper.DisplayConfigScanLineOrdering.Progressive;
break;
}
// Set refresh rate parameters in display config
var modeIndex = _displayIndex * 2; // Array always contains "Source" and "Target" per display
_modeInfoArray[modeIndex].TargetMode.TargetVideoSignalInfo.VerticalSyncFreq.Numerator = numerator;
_modeInfoArray[modeIndex].TargetMode.TargetVideoSignalInfo.VerticalSyncFreq.Denominator = denominator;
_modeInfoArray[modeIndex].TargetMode.TargetVideoSignalInfo.ScanLineOrdering = scanLineOrdering;
// Validate new refresh rate
CCDWrapper.SdcFlags flags = CCDWrapper.SdcFlags.Validate | CCDWrapper.SdcFlags.UseSuppliedDisplayConfig;
long result = CCDWrapper.SetDisplayConfig(_numPathArrayElements, _pathInfoArray, _numModeInfoArrayElements, _modeInfoArray, flags);
// Adding SDC_ALLOW_CHANGES to flags if validation failed
if (result != 0)
{
ServiceRegistration.Get <ILogger>().Debug("RefreshRateChanger.SetDisplayConfig(...): SDC_VALIDATE of {0}/{1} failed", numerator, denominator);
flags = CCDWrapper.SdcFlags.Apply | CCDWrapper.SdcFlags.UseSuppliedDisplayConfig | CCDWrapper.SdcFlags.AllowChanges;
}
else
{
ServiceRegistration.Get <ILogger>().Debug("RefreshRateChanger.SetDisplayConfig(...): SDC_VALIDATE of {0}/{1} succesful", numerator, denominator);
flags = CCDWrapper.SdcFlags.Apply | CCDWrapper.SdcFlags.UseSuppliedDisplayConfig;
}
// Configuring display
result = CCDWrapper.SetDisplayConfig(_numPathArrayElements, _pathInfoArray, _numModeInfoArrayElements, _modeInfoArray, flags);
if (result != 0)
{
ServiceRegistration.Get <ILogger>().Warn("RefreshRateChanger.SetDisplayConfig(...): SDC_APPLY returned {0}", result);
return(false);
}
ServiceRegistration.Get <ILogger>().Debug("RefreshRateChanger.SetDisplayConfig(...): Successfully switched to {0}/{1}", numerator, denominator);
Windows7DwmFix.FixDwm();
_rateChanged = true;
return(true);
}
