private static int GetMonitorDpiScale(LUID adapterId, uint targetId)
{
try
{
DISPLAYCONFIG_SOURCE_DPI_SCALE_GET deviceInfo = new DISPLAYCONFIG_SOURCE_DPI_SCALE_GET();
deviceInfo.header.size = (uint)Marshal.SizeOf(typeof(DISPLAYCONFIG_SOURCE_DPI_SCALE_GET));
deviceInfo.header.adapterId = adapterId;
deviceInfo.header.id = targetId;
deviceInfo.header.type = DISPLAYCONFIG_DEVICE_INFO_TYPE.DISPLAYCONFIG_DEVICE_INFO_GET_DPI_SCALE;
int error = DisplayConfigGetDeviceInfo(ref deviceInfo);
if (error != 0)
{
Debug.WriteLine("Failed GetMonitorDpiScale: " + error);
return(0);
}
//Check minimum and maximum scale
if (deviceInfo.curScale < deviceInfo.minScale)
{
deviceInfo.curScale = deviceInfo.minScale;
}
else if (deviceInfo.curScale > deviceInfo.maxScale)
{
deviceInfo.curScale = deviceInfo.maxScale;
}
//Does not return custom set dpi values
int[] defaultDpiValues = { 100, 125, 150, 175, 200, 225, 250, 300, 350, 400, 450, 500, 550, 600 };
int minScaleAbs = Math.Abs(deviceInfo.minScale);
int curScaleAbs = Math.Abs(deviceInfo.curScale);
return(defaultDpiValues[minScaleAbs - curScaleAbs]);
}
catch
{
Debug.WriteLine("Failed GetMonitorDpiScale.");
return(0);
}
}
private static extern int DisplayConfigGetDeviceInfo(ref DISPLAYCONFIG_SOURCE_DPI_SCALE_GET requestPacket);