private uint _maximum = 100; // Raw maximum brightness (not always 100)
public void ReadDeviceBrightness()
{
var(success, minimum, current, maximum) = MonitorApi.GetBrightness(_handle);
if (!success || !(minimum < maximum) || !(minimum <= current) || !(current <= maximum))
{
Brightness = -1;
return;
}
Brightness = (int)Math.Round((double)(current - minimum) / (maximum - minimum) * 100D,
MidpointRounding.AwayFromZero);
_minimum = minimum;
_maximum = maximum;
}
public static IEnumerable <DdcMonitorItem> EnumerateMonitors()
{
var deviceItems = DeviceContext.EnumerateMonitorDevices().ToList();
if (deviceItems.Any() != true)
{
yield break;
}
// Obtained by DDC/CI
foreach (var handleItem in DeviceContext.GetMonitorHandles())
{
foreach (var physicalItem in MonitorApi.EnumeratePhysicalMonitors(handleItem.MonitorHandle))
{
var index = -1;
if (physicalItem.IsSupported)
{
index = deviceItems.FindIndex(x =>
x.DisplayIndex == handleItem.DisplayIndex &&
x.MonitorIndex == physicalItem.MonitorIndex &&
string.Equals(x.Description, physicalItem.Description, StringComparison.OrdinalIgnoreCase));
}
if (index < 0)
{
physicalItem.Handle.Dispose();
continue;
}
var deviceItem = deviceItems[index];
yield return(new DdcMonitorItem(
deviceItem.DeviceInstanceId,
deviceItem.Description,
deviceItem.DisplayIndex,
deviceItem.MonitorIndex,
physicalItem.Handle));
deviceItems.RemoveAt(index);
if (deviceItems.Count == 0)
{
yield break;
}
}
}
}
public bool SetDeviceBrightness(int brightness)
{
if ((brightness < 0) || (100 < brightness))
{
throw new ArgumentOutOfRangeException(nameof(brightness), brightness,
"The brightness must be within 0 to 100.");
}
var buffer = (uint)Math.Round(brightness / 100D * (_maximum - _minimum) + _minimum,
MidpointRounding.AwayFromZero);
if (!MonitorApi.SetBrightness(_handle, buffer))
{
return(false);
}
Brightness = brightness;
return(true);
}
public override bool IsInvalid => false; // The validity cannot be checked by the handle.
protected override bool ReleaseHandle()
{
return(MonitorApi.DestroyPhysicalMonitor(handle));
}
