public void SetIntegratedDisplayBrightness(uint brightness)
{
if (m_wmiBrightnessControls == null)
{
return;
}
lock ( m_displayChangeQueueLock )
{
/*replace any existing brightness change, or create a new one*/
bool replaced = false;
for (int i = 0; i < m_displayChangeQueue.Count; i++)
{
if (m_displayChangeQueue[i].Type == DisplayChangeType.Brightness && m_displayChangeQueue[i].TargetDisplay == null)
{
m_displayChangeQueue[i] = new BrightnessDisplayChange(null, brightness);
replaced = true;
}
}
if (!replaced)
{
m_displayChangeQueue.Add(new BrightnessDisplayChange(null, brightness));
}
}
m_newDisplayChangeEvent.Set();
}
/// <summary>
/// Queues a brightness change for a display. Only one brightness change can be processed at once so the change may not occur immediately
/// </summary>
/// <param name="display">display to set brightness of</param>
/// <param name="brightness">new brightness value. value will be clamped to the display's mininum and maximum values</param>
/// <returns></returns>
public void SetAttachedDisplayBrightness(Display display, uint brightness)
{
if (display == null)
{
return;
}
if (display.IsValid == false)
{
System.Diagnostics.Debug.WriteLine("Tried to set brightness on invalid display!");
return;
}
brightness = MathHelpers.ClampValue(brightness, display.MinBrightness, display.MaxBrightness);
lock ( m_displayChangeQueueLock )
{
//if a brightness change is already queued for this display, replace it with this new one, otherwise queue up a new one
bool replaced = false;
for (int i = 0; i < m_displayChangeQueue.Count; i++)
{
if (m_displayChangeQueue[i].TargetDisplay != null && m_displayChangeQueue[i].Type == DisplayChangeType.Brightness &&
m_displayChangeQueue[i].TargetDisplay.Handle.hPhysicalMonitor == display.Handle.hPhysicalMonitor)
{
m_displayChangeQueue[i] = new BrightnessDisplayChange(display, brightness);
replaced = true;
}
}
if (!replaced)
{
m_displayChangeQueue.Add(new BrightnessDisplayChange(display, brightness));
}
}
m_newDisplayChangeEvent.Set();
}
/// <summary>
/// Async method responsible for applying queued changes to the displays
/// </summary>
private void _DisplayChangeApplicatorAsync()
{
DisplayChange displayChange;
while (!m_shutdown)
{
m_newDisplayChangeEvent.WaitOne();
if (m_shutdown)
{
return;
}
while (m_displayChangeQueue.Count > 0)
{
lock ( m_displayChangeQueueLock )
{
displayChange = m_displayChangeQueue.First();
m_displayChangeQueue.RemoveAt(0);
}
if (displayChange == null)
{
continue;
}
if (displayChange.Type == DisplayChangeType.Brightness)
{
BrightnessDisplayChange brightnessChange = displayChange as BrightnessDisplayChange;
if (brightnessChange == null)
{
continue;
}
if (brightnessChange.TargetDisplay != null)
{
//set brightness of attached display, if there is one
_SetDisplayBrightness(brightnessChange.TargetDisplay.Handle, brightnessChange.Brightness);
}
else
{
//set brightness of integrated displays, if supported
if (m_wmiBrightnessSetter != null)
{
try
{
var wmiBrightnessParams = m_wmiBrightnessSetter.GetMethodParameters("WmiSetBrightness");
wmiBrightnessParams["Brightness"] = brightnessChange.Brightness;
wmiBrightnessParams["Timeout"] = 0;
m_wmiBrightnessSetter.InvokeMethod("WmiSetBrightness", wmiBrightnessParams, null);
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine("An integrated display appears to be present, but an error occured trying to set its brightness: " + e.Message);
}
}
}
}
}
}
}
