private static PathInfo[] GetPathInfos(QueryDeviceConfigFlags flags, out DisplayConfigTopologyId topologyId)
{
DisplayConfigPathInfo[] displayPaths;
DisplayConfigModeInfo[] displayModes;
uint pathCount;
while (true)
{
uint modeCount;
var error = DisplayConfigApi.GetDisplayConfigBufferSizes(flags,
out pathCount,
out modeCount);
if (error != Win32Status.Success)
{
throw new Win32Exception((int)error);
}
displayPaths = new DisplayConfigPathInfo[pathCount];
displayModes = new DisplayConfigModeInfo[modeCount];
if (flags == QueryDeviceConfigFlags.DatabaseCurrent)
{
error = DisplayConfigApi.QueryDisplayConfig(flags,
ref pathCount, displayPaths, ref modeCount, displayModes, out topologyId);
}
else
{
topologyId = DisplayConfigTopologyId.None;
error = DisplayConfigApi.QueryDisplayConfig(flags,
ref pathCount, displayPaths, ref modeCount, displayModes, IntPtr.Zero);
}
if (error == Win32Status.Success)
{
break;
}
if (error != Win32Status.ErrorInsufficientBuffer)
{
throw new Win32Exception((int)error);
}
}
var pathInfos =
new Dictionary
<uint,
Tuple
<DisplayConfigPathSourceInfo, DisplayConfigSourceMode?,
List
<
Tuple
<DisplayConfigPathInfoFlags, DisplayConfigPathTargetInfo, DisplayConfigTargetMode?,
DisplayConfigDesktopImageInfo?> >
> >
();
var sourceId = uint.MaxValue;
for (var i = 0u; i < pathCount; i++)
{
var displayPath = displayPaths[i];
DisplayConfigSourceMode?sourceMode = null;
var key = sourceId;
var isVirtualSupported = displayPath.Flags.HasFlag(DisplayConfigPathInfoFlags.SupportVirtualMode);
if (isVirtualSupported &&
(displayPath.SourceInfo.SourceModeInfoIndex != DisplayConfigSourceMode.InvalidSourceModeIndex) &&
(displayModes[displayPath.SourceInfo.SourceModeInfoIndex].InfoType ==
DisplayConfigModeInfoType.Source))
{
sourceMode = displayModes[displayPath.SourceInfo.SourceModeInfoIndex].SourceMode;
key = displayPath.SourceInfo.SourceModeInfoIndex;
}
else if (!isVirtualSupported &&
(displayPath.SourceInfo.ModeInfoIndex != DisplayConfigModeInfo.InvalidModeIndex) &&
(displayModes[displayPath.SourceInfo.ModeInfoIndex].InfoType ==
DisplayConfigModeInfoType.Source))
{
sourceMode = displayModes[displayPath.SourceInfo.ModeInfoIndex].SourceMode;
key = displayPath.SourceInfo.ModeInfoIndex;
}
else
{
sourceId--;
}
if (!pathInfos.ContainsKey(key))
{
pathInfos.Add(key,
new Tuple
<DisplayConfigPathSourceInfo, DisplayConfigSourceMode?,
List
<
Tuple
<DisplayConfigPathInfoFlags, DisplayConfigPathTargetInfo, DisplayConfigTargetMode?,
DisplayConfigDesktopImageInfo?> >
>(
displayPath.SourceInfo, sourceMode,
new List
<
Tuple
<DisplayConfigPathInfoFlags, DisplayConfigPathTargetInfo, DisplayConfigTargetMode?,
DisplayConfigDesktopImageInfo?> >
()));
}
DisplayConfigTargetMode?targetMode = null;
if (isVirtualSupported &&
(displayPath.TargetInfo.TargetModeInfoIndex != DisplayConfigTargetMode.InvalidTargetModeIndex) &&
(displayModes[displayPath.TargetInfo.TargetModeInfoIndex].InfoType ==
DisplayConfigModeInfoType.Target))
{
targetMode = displayModes[displayPath.TargetInfo.TargetModeInfoIndex].TargetMode;
}
else if (!isVirtualSupported &&
(displayPath.TargetInfo.ModeInfoIndex != DisplayConfigModeInfo.InvalidModeIndex) &&
(displayModes[displayPath.TargetInfo.ModeInfoIndex].InfoType ==
DisplayConfigModeInfoType.Target))
{
targetMode = displayModes[displayPath.TargetInfo.ModeInfoIndex].TargetMode;
}
DisplayConfigDesktopImageInfo?desktopImageMode = null;
if (isVirtualSupported &&
(displayPath.TargetInfo.DesktopModeInfoIndex !=
DisplayConfigDesktopImageInfo.InvalidDesktopImageModeIndex) &&
(displayModes[displayPath.TargetInfo.DesktopModeInfoIndex].InfoType ==
DisplayConfigModeInfoType.DesktopImage))
{
desktopImageMode = displayModes[displayPath.TargetInfo.DesktopModeInfoIndex].DesktopImageInfo;
}
pathInfos[key].Item3.Add(
new Tuple
<DisplayConfigPathInfoFlags, DisplayConfigPathTargetInfo, DisplayConfigTargetMode?,
DisplayConfigDesktopImageInfo?>(
displayPath.Flags, displayPath.TargetInfo, targetMode, desktopImageMode));
}
return
(pathInfos.Select(pair => new PathInfo(pair.Value.Item1, pair.Value.Item2, pair.Value.Item3)).ToArray());
}
