/// <summary>
/// Change the current video mode to the specified mode.
/// </summary>
/// <param name="adapter">Video adapter information.</param>
/// <param name="mode">New video mode.</param>
/// <returns>
/// <strong>true</strong> if the operation could be performed; <strong>false</strong> otherwise.
/// </returns>
public static bool ChangeVideoMode(VideoAdapterDeviceInfo adapter, VideoModeDeviceInfo mode)
{
const DeviceContext.NativeMethods.ChangeDisplaySettingsFlags flags = DeviceContext.NativeMethods.ChangeDisplaySettingsFlags.CDS_UPDATEREGISTRY | DeviceContext.NativeMethods.ChangeDisplaySettingsFlags.CDS_SET_PRIMARY;
var result = ChangeVideoMode(adapter, mode, flags);
return(result == DeviceContext.NativeMethods.DISP_CHANGE.DISP_CHANGE_SUCCESSFUL);
}
/// <summary>
/// Array with the information of the video modes supported by a video adapter.
/// </summary>
/// <param name="videoAdapterInfo">Video adapter information.</param>
/// <returns>
/// Returns a <see cref="T:System.Array"/> of structures <see cref="VideoAdapterDeviceInfo"/> that contains the video modes supported by a video adapter.
/// </returns>
public static VideoModeDeviceInfo[] EnumerateVideoModesFromAdapter(VideoAdapterDeviceInfo videoAdapterInfo)
{
var videoModes = new Collection <VideoModeDeviceInfo>();
var currentMode = GetCurrentVideoModeFromAdapter(videoAdapterInfo);
for (int i = 0; ; i++)
{
var videoMode = GdiPrint.DEVMODE.Empty;
var modeIsAvailable = DeviceContext.NativeMethods.EnumDisplaySettingsEx(videoAdapterInfo.DisplayName, i, ref videoMode, DeviceContext.NativeMethods.EnumDisplayFlags.EDS_NORMAL);
if (!modeIsAvailable)
{
break;
}
var apiModeInfo = new VideoModeDeviceInfo(videoMode);
if (apiModeInfo == currentMode)
{
apiModeInfo.SetCurrent(true);
}
videoModes.Add(apiModeInfo);
}
return((VideoModeDeviceInfo[])videoModes.ToArray().Clone());
}
/// <summary>
/// Returns a reference to the current video mode information for the specified device.
/// </summary>
/// <param name="videoAdapterData"> Video adapter information.</param>
/// <returns>
/// Returns a <see cref="VideoModeDeviceInfo"/> structure that contains the current video mode information.
/// </returns>
public static VideoModeDeviceInfo GetCurrentVideoModeFromAdapter(VideoAdapterDeviceInfo videoAdapterData)
{
var mode = GdiPrint.DEVMODE.Empty;
DeviceContext.NativeMethods.EnumDisplaySettings(videoAdapterData.DisplayName, GdiPrint.DEVMODE.ENUM_CURRENT_SETTINGS, ref mode);
return(new VideoModeDeviceInfo(mode));
}
/// <summary>
/// Change the current video mode to the specified mode.
/// </summary>
/// <param name="adapter">The adapter.</param>
/// <param name="newVideoMode">New video mode.</param>
/// <param name="flags">Status indicators for changing / testing a video mode.</param>
/// <returns>
/// One of the values in the <see cref="DeviceContext.NativeMethods.DISP_CHANGE"/> enumeration that indicates the status.
/// </returns>
private static DeviceContext.NativeMethods.DISP_CHANGE ChangeVideoMode(VideoAdapterDeviceInfo adapter, VideoModeDeviceInfo newVideoMode, DeviceContext.NativeMethods.ChangeDisplaySettingsFlags flags)
{
var devMode = GdiPrint.DEVMODE.Empty;
devMode.dmFields = GdiPrint.DEVMODE.DM.Position | GdiPrint.DEVMODE.DM.PelsWidth | GdiPrint.DEVMODE.DM.PelsHeight | GdiPrint.DEVMODE.DM.DisplayFlags | GdiPrint.DEVMODE.DM.BitsPerPixel | GdiPrint.DEVMODE.DM.DisplayFrequency;
devMode.dmPelsWidth = newVideoMode.Size.Width;
devMode.dmPelsHeight = newVideoMode.Size.Height;
devMode.dmPosition.X = newVideoMode.Location.X;
devMode.dmPosition.Y = newVideoMode.Location.Y;
devMode.dmBitsPerPel = newVideoMode.BitsPerPixel;
devMode.dmDisplayFrequency = newVideoMode.Frequency;
return(DeviceContext.NativeMethods.ChangeDisplaySettingsEx(adapter.DisplayName, ref devMode, IntPtr.Zero, (int)flags, IntPtr.Zero));
}
/// <summary>
/// Check if this video mode is a valid video mode.
/// </summary>
/// <param name="adapter"> Video adapter information. </param>
/// <param name="mode"> Video mode to check. </param>
/// <returns>
/// <strong>true</strong> if it is a valid video mode; <strong>false</strong> otherwise.
/// </returns>
public static bool TestVideoMode(VideoAdapterDeviceInfo adapter, VideoModeDeviceInfo mode)
{
var result = ChangeVideoMode(adapter, mode, DeviceContext.NativeMethods.ChangeDisplaySettingsFlags.CDS_TEST);
return(result == DeviceContext.NativeMethods.DISP_CHANGE.DISP_CHANGE_SUCCESSFUL);
}
