OpenTK.Platform.X11.API.XF86VidModeQueryVersion C# (CSharp) Method

        extern public static bool XF86VidModeQueryVersion(
            Display display,
            out int major_version_return,
            out int minor_version_return);
        [DllImport(_dll_name_vid)]

        private bool QueryXF86(List <DisplayDevice> devices)
        {
            int major;
            int minor;

            try
            {
                if (!API.XF86VidModeQueryVersion(API.DefaultDisplay, out major, out minor))
                {
                    return(false);
                }
            }
            catch (DllNotFoundException)
            {
                return(false);
            }

            var currentScreen = 0;

            Debug.Print("Using XF86 v" + major + "." + minor);

            foreach (var dev in devices)
            {
                int count;

                IntPtr srcArray;
                API.XF86VidModeGetAllModeLines(API.DefaultDisplay, currentScreen, out count, out srcArray);
                Debug.Print(count + " modes detected on screen " + currentScreen);
                var array = new IntPtr[count];
                Marshal.Copy(srcArray, array, 0, count);
                var Mode = new API.XF86VidModeModeInfo();

                int x;
                int y;
                API.XF86VidModeGetViewPort(API.DefaultDisplay, currentScreen, out x, out y);
                var resolutions = new List <DisplayResolution>();
                for (var i = 0; i < count; i++)
                {
                    Mode = (API.XF86VidModeModeInfo)Marshal.PtrToStructure(array[i], typeof(API.XF86VidModeModeInfo));
                    resolutions.Add(new DisplayResolution(x, y, Mode.hdisplay, Mode.vdisplay, 24,
                                                          Mode.dotclock * 1000F / (Mode.vtotal * Mode.htotal)));
                }

                dev.AvailableResolutions = resolutions;
                int pixelClock;
                API.XF86VidModeModeLine currentMode;
                API.XF86VidModeGetModeLine(API.DefaultDisplay, currentScreen, out pixelClock, out currentMode);
                dev.Bounds = new Rectangle(x, y, currentMode.hdisplay,
                                           currentMode.vdisplay == 0 ? currentMode.vsyncstart : currentMode.vdisplay);
                dev.BitsPerPixel = FindCurrentDepth(currentScreen);
                dev.RefreshRate  = pixelClock * 1000F / (currentMode.vtotal * currentMode.htotal);
                currentScreen++;
            }

            return(true);
        }