SecondaryMonitorStutterFix/Program.cs at main · Darojax/SecondaryMonitorStutterFix · GitHub

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namespace SecondaryMonitorStutterFix;

internal static class Program
{
    private const string MutexName = @"Local\SecondaryMonitorStutterFix-7D4D37BB";
    private const string ActivationEventName = @"Local\SecondaryMonitorStutterFix-Activate-7D4D37BB";

    [STAThread]
    private static int Main(string[] args)
    {
        ApplicationConfiguration.Initialize();
        Application.SetUnhandledExceptionMode(UnhandledExceptionMode.CatchException);
        Application.ThreadException += (_, eventArgs) => AppLog.Write("Unhandled UI-thread exception.", eventArgs.Exception);
        AppDomain.CurrentDomain.UnhandledException += (_, eventArgs) =>
            AppLog.Write("Unhandled process exception.", eventArgs.ExceptionObject as Exception);

        if (args.Contains("--self-test", StringComparer.OrdinalIgnoreCase))
        {
            return RunSelfTest();
        }

        if (args.Contains("--startup-self-test", StringComparer.OrdinalIgnoreCase))
        {
            return RunStartupSelfTest();
        }

        using var activationEvent = new EventWaitHandle(
            initialState: false,
            EventResetMode.AutoReset,
            ActivationEventName);
        using var instanceMutex = new Mutex(initiallyOwned: true, MutexName, out var isFirstInstance);
        if (!isFirstInstance)
        {
            activationEvent.Set();
            return 0;
        }

        var startHidden = args.Contains("--background", StringComparer.OrdinalIgnoreCase);
        using var mainForm = new MainForm(startHidden);
        _ = mainForm.Handle;
        var activationRegistration = ThreadPool.RegisterWaitForSingleObject(
            activationEvent,
            (_, timedOut) =>
            {
                if (!timedOut)
                {
                    mainForm.RequestShowSettings();
                }
            },
            null,
            Timeout.Infinite,
            executeOnlyOnce: false);

        try
        {
            Application.Run(mainForm);
        }
        finally
        {
            _ = activationRegistration.Unregister(null);
        }

        GC.KeepAlive(instanceMutex);
        return 0;
    }

    private static int RunSelfTest()
    {
        try
        {
            var monitors = MonitorInfo.Discover();
            if (monitors.Count == 0)
            {
                return 2;
            }

            if (monitors.Any(monitor => string.IsNullOrWhiteSpace(monitor.PersistentId)) ||
                monitors.Select(monitor => monitor.PersistentId).Distinct(StringComparer.OrdinalIgnoreCase).Count() != monitors.Count)
            {
                return 5;
            }

            var surfaces = monitors
                .SelectMany(monitor => SurfaceMode.Standard.GetSurfaceSpecs()
                    .Select(spec => new AnimatedSurfaceForm(monitor.Screen, spec)))
                .ToArray();
            using var scheduling = NativeMethods.EnterSynchronizedScheduling();
            try
            {
                foreach (var surface in surfaces)
                {
                    surface.ShowSurface();
                }

                for (var frame = 0; frame < 10; frame++)
                {
                    foreach (var surface in surfaces)
                    {
                        surface.RenderNextFrame(synchronous: true);
                    }

                    NativeMethods.FlushComposition();
                    Application.DoEvents();
                    Thread.Sleep(10);
                }
            }
            finally
            {
                foreach (var surface in surfaces)
                {
                    surface.Close();
                    surface.Dispose();
                }
            }

            return surfaces.All(surface => surface.FrameCount >= 5) ? 0 : 3;
        }
        catch
        {
            return 4;
        }
    }

    private static int RunStartupSelfTest()
    {
        if (StartupShortcutManager.IsEnabled())
        {
            return 6;
        }

        try
        {
            var enabled = StartupShortcutManager.SetEnabled(true);
            if (!enabled.Success || !StartupShortcutManager.IsEnabled())
            {
                return 7;
            }

            var disabled = StartupShortcutManager.SetEnabled(false);
            return disabled.Success && !StartupShortcutManager.IsEnabled() ? 0 : 8;
        }
        finally
        {
            _ = StartupShortcutManager.SetEnabled(false);
        }
    }
}