// Copy from https://github.com/AvaloniaUI/Avalonia \src\Avalonia.X11\Screens\X11Screen.Providers.cs

public class Randr15ScreensImpl
{
    public Randr15ScreensImpl(nint display, nint rootWindow)
    {
        _display = display;
        var eventWindow = CreateEventWindow(display, rootWindow);
        _window = eventWindow;

        XRRSelectInput(display, _window, RandrEventMask.RRScreenChangeNotify);
    }

    public unsafe MonitorInfo[] GetMonitorInfos()
    {
        XRRMonitorInfo* monitors = XRRGetMonitors(_display, _window, true, out var count);
        var screens = new MonitorInfo[count];
        for (var c = 0; c < count; c++)
        {
            var mon = monitors[c];

            var outputs = new nint[mon.NOutput];

            for (int i = 0; i < outputs.Length; i++)
            {
                outputs[i] = mon.Outputs[i];
            }

            screens[c] = new MonitorInfo()
            {
                Name = mon.Name,
                IsPrimary = mon.Primary != 0,
                X = mon.X,
                Y = mon.Y,
                Width = mon.Width,
                Height = mon.Height,
                Outputs = outputs,
                Display = _display,
            };
        }

        return screens;
    }

    private readonly IntPtr _display;

    private readonly IntPtr _window;
}

public unsafe struct MonitorInfo
{
    public IntPtr Name;
    public bool IsPrimary;
    public int X;
    public int Y;
    public int Width;
    public int Height;
    public IntPtr[] Outputs;
    public IntPtr Display { get; init; }

    public override string ToString()
    {
        var namePtr = XGetAtomName(Display, Name);
            var name = Marshal.PtrToStringAnsi(namePtr);
        XFree(namePtr);

        return $"{name}({Name}) IsPrimary={IsPrimary} XY={X},{Y} WH={Width},{Height}";
    }
}

var randr15ScreensImpl = new Randr15ScreensImpl(display, rootWindow);
var monitorInfos = randr15ScreensImpl.GetMonitorInfos();
for (var i = 0; i < monitorInfos.Length; i++)
{
    Console.WriteLine($"屏幕{i} {monitorInfos[i]}");
}

var xDisplayWidth = XDisplayWidth(display, screen);
var xDisplayHeight = XDisplayHeight(display, screen);

Console.WriteLine($"XDisplayWidth={xDisplayWidth}");
Console.WriteLine($"XDisplayHeight={xDisplayHeight}");

    public TestX11Window(int x, int y, int width, int height, nint display,nint rootWindow,int screen)
    {
        Display = display;

        XMatchVisualInfo(display, screen, 32, 4, out var info);
        var visual = info.visual;

        var valueMask =
                //SetWindowValuemask.BackPixmap
                0
                | SetWindowValuemask.BackPixel
                | SetWindowValuemask.BorderPixel
                | SetWindowValuemask.BitGravity
                | SetWindowValuemask.WinGravity
                | SetWindowValuemask.BackingStore
                | SetWindowValuemask.ColorMap
            //| SetWindowValuemask.OverrideRedirect
            ;
        var xSetWindowAttributes = new XSetWindowAttributes
        {
            backing_store = 1,
            bit_gravity = Gravity.NorthWestGravity,
            win_gravity = Gravity.NorthWestGravity,
            //override_redirect = true, // 设置窗口的override_redirect属性为True，以避免窗口管理器的干预
            colormap = XCreateColormap(display, rootWindow, visual, 0),
            border_pixel = 0,
            background_pixel = 0,
        };

        var handle = XCreateWindow(display, rootWindow, x, y, width, height, 5,
            32,
            (int) CreateWindowArgs.InputOutput,
            visual,
            (nuint) valueMask, ref xSetWindowAttributes);

        // 在 XMapWindow 之前固定在某个屏幕上
        var hints = new XSizeHints
        {
            min_width = width,
            min_height = height,
            max_width = width,
            max_height = height,

            x = x,
            y = y,
        };
        var flags = XSizeHintsFlags.PMinSize | XSizeHintsFlags.PResizeInc | XSizeHintsFlags.PPosition | XSizeHintsFlags.USPosition;
        hints.flags = (IntPtr) flags;
        XSetWMNormalHints(display, handle, ref hints);

        X11Window = handle;

        XEventMask ignoredMask = XEventMask.SubstructureRedirectMask | XEventMask.ResizeRedirectMask |
                                 XEventMask.PointerMotionHintMask;
        var mask = new IntPtr(0xffffff ^ (int) ignoredMask);
        XSelectInput(display, handle, mask);

        ...
    }

var testX11Window1 = new TestX11Window(0, 0, width, height, display, rootWindow, screen);

testX11Window1.MapWindow();
testX11Window1.Draw();

Console.WriteLine($"X11Window1={testX11Window1.X11Window}");

var testX11Window2 = new TestX11Window(1920, 0, width, height, display, rootWindow, screen);
testX11Window2.MapWindow();
testX11Window2.Draw();

Console.WriteLine($"X11Window2={testX11Window2.X11Window}");