dotnet X11 多次调用 XPutImage 是否能做到渲染同步

        XPutImage(display, handle, gc, ref xImage, @event.ExposeEvent.x, @event.ExposeEvent.y, @event.ExposeEvent.x, @event.ExposeEvent.y, (uint) @event.ExposeEvent.width,
            (uint) @event.ExposeEvent.height);

        XPutImage(display, handle, gc, ref halfImage, 0, 0, halfWidth, 0, (uint) halfWidth,
            (uint) height);

using CPF.Linux;

using SkiaSharp;

using static CPF.Linux.XLib;

XInitThreads();
var display = XOpenDisplay(IntPtr.Zero);
var screen = XDefaultScreen(display);
var rootWindow = XDefaultRootWindow(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 xDisplayWidth = XDisplayWidth(display, screen);
var xDisplayHeight = XDisplayHeight(display, screen);

var width = xDisplayWidth;
var height = xDisplayHeight;

var handle = XCreateWindow(display, rootWindow, 0, 0, width, height, 5,
    32,
    (int) CreateWindowArgs.InputOutput,
    visual,
    (nuint) valueMask, ref xSetWindowAttributes);

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

XMapWindow(display, handle);
XFlush(display);

var gc = XCreateGC(display, handle, 0, 0);
var skBitmap = new SKBitmap(width, height, SKColorType.Bgra8888, SKAlphaType.Premul);
var skCanvas = new SKCanvas(skBitmap);
var xImage = CreateImage(skBitmap);

skCanvas.Clear(SKColors.Blue);
skCanvas.Flush();

var halfWidth = width / 2;
var halfSkBitmap = new SKBitmap(halfWidth, height, SKColorType.Bgra8888, SKAlphaType.Premul);
var halfSkCanvas = new SKCanvas(halfSkBitmap);
halfSkCanvas.Clear();
halfSkCanvas.Flush();
var halfImage = CreateImage(halfSkBitmap);

_ = Task.Run(() =>
{
    var newDisplay = XOpenDisplay(IntPtr.Zero);

    while (true)
    {
        Console.ReadLine();

        var xEvent = new XEvent
        {
            ExposeEvent =
            {
                type = XEventName.Expose,
                send_event = true,
                window = handle,
                count = 1,
                display = newDisplay,
                x = 0,
                y = 0,
                width = width,
                height = height,
            }
        };
        // [Xlib Programming Manual: Expose Events](https://tronche.com/gui/x/xlib/events/exposure/expose.html )
        XLib.XSendEvent(newDisplay, handle, propagate: false,
            new IntPtr((int) (EventMask.ExposureMask)),
            ref xEvent);
        
        XFlush(newDisplay);
    }

    XCloseDisplay(newDisplay);
});

while (true)
{
    var xNextEvent = XNextEvent(display, out var @event);

    if (xNextEvent != 0)
    {
        break;
    }

    if (@event.type == XEventName.Expose)
    {
        skCanvas.Clear(new SKColor((uint)Random.Shared.Next()).WithAlpha(0xFF));
        skCanvas.Flush();

        XPutImage(display, handle, gc, ref xImage, @event.ExposeEvent.x, @event.ExposeEvent.y, @event.ExposeEvent.x, @event.ExposeEvent.y, (uint) @event.ExposeEvent.width,
            (uint) @event.ExposeEvent.height);

        XPutImage(display, handle, gc, ref halfImage, 0, 0, halfWidth, 0, (uint) halfWidth,
            (uint) height);
        XFlush(display);
    }
}

static XImage CreateImage(SKBitmap skBitmap)
{
    const int bytePerPixelCount = 4; // RGBA 一共4个 byte 长度
    var bitPerByte = 8;

    var bitmapWidth = skBitmap.Width;
    var bitmapHeight = skBitmap.Height;

    var img = new XImage();
    int bitsPerPixel = bytePerPixelCount * bitPerByte;
    img.width = bitmapWidth;
    img.height = bitmapHeight;
    img.format = 2; //ZPixmap;
    img.data = skBitmap.GetPixels();
    img.byte_order = 0; // LSBFirst;
    img.bitmap_unit = bitsPerPixel;
    img.bitmap_bit_order = 0; // LSBFirst;
    img.bitmap_pad = bitsPerPixel;
    img.depth = bitsPerPixel;
    img.bytes_per_line = bitmapWidth * bytePerPixelCount;
    img.bits_per_pixel = bitsPerPixel;
    XInitImage(ref img);

    return img;
}

git init
git remote add origin https://gitee.com/lindexi/lindexi_gd.git
git pull origin b54f37030aec86fda474e99c0ad9ae941e23e1da

git remote remove origin
git remote add origin https://github.com/lindexi/lindexi_gd.git
git pull origin b54f37030aec86fda474e99c0ad9ae941e23e1da