gistfile1.txt

using Avalonia;
using Avalonia.Controls;
using Avalonia.Media;
using Avalonia.Platform;
using Avalonia.Rendering.SceneGraph;
using Avalonia.Skia;
using Avalonia.Threading;
using SkiaSharp;

namespace M64RPFW.Views.Avalonia.Controls;

// https://github.com/AvaloniaUI/Avalonia/blob/master/samples/RenderDemo/Pages/CustomSkiaPage.cs
public class SkiaControl : Control
{
    public SkiaControl()
    {
        ClipToBounds = true;
    }

    private class CustomDrawOp : ICustomDrawOperation
    {
        public CustomDrawOp(Rect bounds)
        {
            Bounds = bounds;
        }

        public void Dispose()
        {
            // No-op
        }

        public Rect Bounds { get; }

        public bool HitTest(Point p)
        {
            return false;
        }

        public bool Equals(ICustomDrawOperation other)
        {
            return false;
        }

        public void Render(ImmediateDrawingContext context)
        {
            var leaseFeature = context.TryGetFeature<ISkiaSharpApiLeaseFeature>();
            using var lease = leaseFeature.Lease();
            var canvas = lease.SkCanvas;
            canvas.Save();

            canvas.DrawCircle(100, 100, 50, new SKPaint() { Color = SKColors.Blue});
            canvas.Restore();
        }
    }


    public override void Render(DrawingContext context)
    {
        context.Custom(new CustomDrawOp(new Rect(0, 0, Bounds.Width, Bounds.Height)));
        Dispatcher.UIThread.InvokeAsync(InvalidateVisual, DispatcherPriority.Background);
    }
}