AvaloniaGpuRenderSurfaceAdapter.cs

using Gondwana.Rendering;
using Gondwana.Rendering.Backbuffers;
using SkiaSharp;
 
namespace Gondwana.Avalonia.Rendering;

public sealed class AvaloniaGpuRenderSurfaceAdapter : RenderSurfaceAdapterBase, IDisposable
{
    private Action? _afterFrameRenderHandler;
    private bool _disposed;

    public SKColor ClearColor { get; set; } = SKColors.Black;

    internal AvaloniaGpuRenderSurfaceAdapter(int initialWidth, int initialHeight)
        : base(Math.Max(1, initialWidth), Math.Max(1, initialHeight), initialSizeAvailable: false)
    {
    }

    internal void UpdateDimensions(int physW, int physH)
    {
        if (!_disposed)
            SetDestinationSize(Math.Max(0, physW), Math.Max(0, physH));
    }

    internal void AttachToEngine(Action requestRepaint)
    {
        _afterFrameRenderHandler = () =>
        {
            if (!_disposed)
                Engine.Instance.UiDispatcher!.Post(requestRepaint);
        };
        Engine.Instance.AfterFrameRender += _afterFrameRenderHandler;
    }

    public override void Present(SKImage bufferImage, SKRectI bufferRect, SKRect destRect)
    {
        bufferImage.Dispose();
    }

    public void Dispose()
    {
        if (_disposed) return;
        _disposed = true;
 
        if (_afterFrameRenderHandler != null)
        {
            Engine.Instance.AfterFrameRender -= _afterFrameRenderHandler;
            _afterFrameRenderHandler = null;
        }
    }
}