BlazorGpuRenderSurfaceAdapter.cs

using Gondwana.Rendering;
using SkiaSharp;
 
namespace Gondwana.Blazor.Rendering;

public sealed class BlazorGpuRenderSurfaceAdapter : RenderSurfaceAdapterBase, IDisposable
{
    private Action? _afterFrameRenderHandler;
    private int _pendingFrame;
    private bool _disposed;

    internal BlazorGpuRenderSurfaceAdapter()
        : base(1, 1, initialSizeAvailable: false)
    {
    }

    internal void AttachToEngine()
    {
        if (_afterFrameRenderHandler is not null)
            return;
 
        _afterFrameRenderHandler = () =>
        {
            if (!_disposed)
                Interlocked.Exchange(ref _pendingFrame, 1);
        };
 
        Engine.Instance.AfterFrameRender += _afterFrameRenderHandler;
    }

    internal bool ConsumeFrameRequest() =>
        !_disposed && Interlocked.Exchange(ref _pendingFrame, 0) != 0;

    internal void BeginPaint(int width, int height)
    {
        if (!_disposed)
            SetDestinationSize(width, height);
    }

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

    public void Dispose()
    {
        if (_disposed)
            return;
 
        _disposed = true;
        Interlocked.Exchange(ref _pendingFrame, 0);
 
        if (_afterFrameRenderHandler is not null)
        {
            Engine.Instance.AfterFrameRender -= _afterFrameRenderHandler;
            _afterFrameRenderHandler = null;
        }
    }
}