当我尝试在某些 pc 上将交换链纹理中的渲染内容读取到 byte[] 时，返回的数组大小大于预期

Question

所以情况是这样的
我现在使用 sharp dx 创建链接到 XAML 元素 SwapchainPanel 的交换链我在上面渲染了一些东西，然后我尝试将渲染数据抓取到 byte[] 中以放入图像缓冲区为此，我使用这个函数 ReadBuffer

    private D3D11.Texture2D OffscreenstagingTexture;
    private D3D11.Texture2D GetTexture(D3D11.Device _Device,
                             D3D11.DeviceContext _Context,
                             D3D11.Texture2DDescription _Desc)
    {
        if (OffscreenstagingTexture == null ||
            OffscreenstagingTexture.Description.Width != _Desc.Width ||
            OffscreenstagingTexture.Description.Height != _Desc.Height)
        {
            RemoveAndDispose(ref OffscreenstagingTexture);
            D3D11.Texture2DDescription _2DDesc = new D3D11.Texture2DDescription
            {
                Format = DXGI.Format.B8G8R8A8_UNorm,
                Height = _Desc.Height,
                Width = _Desc.Width,
                SampleDescription = new DXGI.SampleDescription(1, 0),
                ArraySize = _Desc.ArraySize,
                BindFlags = D3D11.BindFlags.None,
                CpuAccessFlags = D3D11.CpuAccessFlags.Read | D3D11.CpuAccessFlags.Write,
                Usage = D3D11.ResourceUsage.Staging,
                MipLevels = _Desc.MipLevels
            };
            OffscreenstagingTexture = ToDispose(new D3D11.Texture2D(_Device, _2DDesc));
        }

        return OffscreenstagingTexture;
    }


    public byte[] ReadBuffer(D3D11.Texture2D _2DTexture)
    {
        byte[] data = null;
        D3D11.Texture2DDescription _Desc = _2DTexture.Description;
        D3D11.Device _Device = _2DTexture.Device;
        D3D11.DeviceContext _Context = _Device.ImmediateContext;
        D3D11.Texture2D _2DMappedTexture = GetTexture(_Device, _Context, _Desc);
        try
        {
            _Context.CopyResource(_2DTexture, _2DMappedTexture);
            int size = _Desc.Width * _Desc.Height * 4;
            DataBox box = _Context.MapSubresource(_2DMappedTexture, 0, 0, D3D11.MapMode.Read, D3D11.MapFlags.None, out DataStream stream);
            data = ToByteArray(stream);
            stream.Dispose();
        }
        catch (Exception)
        {

        }
        return data;
    }

    private byte[] ToByteArray(Stream inputStream)
    {
        using (MemoryStream ms = new MemoryStream())
        {
            inputStream.CopyTo(ms);
            return ms.ToArray();
        }
    }

现在，在大多数电脑上，它工作正常，但有一些电脑 SwapChainPanle 返回比预期更大的字节[] 如果我有 100 * 100 SwapChainPanel 那么预期的字节数组大小是 100 * 100 * 4 但它 returns 比那个更大的数组并且因为在某些电脑上我的应用程序崩溃了我也在我的戴尔 Vostro 3558 上检查了同样的崩溃

Answer 1

所以我找到了修复方法，我必须更新 Readbuffer 函数

public byte[] ReadBuffer(D3D11.Texture2D _2DTexture)
{
    D3D11.Texture2DDescription _Desc = _2DTexture.Description;
    D3D11.Device _Device = _2DTexture.Device;
    D3D11.DeviceContext _Context = _Device.ImmediateContext;
    D3D11.Texture2D _2DMappedTexture = GetTexture(_Device, _Context, _Desc);
    _Context.CopyResource(_2DTexture, _2DMappedTexture);
    DataBox box = _Context.MapSubresource(_2DMappedTexture, 0, 0, D3D11.MapMode.Read, D3D11.MapFlags.None, out DataStream stream);
    var dataRectangle = new DataRectangle
    {
        DataPointer = stream.DataPointer,
        Pitch = box.RowPitch
    };
    var strid = _Desc.Width * 4;
    int size = _Desc.Width * _Desc.Height * 4;
    using (var bitmap = new Bitmap(manager.WICFactory,
                                   _2DMappedTexture.Description.Width,
                                   _2DMappedTexture.Description.Height,
                                   PixelFormat.Format32bppBGRA,
                                   dataRectangle))
    {
        var data = new byte[size];
        bitmap.CopyPixels(data, strid);
        _Context.UnmapSubresource(_2DMappedTexture, 0);
        return data;
    }
}

而且效果很好

当我尝试在某些 pc 上将交换链纹理中的渲染内容读取到 byte[] 时，返回的数组大小大于预期

when i try read renderd content from the texture of swapchain into byte[] on some pc's the returned array size bigger then expected

c#

sharpdx

uwp