将 Win2D CanvasRenderTarget 转换为 BitmapImage? [英] Converting a Win2D CanvasRenderTarget to a BitmapImage?

问题描述

我正在尝试编写一个函数，它接受我的 ICanvasEffect 作为参数(在我的例子中是一个 Win2D BlendEffect)，我想转换 ICanvasEffectstrong>CanvasRenderTarget 到 BitmapImage 以便我可以在 UWP Image 控件中使用它:

I'm trying to write a function which accepts my ICanvasEffect as a parameter (which in my case is a Win2D BlendEffect), and I want to convert the CanvasRenderTarget to a BitmapImage so that I can use it in a UWP Image control:

    private async Task<BitmapImage> GetBitmapImage(CancellationToken ct, ICanvasImage effect)
    {
        using (var target = new CanvasRenderTarget(CanvasDevice.GetSharedDevice(), 320f, 240f, 96))
        {
            using (var ds = target.CreateDrawingSession())
            {
                // Draw the image with the supplied ICanvasImage
                ds.DrawImage(effect);
            }

            //await target.SaveAsync(outputStream, CanvasBitmapFileFormat.Jpeg).AsTask(ct);
        }
    }

正如您在注释代码中看到的那样，CanvasRenderTarget 有一个 SaveAsync 方法，我可以使用它将其保存到流中，但如何保存?

As you see in the commented code, CanvasRenderTarget has a SaveAsync method I can use to save it to a Stream, but how?

推荐答案

想通了:

    using (var stream = new InMemoryRandomAccessStream())
    {
        await target.SaveAsync(stream, CanvasBitmapFileFormat.Jpeg).AsTask(ct);

        var bmp = new BitmapImage();

        stream.Seek(0);
        await bmp.SetSourceAsync(stream);
    }

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