UWP 使用 win2d：加阴影

var bitmap = new CanvasRenderTarget(Control, (float)Width,
                   (float)Height, 96);
var effect = new Transform2DEffect() {
    Source = new ShadowEffect()
    {
        Source = bitmap,
        BlurAmount = 2,
    },
    TransformMatrix = Matrix3x2.CreateTranslation(3, 3)
};



private void DrawerCanvas_Draw(Microsoft.Graphics.Canvas.UI.Xaml.CanvasControl sender, Microsoft.Graphics.Canvas.UI.Xaml.CanvasDrawEventArgs args)
{
    args.DrawingSession.DrawImage(effect);
}

private void DrawerCanvas_Draw(Microsoft.Graphics.Canvas.UI.Xaml.CanvasControl sender, Microsoft.Graphics.Canvas.UI.Xaml.CanvasDrawEventArgs args)
{
    args.DrawingSession.DrawImage(effect);
    args.DrawingSession.DrawImage(bitmap);
}