如何在xamarin跨平台的imageview中应用对角线切割？

using SkiaSharp;
using SkiaSharp.Views.Forms;
using Xamarin.Forms;

namespace YourNamespace
{
    public class DiagonalImageView : Image
    {
        public static readonly BindableProperty DiagonalAngleProperty =
            BindableProperty.Create(nameof(DiagonalAngle), typeof(double), typeof(DiagonalImageView), 45.0);

        public double DiagonalAngle
        {
            get { return (double)GetValue(DiagonalAngleProperty); }
            set { SetValue(DiagonalAngleProperty, value); }
        }

        protected override void OnParentSet()
        {
            base.OnParentSet();
            InvalidateSurface();
        }

        protected override void OnDrawFrame(SKSurface surface, SKImageInfo info)
        {
            base.OnDrawFrame(surface, info);

            var canvas = surface.Canvas;
            canvas.Clear();

            var diagonalRadians = DiagonalAngle * (float)(System.Math.PI / 180);
            var diagonalSlope = (float)System.Math.Tan(diagonalRadians);

            var path = new SKPath();
            path.MoveTo(0, 0);
            path.LineTo(info.Width, 0);
            path.LineTo(info.Width, info.Height);
            path.LineTo(0, info.Height);
            path.Close();

            var clipPath = new SKPath();
            clipPath.MoveTo(0, 0);
            clipPath.LineTo(info.Width, 0);
            clipPath.LineTo(info.Width, info.Height);
            clipPath.LineTo(0, info.Height);
            clipPath.Close();

            var diagonalPath = new SKPath();
            diagonalPath.MoveTo(0, 0);
            diagonalPath.LineTo(info.Width, 0);
            diagonalPath.LineTo(info.Width, info.Height);
            diagonalPath.LineTo(0, info.Height);
            diagonalPath.Close();

            diagonalPath.MoveTo(0, 0);
            diagonalPath.LineTo(info.Width, info.Height * diagonalSlope);
            diagonalPath.LineTo(info.Width, info.Height);
            diagonalPath.LineTo(0, info.Height);
            diagonalPath.Close();

            canvas.ClipPath(clipPath);
            canvas.DrawPath(diagonalPath, new SKPaint() { Color = SKColors.Transparent });
            canvas.DrawPath(path, new SKPaint() { Color = SKColors.White });
        }
    }
}

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:local="clr-namespace:YourNamespace"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="YourNamespace.YourPage">
    <StackLayout>
        <local:DiagonalImageView Source="your_image_source.png" DiagonalAngle="45" />
    </StackLayout>
</ContentPage>