如何在Xamarin.Forms中对图像进行椭圆整形？

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

namespace YourNamespace
{
    public class EllipseImage : Image
    {
        protected override void OnSizeAllocated(double width, double height)
        {
            base.OnSizeAllocated(width, height);

            // Create a new SKBitmap with the same size as the control
            var bitmap = new SKBitmap((int)width, (int)height);

            // Create a new SKCanvas with the bitmap
            using (var canvas = new SKCanvas(bitmap))
            {
                // Clear the canvas
                canvas.Clear(SKColors.Transparent);

                // Calculate the radius of the ellipse
                var radiusX = (float)(width / 2);
                var radiusY = (float)(height / 2);

                // Calculate the center point of the ellipse
                var centerX = (float)(width / 2);
                var centerY = (float)(height / 2);

                // Draw the ellipse using SKPaint
                using (var paint = new SKPaint())
                {
                    paint.IsAntialias = true;
                    paint.Color = SKColors.Transparent;
                    paint.Style = SKPaintStyle.Fill;

                    // Draw the ellipse
                    canvas.DrawOval(centerX - radiusX, centerY - radiusY, centerX + radiusX, centerY + radiusY, paint);
                }

                // Apply the bitmap to the control's Source property
                Source = ImageSource.FromStream(() => bitmap.ToMemoryStream());
            }
        }
    }
}

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:YourNamespace"
             x:Class="YourNamespace.YourPage">

    <local:EllipseImage Source="your_image_path.jpg" />

</ContentPage>