Xamarin.Forms:用框架将图像裁剪成圆形不能完全裁剪

using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;

[assembly: ExportRenderer(typeof(CircularImage), typeof(CircularImageRenderer))]
namespace YourNamespace.Droid
{
    public class CircularImageRenderer : ImageRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<Image> e)
        {
            base.OnElementChanged(e);
            if (Control != null)
            {
                Control.SetClipToOutline(true);
                Control.OutlineProvider = new CircularOutlineProvider();
            }
        }
    }

    public class CircularOutlineProvider : ViewOutlineProvider
    {
        public override void GetOutline(View view, Outline outline)
        {
            base.GetOutline(view, outline);
            var rect = new Rect(0, 0, view.Width, view.Height);
            outline.SetRoundRect(rect, view.Height / 2);
        }
    }
}

public class CircularImage : Image
{
    public CircularImage()
    {
        this.Source = "your_image_path";
    }
}

dotnet add package Xamarin.Forms.CircularImage

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:circular="clr-namespace:Xamarin.Forms.CircularImage;assembly=Xamarin.Forms.CircularImage"
             x:Class="YourNamespace.MainPage">
    <StackLayout>
        <circular:CircularImage Source="your_image_path" />
    </StackLayout>
</ContentPage>