Bitmap blur util for Xamarin Android

BitmapExtensions.cs

using Android.App;
using Android.Support.V8.Renderscript;

namespace Droid
{
    public static class BitmapUtil
    {
        public static Bitmap Blur(Bitmap originalBitmap)
        {
            // Create the Renderscript instance that will do the work.
            RenderScript rs = RenderScript.Create(Application.Context);

            // Allocate memory for Renderscript to work with
            Allocation input = Allocation.CreateFromBitmap(rs, originalBitmap, Allocation.MipmapControl.MipmapFull, (int)Renderscripts.AllocationUsage.Script);
            Allocation output = Allocation.CreateTyped(rs, input.Type);

            // Load up an instance of the specific script that we want to use.
            ScriptIntrinsicBlur script = ScriptIntrinsicBlur.Create(rs, Element.U8_4(rs));
            script.SetInput(input);

            // Set the blur radius
            script.SetRadius(25);

            // Start the ScriptIntrinisicBlur
            script.ForEach(output);

            // Copy the output to the blurred bitmap
            output.CopyTo(originalBitmap);
            
            return originalBitmap;
        }
    }
}