Custom RadImageEditor Win2D GaussianBlur Tool

GaussianBlurTool.cs

using System;
using System.Diagnostics;
using System.Threading.Tasks;
using Windows.Storage.Streams;
using Windows.UI.Xaml.Media.Imaging;
using Microsoft.Graphics.Canvas;
using Microsoft.Graphics.Canvas.Effects;
using Telerik.UI.Xaml.Controls.Input.ImageEditor;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.ApplicationModel.Core;
using Windows.UI.Core;

namespace RadImageEditorAndWin2D.CustomTools
{
    public class GaussianBlurTool : RangeTool
    {
        public override string Name => "Gaussian Blur";

        public override string Icon => "ms-appx:///CustomTools/ToolIcons/blur.png";
        
        public override double Min => 0; //Maximum value for the slider

        public override double Max => 20; //Minimum value for the slider
        
        protected override async Task<WriteableBitmap> ApplyCore(IRandomAccessStream stream, WriteableBitmap targetBitmap)
        {
            try
            {
                stream.Seek(0);

                using (var device = CanvasDevice.GetSharedDevice())
                using (CanvasBitmap cbm = await CanvasBitmap.LoadAsync(device, stream))
                using (CanvasRenderTarget renderer = new CanvasRenderTarget(device, cbm.SizeInPixels.Width, cbm.SizeInPixels.Height, cbm.Dpi))
                using (CanvasDrawingSession ds = renderer.CreateDrawingSession())
                {
                    var blur = new GaussianBlurEffect
                    {
                        BlurAmount = (float) this.Value,
                        Source = cbm
                    };

                    ds.DrawImage(blur);
                    ds.Flush(); //important, this forces the drawing operation to complete
                    
                    await CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.High, () =>
                    {
                        //IMPORTANT NOTE:
                        //You need to add using System.Runtime.InteropServices.WindowsRuntime in order to use CopyTo(IBuffer)
                        renderer.GetPixelBytes().CopyTo(targetBitmap.PixelBuffer);
                    });
                }

                return targetBitmap;
            }
            catch (Exception ex)
            {
                Debug.WriteLine($"ApplyCore in GaussianBlurTool Exception: {ex}");
                throw;
            }
        }
    }
}