Add deep clone support and picture manipulation in code

samples/AvaloniaSvgSkiaSample/MainWindow.axaml

@@ -189,6 +189,19 @@
       </DockPanel>
     </TabItem>
 
+    <TabItem Header="Cloning">
+      <DockPanel x:Name="svgCloningDockPanel" 
+                 Background="Transparent" 
+                 Margin="16" 
+                 VerticalAlignment="Stretch"
+                 HorizontalAlignment="Stretch">
+        <Grid ColumnDefinitions="*,*">
+          <Image Name="svgCloningOriginal" Source="{SvgImage /Assets/__tiger.svg}" />
+          <Image Grid.Column="1" Name="svgCloningClone" />
+        </Grid>
+      </DockPanel>
+    </TabItem>
+
   </TabControl>
 
 </Window>

samples/AvaloniaSvgSkiaSample/MainWindow.axaml.cs

@@ -1,13 +1,11 @@
-using System;
-using System.IO;
+using System.IO;
 using System.Linq;
 using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Input;
-using Avalonia.Markup.Xaml;
 using Avalonia.Media;
 using Avalonia.Svg.Skia;
-using SS = Svg.Skia;
+using ShimSkiaSharp;
 
 namespace AvaloniaSvgSkiaSample;
 
@@ -37,6 +35,32 @@ public MainWindow()
                <circle cx="50" cy="50" r="40" stroke="green" stroke-width="4" fill="yellow" />
             </svg>
             """;
+
+        var svgImage = svgCloningOriginal.Source as SvgImage;
+        var clone = new SvgImage { Source = svgImage?.Source?.Clone() };
+
+        foreach (var cmd in clone.Source?.Svg?.Model?.Commands?.OfType<DrawPathCanvasCommand>() ?? [])
+        {
+            var paint = cmd.Paint;
+            if (paint?.Color is not null)
+            {
+                paint.Color = ToGrayscale(paint.Color.Value);
+            }
+
+            if (paint?.Shader is ColorShader shader)
+            {
+                paint.Shader = SKShader.CreateColor(ToGrayscale(paint.Color.Value), shader.ColorSpace);
+            }
+        }
+
+        clone.Source?.RebuildFromModel();
+        svgCloningClone.Source = clone;
+    }
+
+    private static SKColor ToGrayscale(SKColor color)
+    {
+        var luminance = (byte)(0.2126f * color.Red + 0.7152f * color.Green + 0.0722f * color.Blue);
+        return new SKColor(luminance, luminance, luminance, color.Alpha);
     }
 
     public void SvgSvgStretchChanged(object sender, SelectionChangedEventArgs e)