Added clipping to VisualBrush.DestinationRect.

src/Perspex.SceneGraph/Rendering/RendererBase.cs

@@ -43,9 +43,11 @@ namespace Perspex.Rendering
         /// <param name="visual">The visual to render.</param>
         /// <param name="handle">An optional platform-specific handle.</param>
         /// <param name="transform">The transform.</param>
-        public virtual void Render(IVisual visual, IPlatformHandle handle, Matrix transform)
+        /// <param name="clip">An optional clip rectangle.</param>
+        public virtual void Render(IVisual visual, IPlatformHandle handle, Matrix transform, Rect? clip = null)
         {
             using (var context = this.CreateDrawingContext(handle))
+            using (clip.HasValue ? context.PushClip(clip.Value) : null)
             {
                 this.Render(visual, context, Matrix.Identity, transform);
             }

src/Windows/Perspex.Direct2D1/Media/VisualBrushImpl.cs

@@ -40,7 +40,7 @@ namespace Perspex.Direct2D1.Media
                 var transform = Matrix.CreateTranslation(-sourceRect.Position) *
                                 Matrix.CreateScale(scale) *
                                 Matrix.CreateTranslation(translate);
-                renderer.Render(visual, null, transform);
+                renderer.Render(visual, null, transform, destinationRect);
 
                 var result = new BitmapBrush(brt, brt.Bitmap);
                 this.PlatformBrush = result;

tests/Perspex.RenderTests/Media/VisualBrushTests.cs

@@ -320,5 +320,43 @@ namespace Perspex.Direct2D1.RenderTests.Media
             this.RenderToFile(target);
             this.CompareImages();
         }
+
+        [Fact]
+        public void VisualBrush_SourceRect_DestinationRect_Absolute()
+        {
+            Decorator target = new Decorator
+            {
+                Padding = new Thickness(8),
+                Width = 200,
+                Height = 200,
+                Child = new Rectangle
+                {
+                    Fill = new VisualBrush
+                    {
+                        SourceRect = new RelativeRect(40, 40, 100, 100, OriginUnit.Pixels),
+                        DestinationRect = new RelativeRect(92, 92, 92, 92, OriginUnit.Pixels),
+                        Visual = new Border
+                        {
+                            Width = 180,
+                            Height = 180,
+                            Background = Brushes.Red,
+                            BorderBrush = Brushes.Black,
+                            BorderThickness = 2,
+                            Child = new Ellipse
+                            {
+                                Width = 100,
+                                Height = 100,
+                                Fill = Brushes.Yellow,
+                                VerticalAlignment = VerticalAlignment.Center,
+                                HorizontalAlignment = HorizontalAlignment.Center,
+                            }
+                        }
+                    }
+                }
+            };
+
+            this.RenderToFile(target);
+            this.CompareImages();
+        }
     }
 }