Fix TransformOrigin for brushes (#15037)

src/Skia/Avalonia.Skia/DrawingContextImpl.cs

@@ -1158,7 +1158,10 @@ namespace Avalonia.Skia
 
             if (content.Transform is not null)
             {
-                transform = content.Transform.Value * transform;
+                var transformOrigin = content.TransformOrigin.ToPixels(targetRect);
+                var offset = Matrix.CreateTranslation(transformOrigin);
+
+                transform *= -offset * content.Transform.Value * offset;
             }
 
             var calc = new TileBrushCalculator(tileBrush, contentSize, targetRect.Size);

src/Windows/Avalonia.Direct2D1/Media/DrawingContextImpl.cs

@@ -625,7 +625,10 @@ namespace Avalonia.Direct2D1.Media
 
                                 if (sceneBrush?.Transform is not null)
                                 {
-                                    ctx.Transform *= sceneBrush.Transform.Value;
+                                    var transformOrigin = sceneBrushContent.TransformOrigin.ToPixels(rect);
+                                    var offset = Matrix.CreateTranslation(transformOrigin);
+
+                                    ctx.Transform = -offset * sceneBrush.Transform.Value * offset;
                                 }
                                 
                                 sceneBrushContent.Render(ctx,

tests/Avalonia.RenderTests/Media/ImageBrushTests.cs

@@ -490,5 +490,36 @@ namespace Avalonia.Direct2D1.RenderTests.Media
             
             CompareImages();
         }
+
+        [Fact]
+        public async Task ImageBrush_Should_Render_With_TransformOrigin()
+        {
+            var image = new Image
+            {
+                Width = 200,
+                Height = 200,
+                Source = new DrawingImage
+                {
+                    Drawing = new GeometryDrawing
+                    {
+                        Brush = new DrawingBrush
+                        {
+                            Transform = new RotateTransform(45),
+                            TransformOrigin = new RelativePoint(.5,.5, RelativeUnit.Relative),
+                            Drawing = new GeometryDrawing
+                            {
+                                Brush = Brushes.MediumBlue,
+                                Geometry = new RectangleGeometry { Rect = new Rect(0, 0, 48, 48) }
+                            }
+                        },
+                        Geometry = new RectangleGeometry { Rect = new Rect(0, 0, 48, 48) }
+                    }
+                }
+            };
+
+            await RenderToFile(image);
+
+            CompareImages();
+        }
     }
 }