WPF CombinedGeometry GeometryCombineMode GeometryDrawing Image ImageSource DrawingImage

<Window x:Class="WpfApp45.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp45" WindowState="Maximized"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Window.Resources>
        <CombinedGeometry x:Key="ringGeometry"
                          GeometryCombineMode="Exclude">
            <CombinedGeometry.Geometry1>
                <EllipseGeometry Center="100,100" RadiusX="100" RadiusY="100"/>
            </CombinedGeometry.Geometry1>
            <CombinedGeometry.Geometry2>
                <EllipseGeometry Center="100,100" RadiusX="80" RadiusY="80"/>
            </CombinedGeometry.Geometry2>
        </CombinedGeometry>
        <GeometryDrawing x:Key="ringDrawing" Geometry="{StaticResource ringGeometry}"
                         Brush="Red">
            <GeometryDrawing.Pen>
                <Pen Brush="Black" Thickness="3"/>
            </GeometryDrawing.Pen>
        </GeometryDrawing>
    </Window.Resources>
    <Grid>
        <Image>
            <Image.Source>
                <DrawingImage Drawing="{StaticResource ringDrawing}"/>
            </Image.Source>
        </Image>
    </Grid>
</Window>