WPF制作表示透明区域的马赛克画刷

最近在用WPF制作一款软件，需要像ps一样表示透明区域，于是制作了一个马赛克背景的style。实现比较简单，那么过程和思路就不表了，直接上代码

<DrawingBrush TileMode="Tile" Stretch="Uniform" ViewportUnits="Absolute" Viewport="0,0,16,16">
                    <DrawingBrush.Drawing>
                        <DrawingGroup>
                            <DrawingGroup.Children>
                                <GeometryDrawing Brush="White">
                                    <GeometryDrawing.Geometry>
                                        <RectangleGeometry Rect="0,0,10,10"/>
                                    </GeometryDrawing.Geometry>
                                </GeometryDrawing>
                                <GeometryDrawing Brush="#FFBFBFBF">
                                    <GeometryDrawing.Geometry>
                                        <RectangleGeometry Rect="0,0,5,5"/>
                                    </GeometryDrawing.Geometry>
                                </GeometryDrawing>
                                <GeometryDrawing Brush="#FFBFBFBF">
                                    <GeometryDrawing.Geometry>
                                        <RectangleGeometry Rect="5,5,5,5"/>
                                    </GeometryDrawing.Geometry>
                                </GeometryDrawing>
                            </DrawingGroup.Children>
                        </DrawingGroup>
                    </DrawingBrush.Drawing>
                </DrawingBrush>

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