[This documentation is for preview only, and is subject to change in later releases. Blank topics are included as placeholders.]
Paints an area with cached content.
(in PresentationCore.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation
'Usage
Dim instance As BitmapCacheBrush
'Declaration
Public NotInheritable Class BitmapCacheBrush _
Inherits Brush
Use the BitmapCacheBrush class to reuse a cached element efficiently. This is useful when you need to paint complex content onto multiple elements. Use the BitmapCache class to cache a complex element.
Assign a Visual to the Target property and optionally assign a BitmapCache to the BitmapCache property. The CacheMode of the brush and the target Visual interact to produce different behaviors. The following table describes this interaction.
| Target has no CacheMode | Target has CacheMode |
|---|
Brush has no CacheMode | Target visual renders normally; brush uses default cache behavior. | Target visual renders into its own cache; brush uses target’s cache when rendering. |
Brush has CacheMode | Target visual renders normally; brush renders target into its own cache and uses this to render. | Target visual renders into its own cache; brush renders target into brush's own cache and uses this to render. |
The BitmapCacheBrush class is similar to the VisualBrush class, but BitmapCacheBrush always renders from a cache on the target element, or from a cache defined by the BitmapCache property. The BitmapCacheBrush class also supports dirty regions.
The following table shows the default bitmap cache settings for the BitmapCacheBrush class.
The SnapsToDevicePixels property is ignored by the BitmapCacheBrush class.
The BitmapCacheBrush class ignores the following properties on the root Visual. This behavior differs from the VisualBrush class.
The following code example shows how to associate a BitmapCache with a BitmapCacheBrush. You can use the BitmapCacheBrush resource on multiple elements and achieve good performance. For the complete code listing, see How to: Use a Cached Element as a Brush.
<Window.Resources>
<!-- Set the Source property to a valid image path. -->
<Image x:Key="cachedImage" Source="/BitmapCacheBrushDemo;component/space%20needle.jpg" >
<Image.CacheMode>
<BitmapCache EnableClearType="False"
RenderAtScale="1"
SnapsToDevicePixels="False" />
</Image.CacheMode>
</Image>
<BitmapCacheBrush x:Key="cachedImageBrush" Target="{StaticResource cachedImage}" />
</Window.Resources>
System..::.Object
System.Windows.Threading..::.DispatcherObject
System.Windows..::.DependencyObject
System.Windows..::.Freezable
System.Windows.Media.Animation..::.Animatable
System.Windows.Media..::.Brush
System.Windows.Media..::.BitmapCacheBrush
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008, Windows Server 2003
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
.NET Framework
Supported in: 4
.NET Framework Client Profile
Supported in: 4
Reference
Other Resources
