Sets the Content property of this visual to the specified bitmap or window wrapper.
HRESULT SetContent( IUnknown *content );
The object that is the new content of this visual. This parameter can be NULL.
The content parameter must point to one of the following:
- An object that implements the IDCompositionSurface interface.
- An object that implements the IDXGISwapChain1 interface.
- A wrapper object that is returned by the CreateSurfaceFromHandle or CreateSurfaceFromHwnd method.
A visual can be associated with a bitmap object or a window wrapper. A bitmap is either a Microsoft DirectX swap chain or a Microsoft DirectComposition surface.
A window wrapper is created with the CreateSurfaceFromHwnd method and is a stand-in for the rasterization of another window, which must be a top-level window or a layered child window. A window wrapper is conceptually equivalent to a bitmap that is the size of the target window on which the contents of the window are drawn. The contents include the target window's child windows (layered or otherwise), and any DirectComposition content that is drawn in the child windows.
A DirectComposition surface wrapper is created with the CreateSurfaceFromHandle method and is a reference to a swap chain. An application might use a surface wrapper in a cross-process scenario where one process creates the swap chain and another process associates the bitmap with a visual.
The bitmap is always drawn at position (0,0) relative to the visual's coordinate system, although the coordinate system is directly affected by the OffsetX, OffsetY, and Transform properties, as well as indirectly by the transformations on ancestor visuals. The bitmap of a visual is always drawn behind the children of that visual.
|Minimum supported client||Windows 8 [desktop apps only]|
|Minimum supported server||Windows Server 2012 [desktop apps only]|