Surface Interfaces
DirectDrawSurface objects expose their functionality through the IDirectDrawSurface interfaces.
Each new interface version provides the same utility as its predecessors, with additional options available through new methods.
When you create a surface by calling the IDirectDraw::CreateSurface method (or another creation method from IDirectDraw), you receive a pointer to the surface's IDirectDrawSurface interface.
If you want to work with a different iteration (in particular IDirectDrawSurface) of the interface, you must query for it.
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