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Two methods are available for copying images to a DirectDraw surface: IDirectDrawSurface5::Bltand IDirectDrawSurface5::BltFast. (A third method, IDirectDrawSurface5::BltBatch, is not implemented in this version of DirectX.) These methods are called on the destination surface and receive the source surface as a parameter. The destination and source surfaces can be one and the same, and you don't have to worry about overlapDirectDraw takes care to preserve all source pixels before overwriting them.
Of the two implemented methods, Bltis the more flexible and BltFastis the fasterbut only if there is no hardware blitter. You can determine the blitting capabilities of the hardware from the DDCAPSstructure obtained in the lpDDDriverCapsparameter of the IDirectDraw4::GetCapsmethod. If the dwCapsmember contains DDCAPS_BLT, the hardware has at least minimal blitting capabilities.
Last updated on Tuesday, May 18, 2004