procedure Blt( pDestRect: PRect; SrcSurface: TDirectDrawSurface; pSrcRect: PRect ; Flags: Longint; pBltFx: PDDBLTFX );
Calls the interface Blt method to perform a bit block transfer. When SrcSurface is irrelevant you can set it to nil. See IDirectDrawSurface3::Blt for more information.
See also DDBLTFX.