Reference Manual - 0.9.25
IDirectFBSurface   Blit

Blit an area from the source to this surface.

Blit (
  IDirectFBSurface   * thiz,
  IDirectFBSurface   * source,
  const DFBRectangle   * source_rect,
  int   x,
  int   y
);

Pass a NULL rectangle to use the whole source surface. Source may be the same surface.