Reference Manual - 1.0.0
IDirectFBSurface   StretchBlit

Blit an area scaled from the source to the destination rectangle.

StretchBlit (
  IDirectFBSurface   * thiz,
  IDirectFBSurface   * source,
  const DFBRectangle   * source_rect,
  const DFBRectangle   * destination_rect
);

Pass a NULL rectangle to use the whole source surface.