DirectFB Reference Manual
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.

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