Reference Manual - 1.4.3
IDirectFBWindow   GetSurface

Get an interface to the backing store surface.

DFBResult GetSurface (
  IDirectFBWindow   * thiz,
  IDirectFBSurface   ** ret_surface
);

This surface has to be flipped to make previous drawing commands visible, i.e. to repaint the windowstack for that region.

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