DirectFB Reference Manual
IDirectFBSurface   Flip

Flip the two buffers of the surface.

Flip (
  IDirectFBSurface *thiz
  const DFBRegion *region
  DFBSurfaceFlipFlags flags
);

If no region is specified the whole surface is flipped, otherwise blitting is used to update the region. This function fails if the surfaces capabilities don't include DSCAPS_FLIPPING.

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