Reference Manual - 1.8.0
IDirectFBSurface   FlipStereo

Flip/Update stereo surface buffers. Flips both the left and right buffers simultaneously to ensure synchronization between the two. Only applicable to window and layer surfaces with the DWCAPS_STEREO or DLOP_STEREO option set; will fail with all other surfaces.

DFBResult FlipStereo (
  IDirectFBSurface   * thiz,
  const DFBRegion   * left_region,
  const DFBRegion   * right_region,
  DFBSurfaceFlipFlags   flags

If no region is specified the whole surface is flipped, otherwise blitting is used to update the region. If surface capabilities don't include DSCAPS_FLIPPING, this method has the effect to make visible changes made to the surface contents.

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