Reference Manual - 1.4.3
IDirectFB   GetDisplayLayer

Retrieve an interface to a specific display layer.

DFBResult GetDisplayLayer (
  IDirectFB   * thiz,
  DFBDisplayLayerID   layer_id,
  IDirectFBDisplayLayer   ** ret_interface
);

The default layer_id is DLID_PRIMARY. Others can be obtained using IDirectFB::EnumDisplayLayers().

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