Reference Manual - 1.2.6
IDirectFBDisplayLayer   SetRotation

Set the rotation of data within the layer.

DFBResult SetRotation (
  IDirectFBDisplayLayer   * thiz,
  int   rotation
);

Only available in exclusive or administrative mode.

Any rotation other than 0 or 180 is not supported yet.

No layer hardware feature usage, only rotated blitting yet.

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