Reference Manual - 1.8.0
IDirectFBDisplayLayer   SetScreenLocation

Set location on screen as normalized values.

DFBResult SetScreenLocation (
  IDirectFBDisplayLayer   * thiz,
  float   x,
  float   y,
  float   width,
  float   height
);

So the whole screen is 0.0, 0.0, 1.0, 1.0.

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