edgeDstAsync method
Returns the edge destination.
https://docs.opencv.org/4.x/df/dbf/classcv_1_1Subdiv2D.html#aee192f95bf19c74619641496c457586d
Implementation
Future<(int rval, Point2f dstpt)> edgeDstAsync(int edge) async {
  final pp = calloc<cvg.CvPoint2f>();
  final p = calloc<ffi.Int>();
  return cvRunAsync0((callback) => cimgproc.cv_Subdiv2D_edgeDst(ref, edge, pp, p, callback), (c) {
    final rval = (p.value, Point2f.fromPointer(pp));
    calloc.free(p);
    return c.complete(rval);
  });
}