insertAsync method
Insert multiple points into a Delaunay triangulation.
https://docs.opencv.org/4.x/df/dbf/classcv_1_1Subdiv2D.html#a37223a499032ef57364f1372ad0c9c2e
Implementation
Future<int> insertAsync(Point2f pt) async =>
cvRunAsync((callback) => cffi.Subdiv2D_Insert_Async(ref, pt.ref, callback), intCompleter);