compareAsync method
Implementation
@override
Future<double> compareAsync(InputArray hashOne, InputArray hashTwo) async {
final p = calloc<ffi.Double>();
return cvRunAsync0(
(callback) => ccontrib.cv_img_hash_BlockMeanHash_compare(ref, hashOne.ref, hashTwo.ref, p, callback),
(c) {
final rval = p.value;
calloc.free(p);
return c.complete(rval);
},
);
}