imencodeAsync function

Future<(bool, Uint8List)> imencodeAsync(
  1. String ext,
  2. InputArray img, {
  3. VecI32? params,
})

async version of imencode

Implementation

Future<(bool, Uint8List)> imencodeAsync(
  String ext,
  InputArray img, {
  VecI32? params,
}) async {
  final buffer = VecUChar();
  final pSuccess = calloc<ffi.Bool>();
  final cExt = ext.toNativeUtf8().cast<ffi.Char>();

  void completeFunc(Completer<(bool, Uint8List)> c) {
    final success = pSuccess.value;
    calloc.free(cExt);
    calloc.free(pSuccess);

    final u8List = buffer.toU8List(); // will copy data
    buffer.dispose();
    return c.complete((success, u8List));
  }

  if (params == null) {
    return cvRunAsync0(
      (callback) => cimgcodecs.cv_imencode(cExt, img.ref, pSuccess, buffer.ptr, callback),
      completeFunc,
    );
  }
  return cvRunAsync0(
    (callback) => cimgcodecs.cv_imencode_1(cExt, img.ref, params.ref, pSuccess, buffer.ptr, callback),
    completeFunc,
  );
}