imageReprStream method

@override Stream<Image?> imageReprStream()

Implementation

@override
Stream<img.Image?> imageReprStream() async* {
  final stream = scanEventChannel.receiveBroadcastStream();
  await for (final bytes in stream) {
    if (bytes != null) {
      // this should only occur on mac
      if (Platform.isWindows) {
        var decodedImg = img.decodePng(bytes);
        // try out some other formats before returning null eventually
        decodedImg ??= img.decodeBmp(bytes);
        decodedImg ??= img.decodeTiff(bytes);
        try {
          // throws an ImageException if data is really not a JPG; see https://github.com/brendan-duncan/image/issues/101
          decodedImg ??= img.decodeJpg(bytes);
        } on img.ImageException {
          yield null;
        }
        yield decodedImg;
      } else if (Platform.isLinux) {
        yield img.decodePnm(bytes);
      } else if (Platform.isMacOS) {
        var convertedBytes = bytes is! Uint8List ? Uint8List.fromList(List<int>.from(bytes)) : bytes;
        yield img.decodePng(convertedBytes);
      }
    } else {
      yield null;
    }
  }
}