Would you be able to make this work for Flutter Web, I've been trying to read PDF417 codes using a webcam and haven't had any luck with my own ports or using system channels with / js workarounds.

In camera module we have an option to get stream of frames _controller.startImageStream( CameraImgae image => { } ) How can I decode it from that CameraImage object? In your example you decode it from Xpic file, but I prefer to decode it with stream because it should be more efficient for live decode

In addition, when I get the results, does it possible to get the positions of each result? like we can in flutter_zxing lib.

Hello, I'm trying to encode data matrix format.

try {
  var dataMatrixWriter = MultiFormatWriter();
  var encode = dataMatrixWriter.encode(
      'FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7',
      BarcodeFormat.DATA_MATRIX,
      48,
      48, {EncodeHintType.DATA_MATRIX_SHAPE : SymbolShapeHint.FORCE_SQUARE, EncodeHintType.MIN_SIZE: Dimension(48,48)});
  var scale = 15;
  var image = img.Image((encode.width + 2) * scale, (encode.height + 2) * scale);
  img.fill(image, Colors.white.value);
  for (var x = 0; x < encode.width; x++) {
    for (var y = 0; y < encode.height; y++) {
      if (encode.get(x, y)) {
        img.fillRect(image, (x + 1) * scale, (y + 1) * scale, (x + 1) * scale + scale,
            (y + 1) * scale + scale, Colors.black.value);
      }
    }
  }
  var pngBytes = img.encodePng(image);
  final File generatedImg = MemoryFileSystem().file('test_' + getRandomString(15));
  generatedImg.writeAsBytesSync(pngBytes);
  setState(() {
    _generatedImg = generatedImg;
  });
} catch (e, s) {
  print(s);
  print(e);
}

There are two errors:

• The borders of the matrix are not correct, see:

The first pixel must be black, the 2nd one white, the 3rd black, etc... Same thing for the second module, it starts with white instead of black.

• I cannot encode with a size more than 48x48 (example 52x52):

try {
  var encode = dataMatrixWriter.encode(
        'FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7FR03AV011E7F1E7',
        BarcodeFormat.DATA_MATRIX,
        52,
        52, {EncodeHintType.DATA_MATRIX_SHAPE : SymbolShapeHint.FORCE_SQUARE, EncodeHintType.MIN_SIZE: Dimension(52,52)});
} catch (e, s) {
  print(s);
  print(e);
}

I/flutter ( 6641): #0      _StringBase.substring (dart:core-patch/string_patch.dart:399:7)
I/flutter ( 6641): #1      StringBuilder.replace (package:zxing_lib/src/common/string_builder.dart:39:39)
I/flutter ( 6641): #2      StringBuilder.setCharAt (package:zxing_lib/src/common/string_builder.dart:28:5)
I/flutter ( 6641): #3      ErrorCorrection.encodeECC200 (package:zxing_lib/src/datamatrix/encoder/error_correction.dart:119:14)
I/flutter ( 6641): #4      DataMatrixWriter.encode (package:zxing_lib/src/datamatrix/data_matrix_writer.dart:84:40)
I/flutter ( 6641): #5      MultiFormatWriter.encode (package:zxing_lib/src/multi_format_writer.dart:87:19)
I/flutter ( 6641): #6      _FullScreenCertState.initState.<anonymous closure> (package:pass_sanitaire/main.dart:650:39)
I/flutter ( 6641): #7      _FullScreenCertState.initState.<anonymous closure> (package:pass_sanitaire/main.dart:647:34)
I/flutter ( 6641): #8      _rootRunUnary (dart:async/zone.dart:1436:47)
I/flutter ( 6641): #9      _CustomZone.runUnary (dart:async/zone.dart:1335:19)
I/flutter ( 6641): <asynchronous suspension>
I/flutter ( 6641): RangeError: Value not in range: 206

Is your feature request related to a problem? Please describe. 如题，我对比了 flutter_zxing（ffi）和 zxing_lib（dart）

1. 在有二维码/条形时，二者实时识别效率相差不大，甚至 zxing_lib 速度更快（0.006-0.02秒左右），表现更优
2. 在无二维码/条形时，flutter_zxing 的识别效率变化不大，而 zxing_lib 速度特别慢（1-3秒左右），这是完全无法接受的

Describe the solution you'd like 优化 zxing_lib 在无二维码/条形时的实时识别效率

Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered.

Additional context Add any other context or screenshots about the feature request here.