Is there memory issue with isolate in flutter app?

Question

I have a problem about memory with flutter app, when using compute, I put this line in the function parameter in compute:

var image = imglib.Image.fromBytes(         


        

Answer 1

To try to reproduce with your sample, I had to convert from a ui.Image first:

Future _bytePng(ui.Image image) async {
  ByteData byteData = await image.toByteData(format: ui.ImageByteFormat.rawRgba);
  Uint8List byteList = byteData.buffer.asUint8List(byteData.offsetInBytes, byteData.lengthInBytes);
  return byteList;
}

The run a simplified version of your sample:

imglib.Image image2 = await compute(_getImage, [image1.width, image1.height, byteList]);


Future _getImage(List values) async {
  var temp = imglib.Image.fromBytes(values[0], values[1], values[2], format: imglib.Format.bgra);

  var rng = new Random().nextInt(50);
  imglib.Image cropped = imglib.copyCrop(temp, 0, 0, temp.width - rng, temp.height - rng);

  return cropped;
}

But I wasn't able to see the memory go out of control. So you probably have something else going on.