getFromFile method

Future<File?> getFromFile(File file)

Implementation

Future<File?> getFromFile(File file) async {
  // Load the image from the file
  final image = await _loadImageFromFile(file);

  // Extract the part of the image inside the draggable container
  final recorder = ui.PictureRecorder();
  final canvas = Canvas(recorder);
  final srcRect = Rect.fromLTWH(
    _offset.dx * image.width / 301,
    _offset.dy * image.height / 301,
    _containerSize.width * image.width / 301,
    _containerSize.height * image.height / 301,
  );
  final dstRect =
      Rect.fromLTWH(0, 0, _containerSize.width, _containerSize.height);
  canvas.drawImageRect(image, srcRect, dstRect, Paint());

  // Convert the pixels to a byte buffer
  final imageByteData = await recorder
      .endRecording()
      .toImage(_containerSize.width.toInt(), _containerSize.height.toInt());
  final byteData =
      await imageByteData.toByteData(format: ui.ImageByteFormat.png);

  // Update the extracted image
  _extractedImage = byteData!.buffer.asUint8List();

  // Convert Uint8List to File
  return _unit8ListToFile(_extractedImage!);
}