process static method

Future<String> process({ required XFile shot, required DeviceOrientation orientation, required bool fourThree, })

Implementation

static Future<String> process({
  required XFile shot,
  required DeviceOrientation orientation,
  required bool fourThree,
}) async {
  print(
      '📸 PhotoProcessor: platform=${Platform.operatingSystem}, orientation=$orientation');

  final bytes = await shot.readAsBytes();
  final decoded = img.decodeImage(bytes);
  if (decoded == null) return shot.path;

  img.Image imgOut = decoded;
  print('📸 original size = ${decoded.width}x${decoded.height}');

  switch (orientation) {
    case DeviceOrientation.landscapeLeft:
      print('📸 rotating 270° (landscapeLeft)');
      imgOut = img.copyRotate(imgOut, angle: 270);
      break;
    case DeviceOrientation.landscapeRight:
      print('📸 rotating 90° (landscapeRight)');
      imgOut = img.copyRotate(imgOut, angle: 90);
      break;
    case DeviceOrientation.portraitDown:
      print('📸 rotating 180° (portraitDown)');
      imgOut = img.copyRotate(imgOut, angle: 180);
      break;
    default:
      print('📸 no rotation (portraitUp or unknown)');
      break;
  }

  print('📸 after rotation size = ${imgOut.width}x${imgOut.height}');

  final w = imgOut.width;
  final h = imgOut.height;
  final bool isPortrait;
  if (Platform.isAndroid) {
    isPortrait = orientation == DeviceOrientation.portraitUp;
  } else {
    isPortrait = h >= w;
  }

  final wantRatio = fourThree
      ? (isPortrait ? 3 / 4 : 4 / 3)
      : (isPortrait ? 9 / 16 : 16 / 9);

  print('📸 isPortrait=$isPortrait, wantRatio=$wantRatio');

  final curRatio = w / h;
  const eps = 0.01;

  if ((curRatio - wantRatio).abs() > eps) {
    int cropW, cropH;
    if (curRatio > wantRatio) {
      cropH = h;
      cropW = (h * wantRatio).round();
    } else {
      cropW = w;
      cropH = (w / wantRatio).round();
    }

    final x = ((w - cropW) / 2).round();
    final y = ((h - cropH) / 2).round();

    imgOut = img.copyCrop(
      imgOut,
      x: x,
      y: y,
      width: cropW,
      height: cropH,
    );
  }

  await File(shot.path).writeAsBytes(img.encodeJpg(imgOut));
  return shot.path;
}