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 {
  debugPrint('📸 iOS PhotoProcessor: orientation = $orientation');

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

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

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

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

  // Landscape orientations need an extra rotation: iOS reports orientation
  // before the camera sensor rotation is applied, so we have to flip back.
  if (orientation == DeviceOrientation.landscapeLeft) {
    imgOut = img.copyRotate(imgOut, angle: 270);
    debugPrint('📸 iOS: after correction size = ${imgOut.width}x${imgOut.height}');
  } else if (orientation == DeviceOrientation.landscapeRight) {
    imgOut = img.copyRotate(imgOut, angle: 90);
    debugPrint('📸 iOS: after correction size = ${imgOut.width}x${imgOut.height}');
  }

  final w = imgOut.width, h = imgOut.height;
  final isPortrait = h > w;
  final wantRatio = fourThree
      ? (isPortrait ? 3 / 4 : 4 / 3)
      : (isPortrait ? 9 / 16 : 16 / 9);

  debugPrint('📸 iOS: 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;
}