toImgImage method

Image toImgImage(CameraImage cameraImage)

Converts the raw camera image into a platform-appropriate image format.

On Android, the YUV420 format is converted into a standard image format. On iOS, the BGRA8888 format is handled with padding removal if needed. Throws an exception if the camera format is unsupported.

Implementation

img.Image toImgImage(CameraImage cameraImage) {
  if (Platform.isAndroid) {
    return _yuv420ToImage(cameraImage);
  }

  if (Platform.isIOS) {
    final plane = cameraImage.planes[0];
    final int width = cameraImage.width;
    final int height = cameraImage.height;
    final int bytesPerRow = plane.bytesPerRow;
    final Uint8List bytes = plane.bytes;

    // Check if row padding exists on iOS and remove if necessary
    final bool hasPadding = bytesPerRow != width * 4;

    if (!hasPadding) {
      final Uint8List cleanBytes = Uint8List.fromList(bytes);
      return img.Image.fromBytes(
        width: width,
        height: height,
        bytes: cleanBytes.buffer,
        order: img.ChannelOrder.bgra,
      );
    }

    // Handle row padding by stripping it out
    final Uint8List cleanBytes = Uint8List(width * height * 4);
    int dstIdx = 0;
    for (int y = 0; y < height; y++) {
      final int rowStart = y * bytesPerRow;
      final int rowBytes = width * 4;
      cleanBytes.setRange(dstIdx, dstIdx + rowBytes, bytes, rowStart);
      dstIdx += rowBytes;
    }

    return img.Image.fromBytes(
      width: width,
      height: height,
      bytes: cleanBytes.buffer,
      order: img.ChannelOrder.bgra,
    );
  }

  throw Exception('Camera format not supported: ${cameraImage.format.group}');
}