splitImage method

Future<List<Uint8List>> splitImage(Uint8List uintImage, int maxHeight)

Splits the given image into vertical parts of specified maximum height

Implementation

Future<List<Uint8List>> splitImage(Uint8List uintImage, int maxHeight) async {
  final List<Uint8List> parts = <Uint8List>[];

  /// Load the image from bytes
  ///
  final ui.Image image = await _loadImage(uintImage);

  /// Calculate the number of vertical parts needed
  ///
  final int yParts = (maxHeight == 0) ? 1 : (image.height / maxHeight).ceil();
  final int partHeight = (image.height / yParts).round();

  /// Iterate over each vertical part
  ///
  for (int i = 0; i < yParts; i++) {
    /// Extract a part of the image
    ///
    final ui.Image partImage = await _extractImagePart(
        image, 0, i * partHeight, image.width, partHeight);

    /// Convert the extracted image part to byte data
    ///
    final Uint8List? partBytes = await _imageToByteData(partImage);

    /// Add the byte data of the part to the list if it's not null
    ///
    if (partBytes != null) {
      parts.add(partBytes);
    }
  }

  return parts;
}