pack method

@override Uint8List pack()

Corresponding parser should be called from frame_app data handler

Implementation

@override
Uint8List pack() {
  int widthMsb = _width >> 8;
  int widthLsb = _width & 0xFF;
  int lineHeightMsb = _lineHeight >> 8;
  int lineHeightLsb = _lineHeight & 0xFF;

  // special marker for Block header 0xFF, width of the block, max display rows, num lines, offsets within block for each line
  return Uint8List.fromList([
    0xFF,
    widthMsb,
    widthLsb,
    lineHeightMsb,
    lineHeightLsb,
    _maxDisplayLines & 0xFF
  ]);
}