downloadBmpImageTsplCommandData method
转成打印机可识别的tspl命令数据
`pos`
打印的x,y位置
Implementation
Future<Uint8List> downloadBmpImageTsplCommandData(
{required (int, int) pos}) =>
RustLib.instance.api
.crateApiImageBitmapImageDownloadBmpImageTsplCommandData(
that: this, pos: pos);