drawBitmap method
Implementation
@override
Future<int?> drawBitmap(Uint8List bmp, int xDest, int yDest) async {
Map<String, dynamic> param = <String, dynamic>{};
param['bmp'] = bmp;
param['xDest'] = xDest;
param['yDest'] = yDest;
return await methodChannel.invokeMethod<int>('drawBitmap', param);
}