PFNGLBITMAPPROCDart typedef
        PFNGLBITMAPPROCDart =
     void Function(int width, int height, double xorig, double yorig, double xmove, double ymove, Pointer<Uint8>  bitmap)
    
    
    
Implementation
typedef PFNGLBITMAPPROCDart =
    void Function(
      int width,
      int height,
      double xorig,
      double yorig,
      double xmove,
      double ymove,
      Pointer<Uint8> bitmap,
    );