PFNGLREADNPIXELSPROCDart typedef
        PFNGLREADNPIXELSPROCDart =
     void Function(int x, int y, int width, int height, int format, int type, int bufSize, Pointer<NativeType>  data)
    
    
    
Implementation
typedef PFNGLREADNPIXELSPROCDart =
    void Function(
      int x,
      int y,
      int width,
      int height,
      int format,
      int type,
      int bufSize,
      Pointer<NativeType> data,
    );