Cairo.NativeMethods.cairo_surface_reference C# (CSharp) Метод

        internal static extern IntPtr cairo_surface_reference(IntPtr surface);

 protected Surface(IntPtr ptr, bool owns)
 {
     surface = ptr;
     lock (surfaces.SyncRoot){
         surfaces [ptr] = this;
     }
     if (!owns)
     {
         NativeMethods.cairo_surface_reference(ptr);
     }
 }