Function destroy

src/OpenLoco/src/ViewportManager.cpp:52–61

    }

    void destroy(Viewport* vp)
    {
        assert(vp->isValid());

        vp->width = 0;
        while (!_viewports.empty() && _viewports.back().width == 0)
        {
            _viewports.pop_back();
        }
    }

    static Viewport* initViewport(Ui::Point origin, Ui::Size size, ZoomLevel zoom)
    {