Function invalidate

src/OpenLoco/src/ViewportManager.cpp:186–229

    }

    static void invalidate(const ViewportRect& rect, ZoomLevel zoom)
    {
        for (auto& viewport : _viewports)
        {
            // Skip destroyed viewports.
            if (viewport.isValid() == 0)
            {
                continue;
            }

            // Skip if zoomed out further than zoom argument
            if (viewport.zoom > (uint8_t)zoom)
            {
                continue;
            }

            if (!viewport.intersects(rect))
            {
                continue;
            }

            auto intersection = viewport.getIntersection(rect);

            // offset rect by (negative) viewport origin
            int16_t left = intersection.left - viewport.viewX;
            int16_t right = intersection.right - viewport.viewX;
            int16_t top = intersection.top - viewport.viewY;
            int16_t bottom = intersection.bottom - viewport.viewY;

            // apply zoom
            left = left >> viewport.zoom;
            right = right >> viewport.zoom;
            top = top >> viewport.zoom;
            bottom = bottom >> viewport.zoom;

            // offset calculated area by viewport offset
            left += viewport.x;
            right += viewport.x;
            top += viewport.y;
            bottom += viewport.y;

            Gfx::invalidateRegion(left, top, right, bottom);
        }
    }

    // 0x004CBA2D
    void invalidate(Station* station)