Function ScreenGetMapXYSide

src/openrct2/interface/Viewport.cpp:1900–1908

* * rct2: 0x00689692 */

     *  rct2: 0x00689692
     */
    std::optional<CoordsXY> ScreenGetMapXYSide(const ScreenCoordsXY& screenCoords, uint8_t* side)
    {
        auto mapCoords = ScreenGetMapXY(screenCoords, nullptr);
        if (!mapCoords.has_value())
            return std::nullopt;

        *side = MapGetTileSide(*mapCoords);
        return mapCoords->ToTileStart();
    }

    /**
     *