Function ScreenGetMapXY

src/openrct2/interface/Viewport.cpp:1811–1844

* * rct2: 0x00688972 * In: * screen_x: eax * screen_y: ebx * Out: * x: ax * y: bx * tile_element: edx ? * viewport: edi */

     *      viewport: edi
     */
    std::optional<CoordsXY> ScreenGetMapXY(const ScreenCoordsXY& screenCoords, Viewport** viewport)
    {
        auto* windowMgr = Ui::GetWindowManager();

        // This will get the tile location but we will need the more accuracy
        WindowBase* window = windowMgr->FindFromPoint(screenCoords);
        if (window == nullptr || window->viewport == nullptr)
        {
            return std::nullopt;
        }
        auto myViewport = window->viewport;
        auto info = GetMapCoordinatesFromPosWindow(window, screenCoords, EnumsToFlags(ViewportInteractionItem::terrain));
        if (info.interactionType == ViewportInteractionItem::none)
        {
            return std::nullopt;
        }

        auto start_vp_pos = myViewport->ScreenToViewportCoord(screenCoords);
        CoordsXY cursorMapPos = info.Loc.ToTileCentre();

        // Iterates the cursor location to work out exactly where on the tile it is
        for (int32_t i = 0; i < 5; i++)
        {
            int32_t z = TileElementHeight(cursorMapPos);
            cursorMapPos = ViewportPosToMapPos(start_vp_pos, z, myViewport->rotation);
            cursorMapPos.x = std::clamp(cursorMapPos.x, info.Loc.x, info.Loc.x + 31);
            cursorMapPos.y = std::clamp(cursorMapPos.y, info.Loc.y, info.Loc.y + 31);
        }

        if (viewport != nullptr)
            *viewport = myViewport;

        return cursorMapPos;
    }

    /**
     *