Function adjustSurfaceHeight

src/OpenLoco/src/Map/TileManager.cpp:1324–1498

0x00468651

    // 0x00468651
    uint32_t adjustSurfaceHeight(World::Pos2 pos, SmallZ targetBaseZ, uint8_t slopeFlags, World::TileClearance::RemovedBuildings& removedBuildings, uint8_t flags)
    {
        if (!validCoords(pos))
        {
            GameCommands::setErrorText(StringIds::off_edge_of_map);
            return GameCommands::kFailure;
        }

        if (targetBaseZ < 4)
        {
            GameCommands::setErrorText(StringIds::error_too_low);
            return GameCommands::kFailure;
        }
        if (targetBaseZ > 160
            || (targetBaseZ == 160 && (slopeFlags & 0x1F) != 0)
            || (targetBaseZ == 156 && (slopeFlags & 0x10) != 0))
        {
            GameCommands::setErrorText(StringIds::error_too_high);
            return GameCommands::kFailure;
        }

        currency32_t totalCost = 0;

        if (flags & GameCommands::Flags::apply)
        {
            removeSurfaceIndustry(pos);

            if (!SceneManager::isEditorMode())
            {
                setTerrainStyleAsCleared(pos);
            }

            auto clearHeight = getHeight(pos).landHeight;
            removeAllWallsOnTileAbove(toTileSpace(pos), clearHeight / 4);
        }

        // Compute cost of landscape operation
        auto tile = get(pos);
        auto* surface = tile.surface();
        auto landObj = ObjectManager::get<LandObject>(surface->terrain());
        totalCost += Economy::getInflationAdjustedCost(landObj->costFactor, landObj->costIndex, 10);

        auto targetClearZ = targetBaseZ;
        if (slopeFlags & 0x1F)
        {
            targetClearZ += kSmallZStep;
        }
        if (slopeFlags & SurfaceSlope::doubleHeight)
        {
            targetClearZ += kSmallZStep;
        }

        // If surface is in use as a water(route), and has water, ensure we don't remove it
        if (surface->hasType6Flag() && surface->water() > 0)
        {
            auto waterHeight = (surface->water() - 1) * kMicroToSmallZStep;

            if (waterHeight < targetClearZ)