Function isLayerAt

library/include/modules/MapCache.h:160–165

Check if the base layer tile is layer stone or soil

    }
    /// Check if the base layer tile is layer stone or soil
    bool isLayerAt(df::coord2d p)
    {
        using namespace df::enums::tiletype_material;
        auto tm = tileMaterial(baseTiletypeAt(p));
        return tm == STONE || tm == SOIL;
    }

    /// Vein material at pos (even if there is no vein tile), or -1 if none
    int16_t veinMaterialAt(df::coord2d p)