Function layerIndexAt

library/include/modules/MapCache.h:304–306

    int biomeIndexAt(df::coord2d p);
    int layerIndexAt(df::coord2d p) {
        return index_tile(designation,p).bits.geolayer_index;
    }

    df::coord2d biomeRegionAt(df::coord2d p);
    const BiomeInfo &biomeInfoAt(df::coord2d p);