Function get_entry_tiles

plugins/pathable.cpp:176–198

if entry_tiles is given, it is filled with the surface edge tiles that match one of the given depot pathability groups. If entry_tiles is NULL, just returns true if such a tile is found. returns false if no tiles are found

// depot pathability groups. If entry_tiles is NULL, just returns true if such a tile is found.
// returns false if no tiles are found
static bool get_entry_tiles(unordered_set<df::coord> * entry_tiles, const unordered_set<uint16_t> & depot_pathability_groups) {
    auto & edge = plotinfo->map_edge;
    size_t num_edge_tiles = edge.surface_x.size();
    uint32_t count_x, count_y, count_z;
    Maps::getTileSize(count_x, count_y, count_z);
    if (!count_x || !count_y)
        return false;
    uint16_t max_x = count_x - 1;
    uint16_t max_y = count_y - 1;
    bool found = false;
    for (size_t idx = 0; idx < num_edge_tiles; ++idx) {
        df::coord pos(edge.surface_x[idx], edge.surface_y[idx], edge.surface_z[idx]);
        auto wgroup = Maps::getWalkableGroup(pos);
        if (depot_pathability_groups.contains(wgroup) &&
                (pos.x == 0 || pos.y == 0 || pos.x == max_x || pos.y == max_y)) {
            found = true;
            if (!entry_tiles)
                break;
            entry_tiles->emplace(pos);
        }
    }
    return found;
}

static bool getDepotAccessibleByAnimals(color_ostream &out) {
    unordered_set<df::coord> depot_coords;