Function register_birthday

plugins/timestream.cpp:137–149

static const int32_t TICKS_PER_YEAR = 403200;

static void register_birthday(df::unit * unit) {
    int32_t btick = unit->birth_time;
    if (btick < 0 || btick > TICKS_PER_YEAR)
        return;
    if (birthday_triggers.size() <= (size_t)btick)
        birthday_triggers.resize(btick+1, INT32_MAX);
    for (int32_t tick=btick; tick >= 0; --tick) {
        if (birthday_triggers[tick] > btick)
            birthday_triggers[tick] = btick;
        else
            break;
    }
}

static void refresh_birthday_triggers() {
    birthday_triggers.clear();