if (min_dist > p->qpos) min_dist = p->qpos;
if (min_dist > CAP_DIST) min_dist = CAP_DIST;
r->anno[1<<2|is_diff<<1|0] += baseQ;
if (min_dist > p->qpos) min_dist = p->qpos;
if (min_dist > CAP_DIST) min_dist = CAP_DIST;
r->anno[1<<2|is_diff<<1|0] += baseQ;