n2_color2hash
mask = n2_color2hash(mask, szc, 0);
color = n2_color2hash(color, szc, 0);
ncolor = n2_color2hash(ncolor, nszc, 0);
n2_color2hash(ceq_mask, szc, it->mi_mnode_mask);
n2_color2hash(color, szc, it->mi_mnode);
n2_color2hash(ceq_mask, szc, it->mi_mnode_mask));
n2_color2hash(color, szc, it->mi_mnode));