BOX_C2_LOG        630 jquant2.c      #define BOX_C2_ELEMS  (1<<BOX_C2_LOG)
BOX_C2_LOG        634 jquant2.c      #define BOX_C2_SHIFT  (C2_SHIFT + BOX_C2_LOG)
BOX_C2_LOG        875 jquant2.c        c2 >>= BOX_C2_LOG;
BOX_C2_LOG        897 jquant2.c        c2 <<= BOX_C2_LOG;