HIST_C2_BITS      139 jquant2.c      #define HIST_C2_ELEMS  (1<<HIST_C2_BITS)
HIST_C2_BITS      144 jquant2.c      #define C2_SHIFT  (BITS_IN_JSAMPLE-HIST_C2_BITS)
HIST_C2_BITS      626 jquant2.c      #define BOX_C2_LOG  (HIST_C2_BITS-3)