HIST_C2_BITS      250 ext/gd/libgd/gd_topal.c #define HIST_C2_ELEMS  (1<<HIST_C2_BITS)
HIST_C2_BITS      255 ext/gd/libgd/gd_topal.c #define C2_SHIFT  (BITS_IN_JSAMPLE-HIST_C2_BITS)
HIST_C2_BITS      903 ext/gd/libgd/gd_topal.c #define BOX_C2_LOG  (HIST_C2_BITS-3)