PNG_PASS_START_COL   54 contrib/libtests/pngunknown.c #define PNG_PASS_START_COL(pass) (((1U& (pass))<<(3-(((pass)+1)>>1)))&7)
PNG_PASS_START_COL   83 contrib/libtests/pngvalid.c #define PNG_PASS_START_COL(pass) (((1U& (pass))<<(3-(((pass)+1)>>1)))&7)
PNG_PASS_START_COL 2590 png.h          #define PNG_PASS_START_COL(pass) (((1& (pass))<<(3-(((pass)+1)>>1)))&7)