PNG_PASS_MASK      69 contrib/libtests/pngunknown.c    ((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1)
PNG_PASS_MASK      71 contrib/libtests/pngunknown.c    ((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1)
PNG_PASS_MASK      98 contrib/libtests/pngvalid.c    ((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1)
PNG_PASS_MASK     100 contrib/libtests/pngvalid.c    ((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1)
PNG_PASS_MASK    2637 png.h             ((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1)
PNG_PASS_MASK    2639 png.h             ((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1)