PNG_FP_NEGATIVE 1334 3rdparty/libpng/png.c case 45: type = PNG_FP_SAW_SIGN + PNG_FP_NEGATIVE; break; PNG_FP_NEGATIVE 1577 3rdparty/libpng/pngpriv.h #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)