fract            1197 libavfilter/vf_xfade.c             const float ss = smooth <= fract(10.f * x / w) ? 0.f : 1.f;              \
fract            1227 libavfilter/vf_xfade.c             const float ss = smooth <= fract(10.f * xx) ? 0.f : 1.f;                 \
fract            1255 libavfilter/vf_xfade.c          const float ss = smooth <= fract(10.f * y / h) ? 0.f : 1.f;                 \
fract            1285 libavfilter/vf_xfade.c          const float ss = smooth <= fract(10.f * yy) ? 0.f : 1.f;                    \