Yrow              814 ext/gd/libgd/webpimg.c     uint8* const Yrow = Y + y * y_stride;
Yrow              817 ext/gd/libgd/webpimg.c       Yrow[x] = ((Yrow[x] * 55 + 32) >> 6) + 16;
Yrow              842 ext/gd/libgd/webpimg.c     uint8* const Yrow = Y + y * y_stride;
Yrow              845 ext/gd/libgd/webpimg.c       const int v = ((Yrow[x] - 16) * 149 + 64) >> 7;
Yrow              846 ext/gd/libgd/webpimg.c       Yrow[x] = (v < 0) ? 0 : (v > 255) ? 255u : v;