kGammaTabScale    615 third_party/libwebp/enc/picture.c #define kGammaTabRounder (kGammaTabScale >> 1)
kGammaTabScale    647 third_party/libwebp/enc/picture.c   const int x = v & ((kGammaTabScale << 2) - 1);  // fractional part
kGammaTabScale    650 third_party/libwebp/enc/picture.c   const int y = v1 * x + v0 * ((kGammaTabScale << 2) - x);   // interpolate