DITHER_DESCALE    186 third_party/libwebp/dec/frame.c #define DITHER_DESCALE_ROUNDER (1 << (DITHER_DESCALE - 1))
DITHER_DESCALE    198 third_party/libwebp/dec/frame.c       const int delta = (bits + DITHER_DESCALE_ROUNDER) >> DITHER_DESCALE;