VP8GetCostLuma16  791 3rdparty/libwebp/enc/quant.c     rd16.R = VP8GetCostLuma16(it, &rd16);
VP8GetCostLuma16  489 3rdparty/libwebp/enc/vp8enci.h int VP8GetCostLuma16(VP8EncIterator* const it, const VP8ModeScore* const rd);