PredictionCostSpatial  515 3rdparty/libwebp/dsp/lossless.c     retval += PredictionCostSpatial(tile[i], 1, kExpValue);
PredictionCostSpatial  870 3rdparty/libwebp/dsp/lossless.c          PredictionCostSpatial(counts, 3, kExpValue);