QuantizeLevels    224 3rdparty/libwebp/enc/alpha.c     ok = QuantizeLevels(quant_alpha, width, height, alpha_levels, &sse);
QuantizeLevels     29 3rdparty/libwebp/utils/quant_levels.h int QuantizeLevels(uint8_t* const data, int width, int height, int num_levels,