MIN_DQ_UV         332 3rdparty/libwebp/enc/quant.c   dq_uv_ac = (enc->uv_alpha_ - MID_ALPHA) * (MAX_DQ_UV - MIN_DQ_UV)
MIN_DQ_UV         337 3rdparty/libwebp/enc/quant.c   dq_uv_ac = clip(dq_uv_ac, MIN_DQ_UV, MAX_DQ_UV);