WEBP_FILTER_HORIZONTAL  279 3rdparty/libwebp/enc/alpha.c            try_filter_none ? WEBP_FILTER_HORIZONTAL : WEBP_FILTER_NONE;
WEBP_FILTER_HORIZONTAL  182 3rdparty/libwebp/utils/filters.c       bins[WEBP_FILTER_HORIZONTAL][diff1] = 1;