WEBP_FILTER_FAST  200 3rdparty/libwebp/enc/alpha.c   assert(filter >= WEBP_FILTER_NONE && filter <= WEBP_FILTER_FAST);
WEBP_FILTER_FAST  233 3rdparty/libwebp/enc/alpha.c     if (filter == WEBP_FILTER_FAST) {  // Quick estimate of the best candidate.
WEBP_FILTER_FAST  337 3rdparty/libwebp/enc/alpha.c       (config->alpha_filtering == 1) ? WEBP_FILTER_FAST :