DEFAULT_ALPHA     241 3rdparty/libwebp/enc/analysis.c   int best_alpha = DEFAULT_ALPHA;
DEFAULT_ALPHA     275 3rdparty/libwebp/enc/analysis.c     int best_mode_alpha = DEFAULT_ALPHA;
DEFAULT_ALPHA     307 3rdparty/libwebp/enc/analysis.c   int best_alpha = DEFAULT_ALPHA;