PNG_CRC_WARN_DISCARD   49 3rdparty/libpng/pngrtran.c       case PNG_CRC_WARN_DISCARD:    /* Not a valid action for critical data */
PNG_CRC_WARN_DISCARD   82 3rdparty/libpng/pngrtran.c       case PNG_CRC_WARN_DISCARD:                      /* Warn/discard data */