PNG_FLAG_KEEP_UNKNOWN_CHUNKS 2668 3rdparty/libpng/pngrutil.c    if ((png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
PNG_FLAG_KEEP_UNKNOWN_CHUNKS 1131 3rdparty/libpng/pngset.c          png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
PNG_FLAG_KEEP_UNKNOWN_CHUNKS 1134 3rdparty/libpng/pngset.c          png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;