PNG_INFO_sPLT     502 third_party/libpng/png.c          info_ptr->valid &= ~PNG_INFO_sPLT;
PNG_INFO_sPLT     956 third_party/libpng/pngset.c    info_ptr->valid |= PNG_INFO_sPLT;
PNG_INFO_sPLT     224 third_party/libpng/pngwrite.c    if (info_ptr->valid & PNG_INFO_sPLT)