PNG_NO_FILTERS   1107 pngwrite.c              if (png_ptr->do_filter == PNG_NO_FILTERS)
PNG_NO_FILTERS   2270 pngwrite.c           png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, PNG_NO_FILTERS);
PNG_NO_FILTERS    905 pngwutil.c        if ((png_ptr->do_filter) == PNG_NO_FILTERS)