PNG_FILTER_SUB   1470 contrib/libtests/makepng.c             filters = PNG_FILTER_SUB | PNG_FILTER_PAETH;
PNG_FILTER_SUB   1600 png.h          #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
PNG_FILTER_SUB   1018 pngwrite.c                 png_ptr->do_filter = PNG_FILTER_SUB; break;
PNG_FILTER_SUB   1049 pngwrite.c              if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
PNG_FILTER_SUB   1981 pngwutil.c        if (png_ptr->do_filter & PNG_FILTER_SUB)
PNG_FILTER_SUB   2441 pngwutil.c        if (filter_to_do == PNG_FILTER_SUB)
PNG_FILTER_SUB   2462 pngwutil.c        else if (filter_to_do & PNG_FILTER_SUB)