PNG_FILTER_AVG   1467 contrib/libtests/makepng.c             filters &= ~(PNG_FILTER_NONE | PNG_FILTER_AVG);
PNG_FILTER_AVG   1601 png.h                                   PNG_FILTER_AVG | PNG_FILTER_PAETH)
PNG_FILTER_AVG   1024 pngwrite.c                 png_ptr->do_filter = PNG_FILTER_AVG; break;
PNG_FILTER_AVG   1073 pngwrite.c              if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)
PNG_FILTER_AVG   1079 pngwrite.c                        ~PNG_FILTER_AVG);
PNG_FILTER_AVG   1989 pngwutil.c        if (png_ptr->do_filter & (PNG_FILTER_AVG | PNG_FILTER_UP | PNG_FILTER_PAETH))
PNG_FILTER_AVG   2002 pngwutil.c           if (png_ptr->do_filter & PNG_FILTER_AVG)
PNG_FILTER_AVG   2678 pngwutil.c        if (filter_to_do == PNG_FILTER_AVG)
PNG_FILTER_AVG   2697 pngwutil.c        else if (filter_to_do & PNG_FILTER_AVG)