sequential_row   5091 contrib/libtests/pngvalid.c             sequential_row(&d, pp, pi, 0, 1);
sequential_row   6135 contrib/libtests/pngvalid.c          sequential_row(&d.this, pp, pi, -1, 0);
sequential_row   8923 contrib/libtests/pngvalid.c          sequential_row(&d.this, pp, pi, -1, 0);