read_file        3223 contrib/libtests/pngstest.c    return read_file(image, FORMAT_NO_CHANGE, NULL);
read_file        3296 contrib/libtests/pngstest.c    if (read_file(output, image->image.format | FORMAT_NO_CHANGE, NULL))
read_file        3394 contrib/libtests/pngstest.c          result = read_file(&copy, format, background);