Function t4_t6_encode_set_image_width 

pub unsafe extern "C" fn t4_t6_encode_set_image_width(
    s: *mut t4_t6_encode_state_t,
    image_width: c_int,
) -> c_int

\brief Set the width of the image. \param s The T.4/T.6 context. \param image_width The image width, in pixels. \return 0 for success, otherwise -1.