Function pixman_image_create_linear_gradient 

pub unsafe extern "C" fn pixman_image_create_linear_gradient(
    p1: *const pixman_point_fixed_t,
    p2: *const pixman_point_fixed_t,
    stops: *const pixman_gradient_stop_t,
    n_stops: c_int,
) -> *mut pixman_image_t