Function graphene_sys::graphene_matrix_to_2d

pub unsafe extern "C" fn graphene_matrix_to_2d(
    m: *const graphene_matrix_t, 
    xx: *mut c_double, 
    yx: *mut c_double, 
    xy: *mut c_double, 
    yy: *mut c_double, 
    x_0: *mut c_double, 
    y_0: *mut c_double
) -> gboolean