Function cogl_matrix_transform_points 

pub unsafe extern "C" fn cogl_matrix_transform_points(
    matrix: *const CoglMatrix,
    n_components: c_int,
    stride_in: size_t,
    points_in: *mut c_void,
    stride_out: size_t,
    points_out: *mut c_void,
    n_points: c_int,
)