Function text_add_in 

pub unsafe extern "C" fn text_add_in(
    text_utf8: *const c_char,
    transform: *const Matrix,
    size: Vec2,
    fit: TextFit,
    style: TextStyle,
    position: Pivot,
    align: Align,
    off_x: f32,
    off_y: f32,
    off_z: f32,
    vertex_tint_linear: Color128,
) -> f32