Function libass_sys::ass_render_frame

pub unsafe extern "C" fn ass_render_frame(
    priv_: *mut ASS_Renderer, 
    track: *mut ASS_Track, 
    now: c_longlong, 
    detect_change: *mut c_int
) -> *mut ASS_Image

\brief Render a frame, producing a list of ASS_Image. \param priv renderer handle \param track subtitle track \param now video timestamp in milliseconds \param detect_change compare to the previous call and set to 1 if positions changed, or set to 2 if content changed.