Add proper annotation for gdk_frame_clock_get_refresh_info

See https://gitlab.gnome.org/GNOME/gtk/issues/77

diff --git a/gdk/gdkframeclock.c b/gdk/gdkframeclock.c
index a1f20c40e94b6270789e5c146967339238b3883d..e848a21d5a3e18612ca36c8d0b5c148e31229a53 100644 (file)
--- a/gdk/gdkframeclock.c
+++ b/gdk/gdkframeclock.c
@@ -537,10 +537,10 @@ _gdk_frame_clock_debug_print_timings (GdkFrameClock   *clock,
  * gdk_frame_clock_get_refresh_info:
  * @frame_clock: a #GdkFrameClock
  * @base_time: base time for determining a presentaton time
- * @refresh_interval_return: a location to store the determined refresh
- *  interval, or %NULL. A default refresh interval of 1/60th of
- *  a second will be stored if no history is present.
- * @presentation_time_return: a location to store the next
+ * @refresh_interval_return: (out) (optional): a location to store the
+ * determined refresh interval, or %NULL. A default refresh interval of
+ * 1/60th of a second will be stored if no history is present.
+ * @presentation_time_return: (out): a location to store the next
  *  candidate presentation time after the given base time.
  *  0 will be will be stored if no history is present.
  *