frametimings: reuse previous frame timing in common case

Typically, there won't be any references on old frame timings except for
the most recent timing. So instead of discarding these and re-entering
gslice twice, just steal the old frame timing and reuse it.

https://bugzilla.gnome.org/show_bug.cgi?id=765592

1 files changed, 3 insertions, 1 deletions

diff --git a/gdk/gdkframeclockprivate.h b/gdk/gdkframeclockprivate.h
index cda5aff37b..17e06dfcf7 100644
--- a/gdk/gdkframeclockprivate.h
+++ b/gdk/gdkframeclockprivate.h
@@ -111,7 +111,9 @@ void _gdk_frame_clock_begin_frame         (GdkFrameClock   *clock);
 void _gdk_frame_clock_debug_print_timings (GdkFrameClock   *clock,
                                            GdkFrameTimings *timings);
 
-GdkFrameTimings *_gdk_frame_timings_new (gint64 frame_counter);
+GdkFrameTimings *_gdk_frame_timings_new   (gint64           frame_counter);
+gboolean         _gdk_frame_timings_steal (GdkFrameTimings *timings,
+                                           gint64           frame_counter);
 
 void _gdk_frame_clock_emit_flush_events  (GdkFrameClock *frame_clock);
 void _gdk_frame_clock_emit_before_paint  (GdkFrameClock *frame_clock);