[gtk/matthiasc/for-master: 12/16] Add gdk_frame_clock_get_fps

[Matthias Clasen <matthiasc src gnome org>]

commit b1669996833320eb7402415b15cd4a19d2310c25
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Sep 13 23:31:17 2020 -0400

    Add gdk_frame_clock_get_fps
    
    We already have more than one copy of this code
    in GTK, so just export this function.

 docs/reference/gdk/gdk4-sections.txt |  1 +
 gdk/gdkframeclock.c                  | 17 ++++++++++++-----
 gdk/gdkframeclock.h                  |  3 +++
 3 files changed, 16 insertions(+), 5 deletions(-)
---
diff --git a/docs/reference/gdk/gdk4-sections.txt b/docs/reference/gdk/gdk4-sections.txt
index c601c44407..68343f9923 100644
--- a/docs/reference/gdk/gdk4-sections.txt
+++ b/docs/reference/gdk/gdk4-sections.txt
@@ -1036,6 +1036,7 @@ gdk_frame_clock_get_history_start
 gdk_frame_clock_get_timings
 gdk_frame_clock_get_current_timings
 gdk_frame_clock_get_refresh_info
+gdk_frame_clock_get_fps
 
 <SUBSECTION Private>
 GDK_FRAME_CLOCK
diff --git a/gdk/gdkframeclock.c b/gdk/gdkframeclock.c
index 9ecb8707fb..4d05da780c 100644
--- a/gdk/gdkframeclock.c
+++ b/gdk/gdkframeclock.c
@@ -718,7 +718,6 @@ _gdk_frame_clock_emit_resume_events (GdkFrameClock *frame_clock)
   g_signal_emit (frame_clock, signals[RESUME_EVENTS], 0);
 }
 
-#ifdef HAVE_SYSPROF
 static gint64
 guess_refresh_interval (GdkFrameClock *frame_clock)
 {
@@ -753,8 +752,17 @@ guess_refresh_interval (GdkFrameClock *frame_clock)
   return interval;
 }
 
-static double
-frame_clock_get_fps (GdkFrameClock *frame_clock)
+/**
+ * gdk_frame_clock_get_fps:
+ * @frame_clock: a #GdkFrameClock
+ *
+ * Calculates the current frames-per-second, based on the
+ * frame timings of @frame_clock.
+ *
+ * Returns: the current fps, as a double
+ */
+double
+gdk_frame_clock_get_fps (GdkFrameClock *frame_clock)
 {
   GdkFrameTimings *start, *end;
   gint64 start_counter, end_counter;
@@ -788,7 +796,6 @@ frame_clock_get_fps (GdkFrameClock *frame_clock)
 
   return ((double) end_counter - start_counter) * G_USEC_PER_SEC / (end_timestamp - start_timestamp);
 }
-#endif
 
 void
 _gdk_frame_clock_add_timings_to_profiler (GdkFrameClock   *clock,
@@ -804,5 +811,5 @@ _gdk_frame_clock_add_timings_to_profiler (GdkFrameClock   *clock,
       gdk_profiler_add_mark (1000 * timings->presentation_time, 0, "presented window", NULL);
     }
 
-  gdk_profiler_set_counter (fps_counter, frame_clock_get_fps (clock));
+  gdk_profiler_set_counter (fps_counter, gdk_frame_clock_get_fps (clock));
 }
diff --git a/gdk/gdkframeclock.h b/gdk/gdkframeclock.h
index 962bf0c189..a2eba246ad 100644
--- a/gdk/gdkframeclock.h
+++ b/gdk/gdkframeclock.h
@@ -103,6 +103,9 @@ void gdk_frame_clock_get_refresh_info (GdkFrameClock *frame_clock,
                                        gint64        *refresh_interval_return,
                                        gint64        *presentation_time_return);
 
+GDK_AVAILABLE_IN_ALL
+double gdk_frame_clock_get_fps (GdkFrameClock *frame_clock);
+
 G_END_DECLS
 
 #endif /* __GDK_FRAME_CLOCK_H__ */