[gtk/matthiasc/for-master: 14/16] gtk-demo: Use gdk_frame_clock_get_fps

[Matthias Clasen <matthiasc src gnome org>]

commit c66a8cb941c58b6aaa1ef8f6d5e6f23e65b86578
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Sep 13 23:42:13 2020 -0400

    gtk-demo: Use gdk_frame_clock_get_fps
    
    Remove another copy of this code in the theme
    switching benchmark.

 demos/gtk-demo/themes.c  | 72 +-----------------------------------------------
 demos/gtk-demo/themes.ui |  6 +++-
 2 files changed, 6 insertions(+), 72 deletions(-)
---
diff --git a/demos/gtk-demo/themes.c b/demos/gtk-demo/themes.c
index 1275117975..6620c7552f 100644
--- a/demos/gtk-demo/themes.c
+++ b/demos/gtk-demo/themes.c
@@ -10,76 +10,6 @@
 
 static guint tick_cb;
 
-static gint64
-guess_refresh_interval (GdkFrameClock *frame_clock)
-{
-  gint64 interval;
-  gint64 i;
-
-  interval = G_MAXINT64;
-
-  for (i = gdk_frame_clock_get_history_start (frame_clock);
-       i < gdk_frame_clock_get_frame_counter (frame_clock);
-       i++)
-    {
-      GdkFrameTimings *t, *before;
-      gint64 ts, before_ts;
-
-      t = gdk_frame_clock_get_timings (frame_clock, i);
-      before = gdk_frame_clock_get_timings (frame_clock, i - 1);
-      if (t == NULL || before == NULL)
-        continue;
-
-      ts = gdk_frame_timings_get_frame_time (t);
-      before_ts = gdk_frame_timings_get_frame_time (before);
-      if (ts == 0 || before_ts == 0)
-        continue;
-
-      interval = MIN (interval, ts - before_ts);
-    }
-
-  if (interval == G_MAXINT64)
-    return 0;
-
-  return interval;
-}
-
-static double
-frame_clock_get_fps (GdkFrameClock *frame_clock)
-{
-  GdkFrameTimings *start, *end;
-  gint64 start_counter, end_counter;
-  gint64 start_timestamp, end_timestamp;
-  gint64 interval;
-
-  start_counter = gdk_frame_clock_get_history_start (frame_clock);
-  end_counter = gdk_frame_clock_get_frame_counter (frame_clock);
-  start = gdk_frame_clock_get_timings (frame_clock, start_counter);
-  for (end = gdk_frame_clock_get_timings (frame_clock, end_counter);
-       end_counter > start_counter && end != NULL && !gdk_frame_timings_get_complete (end);
-       end = gdk_frame_clock_get_timings (frame_clock, end_counter))
-    end_counter--;
-  if (end_counter - start_counter < 4)
-    return 0.0;
-
-  start_timestamp = gdk_frame_timings_get_presentation_time (start);
-  end_timestamp = gdk_frame_timings_get_presentation_time (end);
-  if (start_timestamp == 0 || end_timestamp == 0)
-    {
-      start_timestamp = gdk_frame_timings_get_frame_time (start);
-      end_timestamp = gdk_frame_timings_get_frame_time (end);
-    }
-  interval = gdk_frame_timings_get_refresh_interval (end);
-  if (interval == 0)
-    {
-      interval = guess_refresh_interval (frame_clock);
-      if (interval == 0)
-        return 0.0;
-    }
-
-  return ((double) end_counter - start_counter) * G_USEC_PER_SEC / (end_timestamp - start_timestamp);
-}
-
 typedef struct {
   const char *name;
   gboolean dark;
@@ -116,7 +46,7 @@ change_theme (GtkWidget     *widget,
     {
       char *fps;
 
-      fps = g_strdup_printf ("%.2f fps", frame_clock_get_fps (frame_clock));
+      fps = g_strdup_printf ("%.2f fps", gdk_frame_clock_get_fps (frame_clock));
       gtk_label_set_label (GTK_LABEL (label), fps);
       g_free (fps);
     }
diff --git a/demos/gtk-demo/themes.ui b/demos/gtk-demo/themes.ui
index f40d9a46a1..c3f6ddbe79 100644
--- a/demos/gtk-demo/themes.ui
+++ b/demos/gtk-demo/themes.ui
@@ -19,7 +19,11 @@
           </object>
         </child>
         <child type="end">
-          <object class="GtkLabel" id="fps"/>
+          <object class="GtkLabel" id="fps">
+            <attributes>
+              <attribute name="font-features" value="tnum=1"/>
+            </attributes>
+          </object>
         </child>
       </object>
     </child>