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fishbowl: Make stats tracking work somewhat with broken X servers

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Broken X servers being the ones that don't support NET_WM_TIMINGS (ie
every WM but mutter and XWayland).
This commit is contained in:
Benjamin Otte 2018-03-30 18:25:48 +02:00
parent 89f6a4ede4
commit 2f3cf6227a
1 changed files with 41 additions and 1 deletions
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42
demos/gtk-demo/fishbowl.c
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@ -40,6 +40,40 @@ get_stats (GtkWidget *widget)
return stats;
}
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 void
do_stats (GtkWidget *widget,
gint *suggested_change)
@ -65,7 +99,7 @@ do_stats (GtkWidget *widget,
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 (start_counter == end_counter)
if (end_counter - start_counter < 4)
return;
start_timestamp = gdk_frame_timings_get_presentation_time (start);
@ -77,6 +111,12 @@ do_stats (GtkWidget *widget,
}
interval = gdk_frame_timings_get_refresh_interval (end);
if (interval == 0)
{
interval = guess_refresh_interval (frame_clock);
if (interval == 0)
return;
}
n_frames = end_counter - start_counter;
expected_frames = round ((double) (end_timestamp - start_timestamp) / interval);