static void
on_window_draw (GtkWidget *widget,
cairo_t *cr)
{
GdkRectangle allocation;
double cx, cy, r;
cairo_set_source_rgb (cr, 1., 1., 1.);
cairo_paint (cr);
cairo_set_source_rgb (cr, 0., 0., 0.);
gtk_widget_get_allocation (widget, &allocation);
cx = allocation.width / 2.;
cy = allocation.height / 2.;
r = MIN (allocation.width, allocation.height) / 2.;
cairo_arc (cr, cx, cy, r,
0, 2 * M_PI);
cairo_stroke (cr);
if (displayed_frame)
{
cairo_move_to (cr, cx, cy);
cairo_line_to (cr,
cx + r * cos(displayed_frame->angle - M_PI / 2),
cy + r * sin(displayed_frame->angle - M_PI / 2));
cairo_stroke (cr);
if (displayed_frame->frame_counter == 0)
{
GdkFrameClock *frame_clock = gtk_widget_get_frame_clock (window);
displayed_frame->frame_counter = gdk_frame_clock_get_frame_counter (frame_clock);
}
}
}
static gboolean
gtk_gears_tick (GtkWidget *widget,
GdkFrameClock *frame_clock,
gpointer user_data)
{
GtkGears *gears = GTK_GEARS (widget);
GtkGearsPrivate *priv = gtk_gears_get_instance_private (gears);
GdkFrameTimings *timings, *previous_timings;
gint64 previous_frame_time = 0;
gint64 frame_time;
gint64 history_start, history_len;
gint64 frame;
char *s;
frame = gdk_frame_clock_get_frame_counter (frame_clock);
frame_time = gdk_frame_clock_get_frame_time (frame_clock);
if (priv->first_frame_time == 0)
{
/* No need for changes on first frame */
priv->first_frame_time = frame_time;
if (priv->fps_label)
gtk_label_set_label (priv->fps_label, "FPS: ---");
return G_SOURCE_CONTINUE;
}
/* glxgears advances 70 degrees per second, so do the same */
priv->angle = fmod ((frame_time - priv->first_frame_time) / (double)G_USEC_PER_SEC * 70.0, 360.0);
gtk_widget_queue_draw (widget);
history_start = gdk_frame_clock_get_history_start (frame_clock);
if (priv->fps_label && frame % 60 == 0)
{
history_len = frame - history_start;
if (history_len > 0)
{
previous_timings = gdk_frame_clock_get_timings (frame_clock, frame - history_len);
previous_frame_time = gdk_frame_timings_get_frame_time (previous_timings);
s = g_strdup_printf ("FPS: %-4.1f", (G_USEC_PER_SEC * history_len) / (double)(frame_time - previous_frame_time));
gtk_label_set_label (priv->fps_label, s);
g_free (s);
}
}
timings = gdk_frame_clock_get_current_timings (frame_clock);
previous_timings = gdk_frame_clock_get_timings (frame_clock,
gdk_frame_timings_get_frame_counter (timings) - 1);
if (previous_timings != NULL)
previous_frame_time = gdk_frame_timings_get_frame_time (previous_timings);
return G_SOURCE_CONTINUE;
}
/**
* 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
* candidate presentation time after the given base time.
* 0 will be will be stored if no history is present.
*
* Using the frame history stored in the frame clock, finds the last
* known presentation time and refresh interval, and assuming that
* presentation times are separated by the refresh interval,
* predicts a presentation time that is a multiple of the refresh
* interval after the last presentation time, and later than @base_time.
*
* Since: 3.8
*/
void
gdk_frame_clock_get_refresh_info (GdkFrameClock *frame_clock,
gint64 base_time,
gint64 *refresh_interval_return,
gint64 *presentation_time_return)
{
gint64 frame_counter;
g_return_if_fail (GDK_IS_FRAME_CLOCK (frame_clock));
frame_counter = gdk_frame_clock_get_frame_counter (frame_clock);
if (presentation_time_return)
*presentation_time_return = 0;
if (refresh_interval_return)
*refresh_interval_return = DEFAULT_REFRESH_INTERVAL;
while (TRUE)
{
GdkFrameTimings *timings = gdk_frame_clock_get_timings (frame_clock, frame_counter);
gint64 presentation_time;
gint64 refresh_interval;
if (timings == NULL)
return;
refresh_interval = timings->refresh_interval;
presentation_time = timings->presentation_time;
if (presentation_time != 0)
{
if (presentation_time > base_time - MAX_HISTORY_AGE &&
presentation_time_return)
{
if (refresh_interval == 0)
refresh_interval = DEFAULT_REFRESH_INTERVAL;
if (refresh_interval_return)
*refresh_interval_return = refresh_interval;
while (presentation_time < base_time)
presentation_time += refresh_interval;
if (presentation_time_return)
*presentation_time_return = presentation_time;
}
return;
}
frame_counter--;
}
}
static void
handle_frame_stats (GdkFrameClock *frame_clock)
{
static int num_stats = 0;
static double last_print_time = 0;
static int frames_since_last_print = 0;
static gint64 frame_counter;
static gint64 last_handled_frame = -1;
static Variable latency = VARIABLE_INIT;
double current_time;
current_time = g_get_monotonic_time ();
if (current_time >= last_print_time + 1000000 * statistics_time)
{
if (frames_since_last_print)
{
if (num_stats == 0 && machine_readable)
{
g_print ("# load_factor frame_rate latency\n");
}
num_stats++;
if (machine_readable)
g_print ("%g ", load_factor);
print_double ("Frame rate ",
frames_since_last_print / ((current_time - last_print_time) / 1000000.));
print_variable ("Latency", &latency);
g_print ("\n");
}
last_print_time = current_time;
frames_since_last_print = 0;
variable_reset (&latency);
if (num_stats == max_stats)
gtk_main_quit ();
}
frames_since_last_print++;
for (frame_counter = last_handled_frame;
frame_counter < gdk_frame_clock_get_frame_counter (frame_clock);
frame_counter++)
{
GdkFrameTimings *timings = gdk_frame_clock_get_timings (frame_clock, frame_counter);
GdkFrameTimings *previous_timings = gdk_frame_clock_get_timings (frame_clock, frame_counter - 1);
if (!timings || gdk_frame_timings_get_complete (timings))
last_handled_frame = frame_counter;
if (timings && gdk_frame_timings_get_complete (timings) && previous_timings &&
gdk_frame_timings_get_presentation_time (timings) != 0 &&
gdk_frame_timings_get_presentation_time (previous_timings) != 0)
{
double display_time = (gdk_frame_timings_get_presentation_time (timings) - gdk_frame_timings_get_presentation_time (previous_timings)) / 1000.;
double frame_latency = (gdk_frame_timings_get_presentation_time (previous_timings) - gdk_frame_timings_get_frame_time (previous_timings)) / 1000. + display_time / 2;
variable_add_weighted (&latency, frame_latency, display_time);
}
}
}
