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/* Utility functions for timing widgets
*
* Authors:
* Federico Mena-Quintero <federico@novell.com>
*
* To measure how long it takes to fully map and expose a toplevel window, we
* use a trick which Owen Taylor described on IRC one day:
*
* 1. Start a timer.
* 2. Call gtk_widget_show_all() on the toplevel window.
* 3. In the expose_event handler of the window, queue an idle handler with
* G_PRIORITY_HIGH.
* 4. In the idle handler, change a property on the toplevel window.
* 5. In the property_notify_event handler, stop the timer.
*/
#include <string.h>
#include <glib.h>
#include <gtk/gtkmain.h>
#include "timers.h"
struct timer_closure
{
GTimer *timer;
GtkWidget *widget;
TimerReportFunc report_func;
gpointer user_data;
};
static gboolean
widget_property_notify_event_cb (GtkWidget *widget, GdkEventProperty *event, gpointer data)
{
struct timer_closure *closure;
gdouble elapsed;
closure = data;
if (event->atom != gdk_atom_intern ("window_property_change", FALSE))
return FALSE;
/* Finish timing map/expose */
elapsed = g_timer_elapsed (closure->timer, NULL);
(* closure->report_func) (TIMER_REPORT_WIDGET_SHOW, elapsed, closure->user_data);
/* Time destruction */
g_timer_reset (closure->timer);
gtk_widget_destroy (widget);
elapsed = g_timer_elapsed (closure->timer, NULL);
(* closure->report_func) (TIMER_REPORT_WIDGET_DESTRUCTION, elapsed, closure->user_data);
gtk_main_quit (); /* This will get us back to the end of timer_time_widget() */
return TRUE;
}
static gboolean
idle_after_expose_cb (gpointer data)
{
struct timer_closure *closure;
closure = data;
gdk_property_change (closure->widget->window,
gdk_atom_intern ("window_property_change", FALSE),
gdk_atom_intern ("STRING", FALSE),
8,
GDK_PROP_MODE_REPLACE,
"hello",
strlen ("hello"));
return FALSE;
}
static gboolean
widget_expose_event_cb (GtkWidget *widget, GdkEventExpose *event, gpointer data)
{
struct timer_closure *closure;
closure = data;
g_idle_add_full (G_PRIORITY_HIGH, idle_after_expose_cb, closure, NULL);
return FALSE;
}
static void
instrument_widget (GtkWidget *widget,
struct timer_closure *closure)
{
g_signal_connect (widget, "expose-event",
G_CALLBACK (widget_expose_event_cb), closure);
gtk_widget_add_events (widget, GDK_PROPERTY_CHANGE_MASK);
g_signal_connect (widget, "property-notify-event",
G_CALLBACK (widget_property_notify_event_cb), closure);
}
void
timer_time_widget (TimerWidgetCreateFunc create_func,
TimerReportFunc report_func,
gpointer user_data)
{
GTimer *timer;
GtkWidget *widget;
gdouble elapsed;
struct timer_closure closure;
g_assert (create_func != NULL);
g_assert (report_func != NULL);
/* Time creation */
timer = g_timer_new ();
widget = (* create_func) (user_data);
g_assert (widget != NULL);
g_assert (!GTK_WIDGET_VISIBLE (widget) && !GTK_WIDGET_MAPPED (widget));
elapsed = g_timer_elapsed (timer, NULL);
(* report_func) (TIMER_REPORT_WIDGET_CREATION, elapsed, user_data);
/* Start timing map/expose */
closure.timer = timer;
closure.widget = widget;
closure.report_func = report_func;
closure.user_data = user_data;
instrument_widget (widget, &closure);
g_timer_reset (timer);
gtk_widget_show_all (widget);
gtk_main ();
/* Expose time and destruction time get recorded in widget_property_notify_event_cb() */
}
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