Pileus Git - ~andy/gtk/blob - perf/timers.c

   1 /* Utility functions for timing widgets
   2  *
   3  * Authors:
   4  *   Federico Mena-Quintero <federico@novell.com>
   5  *
   6  * To measure how long it takes to fully map and expose a toplevel window, we
   7  * use a trick which Owen Taylor described on IRC one day:
   8  *
   9  *   1. Start a timer.
  10  *   2. Call gtk_widget_show_all() on the toplevel window.
  11  *   3. In the expose_event handler of the window, queue an idle handler with
  12  *      G_PRIORITY_HIGH.
  13  *   4. In the idle handler, change a property on the toplevel window.
  14  *   5. In the property_notify_event handler, stop the timer.
  15  */
  16
  17 #include <string.h>
  18 #include <glib.h>
  19 #include <gtk/gtkmain.h>
  20 #include "timers.h"
  21
  22 struct timer_closure
  23 {
  24   GTimer *timer;
  25   GtkWidget *widget;
  26   TimerReportFunc report_func;
  27   gpointer user_data;
  28 };
  29
  30 static gboolean
  31 widget_property_notify_event_cb (GtkWidget *widget, GdkEventProperty *event, gpointer data)
  32 {
  33   struct timer_closure *closure;
  34   gdouble elapsed;
  35
  36   closure = data;
  37
  38   if (event->atom != gdk_atom_intern ("window_property_change", FALSE))
  39     return FALSE;
  40
  41   /* Finish timing map/expose */
  42
  43   elapsed = g_timer_elapsed (closure->timer, NULL);
  44   (* closure->report_func) (TIMER_REPORT_WIDGET_SHOW, elapsed, closure->user_data);
  45
  46   /* Time destruction */
  47
  48   g_timer_reset (closure->timer);
  49   gtk_widget_destroy (widget);
  50   elapsed = g_timer_elapsed (closure->timer, NULL);
  51   (* closure->report_func) (TIMER_REPORT_WIDGET_DESTRUCTION, elapsed, closure->user_data);
  52
  53   gtk_main_quit (); /* This will get us back to the end of timer_time_widget() */
  54   return TRUE;
  55 }
  56
  57 static gboolean
  58 idle_after_expose_cb (gpointer data)
  59 {
  60   struct timer_closure *closure;
  61
  62   closure = data;
  63
  64   gdk_property_change (closure->widget->window,
  65                        gdk_atom_intern ("window_property_change", FALSE),
  66                        gdk_atom_intern ("STRING", FALSE),
  67                        8,
  68                        GDK_PROP_MODE_REPLACE,
  69                        "hello",
  70                        strlen ("hello"));
  71
  72   return FALSE;
  73 }
  74
  75 static gboolean
  76 widget_expose_event_cb (GtkWidget *widget, GdkEventExpose *event, gpointer data)
  77 {
  78   struct timer_closure *closure;
  79
  80   closure = data;
  81
  82   g_idle_add_full (G_PRIORITY_HIGH, idle_after_expose_cb, closure, NULL);
  83   return FALSE;
  84 }
  85
  86 static void
  87 instrument_widget (GtkWidget *widget,
  88                    struct timer_closure *closure)
  89 {
  90   g_signal_connect (widget, "expose-event",
  91                     G_CALLBACK (widget_expose_event_cb), closure);
  92
  93   gtk_widget_add_events (widget, GDK_PROPERTY_CHANGE_MASK);
  94   g_signal_connect (widget, "property-notify-event",
  95                     G_CALLBACK (widget_property_notify_event_cb), closure);
  96 }
  97
  98 void
  99 timer_time_widget (TimerWidgetCreateFunc create_func,
 100                    TimerReportFunc       report_func,
 101                    gpointer              user_data)
 102 {
 103   GTimer *timer;
 104   GtkWidget *widget;
 105   gdouble elapsed;
 106   struct timer_closure closure;
 107
 108   g_assert (create_func != NULL);
 109   g_assert (report_func != NULL);
 110
 111   /* Time creation */
 112
 113   timer = g_timer_new ();
 114   widget = (* create_func) (user_data);
 115   g_assert (widget != NULL);
 116   g_assert (!GTK_WIDGET_VISIBLE (widget) && !GTK_WIDGET_MAPPED (widget));
 117   elapsed = g_timer_elapsed (timer, NULL);
 118
 119   (* report_func) (TIMER_REPORT_WIDGET_CREATION, elapsed, user_data);
 120
 121   /* Start timing map/expose */
 122
 123   closure.timer = timer;
 124   closure.widget = widget;
 125   closure.report_func = report_func;
 126   closure.user_data = user_data;
 127   instrument_widget (widget, &closure);
 128
 129   g_timer_reset (timer);
 130   gtk_widget_show_all (widget);
 131   gtk_main ();
 132
 133   /* Expose time and destruction time get recorded in widget_property_notify_event_cb() */
 134 }