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/* GDK - The GIMP Drawing Kit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GTK+ Team and others 1997-2010. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include "gdkframeclockidle.h"
#include "gdk.h"
struct _GdkFrameClockIdlePrivate
{
GTimer *timer;
/* timer_base is used to avoid ever going backward */
guint64 timer_base;
guint64 frame_time;
guint idle_id;
unsigned int in_paint : 1;
};
static void gdk_frame_clock_idle_finalize (GObject *object);
static void gdk_frame_clock_idle_interface_init (GdkFrameClockInterface *iface);
G_DEFINE_TYPE_WITH_CODE (GdkFrameClockIdle, gdk_frame_clock_idle, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (GDK_TYPE_FRAME_CLOCK,
gdk_frame_clock_idle_interface_init))
static void
gdk_frame_clock_idle_class_init (GdkFrameClockIdleClass *klass)
{
GObjectClass *gobject_class = (GObjectClass*) klass;
gobject_class->finalize = gdk_frame_clock_idle_finalize;
g_type_class_add_private (klass, sizeof (GdkFrameClockIdlePrivate));
}
static void
gdk_frame_clock_idle_init (GdkFrameClockIdle *frame_clock_idle)
{
GdkFrameClockIdlePrivate *priv;
frame_clock_idle->priv = G_TYPE_INSTANCE_GET_PRIVATE (frame_clock_idle,
GDK_TYPE_FRAME_CLOCK_IDLE,
GdkFrameClockIdlePrivate);
priv = frame_clock_idle->priv;
priv->timer = g_timer_new ();
}
static void
gdk_frame_clock_idle_finalize (GObject *object)
{
GdkFrameClockIdlePrivate *priv = GDK_FRAME_CLOCK_IDLE (object)->priv;
g_timer_destroy (priv->timer);
G_OBJECT_CLASS (gdk_frame_clock_idle_parent_class)->finalize (object);
}
static guint64
compute_frame_time (GdkFrameClockIdle *idle)
{
GdkFrameClockIdlePrivate *priv = idle->priv;
guint64 computed_frame_time;
guint64 elapsed;
elapsed = ((guint64) (g_timer_elapsed (priv->timer, NULL) * 1000)) + priv->timer_base;
if (elapsed < priv->frame_time)
{
/* clock went backward. adapt to that by forevermore increasing
* timer_base. For now, assume we've gone forward in time 1ms.
*/
/* hmm. just fix GTimer? */
computed_frame_time = priv->frame_time + 1;
priv->timer_base += (priv->frame_time - elapsed) + 1;
}
else
{
computed_frame_time = elapsed;
}
return computed_frame_time;
}
static guint64
gdk_frame_clock_idle_get_frame_time (GdkFrameClock *clock)
{
GdkFrameClockIdlePrivate *priv = GDK_FRAME_CLOCK_IDLE (clock)->priv;
guint64 computed_frame_time;
/* can't change frame time during a paint */
if (priv->in_paint)
return priv->frame_time;
/* Outside a paint, pick something close to "now" */
computed_frame_time = compute_frame_time (GDK_FRAME_CLOCK_IDLE (clock));
/* 16ms is 60fps. We only update frame time that often because we'd
* like to try to keep animations on the same start times.
* get_frame_time() would normally be used outside of a paint to
* record an animation start time for example.
*/
if ((computed_frame_time - priv->frame_time) > 16)
priv->frame_time = computed_frame_time;
return priv->frame_time;
}
static gboolean
gdk_frame_clock_paint_idle (void *data)
{
GdkFrameClock *clock = GDK_FRAME_CLOCK (data);
GdkFrameClockIdle *clock_idle = GDK_FRAME_CLOCK_IDLE (clock);
GdkFrameClockIdlePrivate *priv = clock_idle->priv;
priv->idle_id = 0;
priv->in_paint = TRUE;
priv->frame_time = compute_frame_time (clock_idle);
gdk_frame_clock_paint (clock);
priv->in_paint = FALSE;
return FALSE;
}
static void
gdk_frame_clock_idle_request_frame (GdkFrameClock *clock)
{
GdkFrameClockIdlePrivate *priv = GDK_FRAME_CLOCK_IDLE (clock)->priv;
if (priv->idle_id == 0)
{
priv->idle_id = gdk_threads_add_idle_full (GDK_PRIORITY_REDRAW,
gdk_frame_clock_paint_idle,
g_object_ref (clock),
(GDestroyNotify) g_object_unref);
gdk_frame_clock_frame_requested (clock);
}
}
static gboolean
gdk_frame_clock_idle_get_frame_requested (GdkFrameClock *clock)
{
GdkFrameClockIdlePrivate *priv = GDK_FRAME_CLOCK_IDLE (clock)->priv;
return priv->idle_id != 0;
}
static void
gdk_frame_clock_idle_interface_init (GdkFrameClockInterface *iface)
{
iface->get_frame_time = gdk_frame_clock_idle_get_frame_time;
iface->request_frame = gdk_frame_clock_idle_request_frame;
iface->get_frame_requested = gdk_frame_clock_idle_get_frame_requested;
}
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