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15ee04c66f
gtk/gdk/gdkframeclockidle.c
Owen W. Taylor 15ee04c66f Add GdkFrameHistory and GdkFrameTimings, handle _NET_WM_FRAME_TIMINGS 
In order to be able to track statistics about how well we are drawing,
and in order to be able to do sophisticated things with frame timing
like predicting per-frame latencies and synchronizing audio with video,
we need to be able to track exactly when previous frames were drawn
to the screen.

Information about each frame is stored in a new GdkFrameTimings object.
A new GdkFrameHistory object is added which keeps a queue of recent
GdkFrameTimings (this is added to avoid further complicating the
implementation of GdkFrameClock.)

https://bugzilla.gnome.org/show_bug.cgi?id=685460
2013-02-14 17:19:50 -05:00

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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"
#define FRAME_INTERVAL 16667 // microseconds
struct _GdkFrameClockIdlePrivate
{
GdkFrameHistory *history;
GTimer *timer;
/* timer_base is used to avoid ever going backward */
guint64 timer_base;
guint64 frame_time;
guint64 min_next_frame_time;
guint flush_idle_id;
guint paint_idle_id;
guint freeze_count;
GdkFrameClockPhase requested;
GdkFrameClockPhase phase;
};
static gboolean gdk_frame_clock_flush_idle (void *data);
static gboolean gdk_frame_clock_paint_idle (void *data);
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->history = gdk_frame_history_new ();
priv->timer = g_timer_new ();
priv->freeze_count = 0;
}
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 = g_get_monotonic_time () + 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->phase != GDK_FRAME_CLOCK_PHASE_NONE &&
priv->phase != GDK_FRAME_CLOCK_PHASE_FLUSH_EVENTS)
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) > FRAME_INTERVAL)
priv->frame_time = computed_frame_time;
return priv->frame_time;
}
static void
maybe_start_idle (GdkFrameClockIdle *clock_idle)
{
GdkFrameClockIdlePrivate *priv = clock_idle->priv;
if (priv->freeze_count == 0)
{
guint min_interval = 0;
if (priv->min_next_frame_time != 0)
{
guint64 now = compute_frame_time (clock_idle);
guint64 min_interval_us = MAX (priv->min_next_frame_time, now) - now;
min_interval = (min_interval_us + 500) / 1000;
}
if (priv->flush_idle_id == 0 &&
(priv->requested & GDK_FRAME_CLOCK_PHASE_FLUSH_EVENTS) != 0)
{
priv->flush_idle_id = gdk_threads_add_timeout_full (GDK_PRIORITY_EVENTS + 1,
min_interval,
gdk_frame_clock_flush_idle,
g_object_ref (clock_idle),
(GDestroyNotify) g_object_unref);
}
if (priv->paint_idle_id == 0 &&
(priv->requested & ~GDK_FRAME_CLOCK_PHASE_FLUSH_EVENTS) != 0)
{
priv->paint_idle_id = gdk_threads_add_timeout_full (GDK_PRIORITY_REDRAW,
min_interval,
gdk_frame_clock_paint_idle,
g_object_ref (clock_idle),
(GDestroyNotify) g_object_unref);
gdk_frame_clock_frame_requested (GDK_FRAME_CLOCK (clock_idle));
}
}
}
static gboolean
gdk_frame_clock_flush_idle (void *data)
{
GdkFrameClock *clock = GDK_FRAME_CLOCK (data);
GdkFrameClockIdle *clock_idle = GDK_FRAME_CLOCK_IDLE (clock);
GdkFrameClockIdlePrivate *priv = clock_idle->priv;
priv->flush_idle_id = 0;
if (priv->phase != GDK_FRAME_CLOCK_PHASE_NONE)
return FALSE;
priv->phase = GDK_FRAME_CLOCK_PHASE_FLUSH_EVENTS;
priv->requested &= ~GDK_FRAME_CLOCK_PHASE_FLUSH_EVENTS;
g_signal_emit_by_name (G_OBJECT (clock), "flush-events");
if ((priv->requested & ~GDK_FRAME_CLOCK_PHASE_FLUSH_EVENTS) != 0)
priv->phase = GDK_FRAME_CLOCK_PHASE_BEFORE_PAINT;
else
priv->phase = GDK_FRAME_CLOCK_PHASE_NONE;
return FALSE;
}
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;
gboolean skip_to_resume_events;
priv->paint_idle_id = 0;
skip_to_resume_events =
(priv->requested & ~(GDK_FRAME_CLOCK_PHASE_FLUSH_EVENTS | GDK_FRAME_CLOCK_PHASE_RESUME_EVENTS)) == 0;
if (!skip_to_resume_events)
{
switch (priv->phase)
{
case GDK_FRAME_CLOCK_PHASE_FLUSH_EVENTS:
break;
case GDK_FRAME_CLOCK_PHASE_NONE:
case GDK_FRAME_CLOCK_PHASE_BEFORE_PAINT:
if (priv->freeze_count == 0)
{
GdkFrameTimings *timings;
gint64 frame_counter;
priv->frame_time = compute_frame_time (clock_idle);
gdk_frame_history_begin_frame (priv->history);
frame_counter = gdk_frame_history_get_frame_counter (priv->history);
timings = gdk_frame_history_get_timings (priv->history, frame_counter);
gdk_frame_timings_set_frame_time (timings, priv->frame_time);
priv->phase = GDK_FRAME_CLOCK_PHASE_BEFORE_PAINT;
/* We always emit ::before-paint and ::after-paint if
* any of the intermediate phases are requested and
* they don't get repeated if you freeze/thaw while
* in them. */
priv->requested &= ~GDK_FRAME_CLOCK_PHASE_BEFORE_PAINT;
g_signal_emit_by_name (G_OBJECT (clock), "before-paint");
priv->phase = GDK_FRAME_CLOCK_PHASE_UPDATE;
}
case GDK_FRAME_CLOCK_PHASE_UPDATE:
if (priv->freeze_count == 0)
{
if (priv->requested & GDK_FRAME_CLOCK_PHASE_UPDATE)
{
priv->requested &= ~GDK_FRAME_CLOCK_PHASE_UPDATE;
g_signal_emit_by_name (G_OBJECT (clock), "update");
}
}
case GDK_FRAME_CLOCK_PHASE_LAYOUT:
if (priv->freeze_count == 0)
{
priv->phase = GDK_FRAME_CLOCK_PHASE_LAYOUT;
if (priv->requested & GDK_FRAME_CLOCK_PHASE_LAYOUT)
{
priv->requested &= ~GDK_FRAME_CLOCK_PHASE_LAYOUT;
g_signal_emit_by_name (G_OBJECT (clock), "layout");
}
}
case GDK_FRAME_CLOCK_PHASE_PAINT:
if (priv->freeze_count == 0)
{
priv->phase = GDK_FRAME_CLOCK_PHASE_PAINT;
if (priv->requested & GDK_FRAME_CLOCK_PHASE_PAINT)
{
priv->requested &= ~GDK_FRAME_CLOCK_PHASE_PAINT;
g_signal_emit_by_name (G_OBJECT (clock), "paint");
}
}
case GDK_FRAME_CLOCK_PHASE_AFTER_PAINT:
if (priv->freeze_count == 0)
{
priv->requested &= ~GDK_FRAME_CLOCK_PHASE_AFTER_PAINT;
g_signal_emit_by_name (G_OBJECT (clock), "after-paint");
/* the ::after-paint phase doesn't get repeated on freeze/thaw,
*/
priv->phase = GDK_FRAME_CLOCK_PHASE_NONE;
}
case GDK_FRAME_CLOCK_PHASE_RESUME_EVENTS:
;
}
}
if (priv->requested & GDK_FRAME_CLOCK_PHASE_RESUME_EVENTS)
{
priv->requested &= ~GDK_FRAME_CLOCK_PHASE_RESUME_EVENTS;
g_signal_emit_by_name (G_OBJECT (clock), "resume-events");
}
priv->phase = GDK_FRAME_CLOCK_PHASE_NONE;
if (priv->freeze_count == 0 && priv->requested != 0)
{
/* We need to start over again immediately - this implies that there is no
* throttling at the backend layer, so we need to back-off ourselves.
*/
gdk_flush ();
priv->min_next_frame_time = priv->frame_time + FRAME_INTERVAL;
maybe_start_idle (clock_idle);
}
else
{
priv->min_next_frame_time = 0;
}
return FALSE;
}
static void
gdk_frame_clock_idle_request_phase (GdkFrameClock *clock,
GdkFrameClockPhase phase)
{
GdkFrameClockIdle *clock_idle = GDK_FRAME_CLOCK_IDLE (clock);
GdkFrameClockIdlePrivate *priv = clock_idle->priv;
priv->requested |= phase;
maybe_start_idle (clock_idle);
}
static GdkFrameClockPhase
gdk_frame_clock_idle_get_requested (GdkFrameClock *clock)
{
GdkFrameClockIdlePrivate *priv = GDK_FRAME_CLOCK_IDLE (clock)->priv;
return priv->requested;
}
static void
gdk_frame_clock_idle_freeze (GdkFrameClock *clock)
{
GdkFrameClockIdlePrivate *priv = GDK_FRAME_CLOCK_IDLE (clock)->priv;
priv->freeze_count++;
if (priv->freeze_count == 1)
{
if (priv->flush_idle_id)
{
g_source_remove (priv->flush_idle_id);
priv->flush_idle_id = 0;
}
if (priv->paint_idle_id)
{
g_source_remove (priv->paint_idle_id);
priv->paint_idle_id = 0;
}
}
}
static void
gdk_frame_clock_idle_thaw (GdkFrameClock *clock)
{
GdkFrameClockIdle *clock_idle = GDK_FRAME_CLOCK_IDLE (clock);
GdkFrameClockIdlePrivate *priv = clock_idle->priv;
g_return_if_fail (priv->freeze_count > 0);
priv->freeze_count--;
if (priv->freeze_count == 0)
{
maybe_start_idle (clock_idle);
/* If nothing is requested so we didn't start an idle, we need
* to skip to the end of the state chain, since the idle won't
* run and do it for us. */
if (priv->paint_idle_id == 0)
priv->phase = GDK_FRAME_CLOCK_PHASE_NONE;
}
}
static GdkFrameHistory *
gdk_frame_clock_idle_get_history (GdkFrameClock *clock)
{
GdkFrameClockIdle *clock_idle = GDK_FRAME_CLOCK_IDLE (clock);
GdkFrameClockIdlePrivate *priv = clock_idle->priv;
return priv->history;
}
static void
gdk_frame_clock_idle_interface_init (GdkFrameClockInterface *iface)
{
iface->get_frame_time = gdk_frame_clock_idle_get_frame_time;
iface->request_phase = gdk_frame_clock_idle_request_phase;
iface->get_requested = gdk_frame_clock_idle_get_requested;
iface->freeze = gdk_frame_clock_idle_freeze;
iface->thaw = gdk_frame_clock_idle_thaw;
iface->get_history = gdk_frame_clock_idle_get_history;
}
GdkFrameClock *
_gdk_frame_clock_idle_new (void)
{
GdkFrameClockIdle *clock;
clock = g_object_new (GDK_TYPE_FRAME_CLOCK_IDLE, NULL);
return GDK_FRAME_CLOCK (clock);
}
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