forked from AuroraMiddleware/gtk
3246d6a738
Since commit 3b2f9395
, the frame time may be set into the future, so
only ensure monotonicity, and don't store the offset. This prevents the
frame time from becoming out of sync with g_get_monotonic_time().
Fixes #1612
614 lines
19 KiB
C
614 lines
19 KiB
C
/* GDK - The GIMP Drawing Kit
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Modified by the GTK+ Team and others 1997-2010. See the AUTHORS
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* file for a list of people on the GTK+ Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#include "config.h"
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#include "gdkinternals.h"
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#include "gdkframeclockprivate.h"
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#include "gdkframeclockidle.h"
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#include "gdk.h"
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#ifdef G_OS_WIN32
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#include <windows.h>
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#endif
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#define FRAME_INTERVAL 16667 /* microseconds */
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struct _GdkFrameClockIdlePrivate
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{
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gint64 frame_time;
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gint64 min_next_frame_time;
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gint64 sleep_serial;
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guint flush_idle_id;
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guint paint_idle_id;
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guint freeze_count;
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guint updating_count;
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GdkFrameClockPhase requested;
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GdkFrameClockPhase phase;
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guint in_paint_idle : 1;
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#ifdef G_OS_WIN32
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guint begin_period : 1;
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#endif
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};
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static gboolean gdk_frame_clock_flush_idle (void *data);
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static gboolean gdk_frame_clock_paint_idle (void *data);
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G_DEFINE_TYPE_WITH_PRIVATE (GdkFrameClockIdle, gdk_frame_clock_idle, GDK_TYPE_FRAME_CLOCK)
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static gint64 sleep_serial;
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static gint64 sleep_source_prepare_time;
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static GSource *sleep_source;
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static gboolean
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sleep_source_prepare (GSource *source,
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gint *timeout)
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{
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sleep_source_prepare_time = g_source_get_time (source);
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*timeout = -1;
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return FALSE;
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}
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static gboolean
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sleep_source_check (GSource *source)
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{
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if (g_source_get_time (source) != sleep_source_prepare_time)
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sleep_serial++;
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return FALSE;
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}
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static gboolean
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sleep_source_dispatch (GSource *source,
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GSourceFunc callback,
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gpointer user_data)
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{
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return TRUE;
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}
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static GSourceFuncs sleep_source_funcs = {
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sleep_source_prepare,
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sleep_source_check,
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sleep_source_dispatch,
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NULL /* finalize */
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};
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static gint64
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get_sleep_serial (void)
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{
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if (sleep_source == NULL)
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{
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sleep_source = g_source_new (&sleep_source_funcs, sizeof (GSource));
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g_source_set_priority (sleep_source, G_PRIORITY_HIGH);
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g_source_attach (sleep_source, NULL);
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g_source_unref (sleep_source);
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}
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return sleep_serial;
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}
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static void
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gdk_frame_clock_idle_init (GdkFrameClockIdle *frame_clock_idle)
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{
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GdkFrameClockIdlePrivate *priv;
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frame_clock_idle->priv = priv =
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gdk_frame_clock_idle_get_instance_private (frame_clock_idle);
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priv->frame_time = g_get_monotonic_time (); /* more sane than zero */
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priv->freeze_count = 0;
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}
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static void
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gdk_frame_clock_idle_dispose (GObject *object)
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{
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GdkFrameClockIdlePrivate *priv = GDK_FRAME_CLOCK_IDLE (object)->priv;
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if (priv->flush_idle_id != 0)
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{
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g_source_remove (priv->flush_idle_id);
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priv->flush_idle_id = 0;
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}
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if (priv->paint_idle_id != 0)
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{
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g_source_remove (priv->paint_idle_id);
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priv->paint_idle_id = 0;
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}
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#ifdef G_OS_WIN32
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if (priv->begin_period)
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{
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timeEndPeriod(1);
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priv->begin_period = FALSE;
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}
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#endif
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G_OBJECT_CLASS (gdk_frame_clock_idle_parent_class)->dispose (object);
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}
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static gint64
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compute_frame_time (GdkFrameClockIdle *idle)
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{
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GdkFrameClockIdlePrivate *priv = idle->priv;
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gint64 computed_frame_time;
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computed_frame_time = g_get_monotonic_time ();
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/* ensure monotonicity of frame time */
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if (computed_frame_time <= priv->frame_time)
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computed_frame_time = priv->frame_time + 1;
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return computed_frame_time;
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}
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static gint64
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gdk_frame_clock_idle_get_frame_time (GdkFrameClock *clock)
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{
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GdkFrameClockIdlePrivate *priv = GDK_FRAME_CLOCK_IDLE (clock)->priv;
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gint64 computed_frame_time;
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/* can't change frame time during a paint */
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if (priv->phase != GDK_FRAME_CLOCK_PHASE_NONE &&
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priv->phase != GDK_FRAME_CLOCK_PHASE_FLUSH_EVENTS)
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return priv->frame_time;
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/* Outside a paint, pick something close to "now" */
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computed_frame_time = compute_frame_time (GDK_FRAME_CLOCK_IDLE (clock));
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/* 16ms is 60fps. We only update frame time that often because we'd
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* like to try to keep animations on the same start times.
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* get_frame_time() would normally be used outside of a paint to
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* record an animation start time for example.
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*/
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if ((computed_frame_time - priv->frame_time) > FRAME_INTERVAL)
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priv->frame_time = computed_frame_time;
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return priv->frame_time;
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}
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#define RUN_FLUSH_IDLE(priv) \
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((priv)->freeze_count == 0 && \
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((priv)->requested & GDK_FRAME_CLOCK_PHASE_FLUSH_EVENTS) != 0)
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/* The reason why we track updating_count separately here and don't
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* just add GDK_FRAME_CLOCK_PHASE_UPDATE into ->request on every frame
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* is so that we can avoid doing one more frame when an animation
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* is cancelled.
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*/
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#define RUN_PAINT_IDLE(priv) \
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((priv)->freeze_count == 0 && \
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(((priv)->requested & ~GDK_FRAME_CLOCK_PHASE_FLUSH_EVENTS) != 0 || \
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(priv)->updating_count > 0))
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static void
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maybe_start_idle (GdkFrameClockIdle *clock_idle)
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{
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GdkFrameClockIdlePrivate *priv = clock_idle->priv;
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if (RUN_FLUSH_IDLE (priv) || RUN_PAINT_IDLE (priv))
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{
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guint min_interval = 0;
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if (priv->min_next_frame_time != 0)
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{
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gint64 now = compute_frame_time (clock_idle);
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gint64 min_interval_us = MAX (priv->min_next_frame_time, now) - now;
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min_interval = (min_interval_us + 500) / 1000;
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}
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if (priv->flush_idle_id == 0 && RUN_FLUSH_IDLE (priv))
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{
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priv->flush_idle_id = gdk_threads_add_timeout_full (GDK_PRIORITY_EVENTS + 1,
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min_interval,
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gdk_frame_clock_flush_idle,
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g_object_ref (clock_idle),
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(GDestroyNotify) g_object_unref);
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g_source_set_name_by_id (priv->flush_idle_id, "[gtk+] gdk_frame_clock_flush_idle");
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}
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if (!priv->in_paint_idle &&
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priv->paint_idle_id == 0 && RUN_PAINT_IDLE (priv))
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{
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priv->paint_idle_id = gdk_threads_add_timeout_full (GDK_PRIORITY_REDRAW,
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min_interval,
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gdk_frame_clock_paint_idle,
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g_object_ref (clock_idle),
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(GDestroyNotify) g_object_unref);
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g_source_set_name_by_id (priv->paint_idle_id, "[gtk+] gdk_frame_clock_paint_idle");
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}
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}
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}
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static void
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maybe_stop_idle (GdkFrameClockIdle *clock_idle)
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{
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GdkFrameClockIdlePrivate *priv = clock_idle->priv;
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if (priv->flush_idle_id != 0 && !RUN_FLUSH_IDLE (priv))
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{
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g_source_remove (priv->flush_idle_id);
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priv->flush_idle_id = 0;
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}
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if (priv->paint_idle_id != 0 && !RUN_PAINT_IDLE (priv))
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{
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g_source_remove (priv->paint_idle_id);
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priv->paint_idle_id = 0;
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}
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}
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static gint64
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compute_min_next_frame_time (GdkFrameClockIdle *clock_idle,
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gint64 last_frame_time)
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{
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gint64 presentation_time;
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gint64 refresh_interval;
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gdk_frame_clock_get_refresh_info (GDK_FRAME_CLOCK (clock_idle),
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last_frame_time,
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&refresh_interval, &presentation_time);
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if (presentation_time == 0)
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return last_frame_time + refresh_interval;
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else
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return presentation_time + refresh_interval / 2;
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}
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static gboolean
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gdk_frame_clock_flush_idle (void *data)
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{
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GdkFrameClock *clock = GDK_FRAME_CLOCK (data);
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GdkFrameClockIdle *clock_idle = GDK_FRAME_CLOCK_IDLE (clock);
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GdkFrameClockIdlePrivate *priv = clock_idle->priv;
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priv->flush_idle_id = 0;
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if (priv->phase != GDK_FRAME_CLOCK_PHASE_NONE)
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return FALSE;
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priv->phase = GDK_FRAME_CLOCK_PHASE_FLUSH_EVENTS;
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priv->requested &= ~GDK_FRAME_CLOCK_PHASE_FLUSH_EVENTS;
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_gdk_frame_clock_emit_flush_events (clock);
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if ((priv->requested & ~GDK_FRAME_CLOCK_PHASE_FLUSH_EVENTS) != 0 ||
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priv->updating_count > 0)
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priv->phase = GDK_FRAME_CLOCK_PHASE_BEFORE_PAINT;
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else
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priv->phase = GDK_FRAME_CLOCK_PHASE_NONE;
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return FALSE;
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}
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static gboolean
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gdk_frame_clock_paint_idle (void *data)
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{
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GdkFrameClock *clock = GDK_FRAME_CLOCK (data);
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GdkFrameClockIdle *clock_idle = GDK_FRAME_CLOCK_IDLE (clock);
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GdkFrameClockIdlePrivate *priv = clock_idle->priv;
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gboolean skip_to_resume_events;
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GdkFrameTimings *timings = NULL;
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priv->paint_idle_id = 0;
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priv->in_paint_idle = TRUE;
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priv->min_next_frame_time = 0;
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skip_to_resume_events =
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(priv->requested & ~(GDK_FRAME_CLOCK_PHASE_FLUSH_EVENTS | GDK_FRAME_CLOCK_PHASE_RESUME_EVENTS)) == 0 &&
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priv->updating_count == 0;
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if (priv->phase > GDK_FRAME_CLOCK_PHASE_BEFORE_PAINT)
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{
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timings = gdk_frame_clock_get_current_timings (clock);
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}
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if (!skip_to_resume_events)
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{
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switch (priv->phase)
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{
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case GDK_FRAME_CLOCK_PHASE_FLUSH_EVENTS:
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break;
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case GDK_FRAME_CLOCK_PHASE_NONE:
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case GDK_FRAME_CLOCK_PHASE_BEFORE_PAINT:
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if (priv->freeze_count == 0)
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{
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gint64 frame_interval = FRAME_INTERVAL;
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gint64 reset_frame_time;
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gint64 smoothest_frame_time;
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gint64 frame_time_error;
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GdkFrameTimings *prev_timings =
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gdk_frame_clock_get_current_timings (clock);
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if (prev_timings && prev_timings->refresh_interval)
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frame_interval = prev_timings->refresh_interval;
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/* We are likely not getting precisely even callbacks in real
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* time, particularly if the event loop is busy.
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* This is a documented limitation in the precision of
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* gdk_threads_add_timeout_full and g_timeout_add_full.
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*
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* In order to avoid this imprecision from compounding between
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* frames and affecting visual smoothness, we correct frame_time
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* to more precisely match the even refresh interval of the
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* physical display. This also means we proactively avoid (most)
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* missed frames before they occur.
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*/
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smoothest_frame_time = priv->frame_time + frame_interval;
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reset_frame_time = compute_frame_time (clock_idle);
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frame_time_error = ABS (reset_frame_time - smoothest_frame_time);
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if (frame_time_error >= frame_interval)
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priv->frame_time = reset_frame_time;
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else
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priv->frame_time = smoothest_frame_time;
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_gdk_frame_clock_begin_frame (clock);
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/* Note "current" is different now so timings != prev_timings */
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timings = gdk_frame_clock_get_current_timings (clock);
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timings->frame_time = priv->frame_time;
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timings->slept_before = priv->sleep_serial != get_sleep_serial ();
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priv->phase = GDK_FRAME_CLOCK_PHASE_BEFORE_PAINT;
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/* We always emit ::before-paint and ::after-paint if
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* any of the intermediate phases are requested and
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* they don't get repeated if you freeze/thaw while
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* in them.
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*/
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priv->requested &= ~GDK_FRAME_CLOCK_PHASE_BEFORE_PAINT;
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_gdk_frame_clock_emit_before_paint (clock);
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priv->phase = GDK_FRAME_CLOCK_PHASE_UPDATE;
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}
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/* fallthrough */
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case GDK_FRAME_CLOCK_PHASE_UPDATE:
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if (priv->freeze_count == 0)
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{
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if ((priv->requested & GDK_FRAME_CLOCK_PHASE_UPDATE) != 0 ||
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priv->updating_count > 0)
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{
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priv->requested &= ~GDK_FRAME_CLOCK_PHASE_UPDATE;
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_gdk_frame_clock_emit_update (clock);
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}
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}
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/* fallthrough */
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case GDK_FRAME_CLOCK_PHASE_LAYOUT:
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if (priv->freeze_count == 0)
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{
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int iter;
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#ifdef G_ENABLE_DEBUG
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if (GDK_DEBUG_CHECK (FRAMES))
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{
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if (priv->phase != GDK_FRAME_CLOCK_PHASE_LAYOUT &&
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(priv->requested & GDK_FRAME_CLOCK_PHASE_LAYOUT))
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timings->layout_start_time = g_get_monotonic_time ();
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}
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#endif /* G_ENABLE_DEBUG */
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priv->phase = GDK_FRAME_CLOCK_PHASE_LAYOUT;
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/* We loop in the layout phase, because we don't want to progress
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* into the paint phase with invalid size allocations. This may
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* happen in some situation like races between user window
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* resizes and natural size changes.
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*/
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iter = 0;
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while ((priv->requested & GDK_FRAME_CLOCK_PHASE_LAYOUT) &&
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priv->freeze_count == 0 && iter++ < 4)
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{
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priv->requested &= ~GDK_FRAME_CLOCK_PHASE_LAYOUT;
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_gdk_frame_clock_emit_layout (clock);
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}
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if (iter == 5)
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g_warning ("gdk-frame-clock: layout continuously requested, giving up after 4 tries");
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}
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/* fallthrough */
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case GDK_FRAME_CLOCK_PHASE_PAINT:
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if (priv->freeze_count == 0)
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{
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#ifdef G_ENABLE_DEBUG
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if (GDK_DEBUG_CHECK (FRAMES))
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{
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if (priv->phase != GDK_FRAME_CLOCK_PHASE_PAINT &&
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(priv->requested & GDK_FRAME_CLOCK_PHASE_PAINT))
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timings->paint_start_time = g_get_monotonic_time ();
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}
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#endif /* G_ENABLE_DEBUG */
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priv->phase = GDK_FRAME_CLOCK_PHASE_PAINT;
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if (priv->requested & GDK_FRAME_CLOCK_PHASE_PAINT)
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{
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priv->requested &= ~GDK_FRAME_CLOCK_PHASE_PAINT;
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_gdk_frame_clock_emit_paint (clock);
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}
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}
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/* fallthrough */
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case GDK_FRAME_CLOCK_PHASE_AFTER_PAINT:
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if (priv->freeze_count == 0)
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{
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priv->requested &= ~GDK_FRAME_CLOCK_PHASE_AFTER_PAINT;
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_gdk_frame_clock_emit_after_paint (clock);
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/* the ::after-paint phase doesn't get repeated on freeze/thaw,
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*/
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priv->phase = GDK_FRAME_CLOCK_PHASE_NONE;
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#ifdef G_ENABLE_DEBUG
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if (GDK_DEBUG_CHECK (FRAMES))
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timings->frame_end_time = g_get_monotonic_time ();
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#endif /* G_ENABLE_DEBUG */
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}
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/* fallthrough */
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case GDK_FRAME_CLOCK_PHASE_RESUME_EVENTS:
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;
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}
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}
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#ifdef G_ENABLE_DEBUG
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if (GDK_DEBUG_CHECK (FRAMES))
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{
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if (timings && timings->complete)
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_gdk_frame_clock_debug_print_timings (clock, timings);
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}
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#endif /* G_ENABLE_DEBUG */
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if (priv->requested & GDK_FRAME_CLOCK_PHASE_RESUME_EVENTS)
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{
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priv->requested &= ~GDK_FRAME_CLOCK_PHASE_RESUME_EVENTS;
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_gdk_frame_clock_emit_resume_events (clock);
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}
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if (priv->freeze_count == 0)
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priv->phase = GDK_FRAME_CLOCK_PHASE_NONE;
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priv->in_paint_idle = FALSE;
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/* If there is throttling in the backend layer, then we'll do another
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* update as soon as the backend unthrottles (if there is work to do),
|
|
* otherwise we need to figure when the next frame should be.
|
|
*/
|
|
if (priv->freeze_count == 0)
|
|
{
|
|
priv->min_next_frame_time = compute_min_next_frame_time (clock_idle,
|
|
priv->frame_time);
|
|
maybe_start_idle (clock_idle);
|
|
}
|
|
|
|
if (priv->freeze_count == 0)
|
|
priv->sleep_serial = get_sleep_serial ();
|
|
|
|
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 void
|
|
gdk_frame_clock_idle_begin_updating (GdkFrameClock *clock)
|
|
{
|
|
GdkFrameClockIdle *clock_idle = GDK_FRAME_CLOCK_IDLE (clock);
|
|
GdkFrameClockIdlePrivate *priv = clock_idle->priv;
|
|
|
|
#ifdef G_OS_WIN32
|
|
/* We need a higher resolution timer while doing animations */
|
|
if (priv->updating_count == 0 && !priv->begin_period)
|
|
{
|
|
timeBeginPeriod(1);
|
|
priv->begin_period = TRUE;
|
|
}
|
|
#endif
|
|
|
|
priv->updating_count++;
|
|
maybe_start_idle (clock_idle);
|
|
}
|
|
|
|
static void
|
|
gdk_frame_clock_idle_end_updating (GdkFrameClock *clock)
|
|
{
|
|
GdkFrameClockIdle *clock_idle = GDK_FRAME_CLOCK_IDLE (clock);
|
|
GdkFrameClockIdlePrivate *priv = clock_idle->priv;
|
|
|
|
g_return_if_fail (priv->updating_count > 0);
|
|
|
|
priv->updating_count--;
|
|
maybe_stop_idle (clock_idle);
|
|
|
|
#ifdef G_OS_WIN32
|
|
if (priv->updating_count == 0 && priv->begin_period)
|
|
{
|
|
timeEndPeriod(1);
|
|
priv->begin_period = FALSE;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
gdk_frame_clock_idle_freeze (GdkFrameClock *clock)
|
|
{
|
|
GdkFrameClockIdle *clock_idle = GDK_FRAME_CLOCK_IDLE (clock);
|
|
GdkFrameClockIdlePrivate *priv = clock_idle->priv;
|
|
|
|
priv->freeze_count++;
|
|
maybe_stop_idle (clock_idle);
|
|
}
|
|
|
|
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;
|
|
|
|
priv->sleep_serial = get_sleep_serial ();
|
|
}
|
|
}
|
|
|
|
static void
|
|
gdk_frame_clock_idle_class_init (GdkFrameClockIdleClass *klass)
|
|
{
|
|
GObjectClass *gobject_class = (GObjectClass*) klass;
|
|
GdkFrameClockClass *frame_clock_class = (GdkFrameClockClass *)klass;
|
|
|
|
gobject_class->dispose = gdk_frame_clock_idle_dispose;
|
|
|
|
frame_clock_class->get_frame_time = gdk_frame_clock_idle_get_frame_time;
|
|
frame_clock_class->request_phase = gdk_frame_clock_idle_request_phase;
|
|
frame_clock_class->begin_updating = gdk_frame_clock_idle_begin_updating;
|
|
frame_clock_class->end_updating = gdk_frame_clock_idle_end_updating;
|
|
frame_clock_class->freeze = gdk_frame_clock_idle_freeze;
|
|
frame_clock_class->thaw = gdk_frame_clock_idle_thaw;
|
|
}
|
|
|
|
GdkFrameClock *
|
|
_gdk_frame_clock_idle_new (void)
|
|
{
|
|
GdkFrameClockIdle *clock;
|
|
|
|
clock = g_object_new (GDK_TYPE_FRAME_CLOCK_IDLE, NULL);
|
|
|
|
return GDK_FRAME_CLOCK (clock);
|
|
}
|