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/*
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "fpstimer.h"
#include <QDateTime>
#include <QTimerEvent>
// We save a maximum of 10000 frames, and purge 2000 at a time
#define MAX_FRAMES_SAVED 10000
#define FRAMES_TO_PURGE_WHEN_FULL 2000
// 60 FPS
#define FPS_MEASURE_INTERVAL 1000 / 60
FpsTimer::FpsTimer(QObject* parent)
: QObject(parent)
, m_timer(0)
{
}
int FpsTimer::numFrames(int spanMillis) const
{
const QTime now = QTime::currentTime();
int count = 0;
for (int i = m_frames.length() - 1; i >= 0; --i, ++count) {
int msecs = m_frames[i].msecsTo(now);
if (msecs < 0)
msecs += 24 * 60 * 60 * 1000;
if (msecs > spanMillis)
break;
}
return count;
}
void FpsTimer::start()
{
m_timer = startTimer(FPS_MEASURE_INTERVAL);
}
void FpsTimer::stop()
{
if (!m_timer)
return;
killTimer(m_timer);
m_frames.clear();
}
void FpsTimer::timerEvent(QTimerEvent* event)
{
if (event->timerId() != m_timer)
return;
m_frames.append(QTime::currentTime());
if (m_frames.length() > MAX_FRAMES_SAVED)
m_frames.erase(m_frames.begin(), m_frames.begin() + FRAMES_TO_PURGE_WHEN_FULL);
}
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