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/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Kria Cluster 2D Demo.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * 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.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "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 THE COPYRIGHT
** OWNER 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."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "fps.h"
#include <QtCore/qdatetime.h>
#include <QtGui/qbrush.h>
#include <QtGui/qpainter.h>
FPS::FPS(QQuickItem *parent): QQuickPaintedItem(parent), m_currentFPS(0), m_cachedFPS(0)
{
m_paintPasses.clear();
setFlag(QQuickItem::ItemHasContents);
}
FPS::~FPS()
{
}
void FPS::updateFPS()
{
qint64 currentTime = QDateTime::currentDateTime().toMSecsSinceEpoch();
m_paintPasses.push_back(currentTime);
while (m_paintPasses[0] < currentTime - 1000)
m_paintPasses.pop_front();
int currentCount = m_paintPasses.length();
m_currentFPS = (currentCount + m_cachedFPS) / 2;
if (currentCount != m_cachedFPS)
fpsChanged(m_currentFPS);
m_cachedFPS = currentCount;
}
int FPS::fps()const
{
return m_currentFPS;
}
void FPS::paint(QPainter *painter)
{
updateFPS();
painter->setPen(Qt::NoPen);
painter->setRenderHint(QPainter::Antialiasing);
painter->drawRoundedRect(0, 0, boundingRect().width(), boundingRect().height(), 0, 0);
update();
}
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