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Diffstat (limited to 'fps.cpp')
-rw-r--r-- | fps.cpp | 97 |
1 files changed, 97 insertions, 0 deletions
@@ -0,0 +1,97 @@ +/**************************************************************************** +** +** 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(); +} |