diff options
Diffstat (limited to 'basicsuite/ebike-ui/fpscounter.cpp')
-rw-r--r-- | basicsuite/ebike-ui/fpscounter.cpp | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/basicsuite/ebike-ui/fpscounter.cpp b/basicsuite/ebike-ui/fpscounter.cpp new file mode 100644 index 0000000..137dcb4 --- /dev/null +++ b/basicsuite/ebike-ui/fpscounter.cpp @@ -0,0 +1,79 @@ +/**************************************************************************** +** +** Copyright (C) 2017 The Qt Company Ltd. +** Contact: http://www.qt.io/licensing/ +** +** This file is part of the E-Bike demo project. +** +** $QT_BEGIN_LICENSE:LGPL3$ +** 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 http://www.qt.io/terms-conditions. For further +** information use the contact form at http://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPLv3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or later as published by the Free +** Software Foundation and appearing in the file LICENSE.GPL included in +** the packaging of this file. Please review the following information to +** ensure the GNU General Public License version 2.0 requirements will be +** met: http://www.gnu.org/licenses/gpl-2.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <QQuickWindow> + +#include "fpscounter.h" + +FpsCounter::FpsCounter(QObject *parent) + : QObject(parent) + , m_frameCounter(0) + , m_fps(0.0) + , m_visible(false) +{ +} + +void FpsCounter::setVisible(bool visible) +{ + if (m_visible == visible) + return; + + m_visible = visible; + emit visibleChanged(m_visible); +} + +void FpsCounter::setWindow(QQuickWindow *window) +{ + connect(window, &QQuickWindow::frameSwapped, this, &FpsCounter::frameUpdated); + startTimer(1000); + m_timer.start(); +} + +void FpsCounter::timerEvent(QTimerEvent *) +{ + // Calculate new FPS + qreal newfps = qRound(m_frameCounter * 1000.0 / m_timer.elapsed()); + m_frameCounter = 0; + m_timer.start(); + + // If there is no change, do nothing + if (qFuzzyCompare(m_fps, newfps)) + return; + + // Otherwise emit new fps + m_fps = newfps; + emit fpsChanged(m_fps); +} |