blob: 137dcb4a841fd7e3eff0610ceead5d3625fa07fb (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
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);
}
|
