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
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 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 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qcvdisplaylink.h"
#include <QtCore/qcoreapplication.h>
#include <QtCore/qdebug.h>
QT_USE_NAMESPACE
static CVReturn CVDisplayLinkCallback(CVDisplayLinkRef displayLink,
const CVTimeStamp *inNow,
const CVTimeStamp *inOutputTime,
CVOptionFlags flagsIn,
CVOptionFlags *flagsOut,
void *displayLinkContext)
{
Q_UNUSED(displayLink);
Q_UNUSED(inNow);
Q_UNUSED(flagsIn);
Q_UNUSED(flagsOut);
QCvDisplayLink *link = (QCvDisplayLink *)displayLinkContext;
link->displayLinkEvent(inOutputTime);
return kCVReturnSuccess;
}
QCvDisplayLink::QCvDisplayLink(QObject *parent)
:QObject(parent),
m_pendingDisplayLinkEvent(false),
m_isActive(false)
{
// create display link for the main display
CVDisplayLinkCreateWithCGDisplay(kCGDirectMainDisplay, &m_displayLink);
if (m_displayLink) {
// set the current display of a display link.
CVDisplayLinkSetCurrentCGDisplay(m_displayLink, kCGDirectMainDisplay);
// set the renderer output callback function
CVDisplayLinkSetOutputCallback(m_displayLink, &CVDisplayLinkCallback, this);
}
}
QCvDisplayLink::~QCvDisplayLink()
{
if (m_displayLink) {
CVDisplayLinkStop(m_displayLink);
CVDisplayLinkRelease(m_displayLink);
m_displayLink = NULL;
}
}
bool QCvDisplayLink::isValid()
{
return m_displayLink != 0;
}
bool QCvDisplayLink::isActive() const
{
return m_isActive;
}
void QCvDisplayLink::start()
{
if (m_displayLink && !m_isActive) {
CVDisplayLinkStart(m_displayLink);
m_isActive = true;
}
}
void QCvDisplayLink::stop()
{
if (m_displayLink && m_isActive) {
CVDisplayLinkStop(m_displayLink);
m_isActive = false;
}
}
void QCvDisplayLink::displayLinkEvent(const CVTimeStamp *ts)
{
// This function is called from a
// thread != gui thread. So we post the event.
// But we need to make sure that we don't post faster
// than the event loop can eat:
m_displayLinkMutex.lock();
bool pending = m_pendingDisplayLinkEvent;
m_pendingDisplayLinkEvent = true;
m_frameTimeStamp = *ts;
m_displayLinkMutex.unlock();
if (!pending)
qApp->postEvent(this, new QEvent(QEvent::User), Qt::HighEventPriority);
}
bool QCvDisplayLink::event(QEvent *event)
{
switch (event->type()){
case QEvent::User: {
m_displayLinkMutex.lock();
m_pendingDisplayLinkEvent = false;
CVTimeStamp ts = m_frameTimeStamp;
m_displayLinkMutex.unlock();
emit tick(ts);
return false;
}
break;
default:
break;
}
return QObject::event(event);
}
#include "moc_qcvdisplaylink.cpp"
|
