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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the Qt Mobility Components.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, 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.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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"
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