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-/****************************************************************************
-**
-** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
-** All rights reserved.
-** Contact: Nokia Corporation (qt-info@nokia.com)
-**
-** This file is part of the plugins of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** 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_BEGIN_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);
-}
-
-QT_END_NAMESPACE
-
-#include "moc_qcvdisplaylink.cpp"
-