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Diffstat (limited to 'src/plugins/mediaservices/qt7/qcvdisplaylink.mm')
-rw-r--r-- | src/plugins/mediaservices/qt7/qcvdisplaylink.mm | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/src/plugins/mediaservices/qt7/qcvdisplaylink.mm b/src/plugins/mediaservices/qt7/qcvdisplaylink.mm new file mode 100644 index 0000000..00b4dc5 --- /dev/null +++ b/src/plugins/mediaservices/qt7/qcvdisplaylink.mm @@ -0,0 +1,158 @@ +/**************************************************************************** +** +** 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" + |