qt-everywhere-src-5.15.1/qtwebengine/src/core/compositor/display_frame_sink.cpp

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#include "display_frame_sink.h"

#include <QMap>

namespace QtWebEngineCore {

namespace {

class DisplayFrameSinkMap
{
public:
    static DisplayFrameSinkMap *instance()
    {
        static DisplayFrameSinkMap map;
        return &map;
    }

    scoped_refptr<DisplayFrameSink> findOrCreate(viz::FrameSinkId frameSinkId)
    {
        QMutexLocker locker(&m_mutex);
        auto it = m_map.find(frameSinkId);
        if (it == m_map.end())
            it = m_map.insert(frameSinkId, new DisplayFrameSink(frameSinkId));
        return *it;
    }

    void remove(viz::FrameSinkId frameSinkId)
    {
        QMutexLocker locker(&m_mutex);
        m_map.remove(frameSinkId);
    }

private:
    mutable QMutex m_mutex;
    QMap<viz::FrameSinkId, DisplayFrameSink *> m_map;
};

} // namespace

// static
scoped_refptr<DisplayFrameSink> DisplayFrameSink::findOrCreate(viz::FrameSinkId frameSinkId)
{
    return DisplayFrameSinkMap::instance()->findOrCreate(frameSinkId);
}

DisplayFrameSink::DisplayFrameSink(viz::FrameSinkId frameSinkId)
    : m_frameSinkId(frameSinkId)
{
    DCHECK(m_frameSinkId.is_valid());
}

DisplayFrameSink::~DisplayFrameSink()
{
    DisplayFrameSinkMap::instance()->remove(m_frameSinkId);
}

void DisplayFrameSink::connect(DisplayConsumer *consumer)
{
    QMutexLocker locker(&m_mutex);
    DCHECK(m_consumer == nullptr);
    m_consumer = consumer;
}

void DisplayFrameSink::connect(DisplayProducer *producer)
{
    QMutexLocker locker(&m_mutex);
    DCHECK(m_producer == nullptr);
    m_producer = producer;
}

void DisplayFrameSink::disconnect(DisplayConsumer *consumer)
{
    QMutexLocker locker(&m_mutex);
    DCHECK(m_consumer == consumer);
    m_consumer = nullptr;
}

void DisplayFrameSink::disconnect(DisplayProducer *producer)
{
    QMutexLocker locker(&m_mutex);
    DCHECK(m_producer == producer);
    m_producer = nullptr;
}

void DisplayFrameSink::scheduleUpdate()
{
    QMutexLocker locker(&m_mutex);
    if (m_consumer)
        m_consumer->scheduleUpdate();
}

QSGNode *DisplayFrameSink::updatePaintNode(QSGNode *oldNode, RenderWidgetHostViewQtDelegate *delegate)
{
    QMutexLocker locker(&m_mutex);
    QSGNode *newNode = oldNode;
    if (m_producer)
        newNode = m_producer->updatePaintNode(oldNode, delegate);
    return newNode;
}

} // namespace QtWebEngineCore