Method tryLock

Engine/Node.cpp:4410–4425

}

bool
Node::tryLock(const ImagePtr & image)
{
    QMutexLocker l(&_imp->imagesBeingRenderedMutex);
    std::list<ImagePtr>::iterator it =
        std::find(_imp->imagesBeingRendered.begin(), _imp->imagesBeingRendered.end(), image);

    if ( it != _imp->imagesBeingRendered.end() ) {
        return false;
    }
    ///Okay the image is not used by any other thread, claim that we want to use it
    assert( it == _imp->imagesBeingRendered.end() );
    _imp->imagesBeingRendered.push_back(image);

    return true;
}

void
Node::unlock(const ImagePtr & image)