Method addUserComponents

Engine/Node.cpp:7255–7298

} // Node::refreshChannelSelectors()

bool
Node::addUserComponents(const ImagePlaneDesc& comps)
{
    ///The node has node channel selector, don't allow adding a custom plane.
    KnobIPtr outputLayerKnob = getKnobByName(kNatronOfxParamOutputChannels);

    if (_imp->channelsSelectors.empty() && !outputLayerKnob) {
        return false;
    }

    if (!outputLayerKnob) {
        //The effect does not have kNatronOfxParamOutputChannels but maybe the selector provided by Natron
        std::map<int, ChannelSelector>::iterator found = _imp->channelsSelectors.find(-1);
        if ( found == _imp->channelsSelectors.end() ) {
            return false;
        }
        outputLayerKnob = found->second.layer.lock();
    }

    {
        QMutexLocker k(&_imp->createdComponentsMutex);
        for (std::list<ImagePlaneDesc>::iterator it = _imp->createdComponents.begin(); it != _imp->createdComponents.end(); ++it) {
            if ( it->getPlaneID() == comps.getPlaneID() ) {
                return false;
            }
        }

        _imp->createdComponents.push_back(comps);
    }
    if (!_imp->isRefreshingInputRelatedData) {
        ///Clip preferences have changed
        RenderScale s(1.);
        getEffectInstance()->refreshMetadata_public(true);
    }
    {
        ///Set the selector to the new channel
        KnobChoice* layerChoice = dynamic_cast<KnobChoice*>( outputLayerKnob.get() );
        if (layerChoice) {
            layerChoice->setValueFromID(comps.getPlaneID(), 0);
        }
    }

    return true;
}

void
Node::getUserCreatedComponents(std::list<ImagePlaneDesc>* comps)