Method refreshRotoPaintTree

Engine/RotoContext.cpp:4711–4774

} // RotoContext::getOrCreateGlobalMergeNode

void
RotoContext::refreshRotoPaintTree()
{
    if (_imp->isCurrentlyLoading) {
        return;
    }

    // Do not use only activated items when defining the shape of the RotoPaint tree otherwise we would have to adjust the tree at each frame.
    std::list<RotoDrawableItemPtr> items = getCurvesByRenderOrder(false /*onlyActivatedItems*/);
    int blendingOperator;
    bool canConcatenate = isRotoPaintTreeConcatenatableInternal(items, &blendingOperator);
    NodePtr globalMerge;
    int globalMergeIndex = -1;
    NodesList mergeNodes;
    {
        QMutexLocker k(&_imp->rotoContextMutex);
        mergeNodes = _imp->globalMergeNodes;
    }
    //ensure that all global merge nodes are disconnected
    for (NodesList::iterator it = mergeNodes.begin(); it != mergeNodes.end(); ++it) {
        int maxInputs = (*it)->getNInputs();
        for (int i = 0; i < maxInputs; ++i) {
            (*it)->disconnectInput(i);
        }
    }
    if (canConcatenate) {
        globalMerge = getOrCreateGlobalMergeNode(&globalMergeIndex);
    }
    if (globalMerge) {
        NodePtr rotopaintNodeInput = getNode()->getInput(0);
        //Connect the rotopaint node input to the B input of the Merge
        if (rotopaintNodeInput) {
            globalMerge->connectInput(rotopaintNodeInput, 0);
        }
    }

    for (std::list<RotoDrawableItemPtr>::const_iterator it = items.begin(); it != items.end(); ++it) {
        (*it)->refreshNodesConnections();

        if (globalMerge) {
            {
                KnobIPtr mergeOperatorKnob = globalMerge->getKnobByName(kMergeOFXParamOperation);
                KnobChoice* mergeOp = dynamic_cast<KnobChoice*>( mergeOperatorKnob.get() );
                if (mergeOp) {
                    mergeOp->setValue(blendingOperator);
                }
            }

            NodePtr effectNode = (*it)->getEffectNode();
            assert(effectNode);
            //qDebug() << "Connecting" << (*it)->getScriptName().c_str() << "to input" << globalMergeIndex <<
            //"(" << globalMerge->getInputLabel(globalMergeIndex).c_str() << ")" << "of" << globalMerge->getScriptName().c_str();
            globalMerge->connectInput(effectNode, globalMergeIndex);

            ///Refresh for next node
            NodePtr nextMerge = getOrCreateGlobalMergeNode(&globalMergeIndex);
            if (nextMerge != globalMerge) {
                assert( !nextMerge->getInput(0) );