Method getPreferredInputInternal

Engine/NodeInputs.cpp:1393–1506

}

int
Node::getPreferredInputInternal(bool connected) const
{
    int nInputs = getNInputs();

    if (nInputs == 0) {
        return -1;
    }
    std::vector<NodePtr> inputs(nInputs);
    std::vector<std::string> inputLabels(nInputs);
    int inputA = -1;
    int inputB = -1;
    {
        // fill input labels, and if one is called "Source", return it
        // if it's "A" or "B", keep the index.
        for (int i = 0; i < nInputs; ++i) {
            std::string inputLabel = getInputLabel(i);
            //printf("%d->%s\n", i, inputLabel.c_str());
            if (inputLabel == kOfxImageEffectSimpleSourceClipName) {
                inputs[i] = getInput(i);
                if ( (connected && inputs[i]) || (!connected && !inputs[i]) ) {
                    return i;
                }
            } else if (inputLabel == "A") {
                inputA = i;
            } else if (inputLabel == "B") {
                inputB = i;
            }
        }
    }
    bool useInputA = false;
    if (!connected) {
        // For the merge node, use the preference (only when not connected)
        useInputA = appPTR->getCurrentSettings()->useInputAForMergeAutoConnect();
    }

    ///Find an input named A
    int inputToFind = -1, foundOther = -1;
    if ( useInputA || (getPluginID() == PLUGINID_OFX_SHUFFLE && getMajorVersion() < 3) ) {
        inputToFind = inputA;
        foundOther = inputB;
    } else {
        inputToFind = inputB;
        foundOther = inputA;
    }
    if (inputToFind != -1) {
        inputs[inputToFind] = getInput(inputToFind);
        if ( (connected && inputs[inputToFind]) || (!connected && !inputs[inputToFind]) ) {
            return inputToFind;
        }
    }
    if (foundOther != -1) {
        inputs[foundOther] = getInput(foundOther);
        if ( (connected && inputs[foundOther]) || (!connected && !inputs[foundOther]) ) {
            return foundOther;
        }
    }