Method createReadNode

Engine/ReadNode.cpp:645–802

}

void
ReadNodePrivate::createReadNode(bool throwErrors,
                                const std::string& filename,
                                const NodeSerializationPtr& serialization)
{
    if (creatingReadNode) {
        return;
    }

    SetCreatingReaderRAIIFlag creatingNode__(this);
    QString qpattern = QString::fromUtf8( filename.c_str() );
    std::string ext = QtCompat::removeFileExtension(qpattern).toLower().toStdString();
    std::string readerPluginID;
    KnobStringPtr pluginIDKnob = pluginIDStringKnob.lock();
    readerPluginID = pluginIDKnob->getValue();


    if ( readerPluginID.empty() ) {
        KnobChoicePtr pluginChoiceKnob = pluginSelectorKnob.lock();
        int pluginChoice_i = pluginChoiceKnob->getValue();
        if (pluginChoice_i == 0) {
            //Use default
            readerPluginID = appPTR->getReaderPluginIDForFileType(ext);
        } else {
            std::vector<ChoiceOption> entries = pluginChoiceKnob->getEntries_mt_safe();
            if ( (pluginChoice_i >= 0) && ( pluginChoice_i < (int)entries.size() ) ) {
                readerPluginID = entries[pluginChoice_i].id;
            }
        }
    }

    // If the plug-in is the same, do not create a new decoder.
    if (embeddedPlugin && embeddedPlugin->getPluginID() == readerPluginID) {
        KnobFilePtr fileKnob = inputFileKnob.lock();
        assert(fileKnob);
        if (fileKnob) {
            // Make sure instance changed action is called on the decoder and not caught in our knobChanged handler.
            embeddedPlugin->getEffectInstance()->onKnobValueChanged_public(fileKnob.get(), eValueChangedReasonNatronInternalEdited, _publicInterface->getCurrentTime(), ViewSpec(0), true);

        }

        return;
    }
    //Destroy any previous reader
    //This will store the serialization of the generic knobs
    destroyReadNode();

    bool defaultFallback = false;

    if (readerPluginID.empty()) {
        if (throwErrors) {
            QString message = tr("Could not find a decoder to read %1 file format")
            .arg( QString::fromUtf8( ext.c_str() ) );
            throw std::runtime_error( message.toStdString() );
        }
        defaultFallback = true;

    }