Method startRender

Engine/OutputSchedulerThread.cpp:1028–1134

}

void
OutputSchedulerThread::startRender()
{
    if ( isFPSRegulationNeeded() ) {
        _imp->timer.playState = ePlayStateRunning;
    }

    // Start measuring
    _imp->renderTimer.reset(new TimeLapse);

    ///We will push frame to renders starting at startingFrame.
    ///They will be in the range determined by firstFrame-lastFrame
    int startingFrame;
    int firstFrame, lastFrame;
    int frameStep;
    bool forward;
    OutputSchedulerThreadStartArgsPtr args = _imp->runArgs.lock();
    ///Copy the last requested run args

    firstFrame = args->firstFrame;
    lastFrame = args->lastFrame;
    frameStep = args->frameStep;
    startingFrame = timelineGetTime();
    forward = args->pushTimelineDirection == eRenderDirectionForward;


    aboutToStartRender();

    ///Notify everyone that the render is started
    _imp->engine->s_renderStarted(forward);

#ifndef NATRON_PLAYBACK_USES_THREAD_POOL
    int nThreads;
    {
        QMutexLocker l(&_imp->renderThreadsMutex);
        _imp->removeAllQuitRenderThreads();
        nThreads = (int)_imp->renderThreads.size();
    }

    ///Start with one thread if it doesn't exist
    if (nThreads == 0) {
        int lastNThreads;
        adjustNumberOfThreads(&nThreads, &lastNThreads);
    }
#endif

    QMutexLocker l(&_imp->renderThreadsMutex);


    ///If the output effect is sequential (only WriteFFMPEG for now)
    EffectInstancePtr effect = _imp->outputEffect.lock();
    WriteNode* isWriteNode = dynamic_cast<WriteNode*>( effect.get() );
    if (isWriteNode) {
        NodePtr embeddedWriter = isWriteNode->getEmbeddedWriter();
        if (embeddedWriter) {
            effect = embeddedWriter->getEffectInstance();
        }
    }