Method execute

ImagePlay/src/IPProcessGrid.cpp:257–415

! * \brief IPProcessGrid::execute */

 * \brief IPProcessGrid::execute
 */
void IPProcessGrid::execute(bool forcedUpdate /* = false*/)
{
    // if no processes yet, then exit
    if(_scene->steps()->size() < 1)
    {
        return;
    }

    // if already running or nothing has changed, exit
    if(_isRunning || !_updateNeeded)
    {
        return;
    }
    // prevent user changes during execution
    _mainWindow->lockScene();
    _isRunning = true;
    _sequenceCount = 0;

    buildQueue();

    int totalDurationMs = 0;

    // execute the processes
    int counter = 0;
    int limit = 10000;
    bool blockFailLoop = false;

    QList<IPProcessStep*> afterProcessingList;

    QListIterator<IPProcessStep *> it(_processList);
    while (it.hasNext() && counter < limit)
    {
        if(_stopExecution)
            return;

        IPProcessStep* step = it.next();
        _currentStep = step;

        // make sure the progress bar gets filled
        updateProgress(1);

        // source processes don't have inputs
        if(step->process()->isSource())
        {
            // execute thread
            if(step->process()->updateNeeded() || forcedUpdate)
            {
                step->process()->resetMessages();
                step->process()->beforeProcessing();
                int durationMs = executeThread(step->process());
                if ( !_lastProcessSuccess ) blockFailLoop = true;

                // afterProcessing will be called later
                afterProcessingList.append(step);

                totalDurationMs += durationMs;
                step->setDuration(durationMs);