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tikzpreviewthread.cpp

/***************************************************************************
 *   Copyright (C) 2007, 2008, 2009 by Glad Deschrijver                    *
 *     <glad.deschrijver@gmail.com>                                        *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, see <http://www.gnu.org/licenses/>.  *
 ***************************************************************************/

#include "tikzpreviewthread.h"

#include <QImage>

#include <poppler-qt4.h>

TikzPreviewThread::TikzPreviewThread(QObject *parent)
    : QThread(parent)
{
      m_restart = false;
      m_abort = false;

      setTerminationEnabled(true);
}

TikzPreviewThread::~TikzPreviewThread()
{
      m_mutex.lock();
      m_abort = true;
      m_condition.wakeOne();
      m_mutex.unlock();

      wait();
}

void TikzPreviewThread::generatePreview(Poppler::Document *tikzPdfDoc, qreal zoomFactor, int currentPage)
{
      QMutexLocker locker(&m_mutex);

      m_tikzPdfDoc = tikzPdfDoc;
      m_zoomFactor = zoomFactor;
      m_currentPage = currentPage;

      if (!isRunning())
      {
            start(LowPriority);
      }
      else
      {
//          m_restart = true;
//          m_condition.wakeOne();

            m_abort = true;
            m_condition.wakeAll();
            m_abort = false;
            m_restart = true;
//          start(LowPriority);
      }
}

void TikzPreviewThread::run()
{
      while (true)
      {
            if (m_abort)
                  return;

            m_mutex.lock();
            Poppler::Page *pdfPage = m_tikzPdfDoc->page(m_currentPage);
            const qreal zoomFactor = m_zoomFactor;
            m_mutex.unlock();
            const QImage tikzImage = pdfPage->renderToImage(zoomFactor * 72, zoomFactor * 72);
            delete pdfPage;

            emit showPreview(tikzImage);

            // sleep
            m_mutex.lock();
            if (!m_restart)
                  m_condition.wait(&m_mutex);
            m_restart = false;
            m_mutex.unlock();
      }
}

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