Qt Reference Documentation

# renderthread.cpp Example File

threads/queuedcustomtype/renderthread.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
     ** All rights reserved.
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
     **     the names of its contributors may be used to endorse or promote
     **     products derived from this software without specific prior written
     **     permission.
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     #include "renderthread.h"

     RenderThread::RenderThread(QObject *parent)
         : QThread(parent)
     {
         m_abort = false;
     }

     RenderThread::~RenderThread()
     {
         mutex.lock();
         m_abort = true;
         mutex.unlock();

         wait();
     }

     void RenderThread::processImage(const QImage &image)
     {
         if (image.isNull())
             return;

         m_image = image;
         m_abort = false;
         start();
     }

     void RenderThread::run()
     {
         int size = qMax(m_image.width()/20, m_image.height()/20);
         for (int s = size; s > 0; --s) {
             for (int c = 0; c < 400; ++c) {
                 int x1 = qMax(0, (qrand() % m_image.width()) - s/2);
                 int x2 = qMin(x1 + s/2 + 1, m_image.width());
                 int y1 = qMax(0, (qrand() % m_image.height()) - s/2);
                 int y2 = qMin(y1 + s/2 + 1, m_image.height());
                 int n = 0;
                 int red = 0;
                 int green = 0;
                 int blue = 0;
                 for (int i = y1; i < y2; ++i) {
                     for (int j = x1; j < x2; ++j) {
                         QRgb pixel = m_image.pixel(j, i);
                         red += qRed(pixel);
                         green += qGreen(pixel);
                         blue += qBlue(pixel);
                         n += 1;
                     }
                 }
                 Block block(QRect(x1, y1, x2 - x1 + 1, y2 - y1 + 1),
                             QColor(red/n, green/n, blue/n));
                 emit sendBlock(block);
                 if (m_abort)
                     return;
                 msleep(10);
             }
         }
     }

     void RenderThread::stopProcess()
     {
         mutex.lock();
         m_abort = true;
         mutex.unlock();
     }