Home · All Namespaces · All Classes · Main Classes · Grouped Classes · Modules · Functions

main.cpp Example File
qtconcurrent/map/main.cpp

 /****************************************************************************
 **
 ** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
 ** Contact: Qt Software Information ([email protected])
 **
 ** This file is part of the example classes of the Qt Toolkit.
 **
 ** Commercial Usage
 ** Licensees holding valid Qt Commercial licenses may use this file in
 ** accordance with the Qt Commercial License Agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and Nokia.
 **
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU
 ** General Public License versions 2.0 or 3.0 as published by the Free
 ** Software Foundation and appearing in the file LICENSE.GPL included in
 ** the packaging of this file.  Please review the following information
 ** to ensure GNU General Public Licensing requirements will be met:
 ** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
 ** http://www.gnu.org/copyleft/gpl.html.  In addition, as a special
 ** exception, Nokia gives you certain additional rights. These rights
 ** are described in the Nokia Qt GPL Exception version 1.3, included in
 ** the file GPL_EXCEPTION.txt in this package.
 **
 ** Qt for Windows(R) Licensees
 ** As a special exception, Nokia, as the sole copyright holder for Qt
 ** Designer, grants users of the Qt/Eclipse Integration plug-in the
 ** right for the Qt/Eclipse Integration to link to functionality
 ** provided by Qt Designer and its related libraries.
 **
 ** If you are unsure which license is appropriate for your use, please
 ** contact the sales department at [email protected].
 **
 ****************************************************************************/

 #include <QImage>
 #include <QList>
 #include <QThread>
 #include <QDebug>
 #include <QApplication>
 #include <qtconcurrentmap.h>

 #ifndef QT_NO_CONCURRENT

 QImage scale(const QImage &image)
 {
     qDebug() << "Scaling image in thread" << QThread::currentThread();
     return image.scaled(QSize(100, 100), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
 }

 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);

     const int imageCount = 20;

     // Create a list containing imageCount images.
     QList<QImage> images;
     for (int i = 0; i < imageCount; ++i)
         images.append(QImage(1600, 1200, QImage::Format_ARGB32_Premultiplied));

     // Use QtConcurrentBlocking::mapped to apply the scale function to all the
     // images in the list.
     QList<QImage> thumbnails = QtConcurrent::blockingMapped(images, scale);

     return 0;
 }

 #else

 int main()
 {
         qDebug() << "Qt Concurrent is not yet supported on this platform";
 }

 #endif


Copyright © 2008 Nokia Trademarks
Qt 4.4.3