83 lines
3.3 KiB
C++
83 lines
3.3 KiB
C++
|
/****************************************************************************
|
||
|
|
**
|
||
|
|
** Copyright (C) 2016 The Qt Company Ltd.
|
||
|
|
** Contact: https://www.qt.io/licensing/
|
||
|
|
**
|
||
|
|
** This file is part of the examples of the Qt Toolkit.
|
||
|
|
**
|
||
|
|
** $QT_BEGIN_LICENSE:BSD$
|
||
|
|
** Commercial License Usage
|
||
|
|
** Licensees holding valid commercial Qt licenses may use this file in
|
||
|
|
** accordance with the commercial license agreement provided with the
|
||
|
|
** Software or, alternatively, in accordance with the terms contained in
|
||
|
|
** a written agreement between you and The Qt Company. For licensing terms
|
||
|
|
** and conditions see https://www.qt.io/terms-conditions. For further
|
||
|
|
** information use the contact form at https://www.qt.io/contact-us.
|
||
|
|
**
|
||
|
|
** BSD License Usage
|
||
|
|
** Alternatively, 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 The Qt Company Ltd 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 <QImage>
|
||
|
|
#include <QList>
|
||
|
|
#include <QThread>
|
||
|
|
#include <QDebug>
|
||
|
|
#include <QGuiApplication>
|
||
|
|
#include <qtconcurrentmap.h>
|
||
|
|
|
||
|
|
#include <functional>
|
||
|
|
|
||
|
|
int main(int argc, char *argv[])
|
||
|
|
{
|
||
|
|
QGuiApplication 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));
|
||
|
|
|
||
|
|
std::function<QImage(const QImage&)> scale = [](const QImage &image) -> QImage
|
||
|
|
{
|
||
|
|
qDebug() << "Scaling image in thread" << QThread::currentThread();
|
||
|
|
return image.scaled(QSize(100, 100), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
|
||
|
|
};
|
||
|
|
|
||
|
|
// Use QtConcurrentBlocking::mapped to apply the scale function to all the
|
||
|
|
// images in the list.
|
||
|
|
QList<QImage> thumbnails = QtConcurrent::blockingMapped(images, scale);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|