ab9f4d5db6
I updated signals and slots and for each loops to the new syntax and replaced most free functions with std::function. Task-number: QTBUG-60641 Change-Id: I7693f81f71c7f53fcbe83189a0de2fb76ddf99a8 Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
83 lines
3.3 KiB
C++
83 lines
3.3 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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** This file is part of the examples of the Qt Toolkit.
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** BSD License Usage
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** "Redistribution and use in source and binary forms, with or without
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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**
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****************************************************************************/
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#include <QImage>
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#include <QList>
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#include <QThread>
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#include <QDebug>
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#include <QGuiApplication>
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#include <qtconcurrentmap.h>
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#include <functional>
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int main(int argc, char *argv[])
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{
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QGuiApplication app(argc, argv);
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const int imageCount = 20;
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// Create a list containing imageCount images.
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QList<QImage> images;
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for (int i = 0; i < imageCount; ++i)
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images.append(QImage(1600, 1200, QImage::Format_ARGB32_Premultiplied));
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std::function<QImage(const QImage&)> scale = [](const QImage &image) -> QImage
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{
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qDebug() << "Scaling image in thread" << QThread::currentThread();
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return image.scaled(QSize(100, 100), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
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};
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// Use QtConcurrentBlocking::mapped to apply the scale function to all the
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// images in the list.
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QList<QImage> thumbnails = QtConcurrent::blockingMapped(images, scale);
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return 0;
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}
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