145 lines
4.8 KiB
C++
145 lines
4.8 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 Canonical Limited and/or its subsidiary(-ies)
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the demonstration applications of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <qqmlextensionplugin.h>
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#include <qqmlengine.h>
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#include <qquickimageprovider.h>
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#include <QDebug>
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#include <QImage>
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#include <QThreadPool>
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class AsyncImageResponseRunnable : public QObject, public QRunnable
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{
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Q_OBJECT
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signals:
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void done(QImage image);
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public:
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AsyncImageResponseRunnable(const QString &id, const QSize &requestedSize)
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: m_id(id), m_requestedSize(requestedSize) {}
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void run() override
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{
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auto image = QImage(50, 50, QImage::Format_RGB32);
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if (m_id == QLatin1String("slow")) {
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qDebug() << "Slow, red, sleeping for 5 seconds";
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QThread::sleep(5);
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image.fill(Qt::red);
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} else {
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qDebug() << "Fast, blue, sleeping for 1 second";
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QThread::sleep(1);
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image.fill(Qt::blue);
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}
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if (m_requestedSize.isValid())
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image = image.scaled(m_requestedSize);
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emit done(image);
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}
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private:
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QString m_id;
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QSize m_requestedSize;
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};
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class AsyncImageResponse : public QQuickImageResponse
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{
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public:
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AsyncImageResponse(const QString &id, const QSize &requestedSize, QThreadPool *pool)
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{
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auto runnable = new AsyncImageResponseRunnable(id, requestedSize);
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connect(runnable, &AsyncImageResponseRunnable::done, this, &AsyncImageResponse::handleDone);
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pool->start(runnable);
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}
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void handleDone(QImage image) {
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m_image = image;
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emit finished();
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}
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QQuickTextureFactory *textureFactory() const override
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{
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return QQuickTextureFactory::textureFactoryForImage(m_image);
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}
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QImage m_image;
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};
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class AsyncImageProvider : public QQuickAsyncImageProvider
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{
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public:
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QQuickImageResponse *requestImageResponse(const QString &id, const QSize &requestedSize) override
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{
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AsyncImageResponse *response = new AsyncImageResponse(id, requestedSize, &pool);
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return response;
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}
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private:
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QThreadPool pool;
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};
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class ImageProviderExtensionPlugin : public QQmlEngineExtensionPlugin
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{
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Q_OBJECT
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Q_PLUGIN_METADATA(IID QQmlEngineExtensionInterface_iid)
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public:
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void initializeEngine(QQmlEngine *engine, const char *uri) override
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{
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Q_UNUSED(uri);
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engine->addImageProvider("async", new AsyncImageProvider);
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}
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};
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#include "imageresponseprovider.moc"
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