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path: root/examples/quick/imageresponseprovider/imageresponseprovider.cpp
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/****************************************************************************
**
** Copyright (C) 2015 Canonical Limited and/or its subsidiary(-ies)
** Contact: http://www.qt.io/licensing/
**
** This file is part of the demonstration applications 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 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 <qqmlextensionplugin.h>

#include <qqmlengine.h>
#include <qquickimageprovider.h>
#include <QDebug>
#include <QImage>
#include <QThreadPool>

class AsyncImageResponse : public QQuickImageResponse, public QRunnable
{
    public:
        AsyncImageResponse(const QString &id, const QSize &requestedSize)
         : m_id(id), m_requestedSize(requestedSize), m_texture(0)
        {
            setAutoDelete(false);
        }

        QQuickTextureFactory *textureFactory() const
        {
            return m_texture;
        }

        void run()
        {
            QImage image(50, 50, QImage::Format_RGB32);
            if (m_id == "slow") {
                qDebug() << "Slow, red, sleeping for 5 seconds";
                QThread::sleep(5);
                image.fill(Qt::red);
            } else {
                qDebug() << "Fast, blue, sleeping for 1 second";
                QThread::sleep(1);
                image.fill(Qt::blue);
            }
            if (m_requestedSize.isValid())
                image = image.scaled(m_requestedSize);
            m_texture = QQuickTextureFactory::textureFactoryForImage(image);
            emit finished();
        }

        QString m_id;
        QSize m_requestedSize;
        QQuickTextureFactory *m_texture;
};

class AsyncImageProvider : public QQuickAsyncImageProvider
{
public:
    QQuickImageResponse *requestImageResponse(const QString &id, const QSize &requestedSize)
    {
        AsyncImageResponse *response = new AsyncImageResponse(id, requestedSize);
        pool.start(response);
        return response;
    }

private:
    QThreadPool pool;
};


class ImageProviderExtensionPlugin : public QQmlExtensionPlugin
{
    Q_OBJECT
    Q_PLUGIN_METADATA(IID QQmlExtensionInterface_iid)
public:
    void registerTypes(const char *uri)
    {
        Q_UNUSED(uri);
    }

    void initializeEngine(QQmlEngine *engine, const char *uri)
    {
        Q_UNUSED(uri);
        engine->addImageProvider("async", new AsyncImageProvider);
    }

};

#include "imageresponseprovider.moc"