98 lines
2.5 KiB
C++
98 lines
2.5 KiB
C++
// Copyright (C) 2015 Canonical Limited and/or its subsidiary(-ies)
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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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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