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50 | |
51 | |
52 | #include <qqmlextensionplugin.h> |
53 | |
54 | #include <qqmlengine.h> |
55 | #include <qquickimageprovider.h> |
56 | #include <QDebug> |
57 | #include <QImage> |
58 | #include <QThreadPool> |
59 | |
60 | class AsyncImageResponseRunnable : public QObject, public QRunnable |
61 | { |
62 | Q_OBJECT |
63 | |
64 | signals: |
65 | void done(QImage image); |
66 | |
67 | public: |
68 | AsyncImageResponseRunnable(const QString &id, const QSize &requestedSize) |
69 | : m_id(id), m_requestedSize(requestedSize) {} |
70 | |
71 | void run() override |
72 | { |
73 | auto image = QImage(50, 50, QImage::Format_RGB32); |
74 | if (m_id == QLatin1String("slow" )) { |
75 | qDebug() << "Slow, red, sleeping for 5 seconds" ; |
76 | QThread::sleep(5); |
77 | image.fill(color: Qt::red); |
78 | } else { |
79 | qDebug() << "Fast, blue, sleeping for 1 second" ; |
80 | QThread::sleep(1); |
81 | image.fill(color: Qt::blue); |
82 | } |
83 | if (m_requestedSize.isValid()) |
84 | image = image.scaled(s: m_requestedSize); |
85 | |
86 | emit done(image); |
87 | } |
88 | |
89 | private: |
90 | QString m_id; |
91 | QSize m_requestedSize; |
92 | }; |
93 | |
94 | class AsyncImageResponse : public QQuickImageResponse |
95 | { |
96 | public: |
97 | AsyncImageResponse(const QString &id, const QSize &requestedSize, QThreadPool *pool) |
98 | { |
99 | auto runnable = new AsyncImageResponseRunnable(id, requestedSize); |
100 | connect(sender: runnable, signal: &AsyncImageResponseRunnable::done, receiver: this, slot: &AsyncImageResponse::handleDone); |
101 | pool->start(runnable); |
102 | } |
103 | |
104 | void handleDone(QImage image) { |
105 | m_image = image; |
106 | emit finished(); |
107 | } |
108 | |
109 | QQuickTextureFactory *textureFactory() const override |
110 | { |
111 | return QQuickTextureFactory::textureFactoryForImage(image: m_image); |
112 | } |
113 | |
114 | QImage m_image; |
115 | }; |
116 | |
117 | class AsyncImageProvider : public QQuickAsyncImageProvider |
118 | { |
119 | public: |
120 | QQuickImageResponse *requestImageResponse(const QString &id, const QSize &requestedSize) override |
121 | { |
122 | AsyncImageResponse *response = new AsyncImageResponse(id, requestedSize, &pool); |
123 | return response; |
124 | } |
125 | |
126 | private: |
127 | QThreadPool pool; |
128 | }; |
129 | |
130 | |
131 | class ImageProviderExtensionPlugin : public QQmlEngineExtensionPlugin |
132 | { |
133 | Q_OBJECT |
134 | Q_PLUGIN_METADATA(IID QQmlEngineExtensionInterface_iid) |
135 | public: |
136 | void initializeEngine(QQmlEngine *engine, const char *uri) override |
137 | { |
138 | Q_UNUSED(uri); |
139 | engine->addImageProvider(id: "async" , new AsyncImageProvider); |
140 | } |
141 | |
142 | }; |
143 | |
144 | #include "imageresponseprovider.moc" |
145 | |