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3967b1fd4d
Create a new class, which performs all thumbnailing code. This is mostly code reshuffling. Thumbnails are extracted either from a cache or thumbnail calculation is started in a worker thread. Since getHashedImage() is called from a worker thread it makes no sense to call subfunctions in yet another worker thread. Remove these calls. In contrast to the previous code, on error the background thread produces a failure image, but it is not yet shown. Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
49 lines
1.1 KiB
C++
49 lines
1.1 KiB
C++
// SPDX-License-Identifier: GPL-2.0
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#ifndef IMAGEDOWNLOADER_H
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#define IMAGEDOWNLOADER_H
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#include <QImage>
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#include <QFuture>
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#include <QNetworkReply>
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#include <QThreadPool>
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class ImageDownloader : public QObject {
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Q_OBJECT
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public:
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ImageDownloader(const QString &filename);
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void load(bool fromHash);
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private:
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bool loadFromUrl(const QUrl &); // return true on success
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void saveImage(QNetworkReply *reply, bool &success);
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QString filename;
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};
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class PictureEntry;
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class Thumbnailer : public QObject {
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Q_OBJECT
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public:
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static Thumbnailer *instance();
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// Schedule a thumbnail for fetching or calculation.
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// Returns a placehlder thumbnail. The actual thumbnail will be sent
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// via a signal later.
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QImage fetchThumbnail(PictureEntry &entry, int size);
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// If we change dive, clear all unfinished thumbnail creations
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void clearWorkQueue();
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signals:
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void thumbnailChanged(QString filename, QImage thumbnail);
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private:
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Thumbnailer();
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void processItem(QString filename, int size);
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mutable QMutex lock;
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QThreadPool pool;
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QMap<QString,QFuture<void>> workingOn;
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};
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QImage getHashedImage(const QString &filename);
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#endif // IMAGEDOWNLOADER_H
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