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8a8063c1cd
The thumbnails were fetched in the background to achieve a snappier UI. The problem with that is that on LaTeX etc. export only placeholder thumbnails were shown. Therefore, implement a synchronous mode. This only tries to fetch cached thumbnails or calculate thumbnails for images. Videos and remote files are not supported. Fixes #1963 Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
91 lines
3.4 KiB
C++
91 lines
3.4 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 "metadata.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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static ImageDownloader *instance();
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ImageDownloader();
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public slots:
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void load(QUrl url, QString filename);
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signals:
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void loaded(QString filename);
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void failed(QString filename);
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private:
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QNetworkAccessManager manager;
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void loadFromUrl(const QString &filename, const QUrl &);
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void saveImage(QNetworkReply *reply);
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};
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struct 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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// If synchronous is false, returns a placeholder thumbnail.
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// The actual thumbnail will be sent via a signal later.
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// If synchronous is true, try to fetch the actual thumbnail.
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// In this mode only precalculated thumbnails or thumbnails
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// from pictures are returned. Video extraction and remote
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// images are not supported.
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QImage fetchThumbnail(const QString &filename, bool synchronous);
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// Schedule multiple thumbnails for forced recalculation
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void calculateThumbnails(const QVector<QString> &filenames);
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// If we change dive, clear all unfinished thumbnail creations
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void clearWorkQueue();
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static int maxThumbnailSize();
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static int defaultThumbnailSize();
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static int thumbnailSize(double zoomLevel);
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public slots:
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void imageDownloaded(QString filename);
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void imageDownloadFailed(QString filename);
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void frameExtracted(QString filename, QImage thumbnail, duration_t duration, duration_t offset);
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void frameExtractionFailed(QString filename, duration_t duration);
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void frameExtractionInvalid(QString filename, duration_t duration);
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signals:
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void thumbnailChanged(QString filename, QImage thumbnail, duration_t duration);
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private:
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struct Thumbnail {
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QImage img;
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mediatype_t type;
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duration_t duration;
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};
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Thumbnailer();
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Thumbnail fetchVideoThumbnail(const QString &filename, const QString &originalFilename, duration_t duration);
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Thumbnail extractVideoThumbnail(const QString &picture_filename, duration_t duration);
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Thumbnail addPictureThumbnailToCache(const QString &picture_filename, const QImage &thumbnail);
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Thumbnail addVideoThumbnailToCache(const QString &picture_filename, duration_t duration, const QImage &thumbnail, duration_t position);
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Thumbnail addUnknownThumbnailToCache(const QString &picture_filename);
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void recalculate(QString filename);
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void processItem(QString filename, bool tryDownload);
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Thumbnail getThumbnailFromCache(const QString &picture_filename);
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Thumbnail getPictureThumbnailFromStream(QDataStream &stream);
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Thumbnail getVideoThumbnailFromStream(QDataStream &stream, const QString &filename);
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Thumbnail fetchImage(const QString &filename, const QString &originalFilename, bool tryDownload);
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Thumbnail getHashedImage(const QString &filename, bool tryDownload);
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void markVideoThumbnail(QImage &img);
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mutable QMutex lock;
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QThreadPool pool;
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QImage failImage; // Shown when image-fetching fails
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QImage dummyImage; // Shown before thumbnail is fetched
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QImage videoImage; // Place holder for videos
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QImage videoOverlayImage; // Overlay for video thumbnails
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QImage unknownImage; // Place holder for files where we couldn't determine the type
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QMap<QString,QFuture<void>> workingOn;
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};
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#endif // IMAGEDOWNLOADER_H
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