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Dive pictures: Move thumbnail-size to Thumbnailer class

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The size of the to-be-created thumbnails was passed from DivePictureModel
to Thumbnailer. This became more and more bothersome, because the size
had to be stored with the request. Calling from Thumbnailer into
DivePictureModel was not an option, since this is not linked to all tests.
Therefore, move these functions to the Thumbnailer class.

Since the maximum thumbnail size is now known to the thumbnailer, the
dummy and failure images can be precalculated, which makes switching
between dives faster.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2018-03-11 10:19:08 +01:00 • committed by Dirk Hohndel
parent afe20ce029
commit b450c155fd
4 changed files with 43 additions and 23 deletions
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9
core/imagedownloader.h
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@ -28,18 +28,23 @@ public:
// Schedule a thumbnail for fetching or calculation.
// Returns a placehlder thumbnail. The actual thumbnail will be sent
// via a signal later.
QImage fetchThumbnail(PictureEntry &entry, int size);
QImage fetchThumbnail(PictureEntry &entry);
// If we change dive, clear all unfinished thumbnail creations
void clearWorkQueue();
static int maxThumbnailSize();
static int defaultThumbnailSize();
static int thumbnailSize(double zoomLevel);
signals:
void thumbnailChanged(QString filename, QImage thumbnail);
private:
Thumbnailer();
void processItem(QString filename, int size);
void processItem(QString filename);
mutable QMutex lock;
QThreadPool pool;
QImage failImage; // Shown when image-fetching fails
QImage dummyImage; // Shown before thumbnail is fetched
QMap<QString,QFuture<void>> workingOn;
};