The recently committed refactoring of the dive-picture code introduced
a severe bug:
If an image couldn't be loaded from disk owing to an invalid file, the
filename was interpreted as an url and loaded in the background. This
succeeded, because the file actually exists. After download, the file
would then still be invalid and the whole thing restarted, leading to
an infinity loop.
To fix this, do two things:
1) Don't even try to download local files.
2) If interpreting a downloaded file fails, don't try the downloading
business again.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
Instead of generating one ImageDownloader object per image to be
downloaded and running every image download in a separate worker
thread, use one global ImageDownloader object owned by the UI thread.
The images are downloaded using event based IO (as probably was the
intention of the QNetworkManager class).
User-visible change: after download from the internet, the thumbnail
is shown without having to change dives.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
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>
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>
In imagedownloader.cpp the only thing we need from the picture struct
is the filename. Therefore, use QStrings instead of the picture struct.
This simplifies memory management.
Remove the clone_picture() function, which is not needed anymore.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
SHashedImage was a subclass of QImage, which fetched the image according
to the filename hashes. Turn this into a function, as this is much more
idiomatic and flexible.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
Remove a semicolon after Q_OBJECT and a few others after the closing
braces of while loops.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
If loading from hash failed in the saveImage() slot(!) it would
recurse into loadFromUrl(), which would generate a new network
reply. Very scary and a (small) wonder that it worked.
Let's try to make this all more explicit.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
The QNetworkAccessManager is only used in the load() function. No
point in it being a subobject.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
In core/imagedownloader.cpp the helpers cloudImageUrl() and loadPicture()
are made of static linkage.
The global variables queuedPictures and pictureQueueMutex were moved
into the loadPicture() function, because they are used only there.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
Having subsurface-core as a directory name really messes with
autocomplete and is obviously redundant. Simmilarly, qt-mobile caused an
autocomplete conflict and also was inconsistent with the desktop-widget
name for the directory containing the "other" UI.
And while cleaning up the resulting change in the path name for include
files, I decided to clean up those even more to make them consistent
overall.
This could have been handled in more commits, but since this requires a
make clean before the build, it seemed more sensible to do it all in one.
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
2016-04-04 22:33:58 -07:00
Renamed from subsurface-core/imagedownloader.h (Browse further)
