Maybe it would be good if you could fix your database problem first. I am sure that both problems are related. Post the debug log from the console, with the debug variable enabled, as described here:

https://www.digikam.org/contribute/

Maik

Adding the ''@'%' user to the database fixed the database problem - which strongly implies it isn't a database configuration issue since the error thrown to the console after setting 

 export QT_LOGGING_RULES="digikam*=true"

and then launching from the console

 digikam

yielded the error messages posted in bug  #435179 from digikam.  I apologize if it wasn't clear that I'd already set the error flag.  I can tee the error log to a file and attach it, the Qpixmap errors tend to almost instantly blow past the console buffer.

I'm about 91% complete rebuilding the thumbnails database, once that completes, I'll disable face detection and see if the QPixmap errors go away, which would seem likely to validate whether it is purely a face detection issue or some other module.

Why don't you post the log so we can get an overview of what's going wrong with you? If you don't want to make it public, send it to my email address.

Many users tested MySQL and digiKam-7.2.0 during the beta phase and had no problems like you did. I use MariaDB during development and have also tested it on Windows with Oracle MySQL. Smaller reported problems were fixed during the beta phase in conjunction with older MariaDB or MySQL servers. All without problems with a normal database and user configuration.

Maik

I'll disable the anon account and generate a file showing that fail.  I just captured one without and got 4,609 instances of "QPixmap::scaled: Pixmap is a null pixmap" so it will be at least easy to see.

Thanks!

I have only now found the log in my spam folder. Setting the debug rules only to digikam* would have been better. Could it be that you haven't installed the Breeze Icon Theme?

Maik

Thanks Malik,

I seem to:

breeze-icon-theme is already the newest version (4:5.68.0-0ubuntu1).

Also, it seems the database rebuild was successful - though I can't test quite yet until I get far enough along rebuilding the database that I can find a face I actually remember and haven't yet tagged.  

It is early to reach a conclusion but it seems "QPixmap::scaled: Pixmap is a null pixmap" is a different issue.  It isn't at all clear that the error has anything to do with creating "visual workflow" icons for face tags (still haven't seen those).

-David

Assigning face icons to face tags manually works fine, the automatic function still doesn't seem to happen, but my expectations may be wrong.

I'm still getting a lot of QPixmap errors but there doesn't seem to be any problem with digiKam.  

digikam.database: " ( ( (ImageTagProperties.tagid=? OR ImageTagProperties.tagid IN (SELECT id FROM TagsTree WHERE pid=?)) AND ImageTagProperties.property=?  ) OR ( (ImageTagProperties.tagid=? OR ImageTagProperties.tagid IN (SELECT id FROM TagsTree WHERE pid=?)) AND ImageTagProperties.property=?  ) OR ( (ImageTagProperties.tagid=? OR ImageTagProperties.tagid IN (SELECT id FROM TagsTree WHERE pid=?)) AND ImageTagProperties.property=?  ) OR ( (ImageTagProperties.tagid=? OR ImageTagProperties.tagid IN (SELECT id FROM TagsTree WHERE pid=?)) AND ImageTagProperties.property=?  ) ) "
digikam.database: Search query:
 "SELECT DISTINCT Images.id, Images.name, Images.album,        Albums.albumRoot,        ImageInformation.rating, Images.category,        ImageInformation.format, ImageInformation.creationDate,        Images.modificationDate, Images.fileSize,        ImageInformation.width,  ImageInformation.height,        ImageTagProperties.value, ImageTagProperties.property, ImageTagProperties.tagid  FROM Images        INNER JOIN ImageTagProperties ON ImageTagProperties.imageid=Images.id        LEFT JOIN ImageInformation ON Images.id=ImageInformation.imageid        INNER JOIN Albums           ON Albums.id=Images.album WHERE Images.status=1 AND (  ( ( (ImageTagProperties.tagid=? OR ImageTagProperties.tagid IN (SELECT id FROM TagsTree WHERE pid=?)) AND ImageTagProperties.property=?  ) OR ( (ImageTagProperties.tagid=? OR ImageTagProperties.tagid IN (SELECT id FROM TagsTree WHERE pid=?)) AND ImageTagProperties.property=?  ) OR ( (ImageTagProperties.tagid=? OR ImageTagProperties.tagid IN (SELECT id FROM TagsTree WHERE pid=?)) AND ImageTagProperties.property=?  ) OR ( (ImageTagProperties.tagid=? OR ImageTagProperties.tagid IN (SELECT id FROM TagsTree WHERE pid=?)) AND ImageTagProperties.property=?  ) )  );" 
 (QVariant(int, 835), QVariant(int, 835), QVariant(QString, "autodetectedPerson"), QVariant(int, 835), QVariant(int, 835), QVariant(QString, "autodetectedFace"), QVariant(int, 835), QVariant(int, 835), QVariant(QString, "ignoredFace"), QVariant(int, 835), QVariant(int, 835), QVariant(QString, "tagRegion"))
QPixmap::scaled: Pixmap is a null pixmap
QPixmap::scaled: Pixmap is a null pixmap
QPixmap::scaled: Pixmap is a null pixmap
QPixmap::scaled: Pixmap is a null pixmap
QPixmap::scaled: Pixmap is a null pixmap
QPixmap::scaled: Pixmap is a null pixmap
QPixmap::scaled: Pixmap is a null pixmap
digikam.geoiface: ----
digikam.database: Search result: 23
digikam.general: Cancel Main Thread
digikam.general: One job is done
digikam.general: Cancel Main Thread
digikam.general: One job is done
digikam.general: Cancel Main Thread
QPixmap::scaled: Pixmap is a null pixmap
QPixmap::scaled: Pixmap is a null pixmap
QPixmap::scaled: Pixmap is a null pixmap
QPixmap::scaled: Pixmap is a null pixmap
QPixmap::scaled: Pixmap is a null pixmap
QPixmap::scaled: Pixmap is a null pixmap
QPixmap::scaled: Pixmap is a null pixmap

QPixmap is used to show something is GUI. It will never be used to store thumbnails in database, as we use QImage object instead, which do not depend of video screen.

I suspect something about to show a preview in progress bar. I implemented this feature in the past, but for performance reason i dropped this code. Perhaps it still something active in source code which give a warning from Qt library but not introduce a side effect.

Gilles Caulier

I think it is "ignore" then - at least until there's an update which might have different behavior, then I'm happy to check and see if it is resolved for me.

We hardly have any QPixmap::scaled calls in digiKam. I looked at all of them again. Actually only the tag icons come into question. So it would have to be Breeze Icons that don't exist. You see a smile icon ((:-)) for face tags in the tree?

I cannot say for sure that the smiley icon already exists in Breeze-5.68.

Maik

I don't see a smile icon, but I'm not sure where to look.  Happy to attach some screen shots if that would help.

Looking at Synaptic, I have installed:
Breeze                  4:5.18.4.1-0ubuntu1
breeze-cursor-theme     4:5.18.4.1-0ubuntu1
breeze-gtk-theme        5.18.4.1-0ubuntu1
breeze-icon-theme       4:5.68.0-0ubuntu1

I do not have installed
breeze-dev
breeze-icon-theme-rcc

I'll install the latter and see if that helps.

Git commit 54e075d5ef6de6b08ca6e9404b1d9aff7dbdc512 by Maik Qualmann.
Committed on 04/04/2021 at 08:22.
Pushed by mqualmann into branch 'master'.

replace missing Breeze icons with a fallback icon
FIXED-IN: 7.3.0

M  +2    -3    NEWS
M  +6    -3    core/libs/album/engine/albumthumbnailloader.cpp

https://invent.kde.org/graphics/digikam/commit/54e075d5ef6de6b08ca6e9404b1d9aff7dbdc512

Cool - I'll recompile when 7.3 releases. 

breeze-icon-theme-rcc didn't solve it - but it does not seem to cause any functional issues.