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Tasklist

FS#78289 - [calibre] shows epub text in a jaggy font

Attached to Project: Community Packages
Opened by Munzir Taha (munzirtaha) - Saturday, 22 April 2023, 20:09 GMT
Last edited by Toolybird (Toolybird) - Monday, 05 June 2023, 21:33 GMT
Task Type Bug Report
Category Packages
Status Closed
Assigned To No-one
Architecture All
Severity Low
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

Description:
After latest update, when I open any epub file, the text looks as if there is no anti-aliasing enabled. I installed calibre from flatpak and it doesn't show this problem, so I guess it's a packaging issue.

Additional info:
* Version : 6.16.0-1
This task depends upon

Closed by  Toolybird (Toolybird)
Monday, 05 June 2023, 21:33 GMT
Reason for closing:  Not a bug
Additional comments about closing:  If anything, it's an upstream issue and not an Arch packaging bug.
Comment by Toolybird (Toolybird) - Saturday, 22 April 2023, 22:48 GMT
Not enough context provided. Desktop env? Wayland?
Comment by Munzir Taha (munzirtaha) - Tuesday, 25 April 2023, 00:34 GMT
Operating System: Arch Linux
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.105.0
Qt Version: 5.15.9
Kernel Version: 6.2.12-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 9 6900HX with Radeon Graphics
Memory: 30.5 GiB of RAM
Graphics Processor: AMD Radeon Graphics
   calibre-flatpak-smooth.png (283.9 KiB)
   calibre-jaggy.png (227.9 KiB)
Comment by Munzir Taha (munzirtaha) - Tuesday, 25 April 2023, 00:56 GMT
I've just found a workaround. Changing the scale of my "Display Configuration" from 150% to 100% in KDE systemsettings, fixes the issue for me. Though with my screen resolution of 2560x1600, 150% would look much better. Since the upstream program doesn't show this in the flatpak version, I think this is a packaging issue, am I wrong?
Comment by Toolybird (Toolybird) - Wednesday, 26 April 2023, 06:58 GMT
> I installed calibre from flatpak and it doesn't show this problem, so I guess it's a packaging issue.

Not necessarily. The flatpak might simply be using different libs/versions than what Arch is using. Anyway, I tried to repro in a fresh Plasma VM and the 2 latest calibre versions both look like crap at 150% for me when qt6-wayland is installed i.e. remove qt6-wayland and it all looks fine. Probably some kind of weird qt6 related wayland glitch. Summoning @arojas for an opinion.
Comment by Munzir Taha (munzirtaha) - Saturday, 06 May 2023, 18:41 GMT
Instead of removing qt6-wayland, we can also use QT_QPA_PLATFORM=xcb calibre to launch it in X11 Window mode
Comment by Toolybird (Toolybird) - Sunday, 07 May 2023, 22:25 GMT
You might want to have a look at [1] for some env vars to play with. In fact, the whole page looks relevant to your issue. Pls also see [2] (it's for qt5 but possibly still applicable).

[1] https://doc.qt.io/qt-6/highdpi.html#environment-variable-reference
[2] https://wiki.archlinux.org/title/HiDPI#Qt_5

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