Bug 507688 - Regression: Broken rendering at high zoom levels of particular pdf document
Summary: Regression: Broken rendering at high zoom levels of particular pdf document
Status: REPORTED
Alias: None
Product: okular
Classification: Applications
Component: PDF backend (other bugs)
Version First Reported In: 25.04.3
Platform: Other Linux
: NOR normal
Target Milestone: ---
Assignee: Okular developers
URL:
Keywords: regression
Depends on:
Blocks:
 
Reported: 2025-07-31 10:08 UTC by Jan Rathmann
Modified: 2025-07-31 10:08 UTC (History)
0 users

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:


Attachments
Screenshot of broken rendering in affected document (427.46 KB, image/png)
2025-07-31 10:08 UTC, Jan Rathmann
Details

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Description Jan Rathmann 2025-07-31 10:08:02 UTC
SUMMARY
The rendering of a particular pdf file is broken when using higher zoom levels (> 150%?).

STEPS TO REPRODUCE
1. Open the following pdf file in Okular:
https://www.nvv.de/fileadmin/nvv/data/2._Fahrtinfo/4._Liniennetz/Liniennetz_KasselPlus_Schematisch.pdf 
2. Set Zoom level to 200%, or zoom in by mouse wheel etc.

OBSERVED RESULT
The rendering looks broken when zoomed in, see attached screenshot.

EXPECTED RESULT
The rendering looks fine at all zoom levels.

ADDITIONAL INFORMATION
This seems to be a regression that happened after Okular 24.12.3 release.

I can reproduce it with:
* Kubuntu 25.04 + Backports-PPA, Okular 25.04.3, Poppler 0.6.5, Frameworks 6.14.0, Qt 6.8.3
* Fedora Rawhide live image 20250725, Okular 25.07.80, Poppler 0.6.5, Frameworks 6.16.0, Qt 6.9.1
* Neon Unstable live image 20250727, Okular 25.11.70, Poppler 0.6.5, Frameworks 6.17.0, Qt 6.9.1
* Neon User live image 20250727, Okular 25.04.3, Popper 0.6.5, Frameworks 6.16.0, Qt 6.9.1

I could _not_ reproduce it with:
* Kubuntu 25.04 live image, Okular 24.12.3, Poppler 0.6.5, Frameworks 6.12.0, Qt 6.8.3
* Fedora 42 live image, Okular 24.12.3, Poppler 0.6.5, Frameworks 6.12.0, Qt 6.8.2
Comment 1 Jan Rathmann 2025-07-31 10:08:48 UTC
Created attachment 183674 [details]
Screenshot of broken rendering in affected document