Bug 456225 - Rescaling of text is ugly when zooming in or out
Summary: Rescaling of text is ugly when zooming in or out
Status: REPORTED
Alias: None
Product: okular
Classification: Applications
Component: general (show other bugs)
Version: 22.04.2
Platform: Manjaro Linux
: NOR wishlist
Target Milestone: ---
Assignee: Okular developers
URL:
Keywords:
: 473470 (view as bug list)
Depends on:
Blocks:
 
Reported: 2022-07-02 00:19 UTC by jan.claussen10
Modified: 2024-04-22 14:27 UTC (History)
4 users (show)

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Description jan.claussen10 2022-07-02 00:19:16 UTC 
SUMMARY
Text is kind of wobbly when zooming in our out. Some lines disappear and reappear. It is just not very pleasant to look at. With the rise of Plasma mobile these touch gesture issues should get fixed at some point


STEPS TO REPRODUCE
1. Zoom in or out slowly
2. Observer the text

OBSERVED RESULT
Text is wobbly and ugly while zooming

SOFTWARE/OS VERSIONS
KDE Plasma Version: 5.24.5
KDE Frameworks Version: 5.95.0
Qt Version: 5.15.5

ADDITIONAL INFORMATION
Comment 1 Nate Graham 2022-07-05 16:35:47 UTC 
What method are you using to zoom that makes this issue visible? A pinch gesture on your touchscreen?
Comment 2 jan.claussen10 2022-12-10 11:48:14 UTC 
Sorry, have not read the mail I guess. It occurs in both situations. When zooming with a pinch gesture, it occurs much more though.
Comment 3 Thomas Bertels 2024-04-11 12:11:38 UTC 
The problem is that Okular doesn't use any interpolation while zooming in or out. When the zooming is done, the text then gets re-rendered.
This can be easily reproduced by zooming in or out using Ctrl+mouse wheel.

Lanczos 3 or 4  should be used when zooming in or out.
An option could be added to select bilinear for slower computers.
Comment 4 Thomas Bertels 2024-04-11 12:12:12 UTC 
*** Bug 473470 has been marked as a duplicate of this bug. ***
Comment 5 Albert Astals Cid 2024-04-22 14:27:49 UTC 
This is not a bug, obviously the text needs to be re-rendered when zooming in or out