Bug 152422 - Inter-glyph jitter when underlining text with Skia rendering
Summary: Inter-glyph jitter when underlining text with Skia rendering
Status: NEW
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Writer (show other bugs)
Version:
(earliest affected)
7.5.0.0 alpha1+
Hardware: All All
: medium normal
Assignee: Not Assigned
URL:
Whiteboard:
Keywords:
: 151327 (view as bug list)
Depends on:
Blocks: Skia
  Show dependency treegraph
 
Reported: 2022-12-08 14:02 UTC by Telesto
Modified: 2025-07-24 03:10 UTC (History)
4 users (show)

See Also:
Crash report or crash signature:


Attachments
Screencast (1.01 MB, video/mp4)
2022-12-08 15:26 UTC, Telesto
Details
Screencast 2 (20.29 MB, video/mp4)
2022-12-08 22:04 UTC, m_a_riosv
Details

Note You need to log in before you can comment on or make changes to this bug.
Description Telesto 2022-12-08 14:02:03 UTC
Description:
Inter-glyph jitter when underlining text with Skia rendering

Steps to Reproduce:
1. Open Writer
2. Insert Lorem Ipsum: Tools -> Auto-Text -> Lorem Ipsum
3. Zoom at say 220%
4. Select 'ipsum' (second word, first line)
5. CTRL+U. Notice a shift (press CTRL+Z/CTRL+U combo to make it dance). Movement can be seen at: dolor and sit (next to the underlined ipsum)

Follow-up on bug 146830, which solves the inter-glyph rendering other backends 

Actual Results:
Inter-glyph jitter

Expected Results:
Stable rendering like GDI


Reproducible: Always


User Profile Reset: No

Additional Info:
Version: 7.5.0.0.alpha1+ (X86_64) / LibreOffice Community
Build ID: c50cf1883af26daebdfc9d796ced3c20c222f43b
CPU threads: 4; OS: Windows 6.3 Build 9600; UI render: Skia/Raster; VCL: win
Locale: nl-NL (nl_NL); UI: en-US
Calc: CL threaded
Comment 1 Telesto 2022-12-08 14:03:36 UTC
Confirmed at bug 152094 comment 20. Setting to NEW

Note: it's a follow-up on bug 152094, not bug 146830
Comment 2 m_a_riosv 2022-12-08 14:58:37 UTC
I can't reproduce.
Version: 7.5.0.0.alpha1+ (X86_64) / LibreOffice Community
Build ID: 52c75986adc2b370eb55ce918ab1db0a95831c83
CPU threads: 4; OS: Windows 10.0 Build 19045; UI render: Skia/Raster; VCL: win
Locale: en-US (es_ES); UI: en-US Calc: CL threaded
BTW win 8.1 it's EOL on the next month.
Comment 3 Telesto 2022-12-08 15:26:16 UTC
Created attachment 184050 [details]
Screencast

Version: 7.5.0.0.alpha1+ (X86_64) / LibreOffice Community
Build ID: 52c75986adc2b370eb55ce918ab1db0a95831c83
CPU threads: 4; OS: Windows 6.3 Build 9600; UI render: Skia/Raster; VCL: win
Locale: nl-NL (nl_NL); UI: en-US
Calc: CL threaded

Slightly different location: 'constectetur'
Comment 4 m_a_riosv 2022-12-08 16:35:44 UTC
Sorry, but I don't appreciate anything in the video.
Comment 5 Caolán McNamara 2022-12-08 16:40:51 UTC
you have to look closely at the i in the word sit or the l in elit on the same line as the word that is getting its underline toggled, they appear to wiggle/jitter a little wrt their neighbours
Comment 6 m_a_riosv 2022-12-08 22:04:17 UTC
Created attachment 184057 [details]
Screencast 2

Thanks, @Caolan for detailed explanation,
My vision is not very good, with glasses I can see a little bit of the issue when a quick change between [Ctrl+U] and [Ctrl+Z] is done, and with a so high zoom.
Attached is a video capture.
Comment 7 Telesto 2023-02-22 15:09:25 UTC
*** Bug 151327 has been marked as a duplicate of this bug. ***
Comment 8 Khaled Hosny 2023-07-18 12:49:26 UTC
I can not reproduce this on multiple systems with 7.5 and master, is this still reproducible?
Comment 9 Telesto 2023-07-18 19:00:22 UTC
(In reply to ⁨خالد حسني⁩ from comment #8)
> I can not reproduce this on multiple systems with 7.5 and master, is this
> still reproducible?

Still repro
Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community
Build ID: 30ee52e6c284be1095fdf278439b4c0a7c5982f0
CPU threads: 4; OS: Windows 6.3 Build 9600; UI render: Skia/Raster; VCL: win
Locale: nl-NL (nl_NL); UI: en-US
Calc: CL threaded

Screen resolution: 1920x1080 96 DPI
Comment 10 Khaled Hosny 2023-07-18 20:37:36 UTC
Probably spends on the screen resolution then, I have been testing on hipdi screens. I’ll try to test on a lodpi one.
Comment 11 Khaled Hosny 2023-07-19 20:16:42 UTC
(In reply to ⁨خالد حسني⁩ from comment #10)
> Probably spends on the screen resolution then, I have been testing on hipdi
> screens. I’ll try to test on a lodpi one.

I tried on Windows, lodpi, no scaling, and I still can’t reproduce it. I suggested you try again with daily builds once bug 156234 is fixed and see if it makes any difference.
Comment 12 Telesto 2023-07-24 18:04:05 UTC
(In reply to ⁨خالد حسني⁩ from comment #11)
> I tried on Windows, lodpi, no scaling, and I still can’t reproduce it. I
> suggested you try again with daily builds once bug 156234 is fixed and see
> if it makes any difference.

I still reproducing the problem with Skia Raster enabled
Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community
Build ID: 818f8f13128ba78769b4f542ed1efef658de38d9
CPU threads: 4; OS: Windows 6.3 Build 9600; UI render: Skia/Raster; VCL: win
Locale: nl-NL (nl_NL); UI: en-US
Calc: CL threaded
Comment 13 QA Administrators 2025-07-24 03:10:16 UTC
Dear Telesto,

To make sure we're focusing on the bugs that affect our users today, LibreOffice QA is asking bug reporters and confirmers to retest open, confirmed bugs which have not been touched for over a year.

There have been thousands of bug fixes and commits since anyone checked on this bug report. During that time, it's possible that the bug has been fixed, or the details of the problem have changed. We'd really appreciate your help in getting confirmation that the bug is still present.

If you have time, please do the following:

Test to see if the bug is still present with the latest version of LibreOffice from https://www.libreoffice.org/download/

If the bug is present, please leave a comment that includes the information from Help - About LibreOffice.
 
If the bug is NOT present, please set the bug's Status field to RESOLVED-WORKSFORME and leave a comment that includes the information from Help - About LibreOffice.

Please DO NOT

Update the version field
Reply via email (please reply directly on the bug tracker)
Set the bug's Status field to RESOLVED - FIXED (this status has a particular meaning that is not 
appropriate in this case)


If you want to do more to help you can test to see if your issue is a REGRESSION. To do so:
1. Download and install oldest version of LibreOffice (usually 3.3 unless your bug pertains to a feature added after 3.3) from https://downloadarchive.documentfoundation.org/libreoffice/old/

2. Test your bug
3. Leave a comment with your results.
4a. If the bug was present with 3.3 - set version to 'inherited from OOo';
4b. If the bug was not present in 3.3 - add 'regression' to keyword


Feel free to come ask questions or to say hello in our QA chat: https://web.libera.chat/?settings=#libreoffice-qa

Thank you for helping us make LibreOffice even better for everyone!

Warm Regards,
QA Team

MassPing-UntouchedBug