Bug 137307 - Incorrect font size in a SlideShow with "hardware acceleration"
Summary: Incorrect font size in a SlideShow with "hardware acceleration"
Status: RESOLVED WORKSFORME
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Impress (show other bugs)
Version:
(earliest affected)
6.4.6.2 release
Hardware: All All
: medium normal
Assignee: Not Assigned
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2020-10-07 10:13 UTC by Frederic Parrenin
Modified: 2020-10-23 08:47 UTC (History)
0 users

See Also:
Crash report or crash signature:


Attachments
.pptx file to reproduce the problem (56.88 KB, application/vnd.openxmlformats-officedocument.presentationml.presentation)
2020-10-07 10:13 UTC, Frederic Parrenin
Details
screenshot of the slide appearance in slideshow (450.48 KB, image/png)
2020-10-07 10:15 UTC, Frederic Parrenin
Details

Note You need to log in before you can comment on or make changes to this bug.
Description Frederic Parrenin 2020-10-07 10:13:59 UTC
Created attachment 166149 [details]
.pptx file to reproduce the problem

Steps to reproduce:
- open the attached .pptx file
- Go to Tools> Slide Show
=> observe that the numbers in the bottom right of the slide are too small
Comment 1 Frederic Parrenin 2020-10-07 10:15:58 UTC
Created attachment 166150 [details]
screenshot of the slide appearance in slideshow
Comment 2 Frederic Parrenin 2020-10-07 10:17:46 UTC
Sorry, I did not mean Tools>Slideshow but Slideshow>Start from first slide.
Comment 3 Timur 2020-10-22 07:08:36 UTC
No repro Win and Lin.
This is 1 slide so Start from first slide is the same as Slide Show.

Frederic, you have 100+ reports, meaning you are advanced user, but also many reports are WFM, duplicates, not bugs. 
Please raise your report bar with the following:
- write your OS, best copy from Help-About
- test different settings in Options-View (OpenGL or not, Skia or not)
- test daily master from https://dev-builds.libreoffice.org/daily/master/current.html - which is relevant for the bug
- search existing reports for the same issue.
Comment 4 Frederic Parrenin 2020-10-22 12:24:10 UTC
Ok @Timur, here we go.

Version : 6.4.6.2
Build ID : 0ce51a4fd21bff07a5c061082cc82c5ed232f115
Threads CPU : 8; OS : Linux 5.8; UI Render : par défaut; VCL: gtk3; 
Locale : fr-FR (fr_FR.UTF-8); Langue IHM : fr-FR
Calc: threaded

I just noticed that the problem does not show up if I untick "hardware acceleration" (is that OpenGL?) in Tools>Options>display.
So this seems to be related to hardware acceleration.
Comment 5 Frederic Parrenin 2020-10-22 12:29:14 UTC
The problem is also present in 7.0.2 if we select "hardware accelaration".
Comment 6 Frederic Parrenin 2020-10-22 12:45:04 UTC
The bug does not show up in 7.1 master as of yesterday, even with hardware acceleration enable.

Version: 7.1.0.0.alpha0+
Build ID: 86d4419c6c4961c8b473decccea99338c176ffe1
CPU threads: 8; OS: Linux 5.8; UI render: default; VCL: gtk3
Locale: fr-FR (fr_FR.UTF-8); UI: en-US
TinderBox: Linux-rpm_deb-x86_64@86-TDF, Branch:master, Time: 2020-10-21_08:38:05
Calc: threaded
Comment 7 Frederic Parrenin 2020-10-22 12:57:38 UTC
It is still unclear for me how to enable OpenGL or Skia in LibreOffice.
In Optino>View, I only have an option to enable hardware acceleration and to eable anti-aliasing.
Comment 8 Timur 2020-10-22 13:05:31 UTC
(In reply to Frederic Parrenin from comment #7)
> It is still unclear for me how to enable OpenGL or Skia in LibreOffice.
> In Optino>View, I only have an option to enable hardware acceleration and to
> eable anti-aliasing.

You may use Virtual Machine, then it's like that. In physical machine, OpenGL was there until 6.4 and from 7.0 it's replaced with Skia. 

Anyway, I'll close based on Comment 6. 
It's of course better when someone else confirms, possibly finds a fix, but never mind if not possible.
Comment 9 Timur 2020-10-22 13:11:23 UTC
I'll report a need for change. 
https://help.libreoffice.org/7.1/en-US/text/shared/optionen/01010800.html
Comment 10 Frederic Parrenin 2020-10-23 07:49:22 UTC
@Timur: I use Debian Linux on bare metal, not in a VM.
But still, the OpenGL and Skia options do not appear.

It is good to know the bug is not present in 7.1, but there is a long way before this branch becomes the stable one.
Would not it be possible to backport a fix for 6.4 and 7.0?
Comment 11 Timur 2020-10-23 08:46:47 UTC Comment hidden (me-too)
Comment 12 Timur 2020-10-23 08:47:12 UTC
(In reply to Frederic Parrenin from comment #10)
> Would not it be possible to backport a fix for 6.4 and 7.0?
1. That depends on dev and devs are volunteers in LO (but they mostly do backport if justified, sometimes not if dangerous).
2. We don't know the fix, it would take the bibisect, which I can't do because I don't repro, and not sure if you're willing to go into that:
https://wiki.documentfoundation.org/QA/Bibisect