Bug 153013

Summary: Rendering regression in Writer 7.5rc1: Text/font is rendered sometimes blury, sometimes sharp
Product: LibreOffice Reporter: Gerry <gerry.treppel>
Component: WriterAssignee: Not Assigned <libreoffice-bugs>
Status: RESOLVED WORKSFORME    
Severity: normal CC: telesto
Priority: medium    
Version: 7.5.0.1 rc   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
Crash report or crash signature: Regression By:
Attachments: First screenshot
Second screenshot

Description Gerry 2023-01-13 20:33:30 UTC 
Description:
I encounter a regression in the rendering of text/fonts in LibreOffice Writer 7.5rc1. I did not see the problem in any previous LibreOffice version such as 7.4.x, 7.3.x.

The rendering of text is sometimes blury and sometimes sharp (see attached screenshots). It changes the state of text rendering from blury to sharp and the other way around. It is also possible, that some paragraphs are sharp while other are blury.

I did not really figure out a pattern in that behaviour of LO Writer, but it seems to be to me that the last line is more likely sharp than the prevous ones. But sometimes, it is the other way around or everything is blury.

Steps to Reproduce:
1. open empty LibreOffice writer text
2. start typing a couple of lines/paragraphs


Actual Results:
3. LibreOffice will show all or some of the text blury or sharp

Expected Results:
Text/fonts should be rendered normally (sharp)


Reproducible: Always


User Profile Reset: No

Additional Info:
Version: 7.5.0.1 (X86_64) / LibreOffice Community
Build ID: 77cd3d7ad4445740a0c6cf977992dafd8ebad8df
CPU threads: 16; OS: Linux 5.15; UI render: default; VCL: gtk3
Locale: fr-FR (fr_FR.UTF-8); UI: fr-FR
Calc: threaded
System: Ubuntu 22.04 with vanilla Gnome Shell
Lenovo ThinkPad T14s Gen 1
AMD® Ryzen 7 pro 4750u with radeon graphics × 16
Comment 1 Gerry 2023-01-13 20:40:43 UTC 
Created attachment 184649 [details]
First screenshot

Please open the screenshot. You see that the third line (paragraph) in the document is rendered sharp while the two first lines are rendered blury.
If you don't see this immediately in the screenshot, please zoom the screenshot to e.g. 450% and compare the rendering. 

It looks to me that antialising works fine for all lines, but the display of the first two lines is just blury.
Comment 2 Gerry 2023-01-13 20:43:48 UTC 
Created attachment 184651 [details]
Second screenshot

Please open the screenshot. 

Again, in this screenshot you see that the first three lines are rendered blury, but the last line is rendered correctly (= sharp). The interesting difference to the "First screenshot" is that the third line/paragraph changed its state from sharp to blury when I entered the fourth line/pargraph. 

If you don't see this immediately in the screenshot, please zoom the screenshot to e.g. 450% and compare the rendering.
Comment 3 Gerry 2023-01-24 23:58:11 UTC 
This bug seems to be resolved in LO 7.5.rc2. --> WORKSFORME

Version: 7.5.0.2 (X86_64) / LibreOffice Community
Build ID: c0dd1bc3f1a385d110b88e26ece634da94921f58
CPU threads: 16; OS: Linux 5.15; UI render: default; VCL: gtk3
Locale: fr-FR (fr_FR.UTF-8); UI: fr-FR
Calc: threaded