[Libreoffice-bugs] [Bug 133273] New: When I write a text in Writer and use the font Tahoma, then some letters stick together.

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=133273

            Bug ID: 133273
           Summary: When I write a text in Writer and use the font Tahoma,
                    then some letters stick together.
           Product: LibreOffice
           Version: 6.1.5.2 release
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: Pawihe at t-online.de

Description:
When you want to see, what I see on my PC, open the attached file:
"Writer bad spaces, Tahoma, without Anti-Aliasin Font10.5.png"

When opening the picture: Make sure that you view the images 1:1 (100%) and
that anti-aliasing is switched off in the image viewer. (For example
Menu->Edit->Settings in "Nomacs").

What can you see in the picture?
An example: In the word "Kunde" with the arrow, "u" and "n" stick together. But
in the word "wundersamen", "u" and "n" do not stick together. There are a lot
further examples in this text, without arrows.

So this is what bothers me: The spaces between the letter look not always the
same.

(Please note: I do not want to use such modern technique like Anti-Aliasing. I
think Anti-Aliasing is good for 4K monitors. But I have a 1280x1024 pixel LCD
monitor. I know that most people use Anti-Aliasing on a 1280x1024 LCD monitor.
But I do not like it. I would rather have a crystal-clear writing with stairs
than a light blurred font without steps. ) 


Letters stick together at Tahoma without anti-aliasing
-----------------------------------------------------------------------------------

-Where can we observe this?
Answer: In the LibreOffice Writer. At any font size. The most error-free font
size is 10 (108dpi).
Please have a look at the attached File "Beispiel für jede Textgrösse.odt"

-Can you see the phenomenon also in Featherpad and Geany?
Answers: At font size 9 (108dpi) it occurs in Wirter, but not in Featherpad.
At font size 9 (108dpi) it occurs in Writer, but not in Geany.

-What happens if you enable anti-aliasing (with 10.5)?
Answer: Then the spacing is better. But there are still a few bad spacing
issues. Please compare the attached file "Writer bad spaces, Tahoma, with
Anti-Aliasin, Font10.5.png"

-What are the letters that always stick together?
Answer: That is different. Sometimes they stick together, a few words later
they don't anymore.

-Does the phenomenon also occur with other fonts? Microsoft fonts, or even
Linux fonts, like DejaVu sans?
Answer: DejaVu Sans: Yes, but much less. Arial: Much less, but irregular
spacing. Attached is an example for DejaVu: File "Font DejaVu Sans.png"

Steps to Reproduce:
1. Install Tahoma on your Linux system
2. Disable Anti-Aliasing on your System
3. Disable in Writer "Smooth screen fonts"
4. Disable in Writer "use Anti-Aliasing"
5. Open the attached document "Beispiel für jede Textgrösse.odt"

Actual Results:
The spaces between letters are irregular. Some letters stick together. Other
have normal spaces. Other have too much space between them.

Expected Results:
The visual impression should be that all distances between the individual
letters are the same.


Reproducible: Always


User Profile Reset: Yes



Additional Info:
I have tried to enable OpenGL. But when I enable it, close Writer. Open it
again, then OpenGL is disabled again. *Confused.

Output from terminal:
$ glxinfo | grep OpenGL
OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) Haswell Desktop 
OpenGL core profile version string: 4.5 (Core Profile) Mesa 18.3.6
OpenGL core profile shading language version string: 4.50
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 18.3.6
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.1 Mesa 18.3.6
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.10
OpenGL ES profile extensions:

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