[Libreoffice-bugs] [Bug 46817] Screen font anti-aliasing does not work (Windows)

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=46817

NovarthaWoW at web.de changed:

           What    |Removed                     |Added
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                 CC|                            |NovarthaWoW at web.de

--- Comment #44 from NovarthaWoW at web.de ---
Created attachment 151145
  --> https://bugs.documentfoundation.org/attachment.cgi?id=151145&action=edit
Test of AA using japanese kana with different scaling levels

I have the same or at least a similar issue.

I've attached example screenshots of a file I created yesterday to test a font.
Explanation: 
- The pictures in the "600pc"-folder were taken with a 600% zoom in LO.
- The pictures in the main folder were taken at 100%.
- The name indicates, which features were turned _ON_. (Hardware acceleration
on/off, AA on/off, OpenGL on/off)

I found that the font rendering really depends on the size of the font and the
scaling of the page.
With only 100% zoom the best results always had OpenGL disabled. As soon as
OpenGL was enabled the smaller font sizes were completely horrible. 
So at 100% zoom from the ranking is like this:
Best--------------------------------------------------------------------------------------------------------->Worst
AA enabled+OpenGL disabled            AA+OpenGL enabled                        
        AA disabled+OpenGL enabled

But at 600% it looks completely different. When OpenGL is enabled it looks much
better than with disabled OpenGL.

Without any knowledge on how the rendering is actually done it seems as if the
internal resolution with OpenGL is lower than without. Is subpixel rendering
disabled in this case and/or hinting? 

Additional information:
I have LO 6.2.3.2 installed.
The font I wanted to test (and that was used for the screenshots) was
BabelStone Han v12.1.4( http://www.babelstone.co.uk/Fonts/Han.html Download:
http://www.babelstone.co.uk/Fonts/Download/BabelStoneHan.zip ).
I'm running Windows 10 x64 17763.404 and have a Radeon RX580 8GB. The installed
graphics driver is the latest 19.4.3 release.


Final words: LO's rendering in Windows is not on par with other software like
MS Office, Mozilla Firefox etc. It seems those issue(s) with the rendering on
Windows have a long history. This really prevents adoption of a software. When
somebody wants to give LO and FOSS a try and opens any file on Windows they
will immediately be scared away by the bad font rendering. An office suite is
about that: Text. Writing, formating and displaying it. Imho I think fixing the
Windows rendering should be the top priority. Who cares about 10% shorter
loading times of docx files, if the rendering is always bad?!

Also: The latest comment has been made months ago again and no updates since
then. Is nobody interested in this? (I'm not a programmer so I can't do it
myself.)

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