QSyntaxHighlighter text quality

[John Sturtz]

I'm not sure whether this message originally got through.  I got a 
response indicating it was being held until moderator review because it 
was too large (because I had attached the .ttf file I was working with, 
and that was > 512 Kb).  The message suggested that if I didn't receive 
notification of the moderator's decision, that it would get posted.  And 
I didn't.  At least not so far.

Anyway, I found a solution/work-around for the problem.

In the Highlighter class (that's derived from QSyntaxHighlighter), I 
create a QTextCharFormat object.  If I call 
.setFontHintingPreference(PreferNoHinting) again on that object, then 
the text displayed by the syntax highlighter looks better -- like the 
other text.  (Line #152 in the attached file)

/John


------ Original Message ------
>From "John Sturtz" <john at sturtz.org>
To pyqt at riverbankcomputing.com
Date 11/2/2025 9:21:50 PM
Subject QSyntaxHighlighter text quality

>Hi again.
>
>With some trepidation, I have a question about fonts again.  Not so 
>much about fonts in general, but about display quality of the font I am 
>using.
>
>I have a QTableView with a custom delegate.  The delegate editor is 
>implemented as a QPlainTextEdit widget which has a QSyntaxHighlighter 
>associated with it.
>
>I am loading a .ttf file at runtime and using it as the display font.  
>Initially the quality is pretty poor everywhere [attached screenshot 
>initial.png].
>
>I found online the suggestion to create a font object, call 
>.setHintingPreference(PreferNoHinting) on it, then apply that to the 
>QApplication object [lines #175-177].  That seems to improve the 
>display significantly.
>
>Except for the text displayed by the syntax highlighter.  That text is 
>still pixelated [attached screenshot highlighter.png].  It's as though 
>the .setHintingPreference() call doesn't affect the syntax highlighter.
>
>Wondering if there's any way around this?
>
>Thanks again!
>
>/John
>
>[Sample code, screenshots and font file are attached]
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://www.riverbankcomputing.com/pipermail/pyqt/attachments/20251105/70634d52/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: test.py
Type: text/x-python
Size: 5276 bytes
Desc: not available
URL: <https://www.riverbankcomputing.com/pipermail/pyqt/attachments/20251105/70634d52/attachment.py>