Font families are truncated

[John F Sturtz]

Alas.  Still working in (Py)Qt5.  I'm probably stuck with it then.

Thanks.

/John

> Charles <mailto:peacech at gmail.com>
> Thursday, November 14, 2024 10:35 PM
> That is the limitation of using GDI font engine. If you are using 
> Qt>=6.7, trying using -platform windows:fontengine=directwrite command 
> line parameter.
>
> John F Sturtz <mailto:john at sturtz.org>
> Thursday, November 14, 2024 9:12 PM
> Greetings again!
>
> This is perhaps a bit of an esoteric question.
>
> I am using QFontDatabase and QFont to query and manipulate some 
> display fonts.  On my system, there are some font family/variant 
> combinations that have pretty long names.  Several in the Bahnschrift 
> family, for instance -- Bahnschrift SemiBold SemiCondensed, 
> Bahnschrift SemiLight SemiCondensed, and so on.
>
> The Windows font settings app lists these with their full names.  
> Also, if I query the .ttf file directly:
>
>     path = r'C:\Windows\fonts\bahnschrift.ttf'
>     font = ttLib.TTFont(path)
>     for instance in font["fvar"].instances:
>         style = font["name"].getName(instance.subfamilyNameID, 3, 1, 
> 0x409)
>         print(style)
>
> I get the full names.
>
> However, if I get a list of font families using 
> QFontDatabase().families(), the names that are returned are truncated 
> to (oddly) 31 characters.  So, for example, Bahnschrift SemiBold 
> SemiConden, Bahnschrift SemiLight SemiConde, and the like.
>
> And indeed, if I want to create a QFont object for these, I seem to 
> need to use the truncated names:
>
> QFont('Bahnschrift SemiBold SemiConden')        # These work
> QFont('Bahnschrift SemiLight SemiConde')
>
> QFont('Bahnschrift SemiBold SemiCondensed')     # These do not
> QFont('Bahnschrift SemiLight SemiCondensed')
>
> Not a huge deal, but it's a little difficult, because the names PyQt 
> seems to recognize aren't the ones I'd want to present to the user 
> (nor ones I would have thought to use, but for the fact that 
> QFontDatabase().families() gave them to me that way).  Any thoughts as 
> to why?
>
> Thanks again, as always!
>
> /John

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