[Fontconfig] FcPatternGet always gives font weight of '0'

[Lucien Gentis]

Thanks for your reply, Mr D'Oliveiro

So I tried to replace "Liberation Sans:style=Bold Italic" by "Liberation 
Sans:weight=bold:slant=italic" in my C program, but under Debian 10 , I 
still get:

font family : Liberation Sans
font weight : 0
font slant : 100

Family and slant are OK, only weight is false.

Same program under Linux Ubuntu 18.04 gives :

font family : Liberation Sans
font weight : 200
font slant : 100

Le 10/09/2019 à 00:52, Lawrence D'Oliveiro a écrit :
> On Mon, 9 Sep 2019 18:11:03 +0200, Lucien Gentis wrote:
>
>>       const char * newFont="Liberation Sans:style=Bold Italic";
> ...
>
> I think what you are seeing is the difference in the way Fontconfig
> interprets different pattern specs. Using my Python binding
> <https://github.com/ldo/python_fontconfig>, and recreating what you are
> doing:
>
>      >>> f = fc.Pattern.name_parse("Liberation Sans:style=Bold Italic")
>      >>> f.get("family", 0)
>      ('Liberation Sans', 0)
>      >>> f.get("style", 0)
>      ('Bold Italic', 0)
>      >>> f.get("weight", 0)
>      (None, 1)
>      >>> f.get("slant", 0)
>      (None, 1)
>
> The second number in the result tuples is the status code; the nonzero
> value is FcResultNoMatch for the weight and slant. But if I write the
> pattern this way:
>
>      >>> f = fc.Pattern.name_parse("Liberation Sans:weight=bold:slant=italic")
>      >>> f.get("family", 0)
>      ('Liberation Sans', 0)
>      >>> f.get("style", 0)
>      (None, 1)
>      >>> f.get("weight", 0)
>      (200.0, 0)
>      >>> f.get("slant", 0)
>      (100, 0)
>
> Now you see that the pattern has no style property, but it does have a
> weight and slant. Because that is what I specified. The first variant
> has a style, but no weight or slant, again because that is what I
> specified.
>
> Remember, this is just the search pattern. Once you use this to find an
> actual font, you should get a lot more info back from the matching
> instance pattern.
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