[Fontconfig] editing FcConfig in code

[Akira TAGOH]

Oops, correctly "fullname". No space.

2023年4月14日(金) 23:53 Akira TAGOH <akira at tagoh.org>:

>
>
> 2023年4月14日(金) 23:11 Idriss Fekir <mcsm224 at gmail.com>:
>
>>
>>
>> On 4/14/23 12:16, Akira TAGOH wrote:
>> > On Thu, Apr 13, 2023 at 10:48 PM Idriss Fekir <mcsm224 at gmail.com>
>> wrote:
>> >> Sorry, my question wasn't clear, what i meant is, is there a way in in
>> >> the config file to say, "if given this string, match it to this psname,
>> >> or this full_name", e.g: if given "Iosevka Extrabold Extended Oblique"
>> >> match it to the font with psname:"Iosevka-Extrabold-Extended-Oblique".
>> >
>> > No. we could guess a postscript name from family and/or fullname but
>> > it is't perfect because they are stored as independent metadata. they
>> > are free to set regardless of regularity.
>> >
>> > So you need to do compare "family" and "postscriptname" separately.
>> >
>> >>>> My goal is, at application startup to check for fonts that aren't
>> >>>> matched properly, then remap then load the config, is there a general
>> >>>> solution?
>> >>>
>> >>> That depends on the meaning of "not matched". speaking of the fallback
>> >>> font, that is exactly what fontconfig does. In case of your issue,
>> >>> that is the case-by-case. If there are any generally useful solutions,
>> >>> please let us know.
>> >>>
>> >>
>> >> What could be done in this particular case? that is,
>> >> `fc-match "Isoveka Extrabold Extended Oblique"` outputs
>> >> `Noto Sans Regular` instead of the correct font.
>> >
>> > You want to substitute it with Noto Sans no matter what they exist and
>> > change the weight and the slant too?
>>
>> No, i just want for the font to match correctly,
>> `fc-match "Isoveka Extrabold Extended Oblique"` should output
>> `iosevka-extrabold.ttc: "Iosevka" "Extrabold Extended Oblique"`
>> but it doesn't output that. It outputs `NotoSans-Regular.ttf: "Noto
>> Sans" "Regular"`, which is wrong since i do have that Iosevka font
>> installed.
>>
>
> Ah, got it. You set the wrong query string then. What you want to would be:
>
> $ fc-match ":full name=Isoveka Extrabold Extended Oblique"
>
> Or
>
> $ fc-match "Isoveka:style=Extrabold Extended Oblique"
>
> Though I'm not sure what the real issue was then. I presume that you
> wanted to reproduce your issue on some application with fc-match?
>
>
>> The only way i'm getting the correct font is with
>> `fc-match ":postscriptname=Iosevka-Extrabold-Extended-Oblique"`
>> i just want the output of:
>> `fc-match "Isoveka Extrabold Extended Oblique"`
>> to be identical to the output of:
>> `fc-match ":postscriptname=Iosevka-Extrabold-Extended-Oblique"`
>> (because matching like this with the psname outputs the correct font)
>>
>> Really sorry that my previous question wasn't clear enough.
>>
>> > I didn't test but this may *theoretically* works:
>> >
>> > <match>
>> >    <test name="fullname">
>> >      <string>Isoveka Extrabold Extended Oblique</string>
>> >    </test>
>> >    <edit name="family" mode="prepend">
>> >      <string>Noto Sans</string>
>> >    </edit>
>> >    <edit name="weight" mode="prepend">
>> >      <const>regular</const>
>> >    </edit>
>> >    <edit name="slant" mode="prepend">
>> >      <const>roman</const>
>> >    </edit>
>> > </match>
>> >
>> > This assumes that applications request a font with fullname. you may
>> > need to replace it with "family", and "style" or "weight" and "slant"
>> > in some case.
>> > If you want to fallback only when they aren't available, that may be
>> > much more complicated.
>> >
>> >> Another question, what does `FcConfigSubstituteWithPat` do, i couldn't
>> >> understand from the man page.
>> >
>> > Well, there are three matching patterns in fontconfig. "pattern",
>> > "font", and "scan". These patterns are performed only when "kind" is
>> > the same. however, if you call FcConfigSubstituteWithPat(config,
>> > pfont, ppat, FcMatchFont) then, you can get both "pattern" in ppat and
>> > "font" in pfont FcPatterns. see FcFontRenderPrepare() for more
>> > details.
>> >
>> >>
>> >> Sorry for asking so many questions.
>> >>
>> >> Thank.
>> >> --
>> >> Idriss
>> >
>> >
>> >
>>
>> Thank a lot.
>> --
>> Idriss
>>
>
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