Re: editing FcConfig in code

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First of all, Please note that "Regular" style is default style
though, most applications request *Regular weight* instead of style
name. So the correct command to represent a request is `fc-match
"Amber Whiskey:weight=regular".
Based on that, let's see what happened.

AmberWhiskey-Aged.otf has two family names. one is "Amber Whiskey" and
one is "Amber Whiskey Aged". And, weight is set to 80 which is the
same as FC_WEIGHT_REGULAR. So the behavior itself isn't wrong.

Second, I don't recommend using the above config because that will
break non-Regular selection. I didn't test but this may works instead:

  <test name="family">
    <string>Amber Whiskey</string>
  <test name="weight">
  <test qual="all" name="style" compare="eq">
  <edit name="style">

This will add Regular to style property only when weight is set to
"regular" and no styles is set. you can still pick up the aged variant
with "Amber Whiskey:style=Aged".

If you don't want to see the aged variant as a part of "Amber
Whiskey", things would be much simpler. you may have another
workaround like this:

<match target="scan">
  <test name="family">
    <string>Amber Whiskey</string>
  <test name="family">
    <string>Amber Whiskey Aged</string>
  <edit name="family" mode="delete" />

This will modify the fontconfig cache. AmberWhiskey-Aged.otf is then
represented as "Amber Whiskey Aged" only.

For your original question, if there are any reasons you can't put
something into a config file, you can use
FcConfigParseAndLoadFromMemory() function as said in other mail.
otherwise you can create your own config for a workaround and put it
into $HOME/.config/fontconfig or something like that.

Hope that helps,

On Wed, Apr 12, 2023 at 9:12 AM Idriss Fekir <mcsm224@xxxxxxxxx> wrote:
> Hi,
> Some fonts aren't matched by fontconfig correctly e.g: the Amber Whiskey
> family has 4 faces Regular, Aged, Full Color, Shadow.
> `fc-match "Amber Whiskey"` outputs "Aged" instead of "Regular", And
> since Pango relies on fontconfig for that, it also exhibits the same
> behavior (e.g: Inkscape an gimp, both rely on pango, would pick the
> "Aged" variant). This could be worked around with a rule:
> ```
> <match target="pattern">
>      <test name="family">
>          <string>Amber Whiskey</string>
>      </test>
>      <edit name="style">
>          <string>Regular</string>
>      </edit>
> </match>
> ```
> My question is how can i do that but in code (in C), that is
> how can i check what fc-match would output, then if the output is wrong
> add a rule like the following to the FcConfig?
> I'm open to suggestions if there are better ways.
> I did read the docs but i couldn't figure out how.
> The man page for FcFontMatch says that it should only be called after
> FcConfigSubstitute and FcDefaultSubstitute have been called for
> the pattern, i don't understand what that means exactly.
> Thanks a lot.


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