[Fontconfig] Granular synthetic emboldening possible ?

[Jay Aurabind]

On Fri, 25 Jan 2019 at 09:35, Lawrence D'Oliveiro <ldo at geek-central.gen.nz>
wrote:

> On Thu, 24 Jan 2019 12:37:31 +0530, Jay Aurabind wrote:
>
> > This begs the question, are there any FreeType Supported font formats
> > that can actually do granular weight rendering if requested by
> > fontconfig?
>
> As I understand it, what you really want to do is get a list of all the
> weights available for a particular family, and choose the next higher
> one from a given one?
>
> Fontconfig has no API for directly returning this, but it is easy
> enough to implement the function for yourself.
>
> Following is an example Python script that, given a font spec, finds
> all weights available for the best matching font family. For example,
> on my current system setup,
>
>     family_weights palatino
>
> returns
>
>     family 'P052' members [{'weight': 80, 'file':
> '/usr/share/fonts/type1/urw-base35/P052-Italic.t1'}, {'weight': 100,
> 'file': '/usr/share/fonts/type1/urw-base35/P052-Roman.t1'}, {'weight': 200,
> 'file': '/usr/share/fonts/type1/urw-base35/P052-Bold.t1'}, {'weight': 200,
> 'file': '/usr/share/fonts/type1/urw-base35/P052-BoldItalic.t1'}]
>
> Adapt as appropriate.
>

Thank you very much for sharing this.

> ----
> #!/usr/bin/python3
> #+
> # Find all weights for a given family. Invoke this script as follows:
> #
> #     family_weights «font-spec»
> #
> # and it will return a list of all fonts with a common family name
> # matching «font-spec», in order of increasing weight.
> #-
>
> import sys
> import getopt
> import freetype2 as ft # <https://github.com/ldo/python_freetype>
> import fontconfig as fc # <https://github.com/ldo/python_fontconfig>
> from fontconfig import \
>     FC
>
> if len(sys.argv) != 2 :
>     raise getopt.GetoptError("need exactly one arg, the Fontconfig pattern
> to match")
> #end if
>
> conf = fc.Config.get_current()
> pat = fc.Pattern.name_parse(sys.argv[1])
> conf.substitute(pat, FC.MatchPattern)
> pat.default_substitute()
> family_name = None
> found = []
> for entry in conf.font_sort(pat, trim = False, want_coverage = False)[0] :
>     this_family = entry.get(FC.FAMILY, 0)[0]
>     if family_name == None or this_family == family_name :
>         if family_name == None :
>             family_name = this_family
>         #end if
>         found.append({"weight" : entry.get(FC.WEIGHT, 0)[0], "file" :
> entry.get(FC.FILE, 0)[0]})
>     #end if
> #end for
> found = sorted(found, key = lambda x : x["weight"])
> sys.stdout.write("family %s members %s\n" % (repr(family_name),
> repr(found)))
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>


-- 

Thanks and Regards,
*Aurabindo J*
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