[Fontconfig] how to enforce scalable fonts

[Werner LEMBERG]

>> Within an application, how can I enforce fontconfig to return
>> scalable fonts only?  In other words, I want the equivalent to
>>
>>   <fontconfig>
>>   <selectfont>
>>    <rejectfont>
>>    <pattern>
>>     <patelt name="scalable"><bool>false</bool></patelt>
>>    </pattern>
>>
>> but without adding that to a local fontconfig config file.
>
> Humm.  I'm out of ideas right now.

For out project (lilypond) it's quite important to have fontconfig
return only scalable fonts.  Perhaps it makes sense to add a new
function to fontconfig which controls that?

I can try to circumvent the issue (this is, using FreeType stuff to
test whether a font is scalable), but then it would be necessary that
fontconfig returns a list of fonts which exactly fit the search
pattern so that I can iterate its elements (or perhaps fontconfig
itself provides such an iterator).  Is this possible?


    Werner