Re: Using virtual fonts defined with lua-code

[Hans Hagen <pragma@wxs.nl>]

On 8-2-2011 3:41, Ulrike Fischer wrote:
> Am Tue, 08 Feb 2011 15:13:11 +0100 schrieb Hans Hagen:
>
>> On 8-2-2011 10:40, Ulrike Fischer wrote:
>>> Hello,
>>>
>>> The luatex documentation contains in section "7.2.2 Example virtual
>>> font" an example how to define a virtual font "cmr10-red". The font
>>> is defined by adding the code to the define_font callback.
>
>>> Does some interface exists in contex/mkiv which allows to use such
>>> virtual fonts together with the normal font loading code? E.g. could
>>> I move the code for the font to some file ("cmr10-red.vflua") so
>>> that a request \font\mytest="cmr10-red" will simply find this file
>>> and use the code like vf, tfm or otf-files are found and used when
>>> needed?
>
>> It's relatively easy to add support for that.
>
> That would be fine. There are quite often on various lists questions
> about how to "correct" a font, e.g. adjust kerning, or add a missing
> glyph etc and a interface for "virtual lua fonts" would make such
> corrections much easier.
>
> The example in the documentation uses as base font cmr10 and loads
> it with f = font.read_tfm('cmr10',size). How should one load the
> real font when it is an otf?

the lua file has to return a function that then gets a specification and 
has to return a tfmtable, something like

return myhackery(specification)
     local t = fonts.tfm.read(specification)
     -- mess around with t
     return t
end

but I didn't test that.

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________