Re: Encoding and mapping glyphs from an expert font

[Thomas A.Schmitz <thomas.schmitz@uni-bonn.de>]

Idris,

I am not sure I have understood everything you write, but here's a very  
brief outline of what I think you need to do. There are two cases you  
need to consider:

1. You have more than one font (this seems to be your case), normally  
these will be postscript type1 fonts (extensions .pfb or .pfa). If you  
want to mix characters from two fonts (say, normal letters from font A,  
oldstyle numerals and maybe small caps from font B), you can most  
easily do this via a virtual font. It's not too hard; I wrote a small  
how-to which you can find on CTAN  
(http://www.ctan.org/tex-archive/info/virtualfontshowto/?action=/tex- 
archive/info/)

2. Your expert glyphs are within the same TrueType font (extension  
.ttf). In that case, the approach would be to have special encoding  
vectors which would be used to produce special tfms. For TeX, this  
would then constitute a new font (this is explained in the article I  
sent you last week.)

So there is no simple answer to your question. TeX knows to pick up  
zerooldstyle instead of zero either
1. because you have a virtual font that says MAPFONT 1, so it knows it  
will have to use a different pfb than for the rest, or
2. because the encoding file points to character zerooldstyle within  
the ttf.

Sounds too complicated? It isnt!

Best

Thomas

On Apr 9, 2005, at 11:02 PM, Idris Samawi Hamid wrote:

> [To all the font experts out there: I really need your help!! I have  
> spent at
> least 12 hours (!) trying to make this work but to no avail.]
>
> Dear gang,
>
> I have two fonts (actually, lots more but let's keep it simple), one  
> normal
> and one expert. I did the following:
>
> 1. installed the regular font with texnansi encoding. It works fine.  
> It uses,
> say,
>
> texnansi-myfont.map, texnansi-lm.enc
>
> with lines like
>
> ====================================================
> texnansi-raw-myfont  MyFont 4 <texnansi-lm.enc <myfont.pfb
> ====================================================
>
> 2. also installed the expert font with a private encoding. Basically  
> the same
> as
> texnansi where they share characters in common. It uses, say,
>
> myfontx.map, myencoding.enc
>
> with lines like
>
> ====================================================
> myencoding-raw-myfontx MyFontX 4 < myfont.pfb   myencoding.enc
> ====================================================
>
> 3. With a view to getting characters from my expert font, I carefully  
> studied
> as best as I could the implementation of old style figures in lmr,  
> which
> involves mappings to cmmi10. This is what I could figure out:  
> Activating old
> style is done by
>
> ====================================================
> \usetypescript [modern][texnansi]
> \usetypescript [map]   [latin-modern-os] [texnansi]
>
> \usetypescript[latin-modern][texnansi]
> \setupbodyfont[latin-modern]
> ====================================================
>
> There appear to be two main things going on (but I think I'm missing
> something):
>
> a. loading a map file:
>
> ====================================================
> \starttypescript [map] [latin-modern-os] [ec,texnansi,qx,t5,pl0,il2]
>   \loadmapfile[\typescriptthree-os-public-lm.map]
> \stoptypescript
> ====================================================
>
> Since I'm using texnansi, I looked at texnansi-os-public-lm.map . It  
> contains
> lines like
>
> ====================================================
> texnansi-lmb10 LMRomanDemi10-Regular <texnansi-os-lm.enc <lmb10.pfb
> ====================================================
>
> So I designed an encoding file myfont-plus.enc almost identical to
> texnansi-os-lm.enc, containing, e.g., old style numerals from my  
> expert font.
> I edited the myfont map files to exactly match the syntax of both
>
> texnansi-os-public-lm.map
> and
> texnansi-public-lm.map
>
> So for my fonts I have a total of three map files:
>
> \loadmapfile[texnansi-myfont.map]
>  % for regular font
>
> \loadmapfile[myencoding-myfontx.map]
> % for expert font
>
> \loadmapfile[texnansi-x-myfont.map]
> % for mapping minion reg to minion ex
>
>> From this point I am lost. I set up my type-myfont.tex to load these  
>> maps. I
> can get myfont to work alone, and myfontx to work alone, but I cannot  
> map
> characters from myfontx to myfont.
>
> By the way, I still don't understand how placing, e.g., /zerooldstyle  
> in the
> respective /zero position in an encoding file will instruct  
> LatinModern to
> pick up the glyph from cmmi10. In, for example,
>
> ====================================================
> texnansi-lmb10 LMRomanDemi10-Regular <texnansi-os-lm.enc <lmb10.pfb
> ====================================================
>
> How does ConTeXt know that /zerooldstyle is to be mapped to cmmbi10?
> I must be missing something....
>
> Thnx in advance for your help
> Idris
>
> ============================
> Professor Idris Samawi Hamid
> Department of Philosophy
> Colorado State University
> Fort Collins, CO 80523
>
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