[luatex] luatex - font encoding for type 1 fonts

[Hans Hagen]

On 6/25/2016 3:16 PM, Pali Rohár wrote:

> Problem is that there are no AFM files for CSFonts (and IIRC never
> were). CSFonts are written in MetaFont and (from which were generated
> TFM files) and some subset of CSFonts (those which are often used) were
> later converted to Type 1 variant... Probably nobody generated yet AFM
> files for CSFonts as they were not needed, TeX handle just TFM files.

with an afm file one can also use the fonts in other applications than tex

> So if AFM files are really needed and combination PFB+TFM plus MetaFont
> source code is not enough, how to correctly generate AFM files?

manual, its a text file

> And why cannot be still used TFM files which contains all kerns and
> ligature information?

because one then also needs an encoding vector (an enc file is actually 
a blob of postscript, kind of weird as it could also have been a list)

I'm speaking ConTeXt now: the reason for not bothering about tfm (but 
use afm instead) is that we can use *all* glyphs in a font, not just as 
subset and that made it possible in the early days of luatex to use 
type 1 fonts without bothering about encodings (we only use tfm in 
context for traditional math fonts).

Hans


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