[luatex] luatex - font encoding for type 1 fonts

[Hans Hagen]

On 6/26/2016 1:25 PM, Pali Rohár wrote:

> But I'm trying to point something else, that csr.enc file does not have
> to be specified.
>
> File csr.enc contains:
>
>   /il2Encoding [
>   /Gamma /Delta /Theta /Lambda /Xi /Pi /Sigma /Upsilon
>   ...
>   /quotedblbase /csquotedblright
>   ] def
>
> File csr10.pfb contains:
>
>   /FontName /csr10 def
>   /Encoding 256 array
>   0 1 255 {1 index exch /.notdef put} for
>   dup 0 /Gamma put
>   dup 1 /Delta put
>   dup 2 /Theta put
>   dup 3 /Lambda put
>   dup 4 /Xi put
>   dup 5 /Pi put
>   dup 6 /Sigma put
>   dup 7 /Upsilon put
>   ...
>   dup 254 /quotedblbase put
>   dup 255 /csquotedblright put
>   readonly def
>   ...
>   2 index /CharStrings 183 dict dup begin
>   /Xi {
>   ...
>   }
>   /dotlessi {
>   ...
>   }
>   /oslash {
>   ...
>   }
>   ...
>
> So glyphs are really in random order in csr10.pfb file (first is /Xi,
> second /dotlessi, ...) but at beginning of csr10.pfb file is /Encoding
> table where is that mapping from index to glyph name. Same what is in
> csr.enc file.
>
> And I'm trying to tell you that in this case (when /Encoding array in
> pfb file is available), external *.enc is not needed to specify. Looks
> like that pdftex uses this /Encoding array.

the enc files shows what glyphs (by name) are in the tfm file and the 
vector in the pfb file tels what glyphs (by name) are in what slot .. 
these are different indexes and the name makes it possibel to go from 
the tex one to the pfb one

(for adobe standard encoding it in parallel but tex encodings are hardly 
standard)

> I think it could be useful if that your loader was able to understand
> command also when pfb file is not specified. It could try to load either
> pfb file (preferred) or fallback to PK/metafont.

the more hardcoded logic is in there, the harder it is to beat (i can 
impose some logic in context but want to stay away from intefreing in 
other macro packages logic)

> it has (internal/system pdftex.map) database of Type 1 fonts and

only system .. in luatex i never use map files

Hans


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