[luatex] luatex - font encoding for type 1 fonts

[Hans Hagen]

On 6/25/2016 12:30 PM, Pali Rohár wrote:
> On Friday 24 June 2016 16:03:11 Hans Hagen wrote:
>> On 6/24/2016 2:18 PM, Pali Rohár wrote:
>>> On Friday 24 June 2016 14:14:24 Hans Hagen wrote:
>>>> On 6/24/2016 2:10 PM, Pali Rohár wrote:
>>>>> On Friday 24 June 2016 14:01:25 Hans Hagen wrote:
>>>>>> On 6/24/2016 1:33 PM, Pali Rohár wrote:
>>>>>>>> (2) the several
>>>>>>>> cs related packages don't seem to come with afm files,
>>>>>>>
>>>>>>> Not several, but all! Metrics are stored in ftm files, e.g.
>>>>>>> csr10.tfm. For each font there is metafont source code, tex
>>>>>>> metrics and for some also type1 variant (as pfb file):
>>>>>>> csr10.mf csr10.tfm csr10.pfb
>>>>>>
>>>>>> afaiks no afm files
>>>>>
>>>>> And why do you need afm files? Are not TeX metrics (tfm) enough?
>>>>
>>>> then you can just load the font (given that the afm matches the
>>>> pfb)
>>>
>>> AFM file contains just font metrics, right? Why is TFM file (which
>>> contains also metrics) usable? What I trying understand is where is
>>> the problem as until now TFM + PFB was enough...
>>
>> because afm/pfb files contain info about what characters we have
>> while the tfm file only has metrics (in which case one also needs to
>> interpret the encoding vector)
>
> Do you have some link about description of AFM and TFM files?
>
> IIRC, PFB file has vector of glyph names. So from this information can
> be generated encoding font table as for each glyph name can be assigned
> unicode character. And this could work for any Type 1 font in PFB format
> Or I'm missing something?

an afm file has the metrics as well as the kerns and ligature info; the 
pfb is needed to sort out the glyph index (there is a name <-> index 
mapping in between)

normally a pfb file ships with an afm file (from that one can make a 
tfm); if i'm bored i can make a tfm to afm converter but even then there 
might be some hand-crafting needed so better make sure the csr fonts 
ship as a proper pfb/afm package

Hans


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