AMS/CM fonts in OpenType/CFF format

[Philip Taylor (Hellenic Institute)]

Tom — Seeking to test the results of your project to convert the AMS/CM 
fonts in Type 1 format to OpenType/CFF using Adobe's AFDKO, I downloaded 
the contents of your Github repository 
(https://github.com/tkacvins/CM_OTF/archive/refs/heads/master.zip), 
expanded the contents thereof and installed (under Windows) just 
"cmr10.otf".  I then asked XeTeX to process the following :

> % !TeX Program=XeTeX
>
>
> \font \cmr = "cmr10"
>
> \cmr
>
> The quick brown fox jumps right over the laxy dog's back.
>
> \end
>
The TeXworks PDF previewer indicated that the resulting text scaled 
perfectly, so clearly the OTF file was being used (or so I thought).  I 
then amended the code to read :

> % !TeX Program=XeTeX
>
>
> \font \cmr = "cmr9"
>
> \cmr
>
> The quick brown fox jumps right over the laxy dog's back.
>
> \end
>
and found, to my complete surprise, that the text in cmr9 also scaled 
perfectly.  So my question is, "where is XeTeX finding a scaleable 
version of cmr9, when the only OTF file that I have installed from your 
suite is cmr10 ?".  "Start / Control Panel / Fonts" reveals that only 
"CMR 10 Regular" (of your font set) is installed, and a search under 
"C:\TeX\Live\2021" finds only :

> cmr9.afm
> cmr9.mf
> cmr9.pfb
> cmr9.pfm
> cmr9.t3
> cmr9.tfm

Is it possible that XeTeX is using the PFB version and ignoring the 
string quotes around "cmr9" that should force it to use a system font, 
and if so, must I write (/e.g.,/) \font \cmr = "[cmr10.otf]" to force 
XeTeX to use /only/ your OTF versions and to report "Font not found" if 
the relevant font(s) is/are not installed ?  TeX Live and XeTeX lists 
cc'd for comment.

-- 
/Philip Taylor/


>
>
>         The public repository is here
>
>         https://github.com/tkacvins/CM_OTF
>
>         Feel free to add to it.  I can add contributors as necessary.
>
>         What is needed is testing, in particular if the fonts are OK
>         with the existing TFM files.
>         I am not quite sure how to get the TeX Live tools to use
>         OpenType fonts.  In addition,
>         there are some options/input files missing from my initial
>         creation of the fonts that will
>         be addressed later as I figure them out.
>
>         Enjoy!  And please feel free to open issues (as necessary) on
>         github and give feedback
>         as to whether I did anything bone headed.
>
>
>     Ooops, the license needs to be taken care of.  The AMS license
>     says all derivative works
>     need to have the AMS license/copyright removed.  I am hoping that
>     the AMS approves
>     the distribution of the OTF flavors of their fonts with their
>     copyright.  Thoughts?
>
>
> Another thing that needs to be taken care of is Unicode mappings in 
> the OTF.
> makeotf is botching it when making the cmap table in the OTF fonts because
> of the custom encodings of the amsfonts.  Things are not mapping properly.
> There is a way around this using an optional file for makeotf that 
> handles the
> glyph to code mapping, but I have had some problems even with that.  Still
> trying to work it out with the AFDKO folks.
>

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