>>>> Most PDF readers have a mapping from Adobe-Japan1 CID to Unicode >>>> code points as follows. >>>> https://github.com/adobe-type-tools/mapping-resources-pdf/blob/master/pdf2unicode/Adobe-Japan1-UCS2 >>> >>> Is it impossible to discover this mapping from the OTF file alone? >> >> If I understand correctly, yes. > > I guess Masamichi means that the mapping is not part of the font > itself.
Yes. Thanks. >>> Where does the OTF file say it is using encoding Adobe-Japan1-UCS >> >> It is described in ROS in the CFF table. >> https://docs.microsoft.com/en-us/typography/opentype/spec/cff >> http://wwwimages.adobe.com/content/dam/Adobe/en/devnet/font/pdfs/5176.CFF.pdf >> >> ROS means `Registry-Ordering-Supplement`. >> For the current HaranoAjiMincho-Regular.otf, >> Registry is `Adobe`, Ordering is `Japan1`, and Supplement is `7`. >> So it is an `Adobe-Japan1-7` font. >> >> PDF readers use Adobe-Japan1-UCS2 for `Adobe-Japan1-*` fonts. > > Hopefully there is a solution that makes Cairo do the mapping work for > us... If I understand correctly, it is PDF readers that use Adobe-Japan1-UCS, not PDF generators such as cairo. If you use the PS backend and Ghostscript outputs the PDF, it does not use Adobe-Japan1-UCS, but it works fine.
