Support Adobe Type1 fonts file format
Type 1 (also known as PostScript, PostScript Type 1, PS1, T1 or Adobe Type 1) is the font format for single-byte digital fonts for use with Adobe Type Manager software and with PostScript printers. It can support font hinting.
It was originally a proprietary specification, but Adobe released the specification to third-party font manufacturers provided that all Type 1 fonts adhere to it.
Type 1 fonts are natively supported in Mac OS X, and in Windows 2000 and later via the GDI API.
See the discussion here: https://github.com/crlf0710/tectonic/issues/117#issuecomment-539834796