GeezerVison

# this needs the patch above

import matplotlib
from pathlib import Path
matplotlib.use('ps')
from matplotlib import pyplot as plt

# the following font is in CFF format on my Mac
font = Path('/System/Library/Fonts/AppleSDGothicNeo.ttc')

fig = plt.figure()
plt.axis((0,10,0,10))
plt.text(3,3,'Glib jocks quiz nymph to vex dwarf.', font=font)

matplotlib.rc('ps', fonttype=42)
plt.savefig('fmt42.ps')

matplotlib.rc('ps', fonttype=3)
plt.savefig('fmt3.ps')

@ ghostscript fmt42.ps
GPL Ghostscript 10.04.0 (2024-09-18)
Copyright (C) 2024 Artifex Software, Inc.  All rights reserved.
This software is supplied under the GNU AGPLv3 and comes with NO WARRANTY:
see the file COPYING for details.
Error: /invalidfont in definefont
Operand stack:
   unknown   --dict:11/15(L)--   Font
Execution stack:
   %interp_exit   .runexec2   --nostringval--   definefont   --nostringval--   2   %stopped_push   --nostringval--   definefont   definefont   false   1   %stopped_push   1949   1   3   %oparray_pop   1948   1   3   %oparray_pop   1933   1   3   %oparray_pop   1803   1   3   %oparray_pop   --nostringval--   %errorexec_pop   .runexec2   --nostringval--   definefont   --nostringval--   2   %stopped_push   --nostringval--   1897   2   4   %oparray_pop
Dictionary stack:
   --dict:745/1123(ro)(G)--   --dict:0/20(G)--   --dict:86/200(L)--   --dict:8/10(L)--
Current allocation mode is local
Current file position is 11715
GPL Ghostscript 10.04.0: Unrecoverable error, exit code 1

@ ghostscript fmt42.ps
GPL Ghostscript 10.04.0 (2024-09-18)
Copyright (C) 2024 Artifex Software, Inc.  All rights reserved.
This software is supplied under the GNU AGPLv3 and comes with NO WARRANTY:
see the file COPYING for details.
Error: /invalidfont in definefont
Operand stack:
   AppleSDGothicNeo-Regular   --dict:12/16(L)--   Font
Execution stack:
   %interp_exit   .runexec2   --nostringval--   definefont   --nostringval--   2   %stopped_push   --nostringval--   definefont   definefont   false   1   %stopped_push   1949   1   3   %oparray_pop   1948   1   3   %oparray_pop   1933   1   3   %oparray_pop   1803   1   3   %oparray_pop   --nostringval--   %errorexec_pop   .runexec2   --nostringval--   definefont   --nostringval--   2   %stopped_push   --nostringval--   1897   2   4   %oparray_pop
Dictionary stack:
   --dict:745/1123(ro)(G)--   --dict:0/20(G)--   --dict:86/200(L)--   --dict:8/10(L)--
Current allocation mode is local
Current file position is 18773
GPL Ghostscript 10.04.0: Unrecoverable error, exit code 1