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[cffLib.specializer] Add cmdline to specialize a CFF2 font #3675

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Oct 29, 2024
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[cffLib.specializer] Add cmdline to specialize a CFF2 font #3675

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81 changes: 61 additions & 20 deletions Lib/fontTools/cffLib/specializer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -822,26 +822,67 @@ def specializeProgram(program, getNumRegions=None, **kwargs):
default=None,
help="Number of variable-font regions for blend opertaions.",
)
parser.add_argument(
"--font",
metavar="FONTFILE",
default=None,
help="CFF2 font to specialize.",
)
parser.add_argument(
"-o",
"--output-file",
type=str,
help="Output font file name.",
)

options = parser.parse_args(sys.argv[1:])

getNumRegions = (
None
if options.num_regions is None
else lambda vsIndex: int(options.num_regions[0 if vsIndex is None else vsIndex])
)

program = stringToProgram(options.program)
print("Program:")
print(programToString(program))
commands = programToCommands(program, getNumRegions)
print("Commands:")
print(commands)
program2 = commandsToProgram(commands)
print("Program from commands:")
print(programToString(program2))
assert program == program2
print("Generalized program:")
print(programToString(generalizeProgram(program, getNumRegions)))
print("Specialized program:")
print(programToString(specializeProgram(program, getNumRegions)))
if options.program:
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getNumRegions = (
None
if options.num_regions is None
else lambda vsIndex: int(
options.num_regions[0 if vsIndex is None else vsIndex]
)
)

program = stringToProgram(options.program)
print("Program:")
print(programToString(program))
commands = programToCommands(program, getNumRegions)
print("Commands:")
print(commands)
program2 = commandsToProgram(commands)
print("Program from commands:")
print(programToString(program2))
assert program == program2
print("Generalized program:")
print(programToString(generalizeProgram(program, getNumRegions)))
print("Specialized program:")
print(programToString(specializeProgram(program, getNumRegions)))

if options.font:
from fontTools.ttLib import TTFont

font = TTFont(options.font)
cff2 = font["CFF2"].cff.topDictIndex[0]
charstrings = cff2.CharStrings
for glyphName in charstrings.keys():
charstring = charstrings[glyphName]
charstring.decompile()
getNumRegions = charstring.private.getNumRegions
charstring.program = specializeProgram(
charstring.program, getNumRegions, maxstack=maxStackLimit
)

if options.output_file is None:
from fontTools.misc.cliTools import makeOutputFileName

outfile = makeOutputFileName(
options.font, overWrite=True, suffix=".specialized"
)
else:
outfile = options.output_file
if outfile:
print("Saving", outfile)
font.save(outfile)