/usr/lib/python3/dist-packages/fontTools/varLib/interpolate_layout.py is in python3-fonttools 3.21.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Interpolate OpenType Layout tables (GDEF / GPOS / GSUB).
"""
from __future__ import print_function, division, absolute_import
from fontTools.misc.py23 import *
from fontTools.ttLib import TTFont
from fontTools.varLib import models, VarLibError, load_designspace
from fontTools.varLib.merger import InstancerMerger
import os.path
import logging
from pprint import pformat
log = logging.getLogger("fontTools.varLib.interpolate_layout")
def interpolate_layout(designspace_filename, loc, master_finder=lambda s:s, mapped=False):
"""
Interpolate GPOS from a designspace file and location.
If master_finder is set, it should be a callable that takes master
filename as found in designspace file and map it to master font
binary as to be opened (eg. .ttf or .otf).
If mapped is False (default), then location is mapped using the
map element of the axes in designspace file. If mapped is True,
it is assumed that location is in designspace's internal space and
no mapping is performed.
"""
axes, internal_axis_supports, base_idx, normalized_master_locs, masters, instances = load_designspace(designspace_filename)
log.info("Building interpolated font")
log.info("Loading master fonts")
basedir = os.path.dirname(designspace_filename)
master_ttfs = [master_finder(os.path.join(basedir, m['filename'])) for m in masters]
master_fonts = [TTFont(ttf_path) for ttf_path in master_ttfs]
#font = master_fonts[base_idx]
font = TTFont(master_ttfs[base_idx])
log.info("Location: %s", pformat(loc))
if not mapped:
loc = {name:axes[name].map_forward(v) for name,v in loc.items()}
log.info("Internal location: %s", pformat(loc))
loc = models.normalizeLocation(loc, internal_axis_supports)
log.info("Normalized location: %s", pformat(loc))
# Assume single-model for now.
model = models.VariationModel(normalized_master_locs)
assert 0 == model.mapping[base_idx]
merger = InstancerMerger(font, model, loc)
log.info("Building interpolated tables")
merger.mergeTables(font, master_fonts, ['GPOS'])
return font
def main(args=None):
from fontTools import configLogger
import sys
if args is None:
args = sys.argv[1:]
designspace_filename = args[0]
locargs = args[1:]
outfile = os.path.splitext(designspace_filename)[0] + '-instance.ttf'
# TODO: allow user to configure logging via command-line options
configLogger(level="INFO")
finder = lambda s: s.replace('master_ufo', 'master_ttf_interpolatable').replace('.ufo', '.ttf')
loc = {}
for arg in locargs:
tag,val = arg.split('=')
loc[tag] = float(val)
font = interpolate_layout(designspace_filename, loc, finder)
log.info("Saving font %s", outfile)
font.save(outfile)
if __name__ == "__main__":
import sys
if len(sys.argv) > 1:
sys.exit(main())
import doctest
sys.exit(doctest.testmod().failed)
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