125 lines
3.6 KiB
Python
125 lines
3.6 KiB
Python
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"""
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Interpolate OpenType Layout tables (GDEF / GPOS / GSUB).
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"""
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from fontTools.ttLib import TTFont
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from fontTools.varLib import models, VarLibError, load_designspace, load_masters
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from fontTools.varLib.merger import InstancerMerger
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import os.path
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import logging
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from copy import deepcopy
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from pprint import pformat
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log = logging.getLogger("fontTools.varLib.interpolate_layout")
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def interpolate_layout(designspace, loc, master_finder=lambda s: s, mapped=False):
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"""
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Interpolate GPOS from a designspace file and location.
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If master_finder is set, it should be a callable that takes master
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filename as found in designspace file and map it to master font
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binary as to be opened (eg. .ttf or .otf).
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If mapped is False (default), then location is mapped using the
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map element of the axes in designspace file. If mapped is True,
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it is assumed that location is in designspace's internal space and
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no mapping is performed.
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"""
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if hasattr(designspace, "sources"): # Assume a DesignspaceDocument
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pass
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else: # Assume a file path
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from fontTools.designspaceLib import DesignSpaceDocument
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designspace = DesignSpaceDocument.fromfile(designspace)
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ds = load_designspace(designspace)
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log.info("Building interpolated font")
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log.info("Loading master fonts")
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master_fonts = load_masters(designspace, master_finder)
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font = deepcopy(master_fonts[ds.base_idx])
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log.info("Location: %s", pformat(loc))
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if not mapped:
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loc = {name: ds.axes[name].map_forward(v) for name, v in loc.items()}
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log.info("Internal location: %s", pformat(loc))
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loc = models.normalizeLocation(loc, ds.internal_axis_supports)
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log.info("Normalized location: %s", pformat(loc))
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# Assume single-model for now.
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model = models.VariationModel(ds.normalized_master_locs)
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assert 0 == model.mapping[ds.base_idx]
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merger = InstancerMerger(font, model, loc)
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log.info("Building interpolated tables")
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# TODO GSUB/GDEF
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merger.mergeTables(font, master_fonts, ["GPOS"])
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return font
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def main(args=None):
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"""Interpolate GDEF/GPOS/GSUB tables for a point on a designspace"""
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from fontTools import configLogger
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import argparse
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import sys
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parser = argparse.ArgumentParser(
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"fonttools varLib.interpolate_layout",
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description=main.__doc__,
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)
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parser.add_argument(
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"designspace_filename", metavar="DESIGNSPACE", help="Input TTF files"
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)
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parser.add_argument(
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"locations",
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metavar="LOCATION",
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type=str,
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nargs="+",
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help="Axis locations (e.g. wdth=120",
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)
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parser.add_argument(
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"-o",
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"--output",
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metavar="OUTPUT",
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help="Output font file (defaults to <designspacename>-instance.ttf)",
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)
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parser.add_argument(
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"-l",
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"--loglevel",
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metavar="LEVEL",
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default="INFO",
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help="Logging level (defaults to INFO)",
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)
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args = parser.parse_args(args)
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if not args.output:
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args.output = os.path.splitext(args.designspace_filename)[0] + "-instance.ttf"
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configLogger(level=args.loglevel)
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finder = lambda s: s.replace("master_ufo", "master_ttf_interpolatable").replace(
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".ufo", ".ttf"
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)
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loc = {}
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for arg in args.locations:
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tag, val = arg.split("=")
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loc[tag] = float(val)
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font = interpolate_layout(args.designspace_filename, loc, finder)
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log.info("Saving font %s", args.output)
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font.save(args.output)
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if __name__ == "__main__":
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import sys
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if len(sys.argv) > 1:
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sys.exit(main())
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import doctest
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sys.exit(doctest.testmod().failed)
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