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June 6, 2023 10:22
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Script to append a new axis to fvar and related variation tables
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| import sys | |
| import argparse | |
| import logging | |
| from fontTools.ttLib import TTFont | |
| from fontTools.ttLib.tables._f_v_a_r import Axis | |
| from fontTools.varLib.builder import buildVarRegionAxis | |
| log = logging.getLogger("add_fvar_axis.py") | |
| def main(): | |
| parser = argparse.ArgumentParser(description="Add a new axis to a variable font.") | |
| parser.add_argument("font", help="The font to modify") | |
| parser.add_argument("axis", help="The axis tag=min,default,max", nargs="+") | |
| parser.add_argument("-o", "--output", help="The output font") | |
| parser.add_argument("-v", "--verbose", action="store_true") | |
| args = parser.parse_args() | |
| logging.basicConfig(level="DEBUG" if args.verbose else "INFO") | |
| font = TTFont(args.font, lazy=False) | |
| font.ensureDecompiled() | |
| fvar = font["fvar"] | |
| name = font["name"] | |
| for axis in args.axis: | |
| tag, values = axis.split("=") | |
| values = [float(v) for v in values.split(",")] | |
| axis = Axis() | |
| axis.axisTag = tag | |
| axis.minValue, axis.defaultValue, axis.maxValue = values | |
| axis.axisNameID = name.addName(tag, platforms=((3, 1, 0x409),)) | |
| fvar.axes.append(axis) | |
| for instance in fvar.instances: | |
| instance.coordinates[tag] = axis.defaultValue | |
| avar = font.get("avar") | |
| if avar is not None: | |
| segments = avar.segments | |
| for axis in fvar.axes: | |
| if axis.axisTag not in segments: | |
| segments[tag] = {-1.0: -1.0, 0.0: 0.0, 1.0: 1.0} | |
| for tableTag in font.keys(): | |
| table = font[tableTag] | |
| if ( | |
| getattr(table, "table", None) is None | |
| or getattr(table.table, "VarStore", None) is None | |
| ): | |
| continue | |
| log.info(f"Updating {tableTag}.VarStore") | |
| varStore = table.table.VarStore | |
| for region in varStore.VarRegionList.Region: | |
| for _ in range(len(args.axis)): | |
| region.VarRegionAxis.append(buildVarRegionAxis((0, 0, 0))) | |
| if args.output: | |
| font.save(args.output) | |
| if __name__ == "__main__": | |
| main() |
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