89 lines
2.4 KiB
Python
89 lines
2.4 KiB
Python
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"""
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Module for dealing with 'gvar'-style font variations, also known as run-time
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interpolation.
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The ideas here are very similar to MutatorMath. There is even code to read
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MutatorMath .designspace files.
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For now, if you run this file on a designspace file, it tries to find
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ttf-interpolatable files for the masters and build a GX variation font from
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them. Such ttf-interpolatable and designspace files can be generated from
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a Glyphs source, eg., using noto-source as an example:
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$ fontmake -o ttf-interpolatable -g NotoSansArabic-MM.glyphs
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Then you can make a GX font this way:
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$ python fonttools/Lib/fontTools/varLib/__init__.py master_ufo/NotoSansArabic.designspace
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API *will* change in near future.
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"""
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from __future__ import print_function, division, absolute_import
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from fontTools.misc.py23 import *
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from fontTools.ttLib import TTFont
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from fontTools.ttLib.tables._g_l_y_f import GlyphCoordinates
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from fontTools.varLib import VariationModel, supportScalar, _GetCoordinates, _SetCoordinates
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import os.path
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def main(args=None):
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import sys
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if args is None:
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args = sys.argv[1:]
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varfilename = args[0]
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locargs = args[1:]
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outfile = os.path.splitext(varfilename)[0] + '-instance.ttf'
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loc = {}
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for arg in locargs:
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tag,valstr = arg.split('=')
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assert len(tag) == 4
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loc[tag] = float(valstr)
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print("Location:", loc)
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print("Loading GX font")
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varfont = TTFont(varfilename)
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fvar = varfont['fvar']
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for axis in fvar.axes:
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lower, default, upper = axis.minValue, axis.defaultValue, axis.maxValue
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v = loc.get(axis.axisTag, default)
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if v < lower: v = lower
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if v > upper: v = upper
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if v == default:
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v = 0
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elif v < default:
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v = (v - default) / (default - lower)
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else:
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v = (v - default) / (upper - default)
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loc[axis.axisTag] = v
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# Location is normalized now
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print("Normalized location:", loc)
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gvar = varfont['gvar']
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for glyphname,variations in gvar.variations.items():
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coordinates,_ = _GetCoordinates(varfont, glyphname)
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for var in variations:
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scalar = supportScalar(loc, var.axes)
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if not scalar: continue
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coordinates += GlyphCoordinates(var.coordinates) * scalar
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_SetCoordinates(varfont, glyphname, coordinates)
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print("Removing GX tables")
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for tag in ('fvar','avar','gvar'):
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if tag in varfont:
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del varfont[tag]
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print("Saving instance font", outfile)
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varfont.save(outfile)
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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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main()
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#sys.exit(0)
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import doctest, sys
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sys.exit(doctest.testmod().failed)
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