131 lines
3.6 KiB
Python
131 lines
3.6 KiB
Python
"""
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Instantiate a variation font. Run, eg:
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$ python mutator.py ./NotoSansArabic-VF.ttf wght=140 wdth=85
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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 _GetCoordinates, _SetCoordinates
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from fontTools.varLib.models import supportScalar, normalizeLocation
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from fontTools.varLib.iup import iup_delta
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import os.path
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import logging
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log = logging.getLogger("fontTools.varlib.mutator")
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def instantiateVariableFont(varfont, location, inplace=False):
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""" Generate a static instance from a variable TTFont and a dictionary
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defining the desired location along the variable font's axes.
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The location values must be specified as user-space coordinates, e.g.:
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{'wght': 400, 'wdth': 100}
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By default, a new TTFont object is returned. If ``inplace`` is True, the
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input varfont is modified and reduced to a static font.
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"""
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if not inplace:
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# make a copy to leave input varfont unmodified
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stream = BytesIO()
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varfont.save(stream)
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stream.seek(0)
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varfont = TTFont(stream)
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fvar = varfont['fvar']
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axes = {a.axisTag:(a.minValue,a.defaultValue,a.maxValue) for a in fvar.axes}
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# TODO Apply avar
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# TODO Round to F2Dot14?
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loc = normalizeLocation(location, axes)
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# Location is normalized now
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log.info("Normalized location: %s", loc)
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gvar = varfont['gvar']
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glyf = varfont['glyf']
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# get list of glyph names in gvar sorted by component depth
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glyphnames = sorted(
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gvar.variations.keys(),
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key=lambda name: (
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glyf[name].getCompositeMaxpValues(glyf).maxComponentDepth
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if glyf[name].isComposite() else 0,
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name))
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for glyphname in glyphnames:
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variations = gvar.variations[glyphname]
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coordinates,_ = _GetCoordinates(varfont, glyphname)
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origCoords, endPts = None, None
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for var in variations:
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scalar = supportScalar(loc, var.axes, ot=True)
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if not scalar: continue
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delta = var.coordinates
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if None in delta:
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if origCoords is None:
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origCoords,control = _GetCoordinates(varfont, glyphname)
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endPts = control[1] if control[0] >= 1 else list(range(len(control[1])))
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delta = iup_delta(delta, origCoords, endPts)
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coordinates += GlyphCoordinates(delta) * scalar
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_SetCoordinates(varfont, glyphname, coordinates)
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# Interpolate cvt
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if 'cvar' in varfont:
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cvar = varfont['cvar']
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cvt = varfont['cvt ']
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deltas = {}
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for var in cvar.variations:
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scalar = supportScalar(loc, var.axes)
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if not scalar: continue
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for i, c in enumerate(var.coordinates):
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if c is not None:
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deltas[i] = deltas.get(i, 0) + scalar * c
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for i, delta in deltas.items():
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cvt[i] += int(round(delta))
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log.info("Removing variable tables")
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for tag in ('avar','cvar','fvar','gvar','HVAR','MVAR','VVAR','STAT'):
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if tag in varfont:
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del varfont[tag]
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return varfont
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def main(args=None):
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from fontTools import configLogger
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if args is None:
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import sys
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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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# TODO Allow to specify logging verbosity as command line option
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configLogger(level=logging.INFO)
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loc = {}
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for arg in locargs:
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tag,val = arg.split('=')
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assert len(tag) <= 4
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loc[tag.ljust(4)] = float(val)
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log.info("Location: %s", loc)
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log.info("Loading variable font")
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varfont = TTFont(varfilename)
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instantiateVariableFont(varfont, loc, inplace=True)
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log.info("Saving instance font %s", 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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sys.exit(main())
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import doctest
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sys.exit(doctest.testmod().failed)
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