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Ambulance Clerc
461
venv/Lib/site-packages/fontTools/varLib/mutator.py
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461
venv/Lib/site-packages/fontTools/varLib/mutator.py
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"""
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Instantiate a variation font. Run, eg:
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$ fonttools varLib.mutator ./NotoSansArabic-VF.ttf wght=140 wdth=85
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"""
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from fontTools.misc.fixedTools import floatToFixedToFloat, floatToFixed
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from fontTools.misc.roundTools import otRound
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from fontTools.pens.boundsPen import BoundsPen
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from fontTools.ttLib import TTFont, newTable
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from fontTools.ttLib.tables import ttProgram
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from fontTools.ttLib.tables._g_l_y_f import GlyphCoordinates, flagOverlapSimple, OVERLAP_COMPOUND
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from fontTools.varLib.models import (
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supportScalar,
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normalizeLocation,
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piecewiseLinearMap,
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)
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from fontTools.varLib.merger import MutatorMerger
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from fontTools.varLib.varStore import VarStoreInstancer
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from fontTools.varLib.mvar import MVAR_ENTRIES
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from fontTools.varLib.iup import iup_delta
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import fontTools.subset.cff
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import os.path
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import logging
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from io import BytesIO
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log = logging.getLogger("fontTools.varlib.mutator")
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# map 'wdth' axis (1..200) to OS/2.usWidthClass (1..9), rounding to closest
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OS2_WIDTH_CLASS_VALUES = {}
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percents = [50.0, 62.5, 75.0, 87.5, 100.0, 112.5, 125.0, 150.0, 200.0]
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for i, (prev, curr) in enumerate(zip(percents[:-1], percents[1:]), start=1):
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half = (prev + curr) / 2
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OS2_WIDTH_CLASS_VALUES[half] = i
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def interpolate_cff2_PrivateDict(topDict, interpolateFromDeltas):
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pd_blend_lists = ("BlueValues", "OtherBlues", "FamilyBlues",
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"FamilyOtherBlues", "StemSnapH",
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"StemSnapV")
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pd_blend_values = ("BlueScale", "BlueShift",
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"BlueFuzz", "StdHW", "StdVW")
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for fontDict in topDict.FDArray:
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pd = fontDict.Private
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vsindex = pd.vsindex if (hasattr(pd, 'vsindex')) else 0
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for key, value in pd.rawDict.items():
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if (key in pd_blend_values) and isinstance(value, list):
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delta = interpolateFromDeltas(vsindex, value[1:])
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pd.rawDict[key] = otRound(value[0] + delta)
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elif (key in pd_blend_lists) and isinstance(value[0], list):
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"""If any argument in a BlueValues list is a blend list,
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then they all are. The first value of each list is an
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absolute value. The delta tuples are calculated from
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relative master values, hence we need to append all the
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deltas to date to each successive absolute value."""
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delta = 0
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for i, val_list in enumerate(value):
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delta += otRound(interpolateFromDeltas(vsindex,
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val_list[1:]))
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value[i] = val_list[0] + delta
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def interpolate_cff2_charstrings(topDict, interpolateFromDeltas, glyphOrder):
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charstrings = topDict.CharStrings
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for gname in glyphOrder:
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# Interpolate charstring
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# e.g replace blend op args with regular args,
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# and use and discard vsindex op.
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charstring = charstrings[gname]
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new_program = []
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vsindex = 0
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last_i = 0
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for i, token in enumerate(charstring.program):
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if token == 'vsindex':
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vsindex = charstring.program[i - 1]
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if last_i != 0:
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new_program.extend(charstring.program[last_i:i - 1])
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last_i = i + 1
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elif token == 'blend':
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num_regions = charstring.getNumRegions(vsindex)
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numMasters = 1 + num_regions
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num_args = charstring.program[i - 1]
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# The program list starting at program[i] is now:
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# ..args for following operations
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# num_args values from the default font
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# num_args tuples, each with numMasters-1 delta values
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# num_blend_args
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# 'blend'
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argi = i - (num_args * numMasters + 1)
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end_args = tuplei = argi + num_args
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while argi < end_args:
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next_ti = tuplei + num_regions
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deltas = charstring.program[tuplei:next_ti]
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delta = interpolateFromDeltas(vsindex, deltas)
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charstring.program[argi] += otRound(delta)
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tuplei = next_ti
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argi += 1
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new_program.extend(charstring.program[last_i:end_args])
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last_i = i + 1
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if last_i != 0:
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new_program.extend(charstring.program[last_i:])
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charstring.program = new_program
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def interpolate_cff2_metrics(varfont, topDict, glyphOrder, loc):
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"""Unlike TrueType glyphs, neither advance width nor bounding box
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info is stored in a CFF2 charstring. The width data exists only in
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the hmtx and HVAR tables. Since LSB data cannot be interpolated
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reliably from the master LSB values in the hmtx table, we traverse
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the charstring to determine the actual bound box. """
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charstrings = topDict.CharStrings
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boundsPen = BoundsPen(glyphOrder)
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hmtx = varfont['hmtx']
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hvar_table = None
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if 'HVAR' in varfont:
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hvar_table = varfont['HVAR'].table
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fvar = varfont['fvar']
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varStoreInstancer = VarStoreInstancer(hvar_table.VarStore, fvar.axes, loc)
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for gid, gname in enumerate(glyphOrder):
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entry = list(hmtx[gname])
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# get width delta.
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if hvar_table:
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if hvar_table.AdvWidthMap:
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width_idx = hvar_table.AdvWidthMap.mapping[gname]
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else:
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width_idx = gid
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width_delta = otRound(varStoreInstancer[width_idx])
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else:
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width_delta = 0
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# get LSB.
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boundsPen.init()
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charstring = charstrings[gname]
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charstring.draw(boundsPen)
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if boundsPen.bounds is None:
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# Happens with non-marking glyphs
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lsb_delta = 0
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else:
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lsb = otRound(boundsPen.bounds[0])
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lsb_delta = entry[1] - lsb
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if lsb_delta or width_delta:
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if width_delta:
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entry[0] += width_delta
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if lsb_delta:
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entry[1] = lsb
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hmtx[gname] = tuple(entry)
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def instantiateVariableFont(varfont, location, inplace=False, overlap=True):
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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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When the overlap parameter is defined as True,
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OVERLAP_SIMPLE and OVERLAP_COMPOUND bits are set to 1. See
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https://docs.microsoft.com/en-us/typography/opentype/spec/glyf
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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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loc = normalizeLocation(location, axes)
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if 'avar' in varfont:
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maps = varfont['avar'].segments
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loc = {k: piecewiseLinearMap(v, maps[k]) for k,v in loc.items()}
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# Quantize to F2Dot14, to avoid surprise interpolations.
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loc = {k:floatToFixedToFloat(v, 14) for k,v in loc.items()}
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# Location is normalized now
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log.info("Normalized location: %s", loc)
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if 'gvar' in varfont:
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log.info("Mutating glyf/gvar tables")
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gvar = varfont['gvar']
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glyf = varfont['glyf']
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hMetrics = varfont['hmtx'].metrics
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vMetrics = getattr(varfont.get('vmtx'), 'metrics', None)
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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, _ = glyf._getCoordinatesAndControls(glyphname, hMetrics, vMetrics)
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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)
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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, g = glyf._getCoordinatesAndControls(glyphname, hMetrics, vMetrics)
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delta = iup_delta(delta, origCoords, g.endPts)
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coordinates += GlyphCoordinates(delta) * scalar
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glyf._setCoordinates(glyphname, coordinates, hMetrics, vMetrics)
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else:
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glyf = None
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if 'cvar' in varfont:
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log.info("Mutating cvt/cvar tables")
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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] += otRound(delta)
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if 'CFF2' in varfont:
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log.info("Mutating CFF2 table")
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glyphOrder = varfont.getGlyphOrder()
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CFF2 = varfont['CFF2']
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topDict = CFF2.cff.topDictIndex[0]
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vsInstancer = VarStoreInstancer(topDict.VarStore.otVarStore, fvar.axes, loc)
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interpolateFromDeltas = vsInstancer.interpolateFromDeltas
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interpolate_cff2_PrivateDict(topDict, interpolateFromDeltas)
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CFF2.desubroutinize()
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interpolate_cff2_charstrings(topDict, interpolateFromDeltas, glyphOrder)
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interpolate_cff2_metrics(varfont, topDict, glyphOrder, loc)
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del topDict.rawDict['VarStore']
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del topDict.VarStore
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if 'MVAR' in varfont:
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log.info("Mutating MVAR table")
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mvar = varfont['MVAR'].table
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varStoreInstancer = VarStoreInstancer(mvar.VarStore, fvar.axes, loc)
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records = mvar.ValueRecord
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for rec in records:
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mvarTag = rec.ValueTag
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if mvarTag not in MVAR_ENTRIES:
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continue
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tableTag, itemName = MVAR_ENTRIES[mvarTag]
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delta = otRound(varStoreInstancer[rec.VarIdx])
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if not delta:
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continue
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setattr(varfont[tableTag], itemName,
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getattr(varfont[tableTag], itemName) + delta)
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log.info("Mutating FeatureVariations")
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for tableTag in 'GSUB','GPOS':
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if not tableTag in varfont:
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continue
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table = varfont[tableTag].table
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if not getattr(table, 'FeatureVariations', None):
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continue
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variations = table.FeatureVariations
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for record in variations.FeatureVariationRecord:
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applies = True
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for condition in record.ConditionSet.ConditionTable:
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if condition.Format == 1:
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axisIdx = condition.AxisIndex
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axisTag = fvar.axes[axisIdx].axisTag
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Min = condition.FilterRangeMinValue
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Max = condition.FilterRangeMaxValue
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v = loc[axisTag]
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if not (Min <= v <= Max):
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applies = False
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else:
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applies = False
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if not applies:
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break
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if applies:
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assert record.FeatureTableSubstitution.Version == 0x00010000
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for rec in record.FeatureTableSubstitution.SubstitutionRecord:
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table.FeatureList.FeatureRecord[rec.FeatureIndex].Feature = rec.Feature
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break
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del table.FeatureVariations
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if 'GDEF' in varfont and varfont['GDEF'].table.Version >= 0x00010003:
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log.info("Mutating GDEF/GPOS/GSUB tables")
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gdef = varfont['GDEF'].table
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instancer = VarStoreInstancer(gdef.VarStore, fvar.axes, loc)
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merger = MutatorMerger(varfont, instancer)
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merger.mergeTables(varfont, [varfont], ['GDEF', 'GPOS'])
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# Downgrade GDEF.
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del gdef.VarStore
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gdef.Version = 0x00010002
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if gdef.MarkGlyphSetsDef is None:
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del gdef.MarkGlyphSetsDef
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gdef.Version = 0x00010000
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if not (gdef.LigCaretList or
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gdef.MarkAttachClassDef or
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gdef.GlyphClassDef or
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gdef.AttachList or
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(gdef.Version >= 0x00010002 and gdef.MarkGlyphSetsDef)):
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del varfont['GDEF']
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addidef = False
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if glyf:
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for glyph in glyf.glyphs.values():
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if hasattr(glyph, "program"):
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instructions = glyph.program.getAssembly()
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# If GETVARIATION opcode is used in bytecode of any glyph add IDEF
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addidef = any(op.startswith("GETVARIATION") for op in instructions)
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if addidef:
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break
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if overlap:
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for glyph_name in glyf.keys():
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glyph = glyf[glyph_name]
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# Set OVERLAP_COMPOUND bit for compound glyphs
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if glyph.isComposite():
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glyph.components[0].flags |= OVERLAP_COMPOUND
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# Set OVERLAP_SIMPLE bit for simple glyphs
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elif glyph.numberOfContours > 0:
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glyph.flags[0] |= flagOverlapSimple
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if addidef:
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log.info("Adding IDEF to fpgm table for GETVARIATION opcode")
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asm = []
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if 'fpgm' in varfont:
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fpgm = varfont['fpgm']
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asm = fpgm.program.getAssembly()
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else:
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fpgm = newTable('fpgm')
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fpgm.program = ttProgram.Program()
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varfont['fpgm'] = fpgm
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asm.append("PUSHB[000] 145")
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asm.append("IDEF[ ]")
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args = [str(len(loc))]
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for a in fvar.axes:
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args.append(str(floatToFixed(loc[a.axisTag], 14)))
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asm.append("NPUSHW[ ] " + ' '.join(args))
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asm.append("ENDF[ ]")
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fpgm.program.fromAssembly(asm)
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# Change maxp attributes as IDEF is added
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if 'maxp' in varfont:
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maxp = varfont['maxp']
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setattr(maxp, "maxInstructionDefs", 1 + getattr(maxp, "maxInstructionDefs", 0))
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setattr(maxp, "maxStackElements", max(len(loc), getattr(maxp, "maxStackElements", 0)))
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if 'name' in varfont:
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log.info("Pruning name table")
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exclude = {a.axisNameID for a in fvar.axes}
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for i in fvar.instances:
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exclude.add(i.subfamilyNameID)
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exclude.add(i.postscriptNameID)
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if 'ltag' in varfont:
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# Drop the whole 'ltag' table if all its language tags are referenced by
|
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# name records to be pruned.
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# TODO: prune unused ltag tags and re-enumerate langIDs accordingly
|
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excludedUnicodeLangIDs = [
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n.langID for n in varfont['name'].names
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if n.nameID in exclude and n.platformID == 0 and n.langID != 0xFFFF
|
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]
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if set(excludedUnicodeLangIDs) == set(range(len((varfont['ltag'].tags)))):
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del varfont['ltag']
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varfont['name'].names[:] = [
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n for n in varfont['name'].names
|
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if n.nameID not in exclude
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]
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|
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if "wght" in location and "OS/2" in varfont:
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varfont["OS/2"].usWeightClass = otRound(
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max(1, min(location["wght"], 1000))
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)
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if "wdth" in location:
|
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wdth = location["wdth"]
|
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for percent, widthClass in sorted(OS2_WIDTH_CLASS_VALUES.items()):
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if wdth < percent:
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varfont["OS/2"].usWidthClass = widthClass
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break
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else:
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varfont["OS/2"].usWidthClass = 9
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if "slnt" in location and "post" in varfont:
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varfont["post"].italicAngle = max(-90, min(location["slnt"], 90))
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|
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log.info("Removing variable tables")
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for tag in ('avar','cvar','fvar','gvar','HVAR','MVAR','VVAR','STAT'):
|
||||
if tag in varfont:
|
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del varfont[tag]
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||||
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||||
return varfont
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||||
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||||
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||||
def main(args=None):
|
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"""Instantiate a variation font"""
|
||||
from fontTools import configLogger
|
||||
import argparse
|
||||
|
||||
parser = argparse.ArgumentParser(
|
||||
"fonttools varLib.mutator", description="Instantiate a variable font")
|
||||
parser.add_argument(
|
||||
"input", metavar="INPUT.ttf", help="Input variable TTF file.")
|
||||
parser.add_argument(
|
||||
"locargs", metavar="AXIS=LOC", nargs="*",
|
||||
help="List of space separated locations. A location consist in "
|
||||
"the name of a variation axis, followed by '=' and a number. E.g.: "
|
||||
" wght=700 wdth=80. The default is the location of the base master.")
|
||||
parser.add_argument(
|
||||
"-o", "--output", metavar="OUTPUT.ttf", default=None,
|
||||
help="Output instance TTF file (default: INPUT-instance.ttf).")
|
||||
logging_group = parser.add_mutually_exclusive_group(required=False)
|
||||
logging_group.add_argument(
|
||||
"-v", "--verbose", action="store_true", help="Run more verbosely.")
|
||||
logging_group.add_argument(
|
||||
"-q", "--quiet", action="store_true", help="Turn verbosity off.")
|
||||
parser.add_argument(
|
||||
"--no-overlap",
|
||||
dest="overlap",
|
||||
action="store_false",
|
||||
help="Don't set OVERLAP_SIMPLE/OVERLAP_COMPOUND glyf flags."
|
||||
)
|
||||
options = parser.parse_args(args)
|
||||
|
||||
varfilename = options.input
|
||||
outfile = (
|
||||
os.path.splitext(varfilename)[0] + '-instance.ttf'
|
||||
if not options.output else options.output)
|
||||
configLogger(level=(
|
||||
"DEBUG" if options.verbose else
|
||||
"ERROR" if options.quiet else
|
||||
"INFO"))
|
||||
|
||||
loc = {}
|
||||
for arg in options.locargs:
|
||||
try:
|
||||
tag, val = arg.split('=')
|
||||
assert len(tag) <= 4
|
||||
loc[tag.ljust(4)] = float(val)
|
||||
except (ValueError, AssertionError):
|
||||
parser.error("invalid location argument format: %r" % arg)
|
||||
log.info("Location: %s", loc)
|
||||
|
||||
log.info("Loading variable font")
|
||||
varfont = TTFont(varfilename)
|
||||
|
||||
instantiateVariableFont(varfont, loc, inplace=True, overlap=options.overlap)
|
||||
|
||||
log.info("Saving instance font %s", outfile)
|
||||
varfont.save(outfile)
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
import sys
|
||||
if len(sys.argv) > 1:
|
||||
sys.exit(main())
|
||||
import doctest
|
||||
sys.exit(doctest.testmod().failed)
|
||||
Reference in New Issue
Block a user