884 lines
24 KiB
Python
884 lines
24 KiB
Python
from fontTools.ttLib import newTable
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from fontTools.pens.areaPen import AreaPen
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from fontTools.pens.basePen import NullPen
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from fontTools.pens.statisticsPen import StatisticsPen
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from fontTools.varLib.models import piecewiseLinearMap, normalizeValue
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from fontTools.misc.cliTools import makeOutputFileName
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import math
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import logging
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from pprint import pformat
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__all__ = [
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"planWeightAxis",
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"planWidthAxis",
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"planSlantAxis",
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"planAxis",
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"sanitizeWeight",
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"sanitizeWidth",
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"sanitizeSlant",
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"measureWeight",
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"measureWidth",
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"measureSlant",
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"interpolateLinear",
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"interpolateLog",
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"makeDesignspaceSnippet",
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"addEmptyAvar",
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"main",
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]
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log = logging.getLogger("fontTools.varLib.avarPlanner")
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WEIGHTS = [
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50,
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100,
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150,
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200,
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250,
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300,
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350,
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400,
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450,
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500,
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550,
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600,
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650,
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700,
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750,
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800,
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850,
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900,
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950,
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]
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WIDTHS = [
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50.0,
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62.5,
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75.0,
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87.5,
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100.0,
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112.5,
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125.0,
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137.5,
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150.0,
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162.5,
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175.0,
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187.5,
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200.0,
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]
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SLANTS = list(math.degrees(math.atan(d / 20.0)) for d in range(-20, 21))
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SAMPLES = 8
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def interpolateLinear(t, a, b):
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"""Linear interpolation between a and b, with t typically in [0, 1]."""
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return a + t * (b - a)
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def interpolateLog(t, a, b):
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"""Logarithmic interpolation between a and b, with t typically in [0, 1]."""
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logA = math.log(a)
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logB = math.log(b)
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return math.exp(logA + t * (logB - logA))
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def measureWeight(glyphset, glyphs=None):
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"""Measure the perceptual average weight of the given glyphs."""
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if isinstance(glyphs, dict):
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frequencies = glyphs
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else:
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frequencies = {g: 1 for g in glyphs}
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wght_sum = wdth_sum = 0
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for glyph_name in glyphs:
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if frequencies is not None:
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frequency = frequencies.get(glyph_name, 0)
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if frequency == 0:
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continue
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else:
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frequency = 1
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glyph = glyphset[glyph_name]
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pen = AreaPen(glyphset=glyphset)
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glyph.draw(pen)
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mult = glyph.width * frequency
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wght_sum += mult * abs(pen.value)
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wdth_sum += mult
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return wght_sum / wdth_sum
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def measureWidth(glyphset, glyphs=None):
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"""Measure the average width of the given glyphs."""
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if isinstance(glyphs, dict):
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frequencies = glyphs
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else:
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frequencies = {g: 1 for g in glyphs}
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wdth_sum = 0
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freq_sum = 0
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for glyph_name in glyphs:
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if frequencies is not None:
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frequency = frequencies.get(glyph_name, 0)
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if frequency == 0:
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continue
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else:
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frequency = 1
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glyph = glyphset[glyph_name]
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pen = NullPen()
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glyph.draw(pen)
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wdth_sum += glyph.width * frequency
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freq_sum += frequency
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return wdth_sum / freq_sum
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def measureSlant(glyphset, glyphs=None):
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"""Measure the perceptual average slant angle of the given glyphs."""
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if isinstance(glyphs, dict):
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frequencies = glyphs
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else:
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frequencies = {g: 1 for g in glyphs}
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slnt_sum = 0
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freq_sum = 0
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for glyph_name in glyphs:
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if frequencies is not None:
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frequency = frequencies.get(glyph_name, 0)
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if frequency == 0:
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continue
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else:
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frequency = 1
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glyph = glyphset[glyph_name]
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pen = StatisticsPen(glyphset=glyphset)
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glyph.draw(pen)
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mult = glyph.width * frequency
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slnt_sum += mult * pen.slant
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freq_sum += mult
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return -math.degrees(math.atan(slnt_sum / freq_sum))
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def sanitizeWidth(userTriple, designTriple, pins, measurements):
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"""Sanitize the width axis limits."""
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minVal, defaultVal, maxVal = (
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measurements[designTriple[0]],
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measurements[designTriple[1]],
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measurements[designTriple[2]],
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)
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calculatedMinVal = userTriple[1] * (minVal / defaultVal)
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calculatedMaxVal = userTriple[1] * (maxVal / defaultVal)
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log.info("Original width axis limits: %g:%g:%g", *userTriple)
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log.info(
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"Calculated width axis limits: %g:%g:%g",
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calculatedMinVal,
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userTriple[1],
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calculatedMaxVal,
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)
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if (
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abs(calculatedMinVal - userTriple[0]) / userTriple[1] > 0.05
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or abs(calculatedMaxVal - userTriple[2]) / userTriple[1] > 0.05
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):
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log.warning("Calculated width axis min/max do not match user input.")
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log.warning(
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" Suggested width axis limits: %g:%g:%g",
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calculatedMinVal,
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userTriple[1],
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calculatedMaxVal,
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)
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return False
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return True
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def sanitizeWeight(userTriple, designTriple, pins, measurements):
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"""Sanitize the weight axis limits."""
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if len(set(userTriple)) < 3:
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return True
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minVal, defaultVal, maxVal = (
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measurements[designTriple[0]],
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measurements[designTriple[1]],
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measurements[designTriple[2]],
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)
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logMin = math.log(minVal)
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logDefault = math.log(defaultVal)
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logMax = math.log(maxVal)
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t = (userTriple[1] - userTriple[0]) / (userTriple[2] - userTriple[0])
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y = math.exp(logMin + t * (logMax - logMin))
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t = (y - minVal) / (maxVal - minVal)
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calculatedDefaultVal = userTriple[0] + t * (userTriple[2] - userTriple[0])
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log.info("Original weight axis limits: %g:%g:%g", *userTriple)
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log.info(
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"Calculated weight axis limits: %g:%g:%g",
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userTriple[0],
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calculatedDefaultVal,
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userTriple[2],
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)
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if abs(calculatedDefaultVal - userTriple[1]) / userTriple[1] > 0.05:
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log.warning("Calculated weight axis default does not match user input.")
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log.warning(
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" Suggested weight axis limits, changing default: %g:%g:%g",
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userTriple[0],
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calculatedDefaultVal,
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userTriple[2],
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)
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t = (userTriple[2] - userTriple[0]) / (userTriple[1] - userTriple[0])
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y = math.exp(logMin + t * (logDefault - logMin))
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t = (y - minVal) / (defaultVal - minVal)
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calculatedMaxVal = userTriple[0] + t * (userTriple[1] - userTriple[0])
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log.warning(
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" Suggested weight axis limits, changing maximum: %g:%g:%g",
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userTriple[0],
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userTriple[1],
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calculatedMaxVal,
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)
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t = (userTriple[0] - userTriple[2]) / (userTriple[1] - userTriple[2])
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y = math.exp(logMax + t * (logDefault - logMax))
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t = (y - maxVal) / (defaultVal - maxVal)
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calculatedMinVal = userTriple[2] + t * (userTriple[1] - userTriple[2])
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log.warning(
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" Suggested weight axis limits, changing minimum: %g:%g:%g",
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calculatedMinVal,
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userTriple[1],
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userTriple[2],
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)
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return False
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return True
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def sanitizeSlant(userTriple, designTriple, pins, measurements):
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"""Sanitize the slant axis limits."""
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log.info("Original slant axis limits: %g:%g:%g", *userTriple)
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log.info(
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"Calculated slant axis limits: %g:%g:%g",
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measurements[designTriple[0]],
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measurements[designTriple[1]],
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measurements[designTriple[2]],
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)
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if (
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abs(measurements[designTriple[0]] - userTriple[0]) > 1
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or abs(measurements[designTriple[1]] - userTriple[1]) > 1
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or abs(measurements[designTriple[2]] - userTriple[2]) > 1
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):
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log.warning("Calculated slant axis min/default/max do not match user input.")
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log.warning(
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" Suggested slant axis limits: %g:%g:%g",
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measurements[designTriple[0]],
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measurements[designTriple[1]],
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measurements[designTriple[2]],
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)
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return False
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return True
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def planAxis(
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axisTag,
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measureFunc,
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interpolateFunc,
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glyphSetFunc,
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minValue,
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defaultValue,
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maxValue,
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values=None,
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samples=None,
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glyphs=None,
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designLimits=None,
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pins=None,
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sanitizeFunc=None,
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):
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"""Plan an axis."""
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if samples is None:
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samples = SAMPLES
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if glyphs is None:
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glyphs = glyphSetFunc({}).keys()
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if pins is None:
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pins = {}
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else:
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pins = pins.copy()
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log.info("Value min %g / default %g / max %g", minValue, defaultValue, maxValue)
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triple = (minValue, defaultValue, maxValue)
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if designLimits is not None:
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log.info("Value design-limits min %g / default %g / max %g", *designLimits)
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else:
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designLimits = triple
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# if "avar" in font:
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# log.debug("Checking that font doesn't have axis mapping already.")
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# existingMapping = font["avar"].segments[axisTag]
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# if existingMapping and existingMapping != {-1: -1, 0: 0, +1: +1}:
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# log.error("Font already has a `avar` value mapping. Remove it.")
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if pins:
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log.info("Pins %s", sorted(pins.items()))
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pins.update(
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{
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minValue: designLimits[0],
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defaultValue: designLimits[1],
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maxValue: designLimits[2],
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}
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)
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out = {}
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outNormalized = {}
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axisMeasurements = {}
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for value in sorted({minValue, defaultValue, maxValue} | set(pins.keys())):
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glyphset = glyphSetFunc(location={axisTag: value})
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designValue = pins[value]
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axisMeasurements[designValue] = measureFunc(glyphset, glyphs)
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if sanitizeFunc is not None:
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log.info("Sanitizing axis limit values for the `%s` axis.", axisTag)
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sanitizeFunc(triple, designLimits, pins, axisMeasurements)
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log.debug("Calculated average value:\n%s", pformat(axisMeasurements))
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for (rangeMin, targetMin), (rangeMax, targetMax) in zip(
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list(sorted(pins.items()))[:-1],
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list(sorted(pins.items()))[1:],
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):
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targetValues = {w for w in values if rangeMin < w < rangeMax}
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if not targetValues:
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continue
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normalizedMin = normalizeValue(rangeMin, triple)
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normalizedMax = normalizeValue(rangeMax, triple)
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normalizedTargetMin = normalizeValue(targetMin, designLimits)
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normalizedTargetMax = normalizeValue(targetMax, designLimits)
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log.info("Planning target values %s.", sorted(targetValues))
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log.info("Sampling %u points in range %g,%g.", samples, rangeMin, rangeMax)
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valueMeasurements = axisMeasurements.copy()
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for sample in range(1, samples + 1):
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value = rangeMin + (rangeMax - rangeMin) * sample / (samples + 1)
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log.info("Sampling value %g.", value)
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glyphset = glyphSetFunc(location={axisTag: value})
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designValue = piecewiseLinearMap(value, pins)
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valueMeasurements[designValue] = measureFunc(glyphset, glyphs)
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log.debug("Sampled average value:\n%s", pformat(valueMeasurements))
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measurementValue = {}
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for value in sorted(valueMeasurements):
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measurementValue[valueMeasurements[value]] = value
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out[rangeMin] = targetMin
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outNormalized[normalizedMin] = normalizedTargetMin
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for value in sorted(targetValues):
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t = (value - rangeMin) / (rangeMax - rangeMin)
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targetMeasurement = interpolateFunc(
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t, valueMeasurements[targetMin], valueMeasurements[targetMax]
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)
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targetValue = piecewiseLinearMap(targetMeasurement, measurementValue)
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log.info("Planned mapping value %g to %g." % (value, targetValue))
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out[value] = targetValue
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outNormalized[
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normalizedMin + t * (normalizedMax - normalizedMin)
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] = normalizedTargetMin + (targetValue - targetMin) / (
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targetMax - targetMin
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) * (
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normalizedTargetMax - normalizedTargetMin
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)
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out[rangeMax] = targetMax
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outNormalized[normalizedMax] = normalizedTargetMax
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log.info("Planned mapping for the `%s` axis:\n%s", axisTag, pformat(out))
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log.info(
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"Planned normalized mapping for the `%s` axis:\n%s",
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axisTag,
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pformat(outNormalized),
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)
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if all(abs(k - v) < 0.02 for k, v in outNormalized.items()):
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log.info("Detected identity mapping for the `%s` axis. Dropping.", axisTag)
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out = {}
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outNormalized = {}
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return out, outNormalized
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def planWeightAxis(
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glyphSetFunc,
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minValue,
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defaultValue,
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maxValue,
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weights=None,
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samples=None,
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glyphs=None,
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designLimits=None,
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pins=None,
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sanitize=False,
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):
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"""Plan a weight axis."""
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if weights is None:
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weights = WEIGHTS
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return planAxis(
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"wght",
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measureWeight,
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interpolateLog,
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glyphSetFunc,
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minValue,
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defaultValue,
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maxValue,
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values=weights,
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samples=samples,
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glyphs=glyphs,
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designLimits=designLimits,
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pins=pins,
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sanitizeFunc=sanitizeWeight if sanitize else None,
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)
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def planWidthAxis(
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glyphSetFunc,
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minValue,
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defaultValue,
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maxValue,
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widths=None,
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samples=None,
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glyphs=None,
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designLimits=None,
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pins=None,
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sanitize=False,
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):
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"""Plan a width axis."""
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if widths is None:
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widths = WIDTHS
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return planAxis(
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"wdth",
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measureWidth,
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interpolateLinear,
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glyphSetFunc,
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minValue,
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defaultValue,
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maxValue,
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values=widths,
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samples=samples,
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glyphs=glyphs,
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designLimits=designLimits,
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pins=pins,
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sanitizeFunc=sanitizeWidth if sanitize else None,
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)
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def planSlantAxis(
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glyphSetFunc,
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minValue,
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defaultValue,
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maxValue,
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slants=None,
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samples=None,
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glyphs=None,
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designLimits=None,
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pins=None,
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sanitize=False,
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):
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"""Plan a slant axis."""
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if slants is None:
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slants = SLANTS
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return planAxis(
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"slnt",
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measureSlant,
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interpolateLinear,
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glyphSetFunc,
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minValue,
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defaultValue,
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maxValue,
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values=slants,
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samples=samples,
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glyphs=glyphs,
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designLimits=designLimits,
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pins=pins,
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sanitizeFunc=sanitizeSlant if sanitize else None,
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)
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def makeDesignspaceSnippet(axisTag, axisName, axisLimit, mapping):
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"""Make a designspace snippet for a single axis."""
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designspaceSnippet = (
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' <axis tag="%s" name="%s" minimum="%g" default="%g" maximum="%g"'
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% ((axisTag, axisName) + axisLimit)
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)
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if mapping:
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designspaceSnippet += ">\n"
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else:
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designspaceSnippet += "/>"
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for key, value in mapping.items():
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designspaceSnippet += ' <map input="%g" output="%g"/>\n' % (key, value)
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if mapping:
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designspaceSnippet += " </axis>"
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return designspaceSnippet
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def addEmptyAvar(font):
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"""Add an empty `avar` table to the font."""
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font["avar"] = avar = newTable("avar")
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for axis in fvar.axes:
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avar.segments[axis.axisTag] = {}
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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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from fontTools.ttLib import TTFont
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import argparse
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parser = argparse.ArgumentParser(
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"fonttools varLib.avarPlanner",
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description="Plan `avar` table for variable font",
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)
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parser.add_argument("font", metavar="font.ttf", help="Font file.")
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parser.add_argument(
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"-o",
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"--output-file",
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type=str,
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help="Output font file name.",
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)
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parser.add_argument(
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"--weights", type=str, help="Space-separate list of weights to generate."
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)
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parser.add_argument(
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"--widths", type=str, help="Space-separate list of widths to generate."
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|
)
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parser.add_argument(
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"--slants", type=str, help="Space-separate list of slants to generate."
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|
)
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parser.add_argument("--samples", type=int, help="Number of samples.")
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parser.add_argument(
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"-s", "--sanitize", action="store_true", help="Sanitize axis limits"
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)
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parser.add_argument(
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"-g",
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"--glyphs",
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type=str,
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help="Space-separate list of glyphs to use for sampling.",
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)
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parser.add_argument(
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"--weight-design-limits",
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type=str,
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help="min:default:max in design units for the `wght` axis.",
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|
)
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parser.add_argument(
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"--width-design-limits",
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type=str,
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help="min:default:max in design units for the `wdth` axis.",
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|
)
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parser.add_argument(
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"--slant-design-limits",
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type=str,
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help="min:default:max in design units for the `slnt` axis.",
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|
)
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parser.add_argument(
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"--weight-pins",
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type=str,
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help="Space-separate list of before:after pins for the `wght` axis.",
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|
)
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parser.add_argument(
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"--width-pins",
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type=str,
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|
help="Space-separate list of before:after pins for the `wdth` axis.",
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|
)
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|
parser.add_argument(
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"--slant-pins",
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type=str,
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|
help="Space-separate list of before:after pins for the `slnt` axis.",
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|
)
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|
parser.add_argument(
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"-p", "--plot", action="store_true", help="Plot the resulting mapping."
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|
)
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|
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logging_group = parser.add_mutually_exclusive_group(required=False)
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logging_group.add_argument(
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"-v", "--verbose", action="store_true", help="Run more verbosely."
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)
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logging_group.add_argument(
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"-q", "--quiet", action="store_true", help="Turn verbosity off."
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|
)
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|
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options = parser.parse_args(args)
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|
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configLogger(
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level=("DEBUG" if options.verbose else "WARNING" if options.quiet else "INFO")
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)
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|
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font = TTFont(options.font)
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if not "fvar" in font:
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log.error("Not a variable font.")
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sys.exit(1)
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fvar = font["fvar"]
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wghtAxis = wdthAxis = slntAxis = None
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for axis in fvar.axes:
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if axis.axisTag == "wght":
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wghtAxis = axis
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|
elif axis.axisTag == "wdth":
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wdthAxis = axis
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elif axis.axisTag == "slnt":
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slntAxis = axis
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|
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if "avar" in font:
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existingMapping = font["avar"].segments["wght"]
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if wghtAxis:
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font["avar"].segments["wght"] = {}
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else:
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existingMapping = None
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|
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if options.glyphs is not None:
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glyphs = options.glyphs.split()
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if ":" in options.glyphs:
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glyphs = {}
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for g in options.glyphs.split():
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if ":" in g:
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glyph, frequency = g.split(":")
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glyphs[glyph] = float(frequency)
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else:
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glyphs[g] = 1.0
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else:
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glyphs = None
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|
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|
if wdthAxis:
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log.info("Planning width axis.")
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|
|
|
if options.widths is not None:
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widths = [float(w) for w in options.widths.split()]
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else:
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widths = None
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|
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if options.width_design_limits is not None:
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designLimits = [float(d) for d in options.width_design_limits.split(":")]
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assert (
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len(designLimits) == 3
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and designLimits[0] <= designLimits[1] <= designLimits[2]
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)
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else:
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designLimits = None
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|
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if options.width_pins is not None:
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pins = {}
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for pin in options.width_pins.split():
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before, after = pin.split(":")
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pins[float(before)] = float(after)
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else:
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pins = None
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|
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widthMapping, widthMappingNormalized = planWidthAxis(
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font.getGlyphSet,
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wdthAxis.minValue,
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wdthAxis.defaultValue,
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wdthAxis.maxValue,
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widths=widths,
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samples=options.samples,
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glyphs=glyphs,
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designLimits=designLimits,
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pins=pins,
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sanitize=options.sanitize,
|
|
)
|
|
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if options.plot:
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from matplotlib import pyplot
|
|
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pyplot.plot(
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sorted(widthMappingNormalized),
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[widthMappingNormalized[k] for k in sorted(widthMappingNormalized)],
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)
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pyplot.show()
|
|
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if existingMapping is not None:
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log.info("Existing width mapping:\n%s", pformat(existingMapping))
|
|
|
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if wghtAxis:
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log.info("Planning weight axis.")
|
|
|
|
if options.weights is not None:
|
|
weights = [float(w) for w in options.weights.split()]
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else:
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weights = None
|
|
|
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if options.weight_design_limits is not None:
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designLimits = [float(d) for d in options.weight_design_limits.split(":")]
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assert (
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len(designLimits) == 3
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and designLimits[0] <= designLimits[1] <= designLimits[2]
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)
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else:
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designLimits = None
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|
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if options.weight_pins is not None:
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pins = {}
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for pin in options.weight_pins.split():
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before, after = pin.split(":")
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pins[float(before)] = float(after)
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else:
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pins = None
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|
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weightMapping, weightMappingNormalized = planWeightAxis(
|
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font.getGlyphSet,
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wghtAxis.minValue,
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wghtAxis.defaultValue,
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wghtAxis.maxValue,
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weights=weights,
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samples=options.samples,
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glyphs=glyphs,
|
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designLimits=designLimits,
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pins=pins,
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sanitize=options.sanitize,
|
|
)
|
|
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if options.plot:
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from matplotlib import pyplot
|
|
|
|
pyplot.plot(
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sorted(weightMappingNormalized),
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[weightMappingNormalized[k] for k in sorted(weightMappingNormalized)],
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)
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pyplot.show()
|
|
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if existingMapping is not None:
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log.info("Existing weight mapping:\n%s", pformat(existingMapping))
|
|
|
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if slntAxis:
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log.info("Planning slant axis.")
|
|
|
|
if options.slants is not None:
|
|
slants = [float(w) for w in options.slants.split()]
|
|
else:
|
|
slants = None
|
|
|
|
if options.slant_design_limits is not None:
|
|
designLimits = [float(d) for d in options.slant_design_limits.split(":")]
|
|
assert (
|
|
len(designLimits) == 3
|
|
and designLimits[0] <= designLimits[1] <= designLimits[2]
|
|
)
|
|
else:
|
|
designLimits = None
|
|
|
|
if options.slant_pins is not None:
|
|
pins = {}
|
|
for pin in options.slant_pins.split():
|
|
before, after = pin.split(":")
|
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pins[float(before)] = float(after)
|
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else:
|
|
pins = None
|
|
|
|
slantMapping, slantMappingNormalized = planSlantAxis(
|
|
font.getGlyphSet,
|
|
slntAxis.minValue,
|
|
slntAxis.defaultValue,
|
|
slntAxis.maxValue,
|
|
slants=slants,
|
|
samples=options.samples,
|
|
glyphs=glyphs,
|
|
designLimits=designLimits,
|
|
pins=pins,
|
|
sanitize=options.sanitize,
|
|
)
|
|
|
|
if options.plot:
|
|
from matplotlib import pyplot
|
|
|
|
pyplot.plot(
|
|
sorted(slantMappingNormalized),
|
|
[slantMappingNormalized[k] for k in sorted(slantMappingNormalized)],
|
|
)
|
|
pyplot.show()
|
|
|
|
if existingMapping is not None:
|
|
log.info("Existing slant mapping:\n%s", pformat(existingMapping))
|
|
|
|
if "avar" not in font:
|
|
addEmptyAvar(font)
|
|
|
|
avar = font["avar"]
|
|
|
|
if wdthAxis:
|
|
avar.segments["wdth"] = widthMappingNormalized
|
|
designspaceSnippet = makeDesignspaceSnippet(
|
|
"wdth",
|
|
"Width",
|
|
(wdthAxis.minValue, wdthAxis.defaultValue, wdthAxis.maxValue),
|
|
widthMapping,
|
|
)
|
|
log.info("Width axis designspace snippet:")
|
|
print(designspaceSnippet)
|
|
|
|
if wghtAxis:
|
|
avar.segments["wght"] = weightMappingNormalized
|
|
designspaceSnippet = makeDesignspaceSnippet(
|
|
"wght",
|
|
"Weight",
|
|
(wghtAxis.minValue, wghtAxis.defaultValue, wghtAxis.maxValue),
|
|
weightMapping,
|
|
)
|
|
log.info("Weight axis designspace snippet:")
|
|
print(designspaceSnippet)
|
|
|
|
if slntAxis:
|
|
avar.segments["slant"] = slantMappingNormalized
|
|
designspaceSnippet = makeDesignspaceSnippet(
|
|
"slnt",
|
|
"Slant",
|
|
(slntAxis.minValue, slntAxis.defaultValue, slntAxis.maxValue),
|
|
slantMapping,
|
|
)
|
|
log.info("Slant axis designspace snippet:")
|
|
print(designspaceSnippet)
|
|
|
|
if options.output_file is None:
|
|
outfile = makeOutputFileName(options.font, overWrite=True, suffix=".avar")
|
|
else:
|
|
outfile = options.output_file
|
|
if outfile:
|
|
log.info("Saving %s", outfile)
|
|
font.save(outfile)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
import sys
|
|
|
|
sys.exit(main())
|