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[varLib.avarPlanner] Add library support for glyph frequencies

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No cmdline support yet.
This commit is contained in:
Behdad Esfahbod 2023-07-22 22:04:18 -06:00
parent 7d05b896e6
commit a9fbeda24b
1 changed files with 14 additions and 6 deletions
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20
Lib/fontTools/varLib/avarPlanner.py
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@ -8,21 +8,29 @@ WEIGHTS = [100, 200, 300, 400, 500, 600, 700, 800, 900]
SAMPLES = 8
def getGlyphsetBlackness(glyphset):
def getGlyphsetBlackness(glyphset, frequencies=None):
wght_sum = wdth_sum = 0
for glyph_name in glyphset:
if frequencies is not None:
frequency = frequencies.get(glyph_name, 0)
if frequency == 0:
continue
else:
frequency = 1
glyph = glyphset[glyph_name]
pen = AreaPen(glyphset=glyphset)
glyph.draw(pen)
wght_sum += abs(pen.value) * glyph.width
wdth_sum += glyph.width
wght_sum += abs(pen.value) * glyph.width * frequency
wdth_sum += glyph.width * frequency
return wght_sum / wdth_sum
def planWeightAxis(font, minValue, defaultValue, maxValue, weights=WEIGHTS):
def planWeightAxis(font, minValue, defaultValue, maxValue, weights=WEIGHTS, frequencies=None):
print("Weight min/default/max:", minValue, defaultValue, maxValue)
out = {}
@ -32,7 +40,7 @@ def planWeightAxis(font, minValue, defaultValue, maxValue, weights=WEIGHTS):
axisWeightAverage = {}
for weight in sorted({minValue, defaultValue, maxValue}):
glyphset = font.getGlyphSet(location={"wght": weight})
axisWeightAverage[weight] = getGlyphsetBlackness(glyphset) / (upem * upem)
axisWeightAverage[weight] = getGlyphsetBlackness(glyphset, frequencies) / (upem * upem)
print("Calculated average glyph black ratio:", axisWeightAverage)
@ -53,7 +61,7 @@ def planWeightAxis(font, minValue, defaultValue, maxValue, weights=WEIGHTS):
weight = rangeMin + (rangeMax - rangeMin) * sample / (SAMPLES + 1)
print("Sampling weight", weight)
glyphset = font.getGlyphSet(location={"wght": weight})
weightBlackness[weight] = getGlyphsetBlackness(glyphset) / (upem * upem)
weightBlackness[weight] = getGlyphsetBlackness(glyphset, frequencies) / (upem * upem)
print("Sampled average glyph black ratio:", weightBlackness)
blacknessWeight = {}