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[varLib.avarPlanner] Better blackness calculation

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Consider glyph width.
This commit is contained in:
Behdad Esfahbod 2023-07-22 22:01:03 -06:00
parent 8557e535eb
commit 7d05b896e6
1 changed files with 3 additions and 3 deletions
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6
Lib/fontTools/varLib/avarPlanner.py
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@ -16,7 +16,7 @@ def getGlyphsetBlackness(glyphset):
pen = AreaPen(glyphset=glyphset)
glyph.draw(pen)
wght_sum += abs(pen.value)
wght_sum += abs(pen.value) * glyph.width
wdth_sum += glyph.width
return wght_sum / wdth_sum
@ -32,7 +32,7 @@ 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
axisWeightAverage[weight] = getGlyphsetBlackness(glyphset) / (upem * upem)
print("Calculated average glyph black ratio:", axisWeightAverage)
@ -53,7 +53,7 @@ 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
weightBlackness[weight] = getGlyphsetBlackness(glyphset) / (upem * upem)
print("Sampled average glyph black ratio:", weightBlackness)
blacknessWeight = {}