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111 lines
3.7 KiB
Python
111 lines
3.7 KiB
Python
#MenuTitle: Fixup Vertical Metrics
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# -*- coding: utf-8 -*-
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font = Glyphs.font
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caps = set(font.classes['Uppercase'].code.strip().split(' '))
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lowercase = set(font.classes['Lowercase'].code.strip().split(' '))
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print(font)
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mainMaxDescent = 0
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mainMaxDescentGlyph = ""
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maxDescent = 0
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mainMaxAscent = 0
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mainMaxAscentGlyph = ""
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maxAscent = 0
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typoAscender = 0
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typoDescender = 0
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for master in font.masters:
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ta = max(master.ascender, master.capHeight)
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if typoAscender == 0:
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typoAscender = ta
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elif typoAscender != ta:
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raise Error('ascender or capHeight varies with masters; vertical metrics must be same in all masters')
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td = master.descender
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if typoDescender == 0:
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typoDescender = td
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elif typoDescender != td:
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raise Error('descender or capHeight varies with masters; vertical metrics must be same in all masters')
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for glyph in font.glyphs:
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if not glyph.export:
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continue
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layer = glyph.layers[master.id]
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# get descender of current layer
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descent = layer.bounds.origin.y
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# get ascender of current layer
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ascent = layer.bounds.size.height + descent
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# if descent/ascent of current layer is greater than previous max descents/ascents, update the max descent/ascent
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if descent <= maxDescent:
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maxDescent = descent
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maxDescentGlyph = glyph.name
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if ascent >= maxAscent:
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maxAscent = ascent
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maxAscentGlyph = glyph.name
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# get descender of current layer
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descent = layer.bounds.origin.y
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# get ascender of current layer (total height of layer, subtracting value of descender)
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ascent = layer.bounds.size.height + descent
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# get maximums of only letters in list vars, for typo and hhea values
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if glyph.name in caps and ascent >= mainMaxAscent:
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mainMaxAscent = ascent
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mainMaxAscentGlyph = glyph.name
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if glyph.name in lowercase and descent <= mainMaxDescent:
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# if descent/ascent of current layer is greater than previous max descents/ascents, update the max descent/ascent
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mainMaxDescent = descent
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mainMaxDescentGlyph = glyph.name
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# check values for sanity
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# print(maxDescentGlyph, maxDescent, maxAscentGlyph, maxAscent)
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# make lineGap so that the total of `ascent + descent + lineGap` equals 120% of UPM size
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# UPM = font.upm
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# totalSize = maxAscent + abs(maxDescent)
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# lineGap = int((UPM * 1.2)) - totalSize
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# print(UPM, UPM * 1.2, totalSize, lineGap)
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## use highest/lowest points to set custom parameters for winAscent and winDescent
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## following vertical metric schema from https://github.com/googlefonts/gf-docs/tree/master/VerticalMetrics
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font.customParameters["Use Typo Metrics"] = True
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# ascenderDelta = max(abs(typoAscender), abs(mainMaxAscent)) - min(abs(typoAscender), abs(mainMaxAscent))
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descenderDelta = max(typoDescender, mainMaxDescent) - min(typoDescender, mainMaxDescent)
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if descenderDelta == 0:
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print('descenderDelta is zero -- no change')
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else:
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print('descenderDelta:', descenderDelta)
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for master in font.masters:
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# Win Ascent/Descent = Font bbox yMax/yMin
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master.customParameters["winAscent"] = maxAscent
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master.customParameters["winDescent"] = abs(maxDescent)
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# no/zero line gap
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# if "typoLineGap" in master.customParameters:
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# del master.customParameters["typoLineGap"]
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# if "hheaLineGap" in master.customParameters:
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# del master.customParameters["hheaLineGap"]
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master.customParameters["typoLineGap"] = 0
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master.customParameters["hheaLineGap"] = 0
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master.customParameters["typoDescender"] = typoDescender - descenderDelta
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master.customParameters["hheaDescender"] = typoDescender - descenderDelta
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master.customParameters["typoAscender"] = typoAscender + descenderDelta
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master.customParameters["hheaAscender"] = typoAscender + descenderDelta
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