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[OS/2] define recalcXAvgCharWidth method

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copied from current subsetter code (matches ufo2ft's outlineCompiler)
This commit is contained in:
Cosimo Lupo 2022-04-21 18:44:44 +01:00
parent 380f8d573d
commit 3731056401
1 changed files with 14 additions and 0 deletions
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14
Lib/fontTools/ttLib/tables/O_S_2f_2.py
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@ -1,4 +1,5 @@
from fontTools.misc import sstruct from fontTools.misc import sstruct
from fontTools.misc.roundTools import otRound
from fontTools.misc.textTools import safeEval, num2binary, binary2num from fontTools.misc.textTools import safeEval, num2binary, binary2num
from fontTools.ttLib.tables import DefaultTable from fontTools.ttLib.tables import DefaultTable
import bisect import bisect
@ -299,6 +300,19 @@ class table_O_S_2f_2(DefaultTable.DefaultTable):
self.setUnicodeRanges(bits) self.setUnicodeRanges(bits)
return bits return bits
def recalcXAvgCharWidth(self, ttFont):
"""Recalculate xAvgCharWidth using metrics from ttFont's 'hmtx' table.
Set it to 0 if the unlikely event 'hmtx' table is not found.
"""
avg_width = 0
hmtx = ttFont.get("hmtx")
if hmtx:
widths = [m[0] for m in hmtx.metrics.values() if m[0] > 0]
avg_width = otRound(sum(widths) / len(widths))
self.xAvgCharWidth = avg_width
return avg_width
# Unicode ranges data from the OpenType OS/2 table specification v1.7 # Unicode ranges data from the OpenType OS/2 table specification v1.7