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mutator: drop 'ltag' table if no longer referenced from 'name' table

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Cosimo Lupo 2019-01-13 14:42:36 +00:00
parent 57f6e310f3
commit e6d5b5531a
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1 changed files with 10 additions and 0 deletions
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10
Lib/fontTools/varLib/mutator.py
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@ -345,6 +345,16 @@ def instantiateVariableFont(varfont, location, inplace=False):
for i in fvar.instances:
exclude.add(i.subfamilyNameID)
exclude.add(i.postscriptNameID)
if 'ltag' in varfont:
# Drop the whole 'ltag' table if all its language tags are referenced by
# name records to be pruned.
# TODO: prune unused ltag tags and re-enumerate langIDs accordingly
excludedUnicodeLangIDs = [
n.langID for n in varfont['name'].names
if n.nameID in exclude and n.platformID == 0 and n.langID != 0xFFFF
]
if set(excludedUnicodeLangIDs) == set(range(len((varfont['ltag'].tags)))):
del varfont['ltag']
varfont['name'].names[:] = [
n for n in varfont['name'].names
if n.nameID not in exclude