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[varLib.merger] avoid reusing the same Class2Record (mutable) objects

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Class2Record is mutable, hence doing `[rec2] * l.Class2Count` produces a list containing multiple references to the same instance. When later on we do the interpolation, modifying one would modify them all.
We need to instantiate distinct objects.

See 6f41c2ab53 (commitcomment-21310803)
This commit is contained in:
Cosimo Lupo 2017-03-14 14:46:17 +00:00
parent d83c2fb209
commit e6125b353e
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GPG Key ID: B61AAAD0B53A6419
1 changed files with 6 additions and 4 deletions
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6
Lib/fontTools/varLib/merger.py
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@ -379,11 +379,13 @@ def _PairPosFormat2_merge(self, lst, merger):
exemplarGlyph = next(iter(classSet))
if exemplarGlyph not in coverage:
if nullRow is None:
nullRow = ot.Class1Record()
class2records = nullRow.Class2Record = []
for _ in range(l.Class2Count):
rec2 = ot.Class2Record()
rec2.Value1 = otBase.ValueRecord(l.ValueFormat1) if l.ValueFormat1 else None
rec2.Value2 = otBase.ValueRecord(l.ValueFormat2) if l.ValueFormat2 else None
nullRow = ot.Class1Record()
nullRow.Class2Record = [rec2] * l.Class2Count
class2records.append(rec2)
rec1 = nullRow
else:
klass = classDef1.get(exemplarGlyph, 0)