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[varLib.avar] Comment

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This commit is contained in:
Behdad Esfahbod 2024-08-02 20:00:21 -06:00
parent 2742c6287c
commit 132654c9e5
1 changed files with 14 additions and 0 deletions
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14
Lib/fontTools/varLib/avar.py
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@ -19,6 +19,20 @@ def _denormalize(v, axis):
def _pruneLocations(locations, poles, axisTags):
# Now we have all the input locations, find which ones are
# not needed and remove them.
# Note: This algorithm is heavily tied to how VariationModel
# is implemented. It assumes that input was extracted from
# VariationModel-generated object, like an ItemVariationStore
# created by fontmake using varLib.models.VariationModel.
# Some CoPilot blabbering:
# I *think* I can prove that this algorithm is correct, but
# I'm not 100% sure. It's possible that there are edge cases
# where this algorithm will fail. I'm not sure how to prove
# that it's correct, but I'm also not sure how to prove that
# it's incorrect. I'm not sure how to write a test case that
# would prove that it's incorrect. I'm not sure how to write
# a test case that would prove that it's correct.
model = VariationModel(locations, axisTags)
modelMapping = model.mapping
modelSupports = model.supports