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[instancer/CFF2] Comment

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This commit is contained in:
Behdad Esfahbod 2024-05-14 18:26:35 -06:00
parent c22f7d5af4
commit c06e8ba1e8
1 changed files with 12 additions and 5 deletions
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17
Lib/fontTools/varLib/instancer/__init__.py
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@ -576,11 +576,15 @@ def changeTupleVariationAxisLimit(var, axisTag, axisLimit):
def instantiateCFF2(
varfont, axisLimits, *, round=round, specialize=True, generalize=False
):
# The algorithm here is rather simple: Take all blend operations and
# store their deltas in the (otherwise empty) CFF2 VarStore. Then,
# instantiate the VarStore with the given axis limits, and read back
# the new deltas. This is done for both the CharStrings and the Private
# dicts.
# The algorithm here is rather simple:
#
# Take all blend operations and store their deltas in the (otherwise empty)
# CFF2 VarStore. Then, instantiate the VarStore with the given axis limits,
# and read back the new deltas. This is done for both the CharStrings and
# the Private dicts.
#
# Then prune unused things and possibly drop the VarStore if it's empty.
# In which case, TODO: downgrade to CFF table.
log.info("Instantiating CFF2 table")
@ -590,6 +594,7 @@ def instantiateCFF2(
topDict = cff.topDictIndex[0]
varStore = topDict.VarStore.otVarStore
if not varStore:
# TODO Downgrade to CFF if requested.
return
cff.desubroutinize()
@ -804,6 +809,8 @@ def instantiateCFF2(
for private in privateDicts:
del private.vstore
# TODO Downgrade to CFF if requested.
def _instantiateGvarGlyph(
glyphname, glyf, gvar, hMetrics, vMetrics, axisLimits, optimize=True