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[varLib.models] Refactor common logic

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This commit is contained in:
Behdad Esfahbod 2023-12-11 18:54:16 -07:00
parent 455fc87081
commit 381b55b936
1 changed files with 13 additions and 16 deletions
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29
Lib/fontTools/varLib/models.py
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@ -500,20 +500,25 @@ class VariationModel(object):
return out
@staticmethod
def interpolateFromDeltasAndScalars(deltas, scalars):
"""Interpolate from deltas and scalars fetched from getScalars()."""
def interpolateFromValuesAndScalars(values, scalars):
"""Interpolate from values and scalars coefficients."""
v = None
assert len(deltas) == len(scalars)
for delta, scalar in zip(deltas, scalars):
assert len(values) == len(scalars)
for value, scalar in zip(values, scalars):
if not scalar:
continue
contribution = delta * scalar
contribution = value * scalar
if v is None:
v = contribution
else:
v += contribution
return v
@staticmethod
def interpolateFromDeltasAndScalars(deltas, scalars):
"""Interpolate from deltas and scalars fetched from getScalars()."""
return VariationModel.interpolateFromValuesAndScalars(deltas, scalars)
def interpolateFromDeltas(self, loc, deltas):
"""Interpolate from deltas, at location loc."""
scalars = self.getScalars(loc)
@ -535,17 +540,9 @@ class VariationModel(object):
def interpolateFromMastersAndMasterScalars(masterValues, masterScalars):
"""Interpolate from master-values and master-scalars fetched
from getMasterScalars()."""
v = None
assert len(masterValues) == len(masterScalars)
for master, scalar in zip(masterValues, masterScalars):
if not scalar:
continue
contribution = master * scalar
if v is None:
v = contribution
else:
v += contribution
return v
return VariationModel.interpolateFromValuesAndScalars(
masterValues, masterScalars
)
def piecewiseLinearMap(v, mapping):