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[instancer] Implement L4 featureVariations

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This commit is contained in:
Behdad Esfahbod 2022-08-11 13:11:45 -06:00
parent bce11dfc85
commit 1ff1a537e8
2 changed files with 29 additions and 15 deletions
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21
Lib/fontTools/varLib/instancer/__init__.py
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@ -694,7 +694,7 @@ def _limitFeatureVariationConditionRange(condition, axisLimit):
def _instantiateFeatureVariationRecord(
record, recIdx, location, fvarAxes, axisIndexMap
record, recIdx, axisLimits, fvarAxes, axisIndexMap
):
applies = True
newConditions = []
@ -702,18 +702,20 @@ def _instantiateFeatureVariationRecord(
if condition.Format == 1:
axisIdx = condition.AxisIndex
axisTag = fvarAxes[axisIdx].axisTag
if axisTag in location:
minValue = condition.FilterRangeMinValue
maxValue = condition.FilterRangeMaxValue
v = location[axisTag]
triple = _expand(axisLimits.get(axisTag, (-1, 0, +1)))
v = triple[1]
if not (minValue <= v <= maxValue):
# condition not met so remove entire record
applies = False
# condition not met so remove entire record
if triple[0] > maxValue or triple[2] < minValue:
newConditions = None
break
else:
# axis not pinned, keep condition with remapped axis index
applies = False
if axisTag in axisIndexMap:
# remap axis index
condition.AxisIndex = axisIndexMap[axisTag]
newConditions.append(condition)
else:
@ -746,6 +748,7 @@ def _limitFeatureVariationRecord(record, axisLimits, axisOrder):
# keep condition with updated limits and remapped axis index
condition.FilterRangeMinValue = newRange.minimum
condition.FilterRangeMaxValue = newRange.maximum
if newRange.minimum != -1 or newRange.maximum != +1:
newConditions.append(condition)
else:
# condition out of range, remove entire record
@ -779,7 +782,7 @@ def _instantiateFeatureVariations(table, fvarAxes, axisLimits):
for i, record in enumerate(table.FeatureVariations.FeatureVariationRecord):
applies, shouldKeep = _instantiateFeatureVariationRecord(
record, i, location, fvarAxes, axisIndexMap
record, i, axisLimits, fvarAxes, axisIndexMap
)
if shouldKeep:
shouldKeep = _limitFeatureVariationRecord(record, axisLimits, axisOrder)
@ -790,7 +793,7 @@ def _instantiateFeatureVariations(table, fvarAxes, axisLimits):
if applies and not featureVariationApplied:
assert record.FeatureTableSubstitution.Version == 0x00010000
for rec in record.FeatureTableSubstitution.SubstitutionRecord:
table.FeatureList.FeatureRecord[rec.FeatureIndex].Feature = rec.Feature
table.FeatureList.FeatureRecord[rec.FeatureIndex].Feature = deepcopy(rec.Feature)
# Set variations only once
featureVariationApplied = True

13
Tests/varLib/instancer/instancer_test.py
View File

@ -1539,9 +1539,10 @@ class InstantiateFeatureVariationsTest(object):
"location, appliedSubs, expectedRecords",
[
({"wght": 0}, {}, [({"cntr": (0.75, 1.0)}, {"uni0041": "uni0061"})]),
# Buggy. See: https://github.com/fonttools/fonttools/issues/2737
(
{"wght": -1.0},
{},
{"uni0061": "uni0041"},
[
({"cntr": (0, 0.25)}, {"uni0061": "uni0041"}),
({"cntr": (0.75, 1.0)}, {"uni0041": "uni0061"}),
@ -1597,6 +1598,16 @@ class InstantiateFeatureVariationsTest(object):
),
],
),
(
{"cntr": (.8, .9, 1.0)},
{"uni0041": "uni0061"},
[
(
{"wght": (0.20886, 1.0)},
{"uni0024": "uni0024.nostroke", "uni0041": "uni0061"},
),
],
),
],
)
def test_partial_instance(self, location, appliedSubs, expectedRecords):