def featureVarsTestFont():
fb = FontBuilder(unitsPerEm=100)
fb.setupGlyphOrder([".notdef", "f", "f_f", "dollar", "dollar.rvrn"])
fb.setupCharacterMap({ord("f"): "f", ord("$"): "dollar"})
fb.setupNameTable({
"familyName": "TestFeatureVars",
"styleName": "Regular"
})
fb.setupPost()
fb.setupFvar(axes=[("wght", 100, 400, 900, "Weight")], instances=[])
fb.addOpenTypeFeatures("""\
feature dlig {
sub f f by f_f;
} dlig;
""")
fb.addFeatureVariations([([{
"wght": (0.20886, 1.0)
}], {
"dollar": "dollar.rvrn"
})],
featureTag="rvrn")
buf = io.BytesIO()
fb.save(buf)
buf.seek(0)
return TTFont(buf)
def test_subset_feature_variations():
fb = FontBuilder(unitsPerEm=100)
fb.setupGlyphOrder([".notdef", "f", "f_f", "dollar", "dollar.rvrn"])
fb.setupCharacterMap({ord("f"): "f", ord("$"): "dollar"})
fb.setupNameTable({
"familyName": "TestFeatureVars",
"styleName": "Regular"
})
fb.setupPost()
fb.setupFvar(axes=[("wght", 100, 400, 900, "Weight")], instances=[])
fb.addOpenTypeFeatures("""\
feature dlig {
sub f f by f_f;
} dlig;
""")
fb.addFeatureVariations([([{
"wght": (0.20886, 1.0)
}], {
"dollar": "dollar.rvrn"
})],
featureTag="rvrn")
buf = io.BytesIO()
fb.save(buf)
buf.seek(0)
font = TTFont(buf)
options = subset.Options()
subsetter = subset.Subsetter(options)
subsetter.populate(unicodes=[ord("f"), ord("$")])
subsetter.subset(font)
featureTags = {
r.FeatureTag
for r in font["GSUB"].table.FeatureList.FeatureRecord
}
# 'dlig' is discretionary so it is dropped by default
assert "dlig" not in featureTags
assert "f_f" not in font.getGlyphOrder()
# 'rvrn' is required so it is kept by default
assert "rvrn" in featureTags
assert "dollar.rvrn" in font.getGlyphOrder()