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[varLib] use magic -0x8000 to ignore post.underline* for MVAR

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googlei18n/ufo2ft#308 (comment)
googlei18n/ufo2ft#310
This commit is contained in:
Cosimo Lupo 2019-01-15 18:19:19 +00:00
parent 7d947c9fd8
commit 93e791ab24
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GPG Key ID: 59D54DB0C9976482
1 changed files with 8 additions and 11 deletions
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19
Lib/fontTools/varLib/__init__.py
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@ -516,10 +516,10 @@ def _add_MVAR(font, masterModel, master_ttfs, axisTags):
# and unilaterally/arbitrarily define a sentinel value to distinguish the case
# when a post table is present in a given master simply because that's where
# the glyph names in TrueType must be stored, but the underline values are not
# meant to be used for building MVAR's deltas. The value of 0x8000 (-36768)
# meant to be used for building MVAR's deltas. The value of -0x8000 (-36768)
# the minimum FWord (int16) value, was chosen for its unlikelyhood to appear
# in real-world underline position/thickness values.
specialTags = {"unds": 0x8000, "undo": 0x8000}
specialTags = {"unds": -0x8000, "undo": -0x8000}
for tag, (tableTag, itemName) in sorted(MVAR_ENTRIES.items(), key=lambda kv: kv[1]):
if tableTag != lastTableTag:
tables = fontTable = None
@ -527,16 +527,13 @@ def _add_MVAR(font, masterModel, master_ttfs, axisTags):
fontTable = font[tableTag]
tables = []
for master in master_ttfs:
if tableTag in master:
if (
tag in specialTags
and getattr(master[tableTag], itemName) == specialTags[tag]
):
tables.append(None)
else:
tables.append(master[tableTag])
else:
if tableTag not in master or (
tag in specialTags
and getattr(master[tableTag], itemName) == specialTags[tag]
):
tables.append(None)
else:
tables.append(master[tableTag])
lastTableTag = tableTag
if tables is None:
continue