92 lines
2.9 KiB
Python
92 lines
2.9 KiB
Python
def lookupKerningValue(
|
|
pair, kerning, groups, fallback=0, glyphToFirstGroup=None, glyphToSecondGroup=None
|
|
):
|
|
"""
|
|
Note: This expects kerning to be a flat dictionary
|
|
of kerning pairs, not the nested structure used
|
|
in kerning.plist.
|
|
|
|
>>> groups = {
|
|
... "public.kern1.O" : ["O", "D", "Q"],
|
|
... "public.kern2.E" : ["E", "F"]
|
|
... }
|
|
>>> kerning = {
|
|
... ("public.kern1.O", "public.kern2.E") : -100,
|
|
... ("public.kern1.O", "F") : -200,
|
|
... ("D", "F") : -300
|
|
... }
|
|
>>> lookupKerningValue(("D", "F"), kerning, groups)
|
|
-300
|
|
>>> lookupKerningValue(("O", "F"), kerning, groups)
|
|
-200
|
|
>>> lookupKerningValue(("O", "E"), kerning, groups)
|
|
-100
|
|
>>> lookupKerningValue(("O", "O"), kerning, groups)
|
|
0
|
|
>>> lookupKerningValue(("E", "E"), kerning, groups)
|
|
0
|
|
>>> lookupKerningValue(("E", "O"), kerning, groups)
|
|
0
|
|
>>> lookupKerningValue(("X", "X"), kerning, groups)
|
|
0
|
|
>>> lookupKerningValue(("public.kern1.O", "public.kern2.E"),
|
|
... kerning, groups)
|
|
-100
|
|
>>> lookupKerningValue(("public.kern1.O", "F"), kerning, groups)
|
|
-200
|
|
>>> lookupKerningValue(("O", "public.kern2.E"), kerning, groups)
|
|
-100
|
|
>>> lookupKerningValue(("public.kern1.X", "public.kern2.X"), kerning, groups)
|
|
0
|
|
"""
|
|
# quickly check to see if the pair is in the kerning dictionary
|
|
if pair in kerning:
|
|
return kerning[pair]
|
|
# create glyph to group mapping
|
|
if glyphToFirstGroup is not None:
|
|
assert glyphToSecondGroup is not None
|
|
if glyphToSecondGroup is not None:
|
|
assert glyphToFirstGroup is not None
|
|
if glyphToFirstGroup is None:
|
|
glyphToFirstGroup = {}
|
|
glyphToSecondGroup = {}
|
|
for group, groupMembers in groups.items():
|
|
if group.startswith("public.kern1."):
|
|
for glyph in groupMembers:
|
|
glyphToFirstGroup[glyph] = group
|
|
elif group.startswith("public.kern2."):
|
|
for glyph in groupMembers:
|
|
glyphToSecondGroup[glyph] = group
|
|
# get group names and make sure first and second are glyph names
|
|
first, second = pair
|
|
firstGroup = secondGroup = None
|
|
if first.startswith("public.kern1."):
|
|
firstGroup = first
|
|
first = None
|
|
else:
|
|
firstGroup = glyphToFirstGroup.get(first)
|
|
if second.startswith("public.kern2."):
|
|
secondGroup = second
|
|
second = None
|
|
else:
|
|
secondGroup = glyphToSecondGroup.get(second)
|
|
# make an ordered list of pairs to look up
|
|
pairs = [
|
|
(first, second),
|
|
(first, secondGroup),
|
|
(firstGroup, second),
|
|
(firstGroup, secondGroup),
|
|
]
|
|
# look up the pairs and return any matches
|
|
for pair in pairs:
|
|
if pair in kerning:
|
|
return kerning[pair]
|
|
# use the fallback value
|
|
return fallback
|
|
|
|
|
|
if __name__ == "__main__":
|
|
import doctest
|
|
|
|
doctest.testmod()
|