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Hack for subsetting commonly used ligatures, pending proper parsing of the GSUB table

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Kovid Goyal 2012-11-09 17:32:16 +05:30
parent bd9fd5485b
commit 891f362385
1 changed files with 11 additions and 0 deletions
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11
src/calibre/utils/fonts/sfnt/subset.py
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@ -76,6 +76,17 @@ def subset(raw, individual_chars, ranges=()):
for r in ranges: for r in ranges:
chars += list(xrange(ord(r[0]), ord(r[1])+1)) chars += list(xrange(ord(r[0]), ord(r[1])+1))
# Hack pending parsing of the GSUB table, manually add in a few common
# ligatures
ligatures = {'AE':'Æ', 'ae':'æ', 'OE':'Œ', 'IJ':'IJ', 'ij':'ij', 'ue':'ᵫ',
'ff':'ff', 'fi':'fi', 'fl':'fl', 'ffi':'ffi', 'ffl':'ffl', 'st':'st'}
all_chars = set(chars)
for ichars, lig in ligatures.iteritems():
ichars = frozenset(map(ord, ichars))
if ichars.issubset(all_chars) and ord(lig) not in all_chars:
all_chars.add(ord(lig))
chars.append(ord(lig))
sfnt = Sfnt(raw) sfnt = Sfnt(raw)
old_sizes = sfnt.sizes() old_sizes = sfnt.sizes()