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'glyf' closure

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This commit is contained in:
Behdad Esfahbod 2013-07-23 11:17:35 -04:00
parent 29df046914
commit 0fe6a51901
1 changed files with 47 additions and 13 deletions
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60
pyotlss.py
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@ -1,7 +1,23 @@
#!/usr/bin/python
# Python OpenType Layout Subsetter
# Written by: Behdad Esfahbod
#
# Copyright 2013 Google, Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Google Author(s): Behdad Esfahbod
#
import fontTools.ttx
@ -16,8 +32,6 @@ def unique_sorted (l):
return sorted ({v:1 for v in l}.keys ())
# Subset
@add_method(fontTools.ttLib.tables.otTables.Coverage)
def subset_glyphs (self, glyphs):
"Returns ascending list of remaining coverage values."
@ -518,6 +532,19 @@ def prune (self, options):
return bool (self.names)
@add_method(fontTools.ttLib.getTableClass('glyf'))
def closure_glyphs (self, glyphs):
# XXX Rinse & repeat
components = []
for g in glyphs:
gl = self[g]
if gl.isComposite ():
for c in gl.components:
if c.glyphName not in glyphs:
components.append (c.glyphName)
return unique_sorted (glyphs + components)
drop_tables = ['BASE', 'JSTF', 'DSIG', 'EBDT', 'EBLC', 'EBSC', 'PCLT', 'LTSH', 'VDMX']
no_subset_tables = ['gasp', 'head', 'hhea', 'maxp', 'vhea', 'OS/2', 'loca', 'name']
# For now drop these
@ -558,18 +585,20 @@ if __name__ == '__main__':
# Convert to glyph names
glyphs = [g if g in names else font.getGlyphName(int(g)) for g in glyphs]
glyphs_requested = glyphs[:]
# Close over composite glyphs
if 'glyf' in font:
glyf = font['glyf']
# XXX Rinse & repeat
for g in glyphs:
gl = glyf[g]
if gl.isComposite ():
for c in gl.components:
if c.glyphName not in glyphs:
glyphs.append (c.glyphName)
if verbose:
print "Closing glyph list over 'glyf' components."
glyphs_closed = font['glyf'].closure_glyphs (glyphs)
if verbose:
print "Before: %d glyphs; after: %d glyphs" % (len (glyphs_requested), len (glyphs_closed))
else:
glyphs_closed = glyphs
del glyphs
if verbose:
print "Retaining %d glyphs: " % len (glyphs), glyphs
print "Retaining %d glyphs: " % len (glyphs_closed)
if xml:
import xmlWriter
@ -601,6 +630,10 @@ if __name__ == '__main__':
print tag, "subsetting not needed."
elif 'subset_glyphs' in vars (clazz):
table = font[tag]
if tag in ['GSUB', 'GPOS', 'GDEF', 'cmap', 'kern', 'post', 'cmap']: # What else?
glyphs = glyphs_requested
else:
glyphs = glyphs_closed
if not table.subset_glyphs (glyphs):
del font[tag]
if verbose:
@ -608,6 +641,7 @@ if __name__ == '__main__':
else:
if verbose:
print tag, "subsetted."
del glyphs
else:
if verbose:
print tag, "NOT subset; don't know how to subset."
@ -615,7 +649,7 @@ if __name__ == '__main__':
glyphOrder = font.getGlyphOrder()
glyphOrder = [g for g in glyphOrder if g in glyphs]
glyphOrder = [g for g in glyphOrder if g in glyphs_closed]
font.setGlyphOrder (glyphOrder)
font._buildReverseGlyphOrderDict ()