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More Context / ChainContext impl

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This commit is contained in:
Behdad Esfahbod 2013-07-23 15:29:40 -04:00
parent e36061ebb7
commit 398d389e4a
1 changed files with 52 additions and 10 deletions
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46
pyotlss.py
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@ -296,6 +296,7 @@ def closure_glyphs (self, glyphs, table):
@add_method(fontTools.ttLib.tables.otTables.ContextSubst, fontTools.ttLib.tables.otTables.ContextPos)
def subset_glyphs (self, glyphs):
if self.Format == 1:
# XXX Needs more work
indices = self.Coverage.subset_glyphs (glyphs)
self.SubRuleSet = [self.SubRuleSet[i] for i in indices]
self.SubRuleSetCount = len (self.SubRuleSet)
@ -303,9 +304,10 @@ def subset_glyphs (self, glyphs):
rs.SubRule = [r for r in rs.SubRule
if all (g in glyphs for g in r.Input)]
rs.SubRuleCount = len (rs.SubRule)
# Prune empty subrulesets
# TODO Prune empty subrulesets
return bool (self.SubRuleSetCount)
elif self.Format == 2:
# XXX Needs more work
return bool (self.Coverage.subset_glyphs (glyphs) and self.ClassDef.subset_glyphs (glyphs))
elif self.Format == 3:
return all (c.subset_glyphs (glyphs) for c in self.Coverage)
@ -315,6 +317,7 @@ def subset_glyphs (self, glyphs):
@add_method(fontTools.ttLib.tables.otTables.ChainContextSubst)
def closure_glyphs (self, glyphs, table):
if self.Format == 1:
return []
assert 0 # XXX
elif self.Format == 2:
assert 0 # XXX
@ -330,6 +333,7 @@ def closure_glyphs (self, glyphs, table):
@add_method(fontTools.ttLib.tables.otTables.ChainContextSubst, fontTools.ttLib.tables.otTables.ChainContextPos)
def subset_glyphs (self, glyphs):
if self.Format == 1:
# XXX Needs more work
indices = self.Coverage.subset_glyphs (glyphs)
self.ChainSubRuleSet = [self.ChainSubRuleSet[i] for i in indices]
self.ChainSubRuleSetCount = len (self.ChainSubRuleSet)
@ -337,9 +341,10 @@ def subset_glyphs (self, glyphs):
rs.ChainSubRule = [r for r in rs.ChainSubRule
if all (g in glyphs for g in r.Backtrack + r.Input + r.LookAhead)]
rs.ChainSubRuleCount = len (rs.ChainSubRule)
# Prune empty subrulesets
# TODO Prune empty subrulesets
return self.ChainSubRuleSetCount
elif self.Format == 2:
# XXX Needs more work
return self.Coverage.subset_glyphs (glyphs) and \
self.LookAheadClassDef.subset_glyphs (glyphs) and \
self.BacktrackClassDef.subset_glyphs (glyphs) and \
@ -351,23 +356,59 @@ def subset_glyphs (self, glyphs):
@add_method(fontTools.ttLib.tables.otTables.ContextSubst, fontTools.ttLib.tables.otTables.ChainContextSubst)
def subset_lookups (self, lookup_indices):
if self.Format == 1:
for rs in self.ChainSubRuleSet:
for r in rs.ChainSubRule:
r.SubstLookupRecord = [ll for ll in r.SubstLookupRecord if ll.LookupListIndex in lookup_indices]
for ll in r.SubstLookupRecord:
ll.LookupListIndex = lookup_indices.index (ll.LookupListIndex)
elif self.Format == 2:
assert 0 # XXX
elif self.Format == 3:
self.SubstLookupRecord = [ll for ll in self.SubstLookupRecord if ll.LookupListIndex in lookup_indices]
for ll in self.SubstLookupRecord:
ll.LookupListIndex = lookup_indices.index (ll.LookupListIndex)
else:
assert 0, "unknown format: %s" % self.Format
@add_method(fontTools.ttLib.tables.otTables.ContextPos, fontTools.ttLib.tables.otTables.ChainContextPos)
def subset_lookups (self, lookup_indices):
if self.Format == 1:
for rs in self.ChainSubRuleSet:
for r in rs.ChainSubRule:
r.PosLookupRecord = [ll for ll in r.PosLookupRecord if ll.LookupListIndex in lookup_indices]
for ll in r.PosLookupRecord:
ll.LookupListIndex = lookup_indices.index (ll.LookupListIndex)
elif self.Format == 2:
assert 0 # XXX
elif self.Format == 3:
self.PosLookupRecord = [ll for ll in self.PosLookupRecord if ll.LookupListIndex in lookup_indices]
for ll in self.PosLookupRecord:
ll.LookupListIndex = lookup_indices.index (ll.LookupListIndex)
else:
assert 0, "unknown format: %s" % self.Format
@add_method(fontTools.ttLib.tables.otTables.ContextSubst, fontTools.ttLib.tables.otTables.ChainContextSubst)
def collect_lookups (self):
if self.Format == 1:
return [ll.LookupListIndex for rs in self.ChainSubRuleSet for r in rs.ChainSubRule for ll in r.SubstLookupRecord]
elif self.Format == 2:
assert 0 # XXX
elif self.Format == 3:
return [ll.LookupListIndex for ll in self.SubstLookupRecord]
else:
assert 0, "unknown format: %s" % self.Format
@add_method(fontTools.ttLib.tables.otTables.ContextPos, fontTools.ttLib.tables.otTables.ChainContextPos)
def collect_lookups (self):
if self.Format == 1:
return [ll.LookupListIndex for rs in self.ChainSubRuleSet for r in rs.ChainSubRule for ll in r.PosLookupRecord]
elif self.Format == 2:
assert 0 # XXX
elif self.Format == 3:
return [ll.LookupListIndex for ll in self.PosLookupRecord]
else:
assert 0, "unknown format: %s" % self.Format
@add_method(fontTools.ttLib.tables.otTables.ExtensionSubst)
def closure_glyphs (self, glyphs, table):
@ -741,6 +782,7 @@ options_default = {
# TODO OS/2 ulUnicodeRange / ulCodePageRange?
# TODO Drop unneeded GSUB/GPOS Script/LangSys entries
# TODO Finish GSUB glyph closure
# TODO Avoid recursing too much
# TODO Text direction considerations
# TODO Text script / language considerations