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Implement LookupList, FeatureList, ScriptList backwards pruning

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This commit is contained in:
Behdad Esfahbod 2013-07-22 11:46:50 -04:00
parent 9d02c2db00
commit 77cda418fa
1 changed files with 54 additions and 8 deletions
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62
pyotlss.py
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@ -220,19 +220,65 @@ def subset (self, glyphs):
@add_method(fontTools.ttLib.tables.otTables.LookupList)
def subset (self, glyphs):
for l in self.Lookup:
l.subset (glyphs)
"Returns the indices of nonempty lookups."
return [i for (i,l) in enumerate (self.Lookup) if l.subset (glyphs)]
@add_method(fontTools.ttLib.tables.otTables.LookupList)
def subset_lookups (self, lookup_indices):
self.Lookup = [self.Lookup[i] for i in lookup_indices]
self.LookupCount = len (self.Lookup)
@add_method(fontTools.ttLib.tables.otTables.Feature)
def subset_lookups (self, lookup_indices):
self.LookupListIndex = [l for l in self.LookupListIndex if l in lookup_indices]
# Now map them.
self.LookupListIndex = [lookup_indices.index (l) for l in self.LookupListIndex]
self.LookupCount = len (self.LookupListIndex)
return self.LookupCount
@add_method(fontTools.ttLib.tables.otTables.FeatureList)
def subset_lookups (self, lookup_indices):
"Returns the indices of nonempty features."
feature_indices = [i for (i,f) in enumerate (self.FeatureRecord) if f.Feature.subset_lookups (lookup_indices)]
self.FeatureRecord = [self.FeatureRecord[i] for i in feature_indices]
self.FeatureCount = len (self.FeatureRecord)
return feature_indices
@add_method(fontTools.ttLib.tables.otTables.DefaultLangSys, fontTools.ttLib.tables.otTables.LangSys)
def subset_features (self, feature_indices):
if self.ReqFeatureIndex not in feature_indices:
self.ReqFeatureIndex = 65535
self.FeatureIndex = [f for f in self.FeatureIndex if f in feature_indices]
self.FeatureCount = len (self.FeatureIndex)
return self.FeatureCount
@add_method(fontTools.ttLib.tables.otTables.Script)
def subset_features (self, feature_indices):
if self.DefaultLangSys and not self.DefaultLangSys.subset_features (feature_indices):
self.DefaultLangSys = None
self.LangSysRecord = [l for l in self.LangSysRecord if l.LangSys.subset_features (feature_indices)]
self.LangSysCount = len (self.LangSysRecord)
return self.LangSysCount
@add_method(fontTools.ttLib.tables.otTables.ScriptList)
def subset_features (self, feature_indices):
self.ScriptRecord = [s for s in self.ScriptRecord if s.Script.subset_features (feature_indices)]
self.ScriptCount = len (self.ScriptRecord)
return self.ScriptCount
@add_method(fontTools.ttLib.tables.otTables.GSUB, fontTools.ttLib.tables.otTables.GPOS)
def subset (self, glyphs):
self.LookupList.subset (glyphs)
# TODO Prune featurelists
#print vars (self.ScriptList.ScriptRecord[0].Script.LangSysRecord[0].LangSys)
#self.ScriptList.ScriptCount = len (self.ScriptList.ScriptRecord)
#self.FeatureList.FeatureCount = len (self.FeatureList.FeatureRecord)
lookup_indices = self.LookupList.subset (glyphs)
self.subset_lookups (lookup_indices)
return True # Retain the possibly empty table
@add_method(fontTools.ttLib.tables.otTables.GSUB, fontTools.ttLib.tables.otTables.GPOS)
def subset_lookups (self, lookup_indices):
"Retrains specified lookups, then removes empty features, language systems, and scripts."
self.LookupList.subset_lookups (lookup_indices)
feature_indices = self.FeatureList.subset_lookups (lookup_indices)
self.ScriptList.subset_features (feature_indices)
@add_method(fontTools.ttLib.tables.otTables.GDEF)
def subset (self, glyphs):
if self.LigCaretList:
@ -281,4 +327,4 @@ if __name__ == '__main__':
if not font[tag].table.subset (glyphs):
del font[tag]
font.save (fontfile + '.subset.ttf')
font.save (fontfile + '.subset')