def add_gsub_to_font(fontfile):
"""Adds an empty GSUB table to a font."""
font = ttLib.TTFont(fontfile)
gsub_table = ttLib.getTableClass('GSUB')('GSUB')
gsub_table.table = otTables.GSUB()
gsub_table.table.Version = 1.0
gsub_table.table.ScriptList = otTables.ScriptList()
gsub_table.table.ScriptCount = 1
gsub_table.table.LookupList = otTables.LookupList()
gsub_table.table.LookupList.LookupCount = 0
gsub_table.table.LookupList.Lookup = []
gsub_table.table.FeatureList = otTables.FeatureList()
gsub_table.table.FeatureList.FeatureCount = 0
gsub_table.table.LookupList.FeatureRecord = []
script_record = otTables.ScriptRecord()
script_record.ScriptTag = get_opentype_script_tag(fontfile)
script_record.Script = otTables.Script()
script_record.Script.LangSysCount = 0
script_record.Script.LangSysRecord = []
default_lang_sys = otTables.DefaultLangSys()
default_lang_sys.FeatureIndex = []
default_lang_sys.FeatureCount = 0
default_lang_sys.LookupOrder = None
default_lang_sys.ReqFeatureIndex = 65535
script_record.Script.DefaultLangSys = default_lang_sys
gsub_table.table.ScriptList.ScriptRecord = [script_record]
font['GSUB'] = gsub_table
target_file = tempfile.gettempdir() + '/' + os.path.basename(fontfile)
font.save(target_file)
return target_file
def buildGSUB():
"""Build a GSUB table from scratch."""
fontTable = newTable("GSUB")
gsub = fontTable.table = ot.GSUB()
gsub.Version = 0x00010001 # allow gsub.FeatureVariations
gsub.ScriptList = ot.ScriptList()
gsub.ScriptList.ScriptRecord = []
gsub.FeatureList = ot.FeatureList()
gsub.FeatureList.FeatureRecord = []
gsub.LookupList = ot.LookupList()
gsub.LookupList.Lookup = []
srec = ot.ScriptRecord()
srec.ScriptTag = 'DFLT'
srec.Script = ot.Script()
srec.Script.DefaultLangSys = None
srec.Script.LangSysRecord = []
langrec = ot.LangSysRecord()
langrec.LangSys = ot.LangSys()
langrec.LangSys.ReqFeatureIndex = 0xFFFF
langrec.LangSys.FeatureIndex = [0]
srec.Script.DefaultLangSys = langrec.LangSys
gsub.ScriptList.ScriptRecord.append(srec)
gsub.FeatureVariations = None
return fontTable
def create_simple_gsub(lookups, script='DFLT', feature='ccmp'):
"""Create a simple GSUB table."""
gsub_class = ttLib.getTableClass('GSUB')
gsub = gsub_class('GSUB')
gsub.table = otTables.GSUB()
gsub.table.Version = 1.0
gsub.table.ScriptList = create_script_list(script)
gsub.table.FeatureList = create_feature_list(feature, len(lookups))
gsub.table.LookupList = create_lookup_list(lookups)
return gsub
