17700bf926
Apparently the SIL Gentium fonts have wrong sorting in Coverage tables. That's broken by the spec, but shapers still work with such fonts. So, we warn when reading, and when writing, such out-of-order coverage tables.
778 lines
24 KiB
Python
778 lines
24 KiB
Python
"""fontTools.ttLib.tables.otTables -- A collection of classes representing the various
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OpenType subtables.
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Most are constructed upon import from data in otData.py, all are populated with
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converter objects from otConverters.py.
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"""
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import operator
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from otBase import BaseTable, FormatSwitchingBaseTable
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from types import TupleType
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import warnings
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class LookupOrder(BaseTable):
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"""Dummy class; this table isn't defined, but is used, and is always NULL."""
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class FeatureParams(BaseTable):
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"""This class has been used by Adobe, but but this one implementation was done wrong.
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No other use has been made, becuase there is no way to know how to interpret
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the data at the offset.. For now, if we see one, just skip the data on
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decompiling and dumping to XML. """
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# XXX The above is no longer true; the 'size' feature uses FeatureParams now.
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def __init__(self):
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BaseTable.__init__(self)
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self.converters = []
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class Coverage(FormatSwitchingBaseTable):
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# manual implementation to get rid of glyphID dependencies
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def postRead(self, rawTable, font):
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if self.Format == 1:
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self.glyphs = rawTable["GlyphArray"]
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elif self.Format == 2:
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glyphs = self.glyphs = []
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ranges = rawTable["RangeRecord"]
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glyphOrder = font.getGlyphOrder()
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# Some SIL fonts have coverage entries that don't have sorted
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# StartCoverageIndex. If it is so, fixup and warn. We undo
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# this when writing font out.
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sorted_ranges = sorted(ranges, cmp=lambda a,b: cmp(a.StartCoverageIndex,b.StartCoverageIndex))
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if ranges != sorted_ranges:
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warnings.warn("GSUB/GPOS Coverage is not sorted by glyph ids.")
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ranges = sorted_ranges
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del sorted_ranges
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for r in ranges:
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assert r.StartCoverageIndex == len(glyphs), \
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(r.StartCoverageIndex, len(glyphs))
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start = r.Start
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end = r.End
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try:
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startID = font.getGlyphID(start, requireReal=1)
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except KeyError:
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warnings.warn("Coverage table has start glyph ID out of range: %s." % start)
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continue
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try:
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endID = font.getGlyphID(end, requireReal=1)
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except KeyError:
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warnings.warn("Coverage table has end glyph ID out of range: %s." % end)
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endID = len(glyphOrder)
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glyphs.append(start)
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rangeList = [glyphOrder[glyphID] for glyphID in range(startID + 1, endID) ]
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glyphs += rangeList
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if start != end and endID < len(glyphOrder):
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glyphs.append(end)
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else:
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assert 0, "unknown format: %s" % self.Format
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def preWrite(self, font):
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glyphs = getattr(self, "glyphs", None)
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if glyphs is None:
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glyphs = self.glyphs = []
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format = 1
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rawTable = {"GlyphArray": glyphs}
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getGlyphID = font.getGlyphID
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if glyphs:
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# find out whether Format 2 is more compact or not
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glyphIDs = [getGlyphID(glyphName) for glyphName in glyphs ]
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brokenOrder = sorted(glyphIDs) != glyphIDs
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last = glyphIDs[0]
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ranges = [[last]]
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for glyphID in glyphIDs[1:]:
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if glyphID != last + 1:
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ranges[-1].append(last)
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ranges.append([glyphID])
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last = glyphID
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ranges[-1].append(last)
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if brokenOrder or len(ranges) * 3 < len(glyphs): # 3 words vs. 1 word
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# Format 2 is more compact
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index = 0
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for i in range(len(ranges)):
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start, end = ranges[i]
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r = RangeRecord()
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r.StartID = start
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r.Start = font.getGlyphName(start)
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r.End = font.getGlyphName(end)
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r.StartCoverageIndex = index
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ranges[i] = r
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index = index + end - start + 1
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if brokenOrder:
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warnings.warn("GSUB/GPOS Coverage is not sorted by glyph ids.")
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ranges.sort(cmp=lambda a,b: cmp(a.StartID,b.StartID))
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for r in ranges:
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del r.StartID
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format = 2
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rawTable = {"RangeRecord": ranges}
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#else:
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# fallthrough; Format 1 is more compact
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self.Format = format
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return rawTable
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def toXML2(self, xmlWriter, font):
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for glyphName in getattr(self, "glyphs", []):
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xmlWriter.simpletag("Glyph", value=glyphName)
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xmlWriter.newline()
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def fromXML(self, (name, attrs, content), font):
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glyphs = getattr(self, "glyphs", None)
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if glyphs is None:
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glyphs = []
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self.glyphs = glyphs
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glyphs.append(attrs["value"])
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class LookupList(BaseTable):
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def preCompile(self):
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""" This function is used to optimize writing out extension subtables. This is useful
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when a font has been read in, modified, and we are now writing out a new version. If the
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the extension subtables have not been touched (proof being that they have not been decompiled)
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then we can write them out using the original data, and do not have to recompile them. This can save
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20-30% of the compile time for fonts with large extension tables, such as Japanese Pro fonts."""
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if hasattr(self, 'LookupCount'): #not defined if loading from xml
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lookupCount = self.LookupCount
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else:
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return # The optimization of not recompiling extension lookup subtables is not possible
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# when reading from XML.
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liRange = range(lookupCount)
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extTables = []
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for li in liRange:
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lookup = self.Lookup[li]
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if hasattr(lookup, 'SubTableCount'): #not defined if loading from xml
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subtableCount = lookup.SubTableCount
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else:
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subtableCount = len(lookup.SubTable)
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siRange = range(subtableCount)
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for si in siRange:
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subtable = lookup.SubTable[si]
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if hasattr(subtable, 'ExtSubTable'):
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extTable = subtable.ExtSubTable
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extTables.append([extTable.start, extTable] )
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# Since offsets in one subtable can and do point forward into later
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# subtables, we can afford to simply copy data only for the last subtables
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# which were not decompiled. So we start figuring out the
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# data segments starting with the last subtTable, and work our way towards
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# the first subtable, and then quit as soon as we see a subtable that was decompiled.
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if extTables:
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extTables.sort()
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extTables.reverse()
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lastTable = extTables[0][1]
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if lastTable.compileStatus == 1:
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lastTable.end = len(lastTable.reader.data)
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lastTable.compileStatus = 3
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for i in range(1, len(extTables)):
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extTable = extTables[i][1]
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if extTable.compileStatus != 1:
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break
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extTable.end = lastTable.start
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extTable.compileStatus = 3
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lastTable = extTable
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def doModulo(value):
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if value < 0:
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return value + 65536
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return value
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class SingleSubst(FormatSwitchingBaseTable):
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def postRead(self, rawTable, font):
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mapping = {}
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input = _getGlyphsFromCoverageTable(rawTable["Coverage"])
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lenMapping = len(input)
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if self.Format == 1:
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delta = rawTable["DeltaGlyphID"]
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inputGIDS = [ font.getGlyphID(name) for name in input ]
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inputGIDS = map(doModulo, inputGIDS)
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outGIDS = [ glyphID + delta for glyphID in inputGIDS ]
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outGIDS = map(doModulo, outGIDS)
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outNames = [ font.getGlyphName(glyphID) for glyphID in outGIDS ]
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map(operator.setitem, [mapping]*lenMapping, input, outNames)
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elif self.Format == 2:
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assert len(input) == rawTable["GlyphCount"], \
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"invalid SingleSubstFormat2 table"
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subst = rawTable["Substitute"]
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map(operator.setitem, [mapping]*lenMapping, input, subst)
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else:
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assert 0, "unknown format: %s" % self.Format
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self.mapping = mapping
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def preWrite(self, font):
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mapping = getattr(self, "mapping", None)
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if mapping is None:
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mapping = self.mapping = {}
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items = mapping.items()
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getGlyphID = font.getGlyphID
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gidItems = [(getGlyphID(item[0]), getGlyphID(item[1])) for item in items]
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sortableItems = zip(gidItems, items)
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sortableItems.sort()
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# figure out format
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format = 2
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delta = None
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for inID, outID in gidItems:
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if delta is None:
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delta = outID - inID
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else:
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if delta != outID - inID:
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break
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else:
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format = 1
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rawTable = {}
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self.Format = format
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cov = Coverage()
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input = [ item [1][0] for item in sortableItems]
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subst = [ item [1][1] for item in sortableItems]
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cov.glyphs = input
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rawTable["Coverage"] = cov
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if format == 1:
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assert delta is not None
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rawTable["DeltaGlyphID"] = delta
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else:
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rawTable["Substitute"] = subst
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return rawTable
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def toXML2(self, xmlWriter, font):
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items = self.mapping.items()
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items.sort()
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for inGlyph, outGlyph in items:
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xmlWriter.simpletag("Substitution",
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[("in", inGlyph), ("out", outGlyph)])
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xmlWriter.newline()
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def fromXML(self, (name, attrs, content), font):
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mapping = getattr(self, "mapping", None)
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if mapping is None:
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mapping = {}
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self.mapping = mapping
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mapping[attrs["in"]] = attrs["out"]
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class ClassDef(FormatSwitchingBaseTable):
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def postRead(self, rawTable, font):
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classDefs = {}
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getGlyphName = font.getGlyphName
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if self.Format == 1:
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start = rawTable["StartGlyph"]
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classList = rawTable["ClassValueArray"]
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lenList = len(classList)
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glyphID = font.getGlyphID(start)
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gidList = range(glyphID, glyphID + len(classList))
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keyList = [getGlyphName(glyphID) for glyphID in gidList]
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map(operator.setitem, [classDefs]*lenList, keyList, classList)
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elif self.Format == 2:
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records = rawTable["ClassRangeRecord"]
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for rec in records:
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start = rec.Start
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end = rec.End
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cls = rec.Class
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classDefs[start] = cls
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glyphIDs = range(font.getGlyphID(start) + 1, font.getGlyphID(end))
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lenList = len(glyphIDs)
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keyList = [getGlyphName(glyphID) for glyphID in glyphIDs]
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map(operator.setitem, [classDefs]*lenList, keyList, [cls]*lenList)
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classDefs[end] = cls
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else:
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assert 0, "unknown format: %s" % self.Format
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self.classDefs = classDefs
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def preWrite(self, font):
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classDefs = getattr(self, "classDefs", None)
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if classDefs is None:
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classDefs = self.classDefs = {}
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items = classDefs.items()
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getGlyphID = font.getGlyphID
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for i in range(len(items)):
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glyphName, cls = items[i]
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items[i] = getGlyphID(glyphName), glyphName, cls
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items.sort()
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if items:
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last, lastName, lastCls = items[0]
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rec = ClassRangeRecord()
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rec.Start = lastName
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rec.Class = lastCls
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ranges = [rec]
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for glyphID, glyphName, cls in items[1:]:
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if glyphID != last + 1 or cls != lastCls:
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rec.End = lastName
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rec = ClassRangeRecord()
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rec.Start = glyphName
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rec.Class = cls
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ranges.append(rec)
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last = glyphID
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lastName = glyphName
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lastCls = cls
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rec.End = lastName
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else:
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ranges = []
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self.Format = 2 # currently no support for Format 1
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return {"ClassRangeRecord": ranges}
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def toXML2(self, xmlWriter, font):
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items = self.classDefs.items()
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items.sort()
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for glyphName, cls in items:
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xmlWriter.simpletag("ClassDef", [("glyph", glyphName), ("class", cls)])
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xmlWriter.newline()
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def fromXML(self, (name, attrs, content), font):
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classDefs = getattr(self, "classDefs", None)
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if classDefs is None:
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classDefs = {}
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self.classDefs = classDefs
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classDefs[attrs["glyph"]] = int(attrs["class"])
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class AlternateSubst(FormatSwitchingBaseTable):
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def postRead(self, rawTable, font):
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alternates = {}
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if self.Format == 1:
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input = _getGlyphsFromCoverageTable(rawTable["Coverage"])
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alts = rawTable["AlternateSet"]
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if len(input) != len(alts):
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assert len(input) == len(alts)
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for i in range(len(input)):
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alternates[input[i]] = alts[i].Alternate
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else:
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assert 0, "unknown format: %s" % self.Format
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self.alternates = alternates
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def preWrite(self, font):
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self.Format = 1
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alternates = getattr(self, "alternates", None)
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if alternates is None:
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alternates = self.alternates = {}
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items = alternates.items()
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for i in range(len(items)):
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glyphName, set = items[i]
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items[i] = font.getGlyphID(glyphName), glyphName, set
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items.sort()
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cov = Coverage()
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cov.glyphs = [ item[1] for item in items]
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alternates = []
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setList = [ item[-1] for item in items]
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for set in setList:
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alts = AlternateSet()
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alts.Alternate = set
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alternates.append(alts)
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# a special case to deal with the fact that several hundred Adobe Japan1-5
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# CJK fonts will overflow an offset if the coverage table isn't pushed to the end.
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# Also useful in that when splitting a sub-table because of an offset overflow
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# I don't need to calculate the change in the subtable offset due to the change in the coverage table size.
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# Allows packing more rules in subtable.
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self.sortCoverageLast = 1
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return {"Coverage": cov, "AlternateSet": alternates}
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def toXML2(self, xmlWriter, font):
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items = self.alternates.items()
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items.sort()
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for glyphName, alternates in items:
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xmlWriter.begintag("AlternateSet", glyph=glyphName)
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xmlWriter.newline()
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for alt in alternates:
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xmlWriter.simpletag("Alternate", glyph=alt)
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xmlWriter.newline()
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xmlWriter.endtag("AlternateSet")
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xmlWriter.newline()
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def fromXML(self, (name, attrs, content), font):
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alternates = getattr(self, "alternates", None)
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if alternates is None:
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alternates = {}
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self.alternates = alternates
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glyphName = attrs["glyph"]
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set = []
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alternates[glyphName] = set
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for element in content:
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if type(element) != TupleType:
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continue
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name, attrs, content = element
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set.append(attrs["glyph"])
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class LigatureSubst(FormatSwitchingBaseTable):
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def postRead(self, rawTable, font):
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ligatures = {}
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if self.Format == 1:
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input = rawTable["Coverage"].glyphs
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ligSets = rawTable["LigatureSet"]
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assert len(input) == len(ligSets)
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for i in range(len(input)):
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ligatures[input[i]] = ligSets[i].Ligature
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else:
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assert 0, "unknown format: %s" % self.Format
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self.ligatures = ligatures
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def preWrite(self, font):
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ligatures = getattr(self, "ligatures", None)
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if ligatures is None:
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ligatures = self.ligatures = {}
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items = ligatures.items()
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for i in range(len(items)):
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glyphName, set = items[i]
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items[i] = font.getGlyphID(glyphName), glyphName, set
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items.sort()
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cov = Coverage()
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cov.glyphs = [ item[1] for item in items]
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ligSets = []
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setList = [ item[-1] for item in items ]
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for set in setList:
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ligSet = LigatureSet()
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ligs = ligSet.Ligature = []
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for lig in set:
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ligs.append(lig)
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ligSets.append(ligSet)
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# Useful in that when splitting a sub-table because of an offset overflow
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# I don't need to calculate the change in subtabl offset due to the coverage table size.
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# Allows packing more rules in subtable.
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self.sortCoverageLast = 1
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return {"Coverage": cov, "LigatureSet": ligSets}
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def toXML2(self, xmlWriter, font):
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items = self.ligatures.items()
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items.sort()
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for glyphName, ligSets in items:
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xmlWriter.begintag("LigatureSet", glyph=glyphName)
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xmlWriter.newline()
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for lig in ligSets:
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xmlWriter.simpletag("Ligature", glyph=lig.LigGlyph,
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components=",".join(lig.Component))
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xmlWriter.newline()
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xmlWriter.endtag("LigatureSet")
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xmlWriter.newline()
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def fromXML(self, (name, attrs, content), font):
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ligatures = getattr(self, "ligatures", None)
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if ligatures is None:
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ligatures = {}
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self.ligatures = ligatures
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glyphName = attrs["glyph"]
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ligs = []
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ligatures[glyphName] = ligs
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for element in content:
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if type(element) != TupleType:
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continue
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name, attrs, content = element
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lig = Ligature()
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lig.LigGlyph = attrs["glyph"]
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lig.Component = attrs["components"].split(",")
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ligs.append(lig)
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#
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# For each subtable format there is a class. However, we don't really distinguish
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# between "field name" and "format name": often these are the same. Yet there's
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# a whole bunch of fields with different names. The following dict is a mapping
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# from "format name" to "field name". _buildClasses() uses this to create a
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# subclass for each alternate field name.
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#
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_equivalents = {
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'MarkArray': ("Mark1Array",),
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'LangSys': ('DefaultLangSys',),
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'Coverage': ('MarkCoverage', 'BaseCoverage', 'LigatureCoverage', 'Mark1Coverage',
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'Mark2Coverage', 'BacktrackCoverage', 'InputCoverage',
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'LookAheadCoverage'),
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'ClassDef': ('ClassDef1', 'ClassDef2', 'BacktrackClassDef', 'InputClassDef',
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'LookAheadClassDef', 'GlyphClassDef', 'MarkAttachClassDef'),
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'Anchor': ('EntryAnchor', 'ExitAnchor', 'BaseAnchor', 'LigatureAnchor',
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'Mark2Anchor', 'MarkAnchor'),
|
|
'Device': ('XPlaDevice', 'YPlaDevice', 'XAdvDevice', 'YAdvDevice',
|
|
'XDeviceTable', 'YDeviceTable', 'DeviceTable'),
|
|
'Axis': ('HorizAxis', 'VertAxis',),
|
|
'MinMax': ('DefaultMinMax',),
|
|
'BaseCoord': ('MinCoord', 'MaxCoord',),
|
|
'JstfLangSys': ('DefJstfLangSys',),
|
|
'JstfGSUBModList': ('ShrinkageEnableGSUB', 'ShrinkageDisableGSUB', 'ExtensionEnableGSUB',
|
|
'ExtensionDisableGSUB',),
|
|
'JstfGPOSModList': ('ShrinkageEnableGPOS', 'ShrinkageDisableGPOS', 'ExtensionEnableGPOS',
|
|
'ExtensionDisableGPOS',),
|
|
'JstfMax': ('ShrinkageJstfMax', 'ExtensionJstfMax',),
|
|
}
|
|
|
|
#
|
|
# OverFlow logic, to automatically create ExtensionLookups
|
|
# XXX This should probably move to otBase.py
|
|
#
|
|
|
|
def fixLookupOverFlows(ttf, overflowRecord):
|
|
""" Either the offset from the LookupList to a lookup overflowed, or
|
|
an offset from a lookup to a subtable overflowed.
|
|
The table layout is:
|
|
GPSO/GUSB
|
|
Script List
|
|
Feature List
|
|
LookUpList
|
|
Lookup[0] and contents
|
|
SubTable offset list
|
|
SubTable[0] and contents
|
|
...
|
|
SubTable[n] and contents
|
|
...
|
|
Lookup[n] and contents
|
|
SubTable offset list
|
|
SubTable[0] and contents
|
|
...
|
|
SubTable[n] and contents
|
|
If the offset to a lookup overflowed (SubTableIndex == None)
|
|
we must promote the *previous* lookup to an Extension type.
|
|
If the offset from a lookup to subtable overflowed, then we must promote it
|
|
to an Extension Lookup type.
|
|
"""
|
|
ok = 0
|
|
lookupIndex = overflowRecord.LookupListIndex
|
|
if (overflowRecord.SubTableIndex == None):
|
|
lookupIndex = lookupIndex - 1
|
|
if lookupIndex < 0:
|
|
return ok
|
|
if overflowRecord.tableType == 'GSUB':
|
|
extType = 7
|
|
elif overflowRecord.tableType == 'GPOS':
|
|
extType = 9
|
|
|
|
lookups = ttf[overflowRecord.tableType].table.LookupList.Lookup
|
|
lookup = lookups[lookupIndex]
|
|
# If the previous lookup is an extType, look further back. Very unlikely, but possible.
|
|
while lookup.LookupType == extType:
|
|
lookupIndex = lookupIndex -1
|
|
if lookupIndex < 0:
|
|
return ok
|
|
lookup = lookups[lookupIndex]
|
|
|
|
for si in range(len(lookup.SubTable)):
|
|
subTable = lookup.SubTable[si]
|
|
extSubTableClass = lookupTypes[overflowRecord.tableType][extType]
|
|
extSubTable = extSubTableClass()
|
|
extSubTable.Format = 1
|
|
extSubTable.ExtensionLookupType = lookup.LookupType
|
|
extSubTable.ExtSubTable = subTable
|
|
lookup.SubTable[si] = extSubTable
|
|
lookup.LookupType = extType
|
|
ok = 1
|
|
return ok
|
|
|
|
def splitAlternateSubst(oldSubTable, newSubTable, overflowRecord):
|
|
ok = 1
|
|
newSubTable.Format = oldSubTable.Format
|
|
if hasattr(oldSubTable, 'sortCoverageLast'):
|
|
newSubTable.sortCoverageLast = oldSubTable.sortCoverageLast
|
|
|
|
oldAlts = oldSubTable.alternates.items()
|
|
oldAlts.sort()
|
|
oldLen = len(oldAlts)
|
|
|
|
if overflowRecord.itemName in [ 'Coverage', 'RangeRecord']:
|
|
# Coverage table is written last. overflow is to or within the
|
|
# the coverage table. We will just cut the subtable in half.
|
|
newLen = int(oldLen/2)
|
|
|
|
elif overflowRecord.itemName == 'AlternateSet':
|
|
# We just need to back up by two items
|
|
# from the overflowed AlternateSet index to make sure the offset
|
|
# to the Coverage table doesn't overflow.
|
|
newLen = overflowRecord.itemIndex - 1
|
|
|
|
newSubTable.alternates = {}
|
|
for i in range(newLen, oldLen):
|
|
item = oldAlts[i]
|
|
key = item[0]
|
|
newSubTable.alternates[key] = item[1]
|
|
del oldSubTable.alternates[key]
|
|
|
|
|
|
return ok
|
|
|
|
|
|
def splitLigatureSubst(oldSubTable, newSubTable, overflowRecord):
|
|
ok = 1
|
|
newSubTable.Format = oldSubTable.Format
|
|
oldLigs = oldSubTable.ligatures.items()
|
|
oldLigs.sort()
|
|
oldLen = len(oldLigs)
|
|
|
|
if overflowRecord.itemName in [ 'Coverage', 'RangeRecord']:
|
|
# Coverage table is written last. overflow is to or within the
|
|
# the coverage table. We will just cut the subtable in half.
|
|
newLen = int(oldLen/2)
|
|
|
|
elif overflowRecord.itemName == 'LigatureSet':
|
|
# We just need to back up by two items
|
|
# from the overflowed AlternateSet index to make sure the offset
|
|
# to the Coverage table doesn't overflow.
|
|
newLen = overflowRecord.itemIndex - 1
|
|
|
|
newSubTable.ligatures = {}
|
|
for i in range(newLen, oldLen):
|
|
item = oldLigs[i]
|
|
key = item[0]
|
|
newSubTable.ligatures[key] = item[1]
|
|
del oldSubTable.ligatures[key]
|
|
|
|
return ok
|
|
|
|
|
|
splitTable = { 'GSUB': {
|
|
# 1: splitSingleSubst,
|
|
# 2: splitMultipleSubst,
|
|
3: splitAlternateSubst,
|
|
4: splitLigatureSubst,
|
|
# 5: splitContextSubst,
|
|
# 6: splitChainContextSubst,
|
|
# 7: splitExtensionSubst,
|
|
# 8: splitReverseChainSingleSubst,
|
|
},
|
|
'GPOS': {
|
|
# 1: splitSinglePos,
|
|
# 2: splitPairPos,
|
|
# 3: splitCursivePos,
|
|
# 4: splitMarkBasePos,
|
|
# 5: splitMarkLigPos,
|
|
# 6: splitMarkMarkPos,
|
|
# 7: splitContextPos,
|
|
# 8: splitChainContextPos,
|
|
# 9: splitExtensionPos,
|
|
}
|
|
|
|
}
|
|
|
|
def fixSubTableOverFlows(ttf, overflowRecord):
|
|
"""
|
|
An offset has overflowed within a sub-table. We need to divide this subtable into smaller parts.
|
|
"""
|
|
ok = 0
|
|
table = ttf[overflowRecord.tableType].table
|
|
lookup = table.LookupList.Lookup[overflowRecord.LookupListIndex]
|
|
subIndex = overflowRecord.SubTableIndex
|
|
subtable = lookup.SubTable[subIndex]
|
|
|
|
if hasattr(subtable, 'ExtSubTable'):
|
|
# We split the subtable of the Extension table, and add a new Extension table
|
|
# to contain the new subtable.
|
|
|
|
subTableType = subtable.ExtensionLookupType
|
|
extSubTable = subtable
|
|
subtable = extSubTable.ExtSubTable
|
|
newExtSubTableClass = lookupTypes[overflowRecord.tableType][lookup.LookupType]
|
|
newExtSubTable = newExtSubTableClass()
|
|
newExtSubTable.Format = extSubTable.Format
|
|
newExtSubTable.ExtensionLookupType = extSubTable.ExtensionLookupType
|
|
lookup.SubTable.insert(subIndex + 1, newExtSubTable)
|
|
|
|
newSubTableClass = lookupTypes[overflowRecord.tableType][subTableType]
|
|
newSubTable = newSubTableClass()
|
|
newExtSubTable.ExtSubTable = newSubTable
|
|
else:
|
|
subTableType = lookup.LookupType
|
|
newSubTableClass = lookupTypes[overflowRecord.tableType][subTableType]
|
|
newSubTable = newSubTableClass()
|
|
lookup.SubTable.insert(subIndex + 1, newSubTable)
|
|
|
|
if hasattr(lookup, 'SubTableCount'): # may not be defined yet.
|
|
lookup.SubTableCount = lookup.SubTableCount + 1
|
|
|
|
try:
|
|
splitFunc = splitTable[overflowRecord.tableType][subTableType]
|
|
except KeyError:
|
|
return ok
|
|
|
|
ok = splitFunc(subtable, newSubTable, overflowRecord)
|
|
return ok
|
|
|
|
# End of OverFlow logic
|
|
|
|
|
|
def _buildClasses():
|
|
import new, re
|
|
from otData import otData
|
|
|
|
formatPat = re.compile("([A-Za-z0-9]+)Format(\d+)$")
|
|
namespace = globals()
|
|
|
|
# populate module with classes
|
|
for name, table in otData:
|
|
baseClass = BaseTable
|
|
m = formatPat.match(name)
|
|
if m:
|
|
# XxxFormatN subtable, we only add the "base" table
|
|
name = m.group(1)
|
|
baseClass = FormatSwitchingBaseTable
|
|
if not namespace.has_key(name):
|
|
# the class doesn't exist yet, so the base implementation is used.
|
|
cls = new.classobj(name, (baseClass,), {})
|
|
namespace[name] = cls
|
|
|
|
for base, alts in _equivalents.items():
|
|
base = namespace[base]
|
|
for alt in alts:
|
|
namespace[alt] = new.classobj(alt, (base,), {})
|
|
|
|
global lookupTypes
|
|
lookupTypes = {
|
|
'GSUB': {
|
|
1: SingleSubst,
|
|
2: MultipleSubst,
|
|
3: AlternateSubst,
|
|
4: LigatureSubst,
|
|
5: ContextSubst,
|
|
6: ChainContextSubst,
|
|
7: ExtensionSubst,
|
|
8: ReverseChainSingleSubst,
|
|
},
|
|
'GPOS': {
|
|
1: SinglePos,
|
|
2: PairPos,
|
|
3: CursivePos,
|
|
4: MarkBasePos,
|
|
5: MarkLigPos,
|
|
6: MarkMarkPos,
|
|
7: ContextPos,
|
|
8: ChainContextPos,
|
|
9: ExtensionPos,
|
|
},
|
|
}
|
|
lookupTypes['JSTF'] = lookupTypes['GPOS'] # JSTF contains GPOS
|
|
for lookupEnum in lookupTypes.values():
|
|
for enum, cls in lookupEnum.items():
|
|
cls.LookupType = enum
|
|
|
|
# add converters to classes
|
|
from otConverters import buildConverters
|
|
for name, table in otData:
|
|
m = formatPat.match(name)
|
|
if m:
|
|
# XxxFormatN subtable, add converter to "base" table
|
|
name, format = m.groups()
|
|
format = int(format)
|
|
cls = namespace[name]
|
|
if not hasattr(cls, "converters"):
|
|
cls.converters = {}
|
|
cls.convertersByName = {}
|
|
converters, convertersByName = buildConverters(table[1:], namespace)
|
|
cls.converters[format] = converters
|
|
cls.convertersByName[format] = convertersByName
|
|
else:
|
|
cls = namespace[name]
|
|
cls.converters, cls.convertersByName = buildConverters(table, namespace)
|
|
|
|
|
|
_buildClasses()
|
|
|
|
|
|
def _getGlyphsFromCoverageTable(coverage):
|
|
if coverage is None:
|
|
# empty coverage table
|
|
return []
|
|
else:
|
|
return coverage.glyphs
|