f0eb7e98ca
Before, equivalent types, eg. otTables.BacktrackCoverage, etc, where a subclass of their equivalent parent type, eg. otTables.Coverage With this change, they are the same type. The otBase and otConverters changes were needed to make the above happen and still generate correct XML for SubTable type.
862 lines
26 KiB
Python
862 lines
26 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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from __future__ import print_function, division, absolute_import
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from fontTools.misc.py23 import *
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from .otBase import BaseTable, FormatSwitchingBaseTable
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import operator
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import warnings
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class FeatureParams(BaseTable):
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def compile(self, writer, font):
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assert featureParamTypes.get(writer['FeatureTag']) == self.__class__, "Wrong FeatureParams type for feature '%s': %s" % (writer['FeatureTag'], self.__class__.__name__)
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BaseTable.compile(self, writer, font)
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def toXML(self, xmlWriter, font, attrs=None, name=None):
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BaseTable.toXML(self, xmlWriter, font, attrs, name=self.__class__.__name__)
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class FeatureParamsSize(FeatureParams):
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pass
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class FeatureParamsStylisticSet(FeatureParams):
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pass
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class FeatureParamsCharacterVariants(FeatureParams):
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pass
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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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# TODO only allow glyphs that are valid?
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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, key=lambda a: a.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=True)
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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=True) + 1
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except KeyError:
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# Apparently some tools use 65535 to "match all" the range
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if end != 'glyph65535':
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warnings.warn("Coverage table has end glyph ID out of range: %s." % end)
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# NOTE: We clobber out-of-range things here. There are legit uses for those,
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# but none that we have seen in the wild.
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endID = len(glyphOrder)
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glyphs.extend(glyphOrder[glyphID] for glyphID in range(startID, endID))
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else:
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assert 0, "unknown format: %s" % self.Format
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del self.Format # Don't need this anymore
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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(key=lambda a: a.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 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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outGIDS = [ (glyphID + delta) % 65536 for glyphID in inputGIDS ]
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outNames = [ font.getGlyphName(glyphID) for glyphID in outGIDS ]
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list(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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list(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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del self.Format # Don't need this anymore
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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 = list(mapping.items())
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getGlyphID = font.getGlyphID
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gidItems = [(getGlyphID(a), getGlyphID(b)) for a,b in items]
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sortableItems = sorted(zip(gidItems, items))
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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) % 65536
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if (inID + delta) % 65536 != outID:
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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 = sorted(self.mapping.items())
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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 MultipleSubst(FormatSwitchingBaseTable):
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def postRead(self, rawTable, font):
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mapping = {}
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if self.Format == 1:
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glyphs = _getGlyphsFromCoverageTable(rawTable["Coverage"])
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subst = [s.Substitute for s in rawTable["Sequence"]]
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mapping = dict(zip(glyphs, 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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del self.Format # Don't need this anymore
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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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cov = Coverage()
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cov.glyphs = sorted(list(mapping.keys()), key=font.getGlyphID)
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self.Format = 1
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rawTable = {
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"Coverage": cov,
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"Sequence": [self.makeSequence_(mapping[glyph])
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for glyph in cov.glyphs],
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}
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return rawTable
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def toXML2(self, xmlWriter, font):
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items = sorted(self.mapping.items())
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for inGlyph, outGlyphs in items:
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out = ",".join(outGlyphs)
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xmlWriter.simpletag("Substitution",
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[("in", inGlyph), ("out", out)])
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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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# TTX v3.0 and earlier.
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if name == "Coverage":
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self.old_coverage_ = []
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for element in content:
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if not isinstance(element, tuple):
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continue
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element_name, element_attrs, _ = element
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if element_name == "Glyph":
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self.old_coverage_.append(element_attrs["value"])
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return
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if name == "Sequence":
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index = int(attrs.get("index", len(mapping)))
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glyph = self.old_coverage_[index]
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glyph_mapping = mapping[glyph] = []
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for element in content:
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if not isinstance(element, tuple):
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continue
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element_name, element_attrs, _ = element
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if element_name == "Substitute":
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glyph_mapping.append(element_attrs["value"])
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return
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# TTX v3.1 and later.
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outGlyphs = attrs["out"].split(",")
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mapping[attrs["in"]] = [g.strip() for g in outGlyphs]
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@staticmethod
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def makeSequence_(g):
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seq = Sequence()
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seq.Substitute = g
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return seq
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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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glyphOrder = font.getGlyphOrder()
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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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try:
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startID = font.getGlyphID(start, requireReal=True)
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except KeyError:
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warnings.warn("ClassDef table has start glyph ID out of range: %s." % start)
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startID = len(glyphOrder)
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endID = startID + len(classList)
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if endID > len(glyphOrder):
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warnings.warn("ClassDef table has entries for out of range glyph IDs: %s,%s." % (start, len(classList)))
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# NOTE: We clobber out-of-range things here. There are legit uses for those,
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# but none that we have seen in the wild.
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endID = len(glyphOrder)
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for glyphID, cls in zip(range(startID, endID), classList):
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classDefs[glyphOrder[glyphID]] = cls
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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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try:
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startID = font.getGlyphID(start, requireReal=True)
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except KeyError:
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warnings.warn("ClassDef 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=True) + 1
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except KeyError:
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# Apparently some tools use 65535 to "match all" the range
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if end != 'glyph65535':
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warnings.warn("ClassDef table has end glyph ID out of range: %s." % end)
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# NOTE: We clobber out-of-range things here. There are legit uses for those,
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# but none that we have seen in the wild.
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endID = len(glyphOrder)
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for glyphID in range(startID, endID):
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classDefs[glyphOrder[glyphID]] = 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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del self.Format # Don't need this anymore
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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 = list(classDefs.items())
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format = 2
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rawTable = {"ClassRangeRecord": []}
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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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ranges = [[lastCls, last, lastName]]
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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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ranges[-1].extend([last, lastName])
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ranges.append([cls, glyphID, glyphName])
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last = glyphID
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lastName = glyphName
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lastCls = cls
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ranges[-1].extend([last, lastName])
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startGlyph = ranges[0][1]
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endGlyph = ranges[-1][3]
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glyphCount = endGlyph - startGlyph + 1
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if len(ranges) * 3 < glyphCount + 1:
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# Format 2 is more compact
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for i in range(len(ranges)):
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cls, start, startName, end, endName = ranges[i]
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rec = ClassRangeRecord()
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rec.Start = startName
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rec.End = endName
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rec.Class = cls
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ranges[i] = rec
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format = 2
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rawTable = {"ClassRangeRecord": ranges}
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else:
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# Format 1 is more compact
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startGlyphName = ranges[0][2]
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classes = [0] * glyphCount
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for cls, start, startName, end, endName in ranges:
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for g in range(start - startGlyph, end - startGlyph + 1):
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classes[g] = cls
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format = 1
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rawTable = {"StartGlyph": startGlyphName, "ClassValueArray": classes}
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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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items = sorted(self.classDefs.items())
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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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assert len(input) == len(alts)
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for inp,alt in zip(input,alts):
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alternates[inp] = alt.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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del self.Format # Don't need this anymore
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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 = list(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 = sorted(self.alternates.items())
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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 sorted(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 not isinstance(element, tuple):
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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 = _getGlyphsFromCoverageTable(rawTable["Coverage"])
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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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del self.Format # Don't need this anymore
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def preWrite(self, font):
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self.Format = 1
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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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if ligatures and isinstance(next(iter(ligatures)), tuple):
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# New high-level API in v3.1 and later. Note that we just support compiling this
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# for now. We don't load to this API, and don't do XML with it.
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# ligatures is map from components-sequence to lig-glyph
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newLigatures = dict()
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for comps,lig in sorted(ligatures.items(), key=lambda item: (-len(item[0]), item[0])):
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ligature = Ligature()
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ligature.Component = comps[1:]
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ligature.CompCount = len(comps)
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|
ligature.LigGlyph = lig
|
|
newLigatures.setdefault(comps[0], []).append(ligature)
|
|
ligatures = newLigatures
|
|
|
|
items = list(ligatures.items())
|
|
for i in range(len(items)):
|
|
glyphName, set = items[i]
|
|
items[i] = font.getGlyphID(glyphName), glyphName, set
|
|
items.sort()
|
|
cov = Coverage()
|
|
cov.glyphs = [ item[1] for item in items]
|
|
|
|
ligSets = []
|
|
setList = [ item[-1] for item in items ]
|
|
for set in setList:
|
|
ligSet = LigatureSet()
|
|
ligs = ligSet.Ligature = []
|
|
for lig in set:
|
|
ligs.append(lig)
|
|
ligSets.append(ligSet)
|
|
# Useful in that when splitting a sub-table because of an offset overflow
|
|
# I don't need to calculate the change in subtabl offset due to the coverage table size.
|
|
# Allows packing more rules in subtable.
|
|
self.sortCoverageLast = 1
|
|
return {"Coverage": cov, "LigatureSet": ligSets}
|
|
|
|
def toXML2(self, xmlWriter, font):
|
|
items = sorted(self.ligatures.items())
|
|
for glyphName, ligSets in items:
|
|
xmlWriter.begintag("LigatureSet", glyph=glyphName)
|
|
xmlWriter.newline()
|
|
for lig in ligSets:
|
|
xmlWriter.simpletag("Ligature", glyph=lig.LigGlyph,
|
|
components=",".join(lig.Component))
|
|
xmlWriter.newline()
|
|
xmlWriter.endtag("LigatureSet")
|
|
xmlWriter.newline()
|
|
|
|
def fromXML(self, name, attrs, content, font):
|
|
ligatures = getattr(self, "ligatures", None)
|
|
if ligatures is None:
|
|
ligatures = {}
|
|
self.ligatures = ligatures
|
|
glyphName = attrs["glyph"]
|
|
ligs = []
|
|
ligatures[glyphName] = ligs
|
|
for element in content:
|
|
if not isinstance(element, tuple):
|
|
continue
|
|
name, attrs, content = element
|
|
lig = Ligature()
|
|
lig.LigGlyph = attrs["glyph"]
|
|
components = attrs["components"]
|
|
lig.Component = components.split(",") if components else []
|
|
ligs.append(lig)
|
|
|
|
|
|
#
|
|
# For each subtable format there is a class. However, we don't really distinguish
|
|
# between "field name" and "format name": often these are the same. Yet there's
|
|
# a whole bunch of fields with different names. The following dict is a mapping
|
|
# from "format name" to "field name". _buildClasses() uses this to create a
|
|
# subclass for each alternate field name.
|
|
#
|
|
_equivalents = {
|
|
'MarkArray': ("Mark1Array",),
|
|
'LangSys': ('DefaultLangSys',),
|
|
'Coverage': ('MarkCoverage', 'BaseCoverage', 'LigatureCoverage', 'Mark1Coverage',
|
|
'Mark2Coverage', 'BacktrackCoverage', 'InputCoverage',
|
|
'LookAheadCoverage', 'VertGlyphCoverage', 'HorizGlyphCoverage',
|
|
'TopAccentCoverage', 'ExtendedShapeCoverage', 'MathKernCoverage'),
|
|
'ClassDef': ('ClassDef1', 'ClassDef2', 'BacktrackClassDef', 'InputClassDef',
|
|
'LookAheadClassDef', 'GlyphClassDef', 'MarkAttachClassDef'),
|
|
'Anchor': ('EntryAnchor', 'ExitAnchor', 'BaseAnchor', 'LigatureAnchor',
|
|
'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',),
|
|
'MathKern': ('TopRightMathKern', 'TopLeftMathKern', 'BottomRightMathKern',
|
|
'BottomLeftMathKern'),
|
|
'MathGlyphConstruction': ('VertGlyphConstruction', 'HorizGlyphConstruction'),
|
|
}
|
|
|
|
#
|
|
# 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 is 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 is 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.SubTable[0].__class__.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.ExtSubTable = subTable
|
|
lookup.SubTable[si] = extSubTable
|
|
ok = 1
|
|
return ok
|
|
|
|
def splitAlternateSubst(oldSubTable, newSubTable, overflowRecord):
|
|
ok = 1
|
|
newSubTable.Format = oldSubTable.Format
|
|
if hasattr(oldSubTable, 'sortCoverageLast'):
|
|
newSubTable.sortCoverageLast = oldSubTable.sortCoverageLast
|
|
|
|
oldAlts = sorted(oldSubTable.alternates.items())
|
|
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 = 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 = sorted(oldSubTable.ligatures.items())
|
|
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 = 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.ExtSubTable.__class__.LookupType
|
|
extSubTable = subtable
|
|
subtable = extSubTable.ExtSubTable
|
|
newExtSubTableClass = lookupTypes[overflowRecord.tableType][subtable.__class__.LookupType]
|
|
newExtSubTable = newExtSubTableClass()
|
|
newExtSubTable.Format = extSubTable.Format
|
|
lookup.SubTable.insert(subIndex + 1, newExtSubTable)
|
|
|
|
newSubTableClass = lookupTypes[overflowRecord.tableType][subTableType]
|
|
newSubTable = newSubTableClass()
|
|
newExtSubTable.ExtSubTable = newSubTable
|
|
else:
|
|
subTableType = subtable.__class__.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 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 name not in namespace:
|
|
# the class doesn't exist yet, so the base implementation is used.
|
|
cls = type(name, (baseClass,), {})
|
|
namespace[name] = cls
|
|
|
|
for base, alts in _equivalents.items():
|
|
base = namespace[base]
|
|
for alt in alts:
|
|
namespace[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
|
|
|
|
global featureParamTypes
|
|
featureParamTypes = {
|
|
'size': FeatureParamsSize,
|
|
}
|
|
for i in range(1, 20+1):
|
|
featureParamTypes['ss%02d' % i] = FeatureParamsStylisticSet
|
|
for i in range(1, 99+1):
|
|
featureParamTypes['cv%02d' % i] = FeatureParamsCharacterVariants
|
|
|
|
# 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
|
|
# XXX Add staticSize?
|
|
else:
|
|
cls = namespace[name]
|
|
cls.converters, cls.convertersByName = buildConverters(table, namespace)
|
|
# XXX Add staticSize?
|
|
|
|
|
|
_buildClasses()
|
|
|
|
|
|
def _getGlyphsFromCoverageTable(coverage):
|
|
if coverage is None:
|
|
# empty coverage table
|
|
return []
|
|
else:
|
|
return coverage.glyphs
|