1465 lines
45 KiB
Python
1465 lines
45 KiB
Python
# coding: utf-8
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"""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, unicode_literals
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from fontTools.misc.py23 import *
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from fontTools.misc.textTools import safeEval
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from .otBase import BaseTable, FormatSwitchingBaseTable, ValueRecord
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import operator
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import logging
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import struct
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log = logging.getLogger(__name__)
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class AATStateTable(object):
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def __init__(self):
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self.GlyphClasses = {} # GlyphID --> GlyphClass
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self.States = [] # List of AATState, indexed by state number
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self.PerGlyphLookups = [] # [{GlyphID:GlyphID}, ...]
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class AATState(object):
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def __init__(self):
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self.Transitions = {} # GlyphClass --> AATAction
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class AATAction(object):
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_FLAGS = None
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def _writeFlagsToXML(self, xmlWriter):
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flags = [f for f in self._FLAGS if self.__dict__[f]]
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if flags:
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xmlWriter.simpletag("Flags", value=",".join(flags))
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xmlWriter.newline()
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if self.ReservedFlags != 0:
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xmlWriter.simpletag(
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"ReservedFlags",
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value='0x%04X' % self.ReservedFlags)
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xmlWriter.newline()
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def _setFlag(self, flag):
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assert flag in self._FLAGS, "unsupported flag %s" % flag
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self.__dict__[flag] = True
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class RearrangementMorphAction(AATAction):
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staticSize = 4
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_FLAGS = ["MarkFirst", "DontAdvance", "MarkLast"]
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_VERBS = {
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0: "no change",
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1: "Ax ⇒ xA",
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2: "xD ⇒ Dx",
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3: "AxD ⇒ DxA",
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4: "ABx ⇒ xAB",
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5: "ABx ⇒ xBA",
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6: "xCD ⇒ CDx",
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7: "xCD ⇒ DCx",
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8: "AxCD ⇒ CDxA",
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9: "AxCD ⇒ DCxA",
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10: "ABxD ⇒ DxAB",
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11: "ABxD ⇒ DxBA",
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12: "ABxCD ⇒ CDxAB",
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13: "ABxCD ⇒ CDxBA",
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14: "ABxCD ⇒ DCxAB",
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15: "ABxCD ⇒ DCxBA",
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}
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def __init__(self):
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self.NewState = 0
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self.Verb = 0
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self.MarkFirst = False
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self.DontAdvance = False
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self.MarkLast = False
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self.ReservedFlags = 0
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def compile(self, writer, font, actionIndex):
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assert actionIndex is None
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writer.writeUShort(self.NewState)
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assert self.Verb >= 0 and self.Verb <= 15, self.Verb
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flags = self.Verb | self.ReservedFlags
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if self.MarkFirst: flags |= 0x8000
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if self.DontAdvance: flags |= 0x4000
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if self.MarkLast: flags |= 0x2000
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writer.writeUShort(flags)
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def decompile(self, reader, font, actionReader):
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assert actionReader is None
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self.NewState = reader.readUShort()
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flags = reader.readUShort()
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self.Verb = flags & 0xF
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self.MarkFirst = bool(flags & 0x8000)
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self.DontAdvance = bool(flags & 0x4000)
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self.MarkLast = bool(flags & 0x2000)
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self.ReservedFlags = flags & 0x1FF0
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def toXML(self, xmlWriter, font, attrs, name):
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xmlWriter.begintag(name, **attrs)
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xmlWriter.newline()
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xmlWriter.simpletag("NewState", value=self.NewState)
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xmlWriter.newline()
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self._writeFlagsToXML(xmlWriter)
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xmlWriter.simpletag("Verb", value=self.Verb)
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verbComment = self._VERBS.get(self.Verb)
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if verbComment is not None:
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xmlWriter.comment(verbComment)
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xmlWriter.newline()
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xmlWriter.endtag(name)
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xmlWriter.newline()
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def fromXML(self, name, attrs, content, font):
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self.NewState = self.Verb = self.ReservedFlags = 0
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self.MarkFirst = self.DontAdvance = self.MarkLast = False
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content = [t for t in content if isinstance(t, tuple)]
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for eltName, eltAttrs, eltContent in content:
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if eltName == "NewState":
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self.NewState = safeEval(eltAttrs["value"])
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elif eltName == "Verb":
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self.Verb = safeEval(eltAttrs["value"])
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elif eltName == "ReservedFlags":
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self.ReservedFlags = safeEval(eltAttrs["value"])
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elif eltName == "Flags":
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for flag in eltAttrs["value"].split(","):
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self._setFlag(flag.strip())
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class ContextualMorphAction(AATAction):
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staticSize = 8
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_FLAGS = ["SetMark", "DontAdvance"]
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def __init__(self):
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self.NewState = 0
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self.SetMark, self.DontAdvance = False, False
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self.ReservedFlags = 0
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self.MarkIndex, self.CurrentIndex = 0xFFFF, 0xFFFF
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def compile(self, writer, font, actionIndex):
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assert actionIndex is None
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writer.writeUShort(self.NewState)
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flags = self.ReservedFlags
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if self.SetMark: flags |= 0x8000
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if self.DontAdvance: flags |= 0x4000
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writer.writeUShort(flags)
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writer.writeUShort(self.MarkIndex)
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writer.writeUShort(self.CurrentIndex)
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def decompile(self, reader, font, actionReader):
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assert actionReader is None
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self.NewState = reader.readUShort()
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flags = reader.readUShort()
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self.SetMark = bool(flags & 0x8000)
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self.DontAdvance = bool(flags & 0x4000)
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self.ReservedFlags = flags & 0x3FFF
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self.MarkIndex = reader.readUShort()
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self.CurrentIndex = reader.readUShort()
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def toXML(self, xmlWriter, font, attrs, name):
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xmlWriter.begintag(name, **attrs)
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xmlWriter.newline()
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xmlWriter.simpletag("NewState", value=self.NewState)
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xmlWriter.newline()
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self._writeFlagsToXML(xmlWriter)
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xmlWriter.simpletag("MarkIndex", value=self.MarkIndex)
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xmlWriter.newline()
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xmlWriter.simpletag("CurrentIndex",
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value=self.CurrentIndex)
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xmlWriter.newline()
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xmlWriter.endtag(name)
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xmlWriter.newline()
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def fromXML(self, name, attrs, content, font):
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self.NewState = self.ReservedFlags = 0
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self.SetMark = self.DontAdvance = False
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self.MarkIndex, self.CurrentIndex = 0xFFFF, 0xFFFF
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content = [t for t in content if isinstance(t, tuple)]
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for eltName, eltAttrs, eltContent in content:
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if eltName == "NewState":
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self.NewState = safeEval(eltAttrs["value"])
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elif eltName == "Flags":
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for flag in eltAttrs["value"].split(","):
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self._setFlag(flag.strip())
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elif eltName == "ReservedFlags":
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self.ReservedFlags = safeEval(eltAttrs["value"])
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elif eltName == "MarkIndex":
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self.MarkIndex = safeEval(eltAttrs["value"])
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elif eltName == "CurrentIndex":
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self.CurrentIndex = safeEval(eltAttrs["value"])
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class LigAction(object):
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def __init__(self):
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self.Store = False
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# GlyphIndexDelta is a (possibly negative) delta that gets
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# added to the glyph ID at the top of the AAT runtime
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# execution stack. It is *not* a byte offset into the
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# morx table. The result of the addition, which is performed
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# at run time by the shaping engine, is an index into
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# the ligature components table. See 'morx' specification.
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# In the AAT specification, this field is called Offset;
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# but its meaning is quite different from other offsets
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# in either AAT or OpenType, so we use a different name.
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self.GlyphIndexDelta = 0
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class LigatureMorphAction(AATAction):
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staticSize = 6
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_FLAGS = ["SetComponent", "DontAdvance"]
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def __init__(self):
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self.NewState = 0
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self.SetComponent, self.DontAdvance = False, False
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self.ReservedFlags = 0
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self.Actions = []
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def compile(self, writer, font, actionIndex):
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assert actionIndex is not None
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writer.writeUShort(self.NewState)
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flags = self.ReservedFlags
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if self.SetComponent: flags |= 0x8000
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if self.DontAdvance: flags |= 0x4000
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if len(self.Actions) > 0: flags |= 0x2000
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writer.writeUShort(flags)
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if len(self.Actions) > 0:
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actions = self.compileLigActions()
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writer.writeUShort(actionIndex[actions])
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else:
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writer.writeUShort(0)
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def decompile(self, reader, font, actionReader):
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assert actionReader is not None
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self.NewState = reader.readUShort()
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flags = reader.readUShort()
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self.SetComponent = bool(flags & 0x8000)
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self.DontAdvance = bool(flags & 0x4000)
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performAction = bool(flags & 0x2000)
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# As of 2017-09-12, the 'morx' specification says that
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# the reserved bitmask in ligature subtables is 0x3FFF.
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# However, the specification also defines a flag 0x2000,
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# so the reserved value should actually be 0x1FFF.
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# TODO: Report this specification bug to Apple.
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self.ReservedFlags = flags & 0x1FFF
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actionIndex = reader.readUShort()
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if performAction:
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self.Actions = self._decompileLigActions(
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actionReader, actionIndex)
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else:
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self.Actions = []
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def compileLigActions(self):
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result = []
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for i, action in enumerate(self.Actions):
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last = (i == len(self.Actions) - 1)
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value = action.GlyphIndexDelta & 0x3FFFFFFF
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value |= 0x80000000 if last else 0
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value |= 0x40000000 if action.Store else 0
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result.append(struct.pack(">L", value))
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return bytesjoin(result)
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def _decompileLigActions(self, actionReader, actionIndex):
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actions = []
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last = False
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reader = actionReader.getSubReader(
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actionReader.pos + actionIndex * 4)
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while not last:
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value = reader.readULong()
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last = bool(value & 0x80000000)
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action = LigAction()
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actions.append(action)
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action.Store = bool(value & 0x40000000)
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delta = value & 0x3FFFFFFF
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if delta >= 0x20000000: # sign-extend 30-bit value
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delta = -0x40000000 + delta
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action.GlyphIndexDelta = delta
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return actions
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def fromXML(self, name, attrs, content, font):
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self.NewState = self.ReservedFlags = 0
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self.SetComponent = self.DontAdvance = False
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self.ReservedFlags = 0
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self.Actions = []
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content = [t for t in content if isinstance(t, tuple)]
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for eltName, eltAttrs, eltContent in content:
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if eltName == "NewState":
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self.NewState = safeEval(eltAttrs["value"])
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elif eltName == "Flags":
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for flag in eltAttrs["value"].split(","):
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self._setFlag(flag.strip())
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elif eltName == "ReservedFlags":
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self.ReservedFlags = safeEval(eltAttrs["value"])
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elif eltName == "Action":
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action = LigAction()
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flags = eltAttrs.get("Flags", "").split(",")
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flags = [f.strip() for f in flags]
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action.Store = "Store" in flags
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action.GlyphIndexDelta = safeEval(
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eltAttrs["GlyphIndexDelta"])
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self.Actions.append(action)
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def toXML(self, xmlWriter, font, attrs, name):
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xmlWriter.begintag(name, **attrs)
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xmlWriter.newline()
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xmlWriter.simpletag("NewState", value=self.NewState)
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xmlWriter.newline()
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self._writeFlagsToXML(xmlWriter)
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for action in self.Actions:
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attribs = [("GlyphIndexDelta", action.GlyphIndexDelta)]
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if action.Store:
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attribs.append(("Flags", "Store"))
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xmlWriter.simpletag("Action", attribs)
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xmlWriter.newline()
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xmlWriter.endtag(name)
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xmlWriter.newline()
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class InsertionMorphAction(AATAction):
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staticSize = 8
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_FLAGS = ["SetMark", "DontAdvance",
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"CurrentIsKashidaLike", "MarkedIsKashidaLike",
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"CurrentInsertBefore", "MarkedInsertBefore"]
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def __init__(self):
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self.NewState = 0
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for flag in self._FLAGS:
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setattr(self, flag, False)
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self.ReservedFlags = 0
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self.CurrentInsertionAction, self.MarkedInsertionAction = [], []
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def compile(self, writer, font, actionIndex):
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assert actionIndex is not None
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writer.writeUShort(self.NewState)
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flags = self.ReservedFlags
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if self.SetMark: flags |= 0x8000
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if self.DontAdvance: flags |= 0x4000
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if self.CurrentIsKashidaLike: flags |= 0x2000
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if self.MarkedIsKashidaLike: flags |= 0x1000
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if self.CurrentInsertBefore: flags |= 0x0800
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if self.MarkedInsertBefore: flags |= 0x0400
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flags |= len(self.CurrentInsertionAction) << 5
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flags |= len(self.MarkedInsertionAction)
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writer.writeUShort(flags)
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if len(self.CurrentInsertionAction) > 0:
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currentIndex = actionIndex[
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tuple(self.CurrentInsertionAction)]
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else:
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currentIndex = 0xFFFF
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writer.writeUShort(currentIndex)
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if len(self.MarkedInsertionAction) > 0:
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markedIndex = actionIndex[
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tuple(self.MarkedInsertionAction)]
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else:
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markedIndex = 0xFFFF
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writer.writeUShort(markedIndex)
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def decompile(self, reader, font, actionReader):
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assert actionReader is not None
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self.NewState = reader.readUShort()
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flags = reader.readUShort()
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self.SetMark = bool(flags & 0x8000)
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self.DontAdvance = bool(flags & 0x4000)
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self.CurrentIsKashidaLike = bool(flags & 0x2000)
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self.MarkedIsKashidaLike = bool(flags & 0x1000)
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self.CurrentInsertBefore = bool(flags & 0x0800)
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self.MarkedInsertBefore = bool(flags & 0x0400)
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self.CurrentInsertionAction = self._decompileInsertionAction(
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actionReader, font,
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index=reader.readUShort(),
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count=((flags & 0x03E0) >> 5))
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self.MarkedInsertionAction = self._decompileInsertionAction(
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actionReader, font,
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index=reader.readUShort(),
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count=(flags & 0x001F))
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def _decompileInsertionAction(self, actionReader, font, index, count):
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if index == 0xFFFF or count == 0:
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return []
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reader = actionReader.getSubReader(
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actionReader.pos + index * 2)
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return [font.getGlyphName(glyphID)
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for glyphID in reader.readUShortArray(count)]
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def toXML(self, xmlWriter, font, attrs, name):
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xmlWriter.begintag(name, **attrs)
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xmlWriter.newline()
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xmlWriter.simpletag("NewState", value=self.NewState)
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xmlWriter.newline()
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self._writeFlagsToXML(xmlWriter)
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for g in self.CurrentInsertionAction:
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xmlWriter.simpletag("CurrentInsertionAction", glyph=g)
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xmlWriter.newline()
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for g in self.MarkedInsertionAction:
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xmlWriter.simpletag("MarkedInsertionAction", glyph=g)
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xmlWriter.newline()
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xmlWriter.endtag(name)
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xmlWriter.newline()
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def fromXML(self, name, attrs, content, font):
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self.__init__()
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content = [t for t in content if isinstance(t, tuple)]
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for eltName, eltAttrs, eltContent in content:
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if eltName == "NewState":
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self.NewState = safeEval(eltAttrs["value"])
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elif eltName == "Flags":
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for flag in eltAttrs["value"].split(","):
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self._setFlag(flag.strip())
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elif eltName == "CurrentInsertionAction":
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self.CurrentInsertionAction.append(
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eltAttrs["glyph"])
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elif eltName == "MarkedInsertionAction":
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self.MarkedInsertionAction.append(
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eltAttrs["glyph"])
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else:
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assert False, eltName
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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 populateDefaults(self, propagator=None):
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if not hasattr(self, 'glyphs'):
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self.glyphs = []
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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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log.warning("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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log.warning("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:
|
|
# Apparently some tools use 65535 to "match all" the range
|
|
if end != 'glyph65535':
|
|
log.warning("Coverage table has end glyph ID out of range: %s.", end)
|
|
# NOTE: We clobber out-of-range things here. There are legit uses for those,
|
|
# but none that we have seen in the wild.
|
|
endID = len(glyphOrder)
|
|
glyphs.extend(glyphOrder[glyphID] for glyphID in range(startID, endID))
|
|
else:
|
|
self.glyphs = []
|
|
log.warning("Unknown Coverage format: %s", self.Format)
|
|
|
|
def preWrite(self, font):
|
|
glyphs = getattr(self, "glyphs", None)
|
|
if glyphs is None:
|
|
glyphs = self.glyphs = []
|
|
format = 1
|
|
rawTable = {"GlyphArray": glyphs}
|
|
getGlyphID = font.getGlyphID
|
|
if glyphs:
|
|
# find out whether Format 2 is more compact or not
|
|
glyphIDs = [getGlyphID(glyphName) for glyphName in glyphs ]
|
|
brokenOrder = sorted(glyphIDs) != glyphIDs
|
|
|
|
last = glyphIDs[0]
|
|
ranges = [[last]]
|
|
for glyphID in glyphIDs[1:]:
|
|
if glyphID != last + 1:
|
|
ranges[-1].append(last)
|
|
ranges.append([glyphID])
|
|
last = glyphID
|
|
ranges[-1].append(last)
|
|
|
|
if brokenOrder or len(ranges) * 3 < len(glyphs): # 3 words vs. 1 word
|
|
# Format 2 is more compact
|
|
index = 0
|
|
for i in range(len(ranges)):
|
|
start, end = ranges[i]
|
|
r = RangeRecord()
|
|
r.StartID = start
|
|
r.Start = font.getGlyphName(start)
|
|
r.End = font.getGlyphName(end)
|
|
r.StartCoverageIndex = index
|
|
ranges[i] = r
|
|
index = index + end - start + 1
|
|
if brokenOrder:
|
|
log.warning("GSUB/GPOS Coverage is not sorted by glyph ids.")
|
|
ranges.sort(key=lambda a: a.StartID)
|
|
for r in ranges:
|
|
del r.StartID
|
|
format = 2
|
|
rawTable = {"RangeRecord": ranges}
|
|
#else:
|
|
# fallthrough; Format 1 is more compact
|
|
self.Format = format
|
|
return rawTable
|
|
|
|
def toXML2(self, xmlWriter, font):
|
|
for glyphName in getattr(self, "glyphs", []):
|
|
xmlWriter.simpletag("Glyph", value=glyphName)
|
|
xmlWriter.newline()
|
|
|
|
def fromXML(self, name, attrs, content, font):
|
|
glyphs = getattr(self, "glyphs", None)
|
|
if glyphs is None:
|
|
glyphs = []
|
|
self.glyphs = glyphs
|
|
glyphs.append(attrs["value"])
|
|
|
|
|
|
class VarIdxMap(BaseTable):
|
|
|
|
def populateDefaults(self, propagator=None):
|
|
if not hasattr(self, 'mapping'):
|
|
self.mapping = {}
|
|
|
|
def postRead(self, rawTable, font):
|
|
assert (rawTable['EntryFormat'] & 0xFFC0) == 0
|
|
glyphOrder = font.getGlyphOrder()
|
|
mapList = rawTable['mapping']
|
|
mapList.extend([mapList[-1]] * (len(glyphOrder) - len(mapList)))
|
|
self.mapping = dict(zip(glyphOrder, mapList))
|
|
|
|
def preWrite(self, font):
|
|
mapping = getattr(self, "mapping", None)
|
|
if mapping is None:
|
|
mapping = self.mapping = {}
|
|
|
|
glyphOrder = font.getGlyphOrder()
|
|
mapping = [mapping[g] for g in glyphOrder]
|
|
while len(mapping) > 1 and mapping[-2] == mapping[-1]:
|
|
del mapping[-1]
|
|
|
|
rawTable = { 'mapping': mapping }
|
|
rawTable['MappingCount'] = len(mapping)
|
|
|
|
ored = 0
|
|
for idx in mapping:
|
|
ored |= idx
|
|
|
|
inner = ored & 0xFFFF
|
|
innerBits = 0
|
|
while inner:
|
|
innerBits += 1
|
|
inner >>= 1
|
|
innerBits = max(innerBits, 1)
|
|
assert innerBits <= 16
|
|
|
|
ored = (ored >> (16-innerBits)) | (ored & ((1<<innerBits)-1))
|
|
if ored <= 0x000000FF:
|
|
entrySize = 1
|
|
elif ored <= 0x0000FFFF:
|
|
entrySize = 2
|
|
elif ored <= 0x00FFFFFF:
|
|
entrySize = 3
|
|
else:
|
|
entrySize = 4
|
|
|
|
entryFormat = ((entrySize - 1) << 4) | (innerBits - 1)
|
|
|
|
rawTable['EntryFormat'] = entryFormat
|
|
return rawTable
|
|
|
|
def toXML2(self, xmlWriter, font):
|
|
for glyph, value in sorted(getattr(self, "mapping", {}).items()):
|
|
attrs = (
|
|
('glyph', glyph),
|
|
('outer', value >> 16),
|
|
('inner', value & 0xFFFF),
|
|
)
|
|
xmlWriter.simpletag("Map", attrs)
|
|
xmlWriter.newline()
|
|
|
|
def fromXML(self, name, attrs, content, font):
|
|
mapping = getattr(self, "mapping", None)
|
|
if mapping is None:
|
|
mapping = {}
|
|
self.mapping = mapping
|
|
try:
|
|
glyph = attrs['glyph']
|
|
except: # https://github.com/fonttools/fonttools/commit/21cbab8ce9ded3356fef3745122da64dcaf314e9#commitcomment-27649836
|
|
glyph = font.getGlyphOrder()[attrs['index']]
|
|
outer = safeEval(attrs['outer'])
|
|
inner = safeEval(attrs['inner'])
|
|
assert inner <= 0xFFFF
|
|
mapping[glyph] = (outer << 16) | inner
|
|
|
|
|
|
class SingleSubst(FormatSwitchingBaseTable):
|
|
|
|
def populateDefaults(self, propagator=None):
|
|
if not hasattr(self, 'mapping'):
|
|
self.mapping = {}
|
|
|
|
def postRead(self, rawTable, font):
|
|
mapping = {}
|
|
input = _getGlyphsFromCoverageTable(rawTable["Coverage"])
|
|
lenMapping = len(input)
|
|
if self.Format == 1:
|
|
delta = rawTable["DeltaGlyphID"]
|
|
inputGIDS = [ font.getGlyphID(name) for name in input ]
|
|
outGIDS = [ (glyphID + delta) % 65536 for glyphID in inputGIDS ]
|
|
outNames = [ font.getGlyphName(glyphID) for glyphID in outGIDS ]
|
|
list(map(operator.setitem, [mapping]*lenMapping, input, outNames))
|
|
elif self.Format == 2:
|
|
assert len(input) == rawTable["GlyphCount"], \
|
|
"invalid SingleSubstFormat2 table"
|
|
subst = rawTable["Substitute"]
|
|
list(map(operator.setitem, [mapping]*lenMapping, input, subst))
|
|
else:
|
|
assert 0, "unknown format: %s" % self.Format
|
|
self.mapping = mapping
|
|
|
|
def preWrite(self, font):
|
|
mapping = getattr(self, "mapping", None)
|
|
if mapping is None:
|
|
mapping = self.mapping = {}
|
|
items = list(mapping.items())
|
|
getGlyphID = font.getGlyphID
|
|
gidItems = [(getGlyphID(a), getGlyphID(b)) for a,b in items]
|
|
sortableItems = sorted(zip(gidItems, items))
|
|
|
|
# figure out format
|
|
format = 2
|
|
delta = None
|
|
for inID, outID in gidItems:
|
|
if delta is None:
|
|
delta = (outID - inID) % 65536
|
|
|
|
if (inID + delta) % 65536 != outID:
|
|
break
|
|
else:
|
|
if delta is None:
|
|
# the mapping is empty, better use format 2
|
|
format = 2
|
|
else:
|
|
format = 1
|
|
|
|
rawTable = {}
|
|
self.Format = format
|
|
cov = Coverage()
|
|
input = [ item [1][0] for item in sortableItems]
|
|
subst = [ item [1][1] for item in sortableItems]
|
|
cov.glyphs = input
|
|
rawTable["Coverage"] = cov
|
|
if format == 1:
|
|
assert delta is not None
|
|
rawTable["DeltaGlyphID"] = delta
|
|
else:
|
|
rawTable["Substitute"] = subst
|
|
return rawTable
|
|
|
|
def toXML2(self, xmlWriter, font):
|
|
items = sorted(self.mapping.items())
|
|
for inGlyph, outGlyph in items:
|
|
xmlWriter.simpletag("Substitution",
|
|
[("in", inGlyph), ("out", outGlyph)])
|
|
xmlWriter.newline()
|
|
|
|
def fromXML(self, name, attrs, content, font):
|
|
mapping = getattr(self, "mapping", None)
|
|
if mapping is None:
|
|
mapping = {}
|
|
self.mapping = mapping
|
|
mapping[attrs["in"]] = attrs["out"]
|
|
|
|
|
|
class MultipleSubst(FormatSwitchingBaseTable):
|
|
|
|
def populateDefaults(self, propagator=None):
|
|
if not hasattr(self, 'mapping'):
|
|
self.mapping = {}
|
|
|
|
def postRead(self, rawTable, font):
|
|
mapping = {}
|
|
if self.Format == 1:
|
|
glyphs = _getGlyphsFromCoverageTable(rawTable["Coverage"])
|
|
subst = [s.Substitute for s in rawTable["Sequence"]]
|
|
mapping = dict(zip(glyphs, subst))
|
|
else:
|
|
assert 0, "unknown format: %s" % self.Format
|
|
self.mapping = mapping
|
|
|
|
def preWrite(self, font):
|
|
mapping = getattr(self, "mapping", None)
|
|
if mapping is None:
|
|
mapping = self.mapping = {}
|
|
cov = Coverage()
|
|
cov.glyphs = sorted(list(mapping.keys()), key=font.getGlyphID)
|
|
self.Format = 1
|
|
rawTable = {
|
|
"Coverage": cov,
|
|
"Sequence": [self.makeSequence_(mapping[glyph])
|
|
for glyph in cov.glyphs],
|
|
}
|
|
return rawTable
|
|
|
|
def toXML2(self, xmlWriter, font):
|
|
items = sorted(self.mapping.items())
|
|
for inGlyph, outGlyphs in items:
|
|
out = ",".join(outGlyphs)
|
|
xmlWriter.simpletag("Substitution",
|
|
[("in", inGlyph), ("out", out)])
|
|
xmlWriter.newline()
|
|
|
|
def fromXML(self, name, attrs, content, font):
|
|
mapping = getattr(self, "mapping", None)
|
|
if mapping is None:
|
|
mapping = {}
|
|
self.mapping = mapping
|
|
|
|
# TTX v3.0 and earlier.
|
|
if name == "Coverage":
|
|
self.old_coverage_ = []
|
|
for element in content:
|
|
if not isinstance(element, tuple):
|
|
continue
|
|
element_name, element_attrs, _ = element
|
|
if element_name == "Glyph":
|
|
self.old_coverage_.append(element_attrs["value"])
|
|
return
|
|
if name == "Sequence":
|
|
index = int(attrs.get("index", len(mapping)))
|
|
glyph = self.old_coverage_[index]
|
|
glyph_mapping = mapping[glyph] = []
|
|
for element in content:
|
|
if not isinstance(element, tuple):
|
|
continue
|
|
element_name, element_attrs, _ = element
|
|
if element_name == "Substitute":
|
|
glyph_mapping.append(element_attrs["value"])
|
|
return
|
|
|
|
# TTX v3.1 and later.
|
|
outGlyphs = attrs["out"].split(",") if attrs["out"] else []
|
|
mapping[attrs["in"]] = [g.strip() for g in outGlyphs]
|
|
|
|
@staticmethod
|
|
def makeSequence_(g):
|
|
seq = Sequence()
|
|
seq.Substitute = g
|
|
return seq
|
|
|
|
|
|
class ClassDef(FormatSwitchingBaseTable):
|
|
|
|
def populateDefaults(self, propagator=None):
|
|
if not hasattr(self, 'classDefs'):
|
|
self.classDefs = {}
|
|
|
|
def postRead(self, rawTable, font):
|
|
classDefs = {}
|
|
glyphOrder = font.getGlyphOrder()
|
|
|
|
if self.Format == 1:
|
|
start = rawTable["StartGlyph"]
|
|
classList = rawTable["ClassValueArray"]
|
|
try:
|
|
startID = font.getGlyphID(start, requireReal=True)
|
|
except KeyError:
|
|
log.warning("ClassDef table has start glyph ID out of range: %s.", start)
|
|
startID = len(glyphOrder)
|
|
endID = startID + len(classList)
|
|
if endID > len(glyphOrder):
|
|
log.warning("ClassDef table has entries for out of range glyph IDs: %s,%s.",
|
|
start, len(classList))
|
|
# NOTE: We clobber out-of-range things here. There are legit uses for those,
|
|
# but none that we have seen in the wild.
|
|
endID = len(glyphOrder)
|
|
|
|
for glyphID, cls in zip(range(startID, endID), classList):
|
|
if cls:
|
|
classDefs[glyphOrder[glyphID]] = cls
|
|
|
|
elif self.Format == 2:
|
|
records = rawTable["ClassRangeRecord"]
|
|
for rec in records:
|
|
start = rec.Start
|
|
end = rec.End
|
|
cls = rec.Class
|
|
try:
|
|
startID = font.getGlyphID(start, requireReal=True)
|
|
except KeyError:
|
|
log.warning("ClassDef table has start glyph ID out of range: %s.", start)
|
|
continue
|
|
try:
|
|
endID = font.getGlyphID(end, requireReal=True) + 1
|
|
except KeyError:
|
|
# Apparently some tools use 65535 to "match all" the range
|
|
if end != 'glyph65535':
|
|
log.warning("ClassDef table has end glyph ID out of range: %s.", end)
|
|
# NOTE: We clobber out-of-range things here. There are legit uses for those,
|
|
# but none that we have seen in the wild.
|
|
endID = len(glyphOrder)
|
|
for glyphID in range(startID, endID):
|
|
if cls:
|
|
classDefs[glyphOrder[glyphID]] = cls
|
|
else:
|
|
log.warning("Unknown ClassDef format: %s", self.Format)
|
|
self.classDefs = classDefs
|
|
|
|
def _getClassRanges(self, font):
|
|
classDefs = getattr(self, "classDefs", None)
|
|
if classDefs is None:
|
|
self.classDefs = {}
|
|
return
|
|
getGlyphID = font.getGlyphID
|
|
items = []
|
|
for glyphName, cls in classDefs.items():
|
|
if not cls:
|
|
continue
|
|
items.append((getGlyphID(glyphName), glyphName, cls))
|
|
if items:
|
|
items.sort()
|
|
last, lastName, lastCls = items[0]
|
|
ranges = [[lastCls, last, lastName]]
|
|
for glyphID, glyphName, cls in items[1:]:
|
|
if glyphID != last + 1 or cls != lastCls:
|
|
ranges[-1].extend([last, lastName])
|
|
ranges.append([cls, glyphID, glyphName])
|
|
last = glyphID
|
|
lastName = glyphName
|
|
lastCls = cls
|
|
ranges[-1].extend([last, lastName])
|
|
return ranges
|
|
|
|
def preWrite(self, font):
|
|
format = 2
|
|
rawTable = {"ClassRangeRecord": []}
|
|
ranges = self._getClassRanges(font)
|
|
if ranges:
|
|
startGlyph = ranges[0][1]
|
|
endGlyph = ranges[-1][3]
|
|
glyphCount = endGlyph - startGlyph + 1
|
|
if len(ranges) * 3 < glyphCount + 1:
|
|
# Format 2 is more compact
|
|
for i in range(len(ranges)):
|
|
cls, start, startName, end, endName = ranges[i]
|
|
rec = ClassRangeRecord()
|
|
rec.Start = startName
|
|
rec.End = endName
|
|
rec.Class = cls
|
|
ranges[i] = rec
|
|
format = 2
|
|
rawTable = {"ClassRangeRecord": ranges}
|
|
else:
|
|
# Format 1 is more compact
|
|
startGlyphName = ranges[0][2]
|
|
classes = [0] * glyphCount
|
|
for cls, start, startName, end, endName in ranges:
|
|
for g in range(start - startGlyph, end - startGlyph + 1):
|
|
classes[g] = cls
|
|
format = 1
|
|
rawTable = {"StartGlyph": startGlyphName, "ClassValueArray": classes}
|
|
self.Format = format
|
|
return rawTable
|
|
|
|
def toXML2(self, xmlWriter, font):
|
|
items = sorted(self.classDefs.items())
|
|
for glyphName, cls in items:
|
|
xmlWriter.simpletag("ClassDef", [("glyph", glyphName), ("class", cls)])
|
|
xmlWriter.newline()
|
|
|
|
def fromXML(self, name, attrs, content, font):
|
|
classDefs = getattr(self, "classDefs", None)
|
|
if classDefs is None:
|
|
classDefs = {}
|
|
self.classDefs = classDefs
|
|
classDefs[attrs["glyph"]] = int(attrs["class"])
|
|
|
|
|
|
class AlternateSubst(FormatSwitchingBaseTable):
|
|
|
|
def populateDefaults(self, propagator=None):
|
|
if not hasattr(self, 'alternates'):
|
|
self.alternates = {}
|
|
|
|
def postRead(self, rawTable, font):
|
|
alternates = {}
|
|
if self.Format == 1:
|
|
input = _getGlyphsFromCoverageTable(rawTable["Coverage"])
|
|
alts = rawTable["AlternateSet"]
|
|
assert len(input) == len(alts)
|
|
for inp,alt in zip(input,alts):
|
|
alternates[inp] = alt.Alternate
|
|
else:
|
|
assert 0, "unknown format: %s" % self.Format
|
|
self.alternates = alternates
|
|
|
|
def preWrite(self, font):
|
|
self.Format = 1
|
|
alternates = getattr(self, "alternates", None)
|
|
if alternates is None:
|
|
alternates = self.alternates = {}
|
|
items = list(alternates.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]
|
|
alternates = []
|
|
setList = [ item[-1] for item in items]
|
|
for set in setList:
|
|
alts = AlternateSet()
|
|
alts.Alternate = set
|
|
alternates.append(alts)
|
|
# a special case to deal with the fact that several hundred Adobe Japan1-5
|
|
# CJK fonts will overflow an offset if the coverage table isn't pushed to the end.
|
|
# Also useful in that when splitting a sub-table because of an offset overflow
|
|
# I don't need to calculate the change in the subtable offset due to the change in the coverage table size.
|
|
# Allows packing more rules in subtable.
|
|
self.sortCoverageLast = 1
|
|
return {"Coverage": cov, "AlternateSet": alternates}
|
|
|
|
def toXML2(self, xmlWriter, font):
|
|
items = sorted(self.alternates.items())
|
|
for glyphName, alternates in items:
|
|
xmlWriter.begintag("AlternateSet", glyph=glyphName)
|
|
xmlWriter.newline()
|
|
for alt in alternates:
|
|
xmlWriter.simpletag("Alternate", glyph=alt)
|
|
xmlWriter.newline()
|
|
xmlWriter.endtag("AlternateSet")
|
|
xmlWriter.newline()
|
|
|
|
def fromXML(self, name, attrs, content, font):
|
|
alternates = getattr(self, "alternates", None)
|
|
if alternates is None:
|
|
alternates = {}
|
|
self.alternates = alternates
|
|
glyphName = attrs["glyph"]
|
|
set = []
|
|
alternates[glyphName] = set
|
|
for element in content:
|
|
if not isinstance(element, tuple):
|
|
continue
|
|
name, attrs, content = element
|
|
set.append(attrs["glyph"])
|
|
|
|
|
|
class LigatureSubst(FormatSwitchingBaseTable):
|
|
|
|
def populateDefaults(self, propagator=None):
|
|
if not hasattr(self, 'ligatures'):
|
|
self.ligatures = {}
|
|
|
|
def postRead(self, rawTable, font):
|
|
ligatures = {}
|
|
if self.Format == 1:
|
|
input = _getGlyphsFromCoverageTable(rawTable["Coverage"])
|
|
ligSets = rawTable["LigatureSet"]
|
|
assert len(input) == len(ligSets)
|
|
for i in range(len(input)):
|
|
ligatures[input[i]] = ligSets[i].Ligature
|
|
else:
|
|
assert 0, "unknown format: %s" % self.Format
|
|
self.ligatures = ligatures
|
|
|
|
def preWrite(self, font):
|
|
self.Format = 1
|
|
ligatures = getattr(self, "ligatures", None)
|
|
if ligatures is None:
|
|
ligatures = self.ligatures = {}
|
|
|
|
if ligatures and isinstance(next(iter(ligatures)), tuple):
|
|
# New high-level API in v3.1 and later. Note that we just support compiling this
|
|
# for now. We don't load to this API, and don't do XML with it.
|
|
|
|
# ligatures is map from components-sequence to lig-glyph
|
|
newLigatures = dict()
|
|
for comps,lig in sorted(ligatures.items(), key=lambda item: (-len(item[0]), item[0])):
|
|
ligature = Ligature()
|
|
ligature.Component = comps[1:]
|
|
ligature.CompCount = len(comps)
|
|
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]
|
|
|
|
lookup.LookupType = extType
|
|
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
|
|
|
|
|
|
def splitPairPos(oldSubTable, newSubTable, overflowRecord):
|
|
st = oldSubTable
|
|
ok = False
|
|
newSubTable.Format = oldSubTable.Format
|
|
if oldSubTable.Format == 1 and len(oldSubTable.PairSet) > 1:
|
|
for name in 'ValueFormat1', 'ValueFormat2':
|
|
setattr(newSubTable, name, getattr(oldSubTable, name))
|
|
|
|
# Move top half of coverage to new subtable
|
|
|
|
newSubTable.Coverage = oldSubTable.Coverage.__class__()
|
|
|
|
coverage = oldSubTable.Coverage.glyphs
|
|
records = oldSubTable.PairSet
|
|
|
|
oldCount = len(oldSubTable.PairSet) // 2
|
|
|
|
oldSubTable.Coverage.glyphs = coverage[:oldCount]
|
|
oldSubTable.PairSet = records[:oldCount]
|
|
|
|
newSubTable.Coverage.glyphs = coverage[oldCount:]
|
|
newSubTable.PairSet = records[oldCount:]
|
|
|
|
oldSubTable.PairSetCount = len(oldSubTable.PairSet)
|
|
newSubTable.PairSetCount = len(newSubTable.PairSet)
|
|
|
|
ok = True
|
|
|
|
elif oldSubTable.Format == 2 and len(oldSubTable.Class1Record) > 1:
|
|
if not hasattr(oldSubTable, 'Class2Count'):
|
|
oldSubTable.Class2Count = len(oldSubTable.Class1Record[0].Class2Record)
|
|
for name in 'Class2Count', 'ClassDef2', 'ValueFormat1', 'ValueFormat2':
|
|
setattr(newSubTable, name, getattr(oldSubTable, name))
|
|
|
|
# The two subtables will still have the same ClassDef2 and the table
|
|
# sharing will still cause the sharing to overflow. As such, disable
|
|
# sharing on the one that is serialized second (that's oldSubTable).
|
|
oldSubTable.DontShare = True
|
|
|
|
# Move top half of class numbers to new subtable
|
|
|
|
newSubTable.Coverage = oldSubTable.Coverage.__class__()
|
|
newSubTable.ClassDef1 = oldSubTable.ClassDef1.__class__()
|
|
|
|
coverage = oldSubTable.Coverage.glyphs
|
|
classDefs = oldSubTable.ClassDef1.classDefs
|
|
records = oldSubTable.Class1Record
|
|
|
|
oldCount = len(oldSubTable.Class1Record) // 2
|
|
newGlyphs = set(k for k,v in classDefs.items() if v >= oldCount)
|
|
|
|
oldSubTable.Coverage.glyphs = [g for g in coverage if g not in newGlyphs]
|
|
oldSubTable.ClassDef1.classDefs = {k:v for k,v in classDefs.items() if v < oldCount}
|
|
oldSubTable.Class1Record = records[:oldCount]
|
|
|
|
newSubTable.Coverage.glyphs = [g for g in coverage if g in newGlyphs]
|
|
newSubTable.ClassDef1.classDefs = {k:(v-oldCount) for k,v in classDefs.items() if v > oldCount}
|
|
newSubTable.Class1Record = records[oldCount:]
|
|
|
|
oldSubTable.Class1Count = len(oldSubTable.Class1Record)
|
|
newSubTable.Class1Count = len(newSubTable.Class1Record)
|
|
|
|
ok = True
|
|
|
|
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]
|
|
|
|
# First, try not sharing anything for this subtable...
|
|
if not hasattr(subtable, "DontShare"):
|
|
subtable.DontShare = True
|
|
return True
|
|
|
|
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][extSubTable.__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,), {})
|
|
if name in ('GSUB', 'GPOS'):
|
|
cls.DontShare = True
|
|
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,
|
|
},
|
|
'mort': {
|
|
4: NoncontextualMorph,
|
|
},
|
|
'morx': {
|
|
0: RearrangementMorph,
|
|
1: ContextualMorph,
|
|
2: LigatureMorph,
|
|
# 3: Reserved,
|
|
4: NoncontextualMorph,
|
|
# 5: InsertionMorph,
|
|
},
|
|
}
|
|
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
|