/usr/lib/python3/dist-packages/fontTools/ttLib/tables/otConverters.py is in python3-fonttools 3.21.2-1.
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1622 1623 1624 1625 | from __future__ import print_function, division, absolute_import
from fontTools.misc.py23 import *
from fontTools.misc.fixedTools import (
fixedToFloat as fi2fl, floatToFixed as fl2fi, ensureVersionIsLong as fi2ve,
versionToFixed as ve2fi)
from fontTools.misc.textTools import pad, safeEval
from fontTools.ttLib import getSearchRange
from .otBase import (CountReference, FormatSwitchingBaseTable,
OTTableReader, OTTableWriter, ValueRecordFactory)
from .otTables import (lookupTypes, AATStateTable, AATState, AATAction,
ContextualMorphAction, LigatureMorphAction,
MorxSubtable)
from functools import partial
import struct
import logging
log = logging.getLogger(__name__)
istuple = lambda t: isinstance(t, tuple)
def buildConverters(tableSpec, tableNamespace):
"""Given a table spec from otData.py, build a converter object for each
field of the table. This is called for each table in otData.py, and
the results are assigned to the corresponding class in otTables.py."""
converters = []
convertersByName = {}
for tp, name, repeat, aux, descr in tableSpec:
tableName = name
if name.startswith("ValueFormat"):
assert tp == "uint16"
converterClass = ValueFormat
elif name.endswith("Count") or name in ("StructLength", "MorphType"):
converterClass = {
"uint8": ComputedUInt8,
"uint16": ComputedUShort,
"uint32": ComputedULong,
}[tp]
elif name == "SubTable":
converterClass = SubTable
elif name == "ExtSubTable":
converterClass = ExtSubTable
elif name == "SubStruct":
converterClass = SubStruct
elif name == "FeatureParams":
converterClass = FeatureParams
elif name in ("CIDGlyphMapping", "GlyphCIDMapping"):
converterClass = StructWithLength
else:
if not tp in converterMapping and '(' not in tp:
tableName = tp
converterClass = Struct
else:
converterClass = eval(tp, tableNamespace, converterMapping)
if tp in ('MortChain', 'MortSubtable', 'MorxChain'):
tableClass = tableNamespace.get(tp)
else:
tableClass = tableNamespace.get(tableName)
if tableClass is not None:
conv = converterClass(name, repeat, aux, tableClass=tableClass)
else:
conv = converterClass(name, repeat, aux)
if name in ["SubTable", "ExtSubTable", "SubStruct"]:
conv.lookupTypes = tableNamespace['lookupTypes']
# also create reverse mapping
for t in conv.lookupTypes.values():
for cls in t.values():
convertersByName[cls.__name__] = Table(name, repeat, aux, cls)
if name == "FeatureParams":
conv.featureParamTypes = tableNamespace['featureParamTypes']
conv.defaultFeatureParams = tableNamespace['FeatureParams']
for cls in conv.featureParamTypes.values():
convertersByName[cls.__name__] = Table(name, repeat, aux, cls)
converters.append(conv)
assert name not in convertersByName, name
convertersByName[name] = conv
return converters, convertersByName
class _MissingItem(tuple):
__slots__ = ()
try:
from collections import UserList
except ImportError:
from UserList import UserList
class _LazyList(UserList):
def __getslice__(self, i, j):
return self.__getitem__(slice(i, j))
def __getitem__(self, k):
if isinstance(k, slice):
indices = range(*k.indices(len(self)))
return [self[i] for i in indices]
item = self.data[k]
if isinstance(item, _MissingItem):
self.reader.seek(self.pos + item[0] * self.recordSize)
item = self.conv.read(self.reader, self.font, {})
self.data[k] = item
return item
def __add__(self, other):
if isinstance(other, _LazyList):
other = list(other)
elif isinstance(other, list):
pass
else:
return NotImplemented
return list(self) + other
def __radd__(self, other):
if not isinstance(other, list):
return NotImplemented
return other + list(self)
class BaseConverter(object):
"""Base class for converter objects. Apart from the constructor, this
is an abstract class."""
def __init__(self, name, repeat, aux, tableClass=None):
self.name = name
self.repeat = repeat
self.aux = aux
self.tableClass = tableClass
self.isCount = name.endswith("Count") or name in ['DesignAxisRecordSize', 'ValueRecordSize']
self.isLookupType = name.endswith("LookupType") or name == "MorphType"
self.isPropagated = name in ["ClassCount", "Class2Count", "FeatureTag", "SettingsCount", "VarRegionCount", "MappingCount", "RegionAxisCount", 'DesignAxisCount', 'DesignAxisRecordSize', 'AxisValueCount', 'ValueRecordSize']
def readArray(self, reader, font, tableDict, count):
"""Read an array of values from the reader."""
lazy = font.lazy and count > 8
if lazy:
recordSize = self.getRecordSize(reader)
if recordSize is NotImplemented:
lazy = False
if not lazy:
l = []
for i in range(count):
l.append(self.read(reader, font, tableDict))
return l
else:
l = _LazyList()
l.reader = reader.copy()
l.pos = l.reader.pos
l.font = font
l.conv = self
l.recordSize = recordSize
l.extend(_MissingItem([i]) for i in range(count))
reader.advance(count * recordSize)
return l
def getRecordSize(self, reader):
if hasattr(self, 'staticSize'): return self.staticSize
return NotImplemented
def read(self, reader, font, tableDict):
"""Read a value from the reader."""
raise NotImplementedError(self)
def writeArray(self, writer, font, tableDict, values):
for i, value in enumerate(values):
self.write(writer, font, tableDict, value, i)
def write(self, writer, font, tableDict, value, repeatIndex=None):
"""Write a value to the writer."""
raise NotImplementedError(self)
def xmlRead(self, attrs, content, font):
"""Read a value from XML."""
raise NotImplementedError(self)
def xmlWrite(self, xmlWriter, font, value, name, attrs):
"""Write a value to XML."""
raise NotImplementedError(self)
class SimpleValue(BaseConverter):
def xmlWrite(self, xmlWriter, font, value, name, attrs):
xmlWriter.simpletag(name, attrs + [("value", value)])
xmlWriter.newline()
def xmlRead(self, attrs, content, font):
return attrs["value"]
class IntValue(SimpleValue):
def xmlRead(self, attrs, content, font):
return int(attrs["value"], 0)
class Long(IntValue):
staticSize = 4
def read(self, reader, font, tableDict):
return reader.readLong()
def write(self, writer, font, tableDict, value, repeatIndex=None):
writer.writeLong(value)
class ULong(IntValue):
staticSize = 4
def read(self, reader, font, tableDict):
return reader.readULong()
def write(self, writer, font, tableDict, value, repeatIndex=None):
writer.writeULong(value)
class Flags32(ULong):
def xmlWrite(self, xmlWriter, font, value, name, attrs):
xmlWriter.simpletag(name, attrs + [("value", "0x%08X" % value)])
xmlWriter.newline()
class Short(IntValue):
staticSize = 2
def read(self, reader, font, tableDict):
return reader.readShort()
def write(self, writer, font, tableDict, value, repeatIndex=None):
writer.writeShort(value)
class UShort(IntValue):
staticSize = 2
def read(self, reader, font, tableDict):
return reader.readUShort()
def write(self, writer, font, tableDict, value, repeatIndex=None):
writer.writeUShort(value)
class Int8(IntValue):
staticSize = 1
def read(self, reader, font, tableDict):
return reader.readInt8()
def write(self, writer, font, tableDict, value, repeatIndex=None):
writer.writeInt8(value)
class UInt8(IntValue):
staticSize = 1
def read(self, reader, font, tableDict):
return reader.readUInt8()
def write(self, writer, font, tableDict, value, repeatIndex=None):
writer.writeUInt8(value)
class UInt24(IntValue):
staticSize = 3
def read(self, reader, font, tableDict):
return reader.readUInt24()
def write(self, writer, font, tableDict, value, repeatIndex=None):
writer.writeUInt24(value)
class ComputedInt(IntValue):
def xmlWrite(self, xmlWriter, font, value, name, attrs):
if value is not None:
xmlWriter.comment("%s=%s" % (name, value))
xmlWriter.newline()
class ComputedUInt8(ComputedInt, UInt8):
pass
class ComputedUShort(ComputedInt, UShort):
pass
class ComputedULong(ComputedInt, ULong):
pass
class Tag(SimpleValue):
staticSize = 4
def read(self, reader, font, tableDict):
return reader.readTag()
def write(self, writer, font, tableDict, value, repeatIndex=None):
writer.writeTag(value)
class GlyphID(SimpleValue):
staticSize = 2
def readArray(self, reader, font, tableDict, count):
glyphOrder = font.getGlyphOrder()
gids = reader.readUShortArray(count)
try:
l = [glyphOrder[gid] for gid in gids]
except IndexError:
# Slower, but will not throw an IndexError on an invalid glyph id.
l = [font.getGlyphName(gid) for gid in gids]
return l
def read(self, reader, font, tableDict):
return font.getGlyphName(reader.readUShort())
def write(self, writer, font, tableDict, value, repeatIndex=None):
writer.writeUShort(font.getGlyphID(value))
class NameID(UShort):
def xmlWrite(self, xmlWriter, font, value, name, attrs):
xmlWriter.simpletag(name, attrs + [("value", value)])
nameTable = font.get("name") if font else None
if nameTable:
name = nameTable.getDebugName(value)
xmlWriter.write(" ")
if name:
xmlWriter.comment(name)
else:
xmlWriter.comment("missing from name table")
log.warning("name id %d missing from name table" % value)
xmlWriter.newline()
class FloatValue(SimpleValue):
def xmlRead(self, attrs, content, font):
return float(attrs["value"])
class DeciPoints(FloatValue):
staticSize = 2
def read(self, reader, font, tableDict):
return reader.readUShort() / 10
def write(self, writer, font, tableDict, value, repeatIndex=None):
writer.writeUShort(round(value * 10))
class Fixed(FloatValue):
staticSize = 4
def read(self, reader, font, tableDict):
return fi2fl(reader.readLong(), 16)
def write(self, writer, font, tableDict, value, repeatIndex=None):
writer.writeLong(fl2fi(value, 16))
class F2Dot14(FloatValue):
staticSize = 2
def read(self, reader, font, tableDict):
return fi2fl(reader.readShort(), 14)
def write(self, writer, font, tableDict, value, repeatIndex=None):
writer.writeShort(fl2fi(value, 14))
class Version(BaseConverter):
staticSize = 4
def read(self, reader, font, tableDict):
value = reader.readLong()
assert (value >> 16) == 1, "Unsupported version 0x%08x" % value
return value
def write(self, writer, font, tableDict, value, repeatIndex=None):
value = fi2ve(value)
assert (value >> 16) == 1, "Unsupported version 0x%08x" % value
writer.writeLong(value)
def xmlRead(self, attrs, content, font):
value = attrs["value"]
value = ve2fi(value)
return value
def xmlWrite(self, xmlWriter, font, value, name, attrs):
value = fi2ve(value)
value = "0x%08x" % value
xmlWriter.simpletag(name, attrs + [("value", value)])
xmlWriter.newline()
@staticmethod
def fromFloat(v):
return fl2fi(v, 16)
class Char64(SimpleValue):
"""An ASCII string with up to 64 characters.
Unused character positions are filled with 0x00 bytes.
Used in Apple AAT fonts in the `gcid` table.
"""
staticSize = 64
def read(self, reader, font, tableDict):
data = reader.readData(self.staticSize)
zeroPos = data.find(b"\0")
if zeroPos >= 0:
data = data[:zeroPos]
s = tounicode(data, encoding="ascii", errors="replace")
if s != tounicode(data, encoding="ascii", errors="ignore"):
log.warning('replaced non-ASCII characters in "%s"' %
s)
return s
def write(self, writer, font, tableDict, value, repeatIndex=None):
data = tobytes(value, encoding="ascii", errors="replace")
if data != tobytes(value, encoding="ascii", errors="ignore"):
log.warning('replacing non-ASCII characters in "%s"' %
value)
if len(data) > self.staticSize:
log.warning('truncating overlong "%s" to %d bytes' %
(value, self.staticSize))
data = (data + b"\0" * self.staticSize)[:self.staticSize]
writer.writeData(data)
class Struct(BaseConverter):
def getRecordSize(self, reader):
return self.tableClass and self.tableClass.getRecordSize(reader)
def read(self, reader, font, tableDict):
table = self.tableClass()
table.decompile(reader, font)
return table
def write(self, writer, font, tableDict, value, repeatIndex=None):
value.compile(writer, font)
def xmlWrite(self, xmlWriter, font, value, name, attrs):
if value is None:
if attrs:
# If there are attributes (probably index), then
# don't drop this even if it's NULL. It will mess
# up the array indices of the containing element.
xmlWriter.simpletag(name, attrs + [("empty", 1)])
xmlWriter.newline()
else:
pass # NULL table, ignore
else:
value.toXML(xmlWriter, font, attrs, name=name)
def xmlRead(self, attrs, content, font):
if "empty" in attrs and safeEval(attrs["empty"]):
return None
table = self.tableClass()
Format = attrs.get("Format")
if Format is not None:
table.Format = int(Format)
noPostRead = not hasattr(table, 'postRead')
if noPostRead:
# TODO Cache table.hasPropagated.
cleanPropagation = False
for conv in table.getConverters():
if conv.isPropagated:
cleanPropagation = True
if not hasattr(font, '_propagator'):
font._propagator = {}
propagator = font._propagator
assert conv.name not in propagator, (conv.name, propagator)
setattr(table, conv.name, None)
propagator[conv.name] = CountReference(table.__dict__, conv.name)
for element in content:
if isinstance(element, tuple):
name, attrs, content = element
table.fromXML(name, attrs, content, font)
else:
pass
table.populateDefaults(propagator=getattr(font, '_propagator', None))
if noPostRead:
if cleanPropagation:
for conv in table.getConverters():
if conv.isPropagated:
propagator = font._propagator
del propagator[conv.name]
if not propagator:
del font._propagator
return table
def __repr__(self):
return "Struct of " + repr(self.tableClass)
class StructWithLength(Struct):
def read(self, reader, font, tableDict):
pos = reader.pos
table = self.tableClass()
table.decompile(reader, font)
reader.seek(pos + table.StructLength)
return table
def write(self, writer, font, tableDict, value, repeatIndex=None):
for convIndex, conv in enumerate(value.getConverters()):
if conv.name == "StructLength":
break
lengthIndex = len(writer.items) + convIndex
if isinstance(value, FormatSwitchingBaseTable):
lengthIndex += 1 # implicit Format field
deadbeef = {1:0xDE, 2:0xDEAD, 4:0xDEADBEEF}[conv.staticSize]
before = writer.getDataLength()
value.StructLength = deadbeef
value.compile(writer, font)
length = writer.getDataLength() - before
lengthWriter = writer.getSubWriter()
conv.write(lengthWriter, font, tableDict, length)
assert(writer.items[lengthIndex] ==
b"\xde\xad\xbe\xef"[:conv.staticSize])
writer.items[lengthIndex] = lengthWriter.getAllData()
class Table(Struct):
longOffset = False
staticSize = 2
def readOffset(self, reader):
return reader.readUShort()
def writeNullOffset(self, writer):
if self.longOffset:
writer.writeULong(0)
else:
writer.writeUShort(0)
def read(self, reader, font, tableDict):
offset = self.readOffset(reader)
if offset == 0:
return None
table = self.tableClass()
reader = reader.getSubReader(offset)
if font.lazy:
table.reader = reader
table.font = font
else:
table.decompile(reader, font)
return table
def write(self, writer, font, tableDict, value, repeatIndex=None):
if value is None:
self.writeNullOffset(writer)
else:
subWriter = writer.getSubWriter()
subWriter.longOffset = self.longOffset
subWriter.name = self.name
if repeatIndex is not None:
subWriter.repeatIndex = repeatIndex
writer.writeSubTable(subWriter)
value.compile(subWriter, font)
class LTable(Table):
longOffset = True
staticSize = 4
def readOffset(self, reader):
return reader.readULong()
# TODO Clean / merge the SubTable and SubStruct
class SubStruct(Struct):
def getConverter(self, tableType, lookupType):
tableClass = self.lookupTypes[tableType][lookupType]
return self.__class__(self.name, self.repeat, self.aux, tableClass)
def xmlWrite(self, xmlWriter, font, value, name, attrs):
super(SubStruct, self).xmlWrite(xmlWriter, font, value, None, attrs)
class SubTable(Table):
def getConverter(self, tableType, lookupType):
tableClass = self.lookupTypes[tableType][lookupType]
return self.__class__(self.name, self.repeat, self.aux, tableClass)
def xmlWrite(self, xmlWriter, font, value, name, attrs):
super(SubTable, self).xmlWrite(xmlWriter, font, value, None, attrs)
class ExtSubTable(LTable, SubTable):
def write(self, writer, font, tableDict, value, repeatIndex=None):
writer.Extension = True # actually, mere presence of the field flags it as an Ext Subtable writer.
Table.write(self, writer, font, tableDict, value, repeatIndex)
class FeatureParams(Table):
def getConverter(self, featureTag):
tableClass = self.featureParamTypes.get(featureTag, self.defaultFeatureParams)
return self.__class__(self.name, self.repeat, self.aux, tableClass)
class ValueFormat(IntValue):
staticSize = 2
def __init__(self, name, repeat, aux, tableClass=None):
BaseConverter.__init__(self, name, repeat, aux, tableClass)
self.which = "ValueFormat" + ("2" if name[-1] == "2" else "1")
def read(self, reader, font, tableDict):
format = reader.readUShort()
reader[self.which] = ValueRecordFactory(format)
return format
def write(self, writer, font, tableDict, format, repeatIndex=None):
writer.writeUShort(format)
writer[self.which] = ValueRecordFactory(format)
class ValueRecord(ValueFormat):
def getRecordSize(self, reader):
return 2 * len(reader[self.which])
def read(self, reader, font, tableDict):
return reader[self.which].readValueRecord(reader, font)
def write(self, writer, font, tableDict, value, repeatIndex=None):
writer[self.which].writeValueRecord(writer, font, value)
def xmlWrite(self, xmlWriter, font, value, name, attrs):
if value is None:
pass # NULL table, ignore
else:
value.toXML(xmlWriter, font, self.name, attrs)
def xmlRead(self, attrs, content, font):
from .otBase import ValueRecord
value = ValueRecord()
value.fromXML(None, attrs, content, font)
return value
class AATLookup(BaseConverter):
BIN_SEARCH_HEADER_SIZE = 10
def __init__(self, name, repeat, aux, tableClass):
BaseConverter.__init__(self, name, repeat, aux, tableClass)
if issubclass(self.tableClass, SimpleValue):
self.converter = self.tableClass(name='Value', repeat=None, aux=None)
else:
self.converter = Table(name='Value', repeat=None, aux=None, tableClass=self.tableClass)
def read(self, reader, font, tableDict):
format = reader.readUShort()
if format == 0:
return self.readFormat0(reader, font)
elif format == 2:
return self.readFormat2(reader, font)
elif format == 4:
return self.readFormat4(reader, font)
elif format == 6:
return self.readFormat6(reader, font)
elif format == 8:
return self.readFormat8(reader, font)
else:
assert False, "unsupported lookup format: %d" % format
def write(self, writer, font, tableDict, value, repeatIndex=None):
values = list(sorted([(font.getGlyphID(glyph), val)
for glyph, val in value.items()]))
# TODO: Also implement format 4.
formats = list(sorted(filter(None, [
self.buildFormat0(writer, font, values),
self.buildFormat2(writer, font, values),
self.buildFormat6(writer, font, values),
self.buildFormat8(writer, font, values),
])))
# We use the format ID as secondary sort key to make the output
# deterministic when multiple formats have same encoded size.
dataSize, lookupFormat, writeMethod = formats[0]
pos = writer.getDataLength()
writeMethod()
actualSize = writer.getDataLength() - pos
assert actualSize == dataSize, (
"AATLookup format %d claimed to write %d bytes, but wrote %d" %
(lookupFormat, dataSize, actualSize))
@staticmethod
def writeBinSearchHeader(writer, numUnits, unitSize):
writer.writeUShort(unitSize)
writer.writeUShort(numUnits)
searchRange, entrySelector, rangeShift = \
getSearchRange(n=numUnits, itemSize=unitSize)
writer.writeUShort(searchRange)
writer.writeUShort(entrySelector)
writer.writeUShort(rangeShift)
def buildFormat0(self, writer, font, values):
numGlyphs = len(font.getGlyphOrder())
if len(values) != numGlyphs:
return None
valueSize = self.converter.staticSize
return (2 + numGlyphs * valueSize, 0,
lambda: self.writeFormat0(writer, font, values))
def writeFormat0(self, writer, font, values):
writer.writeUShort(0)
for glyphID_, value in values:
self.converter.write(
writer, font, tableDict=None,
value=value, repeatIndex=None)
def buildFormat2(self, writer, font, values):
segStart, segValue = values[0]
segEnd = segStart
segments = []
for glyphID, curValue in values[1:]:
if glyphID != segEnd + 1 or curValue != segValue:
segments.append((segStart, segEnd, segValue))
segStart = segEnd = glyphID
segValue = curValue
else:
segEnd = glyphID
segments.append((segStart, segEnd, segValue))
valueSize = self.converter.staticSize
numUnits, unitSize = len(segments) + 1, valueSize + 4
return (2 + self.BIN_SEARCH_HEADER_SIZE + numUnits * unitSize, 2,
lambda: self.writeFormat2(writer, font, segments))
def writeFormat2(self, writer, font, segments):
writer.writeUShort(2)
valueSize = self.converter.staticSize
numUnits, unitSize = len(segments), valueSize + 4
self.writeBinSearchHeader(writer, numUnits, unitSize)
for firstGlyph, lastGlyph, value in segments:
writer.writeUShort(lastGlyph)
writer.writeUShort(firstGlyph)
self.converter.write(
writer, font, tableDict=None,
value=value, repeatIndex=None)
writer.writeUShort(0xFFFF)
writer.writeUShort(0xFFFF)
writer.writeData(b'\x00' * valueSize)
def buildFormat6(self, writer, font, values):
valueSize = self.converter.staticSize
numUnits, unitSize = len(values), valueSize + 2
return (2 + self.BIN_SEARCH_HEADER_SIZE + (numUnits + 1) * unitSize, 6,
lambda: self.writeFormat6(writer, font, values))
def writeFormat6(self, writer, font, values):
writer.writeUShort(6)
valueSize = self.converter.staticSize
numUnits, unitSize = len(values), valueSize + 2
self.writeBinSearchHeader(writer, numUnits, unitSize)
for glyphID, value in values:
writer.writeUShort(glyphID)
self.converter.write(
writer, font, tableDict=None,
value=value, repeatIndex=None)
writer.writeUShort(0xFFFF)
writer.writeData(b'\x00' * valueSize)
def buildFormat8(self, writer, font, values):
minGlyphID, maxGlyphID = values[0][0], values[-1][0]
if len(values) != maxGlyphID - minGlyphID + 1:
return None
valueSize = self.converter.staticSize
return (6 + len(values) * valueSize, 8,
lambda: self.writeFormat8(writer, font, values))
def writeFormat8(self, writer, font, values):
firstGlyphID = values[0][0]
writer.writeUShort(8)
writer.writeUShort(firstGlyphID)
writer.writeUShort(len(values))
for _, value in values:
self.converter.write(
writer, font, tableDict=None,
value=value, repeatIndex=None)
def readFormat0(self, reader, font):
numGlyphs = len(font.getGlyphOrder())
data = self.converter.readArray(
reader, font, tableDict=None, count=numGlyphs)
return {font.getGlyphName(k): value
for k, value in enumerate(data)}
def readFormat2(self, reader, font):
mapping = {}
pos = reader.pos - 2 # start of table is at UShort for format
unitSize, numUnits = reader.readUShort(), reader.readUShort()
assert unitSize >= 4 + self.converter.staticSize, unitSize
for i in range(numUnits):
reader.seek(pos + i * unitSize + 12)
last = reader.readUShort()
first = reader.readUShort()
value = self.converter.read(reader, font, tableDict=None)
if last != 0xFFFF:
for k in range(first, last + 1):
mapping[font.getGlyphName(k)] = value
return mapping
def readFormat4(self, reader, font):
mapping = {}
pos = reader.pos - 2 # start of table is at UShort for format
unitSize = reader.readUShort()
assert unitSize >= 6, unitSize
for i in range(reader.readUShort()):
reader.seek(pos + i * unitSize + 12)
last = reader.readUShort()
first = reader.readUShort()
offset = reader.readUShort()
if last != 0xFFFF:
dataReader = reader.getSubReader(0) # relative to current position
dataReader.seek(pos + offset) # relative to start of table
data = self.converter.readArray(
dataReader, font, tableDict=None,
count=last - first + 1)
for k, v in enumerate(data):
mapping[font.getGlyphName(first + k)] = v
return mapping
def readFormat6(self, reader, font):
mapping = {}
pos = reader.pos - 2 # start of table is at UShort for format
unitSize = reader.readUShort()
assert unitSize >= 2 + self.converter.staticSize, unitSize
for i in range(reader.readUShort()):
reader.seek(pos + i * unitSize + 12)
glyphID = reader.readUShort()
value = self.converter.read(
reader, font, tableDict=None)
if glyphID != 0xFFFF:
mapping[font.getGlyphName(glyphID)] = value
return mapping
def readFormat8(self, reader, font):
first = reader.readUShort()
count = reader.readUShort()
data = self.converter.readArray(
reader, font, tableDict=None, count=count)
return {font.getGlyphName(first + k): value
for (k, value) in enumerate(data)}
def xmlRead(self, attrs, content, font):
value = {}
for element in content:
if isinstance(element, tuple):
name, a, eltContent = element
if name == "Lookup":
value[a["glyph"]] = self.converter.xmlRead(a, eltContent, font)
return value
def xmlWrite(self, xmlWriter, font, value, name, attrs):
xmlWriter.begintag(name, attrs)
xmlWriter.newline()
for glyph, value in sorted(value.items()):
self.converter.xmlWrite(
xmlWriter, font, value=value,
name="Lookup", attrs=[("glyph", glyph)])
xmlWriter.endtag(name)
xmlWriter.newline()
# The AAT 'ankr' table has an unusual structure: An offset to an AATLookup
# followed by an offset to a glyph data table. Other than usual, the
# offsets in the AATLookup are not relative to the beginning of
# the beginning of the 'ankr' table, but relative to the glyph data table.
# So, to find the anchor data for a glyph, one needs to add the offset
# to the data table to the offset found in the AATLookup, and then use
# the sum of these two offsets to find the actual data.
class AATLookupWithDataOffset(BaseConverter):
def read(self, reader, font, tableDict):
lookupOffset = reader.readULong()
dataOffset = reader.readULong()
lookupReader = reader.getSubReader(lookupOffset)
lookup = AATLookup('DataOffsets', None, None, UShort)
offsets = lookup.read(lookupReader, font, tableDict)
result = {}
for glyph, offset in offsets.items():
dataReader = reader.getSubReader(offset + dataOffset)
item = self.tableClass()
item.decompile(dataReader, font)
result[glyph] = item
return result
def write(self, writer, font, tableDict, value, repeatIndex=None):
# We do not work with OTTableWriter sub-writers because
# the offsets in our AATLookup are relative to our data
# table, for which we need to provide an offset value itself.
# It might have been possible to somehow make a kludge for
# performing this indirect offset computation directly inside
# OTTableWriter. But this would have made the internal logic
# of OTTableWriter even more complex than it already is,
# so we decided to roll our own offset computation for the
# contents of the AATLookup and associated data table.
offsetByGlyph, offsetByData, dataLen = {}, {}, 0
compiledData = []
for glyph in sorted(value, key=font.getGlyphID):
subWriter = OTTableWriter()
value[glyph].compile(subWriter, font)
data = subWriter.getAllData()
offset = offsetByData.get(data, None)
if offset == None:
offset = dataLen
dataLen = dataLen + len(data)
offsetByData[data] = offset
compiledData.append(data)
offsetByGlyph[glyph] = offset
# For calculating the offsets to our AATLookup and data table,
# we can use the regular OTTableWriter infrastructure.
lookupWriter = writer.getSubWriter()
lookupWriter.longOffset = True
lookup = AATLookup('DataOffsets', None, None, UShort)
lookup.write(lookupWriter, font, tableDict, offsetByGlyph, None)
dataWriter = writer.getSubWriter()
dataWriter.longOffset = True
writer.writeSubTable(lookupWriter)
writer.writeSubTable(dataWriter)
for d in compiledData:
dataWriter.writeData(d)
def xmlRead(self, attrs, content, font):
lookup = AATLookup('DataOffsets', None, None, self.tableClass)
return lookup.xmlRead(attrs, content, font)
def xmlWrite(self, xmlWriter, font, value, name, attrs):
lookup = AATLookup('DataOffsets', None, None, self.tableClass)
lookup.xmlWrite(xmlWriter, font, value, name, attrs)
class MorxSubtableConverter(BaseConverter):
_PROCESSING_ORDERS = {
# bits 30 and 28 of morx.CoverageFlags; see morx spec
(False, False): "LayoutOrder",
(True, False): "ReversedLayoutOrder",
(False, True): "LogicalOrder",
(True, True): "ReversedLogicalOrder",
}
_PROCESSING_ORDERS_REVERSED = {
val: key for key, val in _PROCESSING_ORDERS.items()
}
def __init__(self, name, repeat, aux):
BaseConverter.__init__(self, name, repeat, aux)
def _setTextDirectionFromCoverageFlags(self, flags, subtable):
if (flags & 0x20) != 0:
subtable.TextDirection = "Any"
elif (flags & 0x80) != 0:
subtable.TextDirection = "Vertical"
else:
subtable.TextDirection = "Horizontal"
def read(self, reader, font, tableDict):
pos = reader.pos
m = MorxSubtable()
m.StructLength = reader.readULong()
flags = reader.readUInt8()
orderKey = ((flags & 0x40) != 0, (flags & 0x10) != 0)
m.ProcessingOrder = self._PROCESSING_ORDERS[orderKey]
self._setTextDirectionFromCoverageFlags(flags, m)
m.Reserved = reader.readUShort()
m.Reserved |= (flags & 0xF) << 16
m.MorphType = reader.readUInt8()
m.SubFeatureFlags = reader.readULong()
tableClass = lookupTypes["morx"].get(m.MorphType)
if tableClass is None:
assert False, ("unsupported 'morx' lookup type %s" %
m.MorphType)
# To decode AAT ligatures, we need to know the subtable size.
# The easiest way to pass this along is to create a new reader
# that works on just the subtable as its data.
headerLength = reader.pos - pos
data = reader.data[
reader.pos
: reader.pos + m.StructLength - headerLength]
assert len(data) == m.StructLength - headerLength
subReader = OTTableReader(data=data, tableTag=reader.tableTag)
m.SubStruct = tableClass()
m.SubStruct.decompile(subReader, font)
reader.seek(pos + m.StructLength)
return m
def xmlWrite(self, xmlWriter, font, value, name, attrs):
xmlWriter.begintag(name, attrs)
xmlWriter.newline()
xmlWriter.comment("StructLength=%d" % value.StructLength)
xmlWriter.newline()
xmlWriter.simpletag("TextDirection", value=value.TextDirection)
xmlWriter.newline()
xmlWriter.simpletag("ProcessingOrder",
value=value.ProcessingOrder)
xmlWriter.newline()
if value.Reserved != 0:
xmlWriter.simpletag("Reserved",
value="0x%04x" % value.Reserved)
xmlWriter.newline()
xmlWriter.comment("MorphType=%d" % value.MorphType)
xmlWriter.newline()
xmlWriter.simpletag("SubFeatureFlags",
value="0x%08x" % value.SubFeatureFlags)
xmlWriter.newline()
value.SubStruct.toXML(xmlWriter, font)
xmlWriter.endtag(name)
xmlWriter.newline()
def xmlRead(self, attrs, content, font):
m = MorxSubtable()
covFlags = 0
m.Reserved = 0
for eltName, eltAttrs, eltContent in filter(istuple, content):
if eltName == "CoverageFlags":
# Only in XML from old versions of fonttools.
covFlags = safeEval(eltAttrs["value"])
orderKey = ((covFlags & 0x40) != 0,
(covFlags & 0x10) != 0)
m.ProcessingOrder = self._PROCESSING_ORDERS[
orderKey]
self._setTextDirectionFromCoverageFlags(
covFlags, m)
elif eltName == "ProcessingOrder":
m.ProcessingOrder = eltAttrs["value"]
assert m.ProcessingOrder in self._PROCESSING_ORDERS_REVERSED, "unknown ProcessingOrder: %s" % m.ProcessingOrder
elif eltName == "TextDirection":
m.TextDirection = eltAttrs["value"]
assert m.TextDirection in {"Horizontal", "Vertical", "Any"}, "unknown TextDirection %s" % m.TextDirection
elif eltName == "Reserved":
m.Reserved = safeEval(eltAttrs["value"])
elif eltName == "SubFeatureFlags":
m.SubFeatureFlags = safeEval(eltAttrs["value"])
elif eltName.endswith("Morph"):
m.fromXML(eltName, eltAttrs, eltContent, font)
else:
assert False, eltName
m.Reserved = (covFlags & 0xF) << 16 | m.Reserved
return m
def write(self, writer, font, tableDict, value, repeatIndex=None):
covFlags = (value.Reserved & 0x000F0000) >> 16
reverseOrder, logicalOrder = self._PROCESSING_ORDERS_REVERSED[
value.ProcessingOrder]
covFlags |= 0x80 if value.TextDirection == "Vertical" else 0
covFlags |= 0x40 if reverseOrder else 0
covFlags |= 0x20 if value.TextDirection == "Any" else 0
covFlags |= 0x10 if logicalOrder else 0
value.CoverageFlags = covFlags
lengthIndex = len(writer.items)
before = writer.getDataLength()
value.StructLength = 0xdeadbeef
# The high nibble of value.Reserved is actuallly encoded
# into coverageFlags, so we need to clear it here.
origReserved = value.Reserved # including high nibble
value.Reserved = value.Reserved & 0xFFFF # without high nibble
value.compile(writer, font)
value.Reserved = origReserved # restore original value
assert writer.items[lengthIndex] == b"\xde\xad\xbe\xef"
length = writer.getDataLength() - before
writer.items[lengthIndex] = struct.pack(">L", length)
# https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6Tables.html#ExtendedStateHeader
# TODO: Untangle the implementation of the various lookup-specific formats.
class STXHeader(BaseConverter):
def __init__(self, name, repeat, aux, tableClass):
BaseConverter.__init__(self, name, repeat, aux, tableClass)
assert issubclass(self.tableClass, AATAction)
self.classLookup = AATLookup("GlyphClasses", None, None, UShort)
if issubclass(self.tableClass, ContextualMorphAction):
self.perGlyphLookup = AATLookup("PerGlyphLookup",
None, None, GlyphID)
else:
self.perGlyphLookup = None
def read(self, reader, font, tableDict):
table = AATStateTable()
pos = reader.pos
classTableReader = reader.getSubReader(0)
stateArrayReader = reader.getSubReader(0)
entryTableReader = reader.getSubReader(0)
actionReader = None
ligaturesReader = None
table.GlyphClassCount = reader.readULong()
classTableReader.seek(pos + reader.readULong())
stateArrayReader.seek(pos + reader.readULong())
entryTableReader.seek(pos + reader.readULong())
if self.perGlyphLookup is not None:
perGlyphTableReader = reader.getSubReader(0)
perGlyphTableReader.seek(pos + reader.readULong())
if issubclass(self.tableClass, LigatureMorphAction):
actionReader = reader.getSubReader(0)
actionReader.seek(pos + reader.readULong())
ligComponentReader = reader.getSubReader(0)
ligComponentReader.seek(pos + reader.readULong())
ligaturesReader = reader.getSubReader(0)
ligaturesReader.seek(pos + reader.readULong())
numLigComponents = (ligaturesReader.pos
- ligComponentReader.pos) // 2
assert numLigComponents >= 0
table.LigComponents = \
ligComponentReader.readUShortArray(numLigComponents)
table.Ligatures = self._readLigatures(ligaturesReader, font)
table.GlyphClasses = self.classLookup.read(classTableReader,
font, tableDict)
numStates = int((entryTableReader.pos - stateArrayReader.pos)
/ (table.GlyphClassCount * 2))
for stateIndex in range(numStates):
state = AATState()
table.States.append(state)
for glyphClass in range(table.GlyphClassCount):
entryIndex = stateArrayReader.readUShort()
state.Transitions[glyphClass] = \
self._readTransition(entryTableReader,
entryIndex, font,
actionReader)
if self.perGlyphLookup is not None:
table.PerGlyphLookups = self._readPerGlyphLookups(
table, perGlyphTableReader, font)
return table
def _readTransition(self, reader, entryIndex, font, actionReader):
transition = self.tableClass()
entryReader = reader.getSubReader(
reader.pos + entryIndex * transition.staticSize)
transition.decompile(entryReader, font, actionReader)
return transition
def _readLigatures(self, reader, font):
limit = len(reader.data)
numLigatureGlyphs = (limit - reader.pos) // 2
return [font.getGlyphName(g)
for g in reader.readUShortArray(numLigatureGlyphs)]
def _countPerGlyphLookups(self, table):
# Somewhat annoyingly, the morx table does not encode
# the size of the per-glyph table. So we need to find
# the maximum value that MorphActions use as index
# into this table.
numLookups = 0
for state in table.States:
for t in state.Transitions.values():
if isinstance(t, ContextualMorphAction):
if t.MarkIndex != 0xFFFF:
numLookups = max(
numLookups,
t.MarkIndex + 1)
if t.CurrentIndex != 0xFFFF:
numLookups = max(
numLookups,
t.CurrentIndex + 1)
return numLookups
def _readPerGlyphLookups(self, table, reader, font):
pos = reader.pos
lookups = []
for _ in range(self._countPerGlyphLookups(table)):
lookupReader = reader.getSubReader(0)
lookupReader.seek(pos + reader.readULong())
lookups.append(
self.perGlyphLookup.read(lookupReader, font, {}))
return lookups
def write(self, writer, font, tableDict, value, repeatIndex=None):
glyphClassWriter = OTTableWriter()
self.classLookup.write(glyphClassWriter, font, tableDict,
value.GlyphClasses, repeatIndex=None)
glyphClassData = pad(glyphClassWriter.getAllData(), 4)
glyphClassCount = max(value.GlyphClasses.values()) + 1
glyphClassTableOffset = 16 # size of STXHeader
if self.perGlyphLookup is not None:
glyphClassTableOffset += 4
actionData, actionIndex = None, None
if issubclass(self.tableClass, LigatureMorphAction):
glyphClassTableOffset += 12
actionData, actionIndex = \
self._compileLigActions(value, font)
actionData = pad(actionData, 4)
stateArrayData, entryTableData = self._compileStates(
font, value.States, glyphClassCount, actionIndex)
stateArrayOffset = glyphClassTableOffset + len(glyphClassData)
entryTableOffset = stateArrayOffset + len(stateArrayData)
perGlyphOffset = entryTableOffset + len(entryTableData)
perGlyphData = \
pad(self._compilePerGlyphLookups(value, font), 4)
ligComponentsData = self._compileLigComponents(value, font)
ligaturesData = self._compileLigatures(value, font)
if actionData is None:
actionOffset = None
ligComponentsOffset = None
ligaturesOffset = None
else:
assert len(perGlyphData) == 0
actionOffset = entryTableOffset + len(entryTableData)
ligComponentsOffset = actionOffset + len(actionData)
ligaturesOffset = ligComponentsOffset + len(ligComponentsData)
writer.writeULong(glyphClassCount)
writer.writeULong(glyphClassTableOffset)
writer.writeULong(stateArrayOffset)
writer.writeULong(entryTableOffset)
if self.perGlyphLookup is not None:
writer.writeULong(perGlyphOffset)
if actionOffset is not None:
writer.writeULong(actionOffset)
writer.writeULong(ligComponentsOffset)
writer.writeULong(ligaturesOffset)
writer.writeData(glyphClassData)
writer.writeData(stateArrayData)
writer.writeData(entryTableData)
writer.writeData(perGlyphData)
if actionData is not None:
writer.writeData(actionData)
if ligComponentsData is not None:
writer.writeData(ligComponentsData)
if ligaturesData is not None:
writer.writeData(ligaturesData)
def _compileStates(self, font, states, glyphClassCount, actionIndex):
stateArrayWriter = OTTableWriter()
entries, entryIDs = [], {}
for state in states:
for glyphClass in range(glyphClassCount):
transition = state.Transitions[glyphClass]
entryWriter = OTTableWriter()
transition.compile(entryWriter, font,
actionIndex)
entryData = entryWriter.getAllData()
assert len(entryData) == transition.staticSize, ( \
"%s has staticSize %d, "
"but actually wrote %d bytes" % (
repr(transition),
transition.staticSize,
len(entryData)))
entryIndex = entryIDs.get(entryData)
if entryIndex is None:
entryIndex = len(entries)
entryIDs[entryData] = entryIndex
entries.append(entryData)
stateArrayWriter.writeUShort(entryIndex)
stateArrayData = pad(stateArrayWriter.getAllData(), 4)
entryTableData = pad(bytesjoin(entries), 4)
return stateArrayData, entryTableData
def _compilePerGlyphLookups(self, table, font):
if self.perGlyphLookup is None:
return b""
numLookups = self._countPerGlyphLookups(table)
assert len(table.PerGlyphLookups) == numLookups, (
"len(AATStateTable.PerGlyphLookups) is %d, "
"but the actions inside the table refer to %d" %
(len(table.PerGlyphLookups), numLookups))
writer = OTTableWriter()
for lookup in table.PerGlyphLookups:
lookupWriter = writer.getSubWriter()
lookupWriter.longOffset = True
self.perGlyphLookup.write(lookupWriter, font,
{}, lookup, None)
writer.writeSubTable(lookupWriter)
return writer.getAllData()
def _compileLigActions(self, table, font):
assert issubclass(self.tableClass, LigatureMorphAction)
actions = set()
for state in table.States:
for _glyphClass, trans in state.Transitions.items():
actions.add(trans.compileLigActions())
result, actionIndex = b"", {}
# Sort the compiled actions in decreasing order of
# length, so that the longer sequence come before the
# shorter ones. For each compiled action ABCD, its
# suffixes BCD, CD, and D do not be encoded separately
# (in case they occur); instead, we can just store an
# index that points into the middle of the longer
# sequence. Every compiled AAT ligature sequence is
# terminated with an end-of-sequence flag, which can
# only be set on the last element of the sequence.
# Therefore, it is sufficient to consider just the
# suffixes.
for a in sorted(actions, key=lambda x:(-len(x), x)):
if a not in actionIndex:
for i in range(0, len(a), 4):
suffix = a[i:]
suffixIndex = (len(result) + i) // 4
actionIndex.setdefault(
suffix, suffixIndex)
result += a
assert len(result) % self.tableClass.staticSize == 0
return (result, actionIndex)
def _compileLigComponents(self, table, font):
if not hasattr(table, "LigComponents"):
return None
writer = OTTableWriter()
for component in table.LigComponents:
writer.writeUShort(component)
return writer.getAllData()
def _compileLigatures(self, table, font):
if not hasattr(table, "Ligatures"):
return None
writer = OTTableWriter()
for glyphName in table.Ligatures:
writer.writeUShort(font.getGlyphID(glyphName))
return writer.getAllData()
def xmlWrite(self, xmlWriter, font, value, name, attrs):
xmlWriter.begintag(name, attrs)
xmlWriter.newline()
xmlWriter.comment("GlyphClassCount=%s" %value.GlyphClassCount)
xmlWriter.newline()
for g, klass in sorted(value.GlyphClasses.items()):
xmlWriter.simpletag("GlyphClass", glyph=g, value=klass)
xmlWriter.newline()
for stateIndex, state in enumerate(value.States):
xmlWriter.begintag("State", index=stateIndex)
xmlWriter.newline()
for glyphClass, trans in sorted(state.Transitions.items()):
trans.toXML(xmlWriter, font=font,
attrs={"onGlyphClass": glyphClass},
name="Transition")
xmlWriter.endtag("State")
xmlWriter.newline()
for i, lookup in enumerate(value.PerGlyphLookups):
xmlWriter.begintag("PerGlyphLookup", index=i)
xmlWriter.newline()
for glyph, val in sorted(lookup.items()):
xmlWriter.simpletag("Lookup", glyph=glyph,
value=val)
xmlWriter.newline()
xmlWriter.endtag("PerGlyphLookup")
xmlWriter.newline()
if hasattr(value, "LigComponents"):
xmlWriter.begintag("LigComponents")
xmlWriter.newline()
for i, val in enumerate(getattr(value, "LigComponents")):
xmlWriter.simpletag("LigComponent", index=i,
value=val)
xmlWriter.newline()
xmlWriter.endtag("LigComponents")
xmlWriter.newline()
self._xmlWriteLigatures(xmlWriter, font, value, name, attrs)
xmlWriter.endtag(name)
xmlWriter.newline()
def _xmlWriteLigatures(self, xmlWriter, font, value, name, attrs):
if not hasattr(value, "Ligatures"):
return
xmlWriter.begintag("Ligatures")
xmlWriter.newline()
for i, g in enumerate(getattr(value, "Ligatures")):
xmlWriter.simpletag("Ligature", index=i, glyph=g)
xmlWriter.newline()
xmlWriter.endtag("Ligatures")
xmlWriter.newline()
def xmlRead(self, attrs, content, font):
table = AATStateTable()
for eltName, eltAttrs, eltContent in filter(istuple, content):
if eltName == "GlyphClass":
glyph = eltAttrs["glyph"]
value = eltAttrs["value"]
table.GlyphClasses[glyph] = safeEval(value)
elif eltName == "State":
state = self._xmlReadState(eltAttrs, eltContent, font)
table.States.append(state)
elif eltName == "PerGlyphLookup":
lookup = self.perGlyphLookup.xmlRead(
eltAttrs, eltContent, font)
table.PerGlyphLookups.append(lookup)
elif eltName == "LigComponents":
table.LigComponents = \
self._xmlReadLigComponents(
eltAttrs, eltContent, font)
elif eltName == "Ligatures":
table.Ligatures = \
self._xmlReadLigatures(
eltAttrs, eltContent, font)
table.GlyphClassCount = max(table.GlyphClasses.values()) + 1
return table
def _xmlReadState(self, attrs, content, font):
state = AATState()
for eltName, eltAttrs, eltContent in filter(istuple, content):
if eltName == "Transition":
glyphClass = safeEval(eltAttrs["onGlyphClass"])
transition = self.tableClass()
transition.fromXML(eltName, eltAttrs,
eltContent, font)
state.Transitions[glyphClass] = transition
return state
def _xmlReadLigComponents(self, attrs, content, font):
ligComponents = []
for eltName, eltAttrs, _eltContent in filter(istuple, content):
if eltName == "LigComponent":
ligComponents.append(
safeEval(eltAttrs["value"]))
return ligComponents
def _xmlReadLigatures(self, attrs, content, font):
ligs = []
for eltName, eltAttrs, _eltContent in filter(istuple, content):
if eltName == "Ligature":
ligs.append(eltAttrs["glyph"])
return ligs
class CIDGlyphMap(BaseConverter):
def read(self, reader, font, tableDict):
numCIDs = reader.readUShort()
result = {}
for cid, glyphID in enumerate(reader.readUShortArray(numCIDs)):
if glyphID != 0xFFFF:
result[cid] = font.getGlyphName(glyphID)
return result
def write(self, writer, font, tableDict, value, repeatIndex=None):
items = {cid: font.getGlyphID(glyph)
for cid, glyph in value.items()}
count = max(items) + 1 if items else 0
writer.writeUShort(count)
for cid in range(count):
writer.writeUShort(items.get(cid, 0xFFFF))
def xmlRead(self, attrs, content, font):
result = {}
for eName, eAttrs, _eContent in filter(istuple, content):
if eName == "CID":
result[safeEval(eAttrs["cid"])] = \
eAttrs["glyph"].strip()
return result
def xmlWrite(self, xmlWriter, font, value, name, attrs):
xmlWriter.begintag(name, attrs)
xmlWriter.newline()
for cid, glyph in sorted(value.items()):
if glyph is not None and glyph != 0xFFFF:
xmlWriter.simpletag(
"CID", cid=cid, glyph=glyph)
xmlWriter.newline()
xmlWriter.endtag(name)
xmlWriter.newline()
class GlyphCIDMap(BaseConverter):
def read(self, reader, font, tableDict):
glyphOrder = font.getGlyphOrder()
count = reader.readUShort()
cids = reader.readUShortArray(count)
if count > len(glyphOrder):
log.warning("GlyphCIDMap has %d elements, "
"but the font has only %d glyphs; "
"ignoring the rest" %
(count, len(glyphOrder)))
result = {}
for glyphID in range(min(len(cids), len(glyphOrder))):
cid = cids[glyphID]
if cid != 0xFFFF:
result[glyphOrder[glyphID]] = cid
return result
def write(self, writer, font, tableDict, value, repeatIndex=None):
items = {font.getGlyphID(g): cid
for g, cid in value.items()
if cid is not None and cid != 0xFFFF}
count = max(items) + 1 if items else 0
writer.writeUShort(count)
for glyphID in range(count):
writer.writeUShort(items.get(glyphID, 0xFFFF))
def xmlRead(self, attrs, content, font):
result = {}
for eName, eAttrs, _eContent in filter(istuple, content):
if eName == "CID":
result[eAttrs["glyph"]] = \
safeEval(eAttrs["value"])
return result
def xmlWrite(self, xmlWriter, font, value, name, attrs):
xmlWriter.begintag(name, attrs)
xmlWriter.newline()
for glyph, cid in sorted(value.items()):
if cid is not None and cid != 0xFFFF:
xmlWriter.simpletag(
"CID", glyph=glyph, value=cid)
xmlWriter.newline()
xmlWriter.endtag(name)
xmlWriter.newline()
class DeltaValue(BaseConverter):
def read(self, reader, font, tableDict):
StartSize = tableDict["StartSize"]
EndSize = tableDict["EndSize"]
DeltaFormat = tableDict["DeltaFormat"]
assert DeltaFormat in (1, 2, 3), "illegal DeltaFormat"
nItems = EndSize - StartSize + 1
nBits = 1 << DeltaFormat
minusOffset = 1 << nBits
mask = (1 << nBits) - 1
signMask = 1 << (nBits - 1)
DeltaValue = []
tmp, shift = 0, 0
for i in range(nItems):
if shift == 0:
tmp, shift = reader.readUShort(), 16
shift = shift - nBits
value = (tmp >> shift) & mask
if value & signMask:
value = value - minusOffset
DeltaValue.append(value)
return DeltaValue
def write(self, writer, font, tableDict, value, repeatIndex=None):
StartSize = tableDict["StartSize"]
EndSize = tableDict["EndSize"]
DeltaFormat = tableDict["DeltaFormat"]
DeltaValue = value
assert DeltaFormat in (1, 2, 3), "illegal DeltaFormat"
nItems = EndSize - StartSize + 1
nBits = 1 << DeltaFormat
assert len(DeltaValue) == nItems
mask = (1 << nBits) - 1
tmp, shift = 0, 16
for value in DeltaValue:
shift = shift - nBits
tmp = tmp | ((value & mask) << shift)
if shift == 0:
writer.writeUShort(tmp)
tmp, shift = 0, 16
if shift != 16:
writer.writeUShort(tmp)
def xmlWrite(self, xmlWriter, font, value, name, attrs):
xmlWriter.simpletag(name, attrs + [("value", value)])
xmlWriter.newline()
def xmlRead(self, attrs, content, font):
return safeEval(attrs["value"])
class VarIdxMapValue(BaseConverter):
def read(self, reader, font, tableDict):
fmt = tableDict['EntryFormat']
nItems = tableDict['MappingCount']
innerBits = 1 + (fmt & 0x000F)
innerMask = (1<<innerBits) - 1
outerMask = 0xFFFFFFFF - innerMask
outerShift = 16 - innerBits
entrySize = 1 + ((fmt & 0x0030) >> 4)
read = {
1: reader.readUInt8,
2: reader.readUShort,
3: reader.readUInt24,
4: reader.readULong,
}[entrySize]
mapping = []
for i in range(nItems):
raw = read()
idx = ((raw & outerMask) << outerShift) | (raw & innerMask)
mapping.append(idx)
return mapping
def write(self, writer, font, tableDict, value, repeatIndex=None):
fmt = tableDict['EntryFormat']
mapping = value
writer['MappingCount'].setValue(len(mapping))
innerBits = 1 + (fmt & 0x000F)
innerMask = (1<<innerBits) - 1
outerShift = 16 - innerBits
entrySize = 1 + ((fmt & 0x0030) >> 4)
write = {
1: writer.writeUInt8,
2: writer.writeUShort,
3: writer.writeUInt24,
4: writer.writeULong,
}[entrySize]
for idx in mapping:
raw = ((idx & 0xFFFF0000) >> outerShift) | (idx & innerMask)
write(raw)
class VarDataValue(BaseConverter):
def read(self, reader, font, tableDict):
values = []
regionCount = tableDict["VarRegionCount"]
shortCount = tableDict["NumShorts"]
for i in range(min(regionCount, shortCount)):
values.append(reader.readShort())
for i in range(min(regionCount, shortCount), regionCount):
values.append(reader.readInt8())
for i in range(regionCount, shortCount):
reader.readInt8()
return values
def write(self, writer, font, tableDict, value, repeatIndex=None):
regionCount = tableDict["VarRegionCount"]
shortCount = tableDict["NumShorts"]
for i in range(min(regionCount, shortCount)):
writer.writeShort(value[i])
for i in range(min(regionCount, shortCount), regionCount):
writer.writeInt8(value[i])
for i in range(regionCount, shortCount):
writer.writeInt8(0)
def xmlWrite(self, xmlWriter, font, value, name, attrs):
xmlWriter.simpletag(name, attrs + [("value", value)])
xmlWriter.newline()
def xmlRead(self, attrs, content, font):
return safeEval(attrs["value"])
converterMapping = {
# type class
"int8": Int8,
"int16": Short,
"uint8": UInt8,
"uint8": UInt8,
"uint16": UShort,
"uint24": UInt24,
"uint32": ULong,
"char64": Char64,
"Flags32": Flags32,
"Version": Version,
"Tag": Tag,
"GlyphID": GlyphID,
"NameID": NameID,
"DeciPoints": DeciPoints,
"Fixed": Fixed,
"F2Dot14": F2Dot14,
"struct": Struct,
"Offset": Table,
"LOffset": LTable,
"ValueRecord": ValueRecord,
"DeltaValue": DeltaValue,
"VarIdxMapValue": VarIdxMapValue,
"VarDataValue": VarDataValue,
# AAT
"CIDGlyphMap": CIDGlyphMap,
"GlyphCIDMap": GlyphCIDMap,
"MortChain": StructWithLength,
"MortSubtable": StructWithLength,
"MorxChain": StructWithLength,
"MorxSubtable": MorxSubtableConverter,
# "Template" types
"AATLookup": lambda C: partial(AATLookup, tableClass=C),
"AATLookupWithDataOffset": lambda C: partial(AATLookupWithDataOffset, tableClass=C),
"STXHeader": lambda C: partial(STXHeader, tableClass=C),
"OffsetTo": lambda C: partial(Table, tableClass=C),
"LOffsetTo": lambda C: partial(LTable, tableClass=C),
}
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