blob: 96d461a38bd6698cc23ba31ae149b21c6a60fb4a [file] [log] [blame]
from fontTools.misc.py23 import *
from fontTools.misc.fixedTools import (
fixedToFloat as fi2fl,
floatToFixed as fl2fi,
floatToFixedToStr as fl2str,
strToFixedToFloat as str2fl,
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,
InsertionMorphAction, MorxSubtable, VariableFloat,
VariableInt, ExtendMode as _ExtendMode,
CompositeMode as _CompositeMode)
from itertools import zip_longest
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)
conv = converterClass(name, repeat, aux)
if conv.tableClass:
# A "template" such as OffsetTo(AType) knowss the table class already
tableClass = conv.tableClass
elif tp in ('MortChain', 'MortSubtable', 'MorxChain'):
tableClass = tableNamespace.get(tp)
else:
tableClass = tableNamespace.get(tableName)
if not conv.tableClass:
conv.tableClass = tableClass
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",
"AxisCount",
"BaseGlyphRecordCount",
"LayerRecordCount",
]
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):
@staticmethod
def toString(value):
return value
@staticmethod
def fromString(value):
return value
def xmlWrite(self, xmlWriter, font, value, name, attrs):
xmlWriter.simpletag(name, attrs + [("value", self.toString(value))])
xmlWriter.newline()
def xmlRead(self, attrs, content, font):
return self.fromString(attrs["value"])
class IntValue(SimpleValue):
@staticmethod
def fromString(value):
return int(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):
@staticmethod
def toString(value):
return "0x%08X" % value
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
typecode = "H"
def readArray(self, reader, font, tableDict, count):
glyphOrder = font.getGlyphOrder()
gids = reader.readArray(self.typecode, self.staticSize, 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.readValue(self.typecode, self.staticSize))
def write(self, writer, font, tableDict, value, repeatIndex=None):
writer.writeValue(self.typecode, font.getGlyphID(value))
class GlyphID32(GlyphID):
staticSize = 4
typecode = "L"
class NameID(UShort):
def xmlWrite(self, xmlWriter, font, value, name, attrs):
xmlWriter.simpletag(name, attrs + [("value", value)])
if font and value:
nameTable = font.get("name")
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):
@staticmethod
def fromString(value):
return float(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))
@staticmethod
def fromString(value):
return str2fl(value, 16)
@staticmethod
def toString(value):
return fl2str(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))
@staticmethod
def fromString(value):
return str2fl(value, 14)
@staticmethod
def toString(value):
return fl2str(value, 14)
class Version(SimpleValue):
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)
@staticmethod
def fromString(value):
return ve2fi(value)
@staticmethod
def toString(value):
return "0x%08x" % value
@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):
staticSize = 2
def readOffset(self, reader):
return reader.readUShort()
def writeNullOffset(self, writer):
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(offsetSize=self.staticSize)
subWriter.name = self.name
if repeatIndex is not None:
subWriter.repeatIndex = repeatIndex
writer.writeSubTable(subWriter)
value.compile(subWriter, font)
class LTable(Table):
staticSize = 4
def readOffset(self, reader):
return reader.readULong()
def writeNullOffset(self, writer):
writer.writeULong(0)
# Table pointed to by a 24-bit, 3-byte long offset
class Table24(Table):
staticSize = 3
def readOffset(self, reader):
return reader.readUInt24()
def writeNullOffset(self, writer):
writer.writeUInt24(0)
# 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(offsetSize=4)
lookup = AATLookup('DataOffsets', None, None, UShort)
lookup.write(lookupWriter, font, tableDict, offsetByGlyph, None)
dataWriter = writer.getSubWriter(offsetSize=4)
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)
elif issubclass(self.tableClass, InsertionMorphAction):
actionReader = reader.getSubReader(0)
actionReader.seek(pos + reader.readULong())
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(), 2)
glyphClassCount = max(value.GlyphClasses.values()) + 1
glyphClassTableOffset = 16 # size of STXHeader
if self.perGlyphLookup is not None:
glyphClassTableOffset += 4
glyphClassTableOffset += self.tableClass.actionHeaderSize
actionData, actionIndex = \
self.tableClass.compileActions(font, value.States)
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)
if actionData is not None:
actionOffset = entryTableOffset + len(entryTableData)
else:
actionOffset = None
ligaturesOffset, ligComponentsOffset = None, None
ligComponentsData = self._compileLigComponents(value, font)
ligaturesData = self._compileLigatures(value, font)
if ligComponentsData is not None:
assert len(perGlyphData) == 0
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)
if ligComponentsOffset is not None:
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(offsetSize=4)
self.perGlyphLookup.write(lookupWriter, font,
{}, lookup, None)
writer.writeSubTable(lookupWriter)
return writer.getAllData()
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"])
class LookupFlag(UShort):
def xmlWrite(self, xmlWriter, font, value, name, attrs):
xmlWriter.simpletag(name, attrs + [("value", value)])
flags = []
if value & 0x01: flags.append("rightToLeft")
if value & 0x02: flags.append("ignoreBaseGlyphs")
if value & 0x04: flags.append("ignoreLigatures")
if value & 0x08: flags.append("ignoreMarks")
if value & 0x10: flags.append("useMarkFilteringSet")
if value & 0xff00: flags.append("markAttachmentType[%i]" % (value >> 8))
if flags:
xmlWriter.comment(" ".join(flags))
xmlWriter.newline()
def _issubclass_namedtuple(x):
return (
issubclass(x, tuple)
and getattr(x, "_fields", None) is not None
)
class _NamedTupleConverter(BaseConverter):
# subclasses must override this
tupleClass = NotImplemented
# List[SimpleValue]
converterClasses = NotImplemented
def __init__(self, name, repeat, aux, tableClass=None):
# we expect all converters to be subclasses of SimpleValue
assert all(issubclass(klass, SimpleValue) for klass in self.converterClasses)
assert _issubclass_namedtuple(self.tupleClass), repr(self.tupleClass)
assert len(self.tupleClass._fields) == len(self.converterClasses)
assert tableClass is None # tableClass is unused by SimplValues
BaseConverter.__init__(self, name, repeat, aux)
self.converters = [
klass(name=name, repeat=None, aux=None)
for name, klass in zip(self.tupleClass._fields, self.converterClasses)
]
self.convertersByName = {conv.name: conv for conv in self.converters}
# returned by getRecordSize method
self.staticSize = sum(c.staticSize for c in self.converters)
def read(self, reader, font, tableDict):
kwargs = {
conv.name: conv.read(reader, font, tableDict)
for conv in self.converters
}
return self.tupleClass(**kwargs)
def write(self, writer, font, tableDict, value, repeatIndex=None):
for conv in self.converters:
v = getattr(value, conv.name)
# repeatIndex is unused for SimpleValues
conv.write(writer, font, tableDict, v, repeatIndex=None)
def xmlWrite(self, xmlWriter, font, value, name, attrs):
assert value is not None
defaults = value.__new__.__defaults__ or ()
assert len(self.converters) >= len(defaults)
values = {}
required = object()
for conv, default in zip_longest(
reversed(self.converters),
reversed(defaults),
fillvalue=required,
):
v = getattr(value, conv.name)
if default is required or v != default:
values[conv.name] = conv.toString(v)
if attrs is None:
attrs = []
attrs.extend(
(conv.name, values[conv.name])
for conv in self.converters
if conv.name in values
)
xmlWriter.simpletag(name, attrs)
xmlWriter.newline()
def xmlRead(self, attrs, content, font):
converters = self.convertersByName
kwargs = {
k: converters[k].fromString(v)
for k, v in attrs.items()
}
return self.tupleClass(**kwargs)
class VarFixed(_NamedTupleConverter):
tupleClass = VariableFloat
converterClasses = [Fixed, ULong]
class VarF2Dot14(_NamedTupleConverter):
tupleClass = VariableFloat
converterClasses = [F2Dot14, ULong]
class VarInt16(_NamedTupleConverter):
tupleClass = VariableInt
converterClasses = [Short, ULong]
class VarUInt16(_NamedTupleConverter):
tupleClass = VariableInt
converterClasses = [UShort, ULong]
class _UInt8Enum(UInt8):
enumClass = NotImplemented
def read(self, reader, font, tableDict):
return self.enumClass(super().read(reader, font, tableDict))
@classmethod
def fromString(cls, value):
return getattr(cls.enumClass, value.upper())
@classmethod
def toString(cls, value):
return cls.enumClass(value).name.lower()
class ExtendMode(_UInt8Enum):
enumClass = _ExtendMode
class CompositeMode(_UInt8Enum):
enumClass = _CompositeMode
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,
"GlyphID32": GlyphID32,
"NameID": NameID,
"DeciPoints": DeciPoints,
"Fixed": Fixed,
"F2Dot14": F2Dot14,
"struct": Struct,
"Offset": Table,
"LOffset": LTable,
"Offset24": Table24,
"ValueRecord": ValueRecord,
"DeltaValue": DeltaValue,
"VarIdxMapValue": VarIdxMapValue,
"VarDataValue": VarDataValue,
"LookupFlag": LookupFlag,
"ExtendMode": ExtendMode,
"CompositeMode": CompositeMode,
# 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),
"LOffset24To": lambda C: partial(Table24, tableClass=C),
# Variable types
"VarFixed": VarFixed,
"VarF2Dot14": VarF2Dot14,
"VarInt16": VarInt16,
"VarUInt16": VarUInt16,
}