def readTTCHeader(file):
file.seek(0)
data = file.read(ttcHeaderSize)
if len(data) != ttcHeaderSize:
raise TTLibError("Not a Font Collection (not enough data)")
self = SimpleNamespace()
sstruct.unpack(ttcHeaderFormat, data, self)
if self.TTCTag != "ttcf":
raise TTLibError("Not a Font Collection")
assert self.Version == 0x00010000 or self.Version == 0x00020000, "unrecognized TTC version 0x%08x" % self.Version
self.offsetTable = struct.unpack(">%dL" % self.numFonts, file.read(self.numFonts * 4))
if self.Version == 0x00020000:
pass # ignoring version 2.0 signatures
return self
def __init__(self, file, checkChecksums=0, fontNumber=-1):
self.file = file
self.checkChecksums = checkChecksums
self.flavor = None
self.flavorData = None
self.DirectoryEntry = SFNTDirectoryEntry
self.file.seek(0)
self.sfntVersion = self.file.read(4)
self.file.seek(0)
if self.sfntVersion == b"ttcf":
header = readTTCHeader(self.file)
numFonts = header.numFonts
if not 0 <= fontNumber < numFonts:
raise TTLibError("specify a font number between 0 and %d (inclusive)" % (numFonts - 1))
self.numFonts = numFonts
self.file.seek(header.offsetTable[fontNumber])
data = self.file.read(sfntDirectorySize)
if len(data) != sfntDirectorySize:
raise TTLibError("Not a Font Collection (not enough data)")
sstruct.unpack(sfntDirectoryFormat, data, self)
elif self.sfntVersion == b"wOFF":
self.flavor = "woff"
self.DirectoryEntry = WOFFDirectoryEntry
data = self.file.read(woffDirectorySize)
if len(data) != woffDirectorySize:
raise TTLibError("Not a WOFF font (not enough data)")
sstruct.unpack(woffDirectoryFormat, data, self)
else:
data = self.file.read(sfntDirectorySize)
if len(data) != sfntDirectorySize:
raise TTLibError("Not a TrueType or OpenType font (not enough data)")
sstruct.unpack(sfntDirectoryFormat, data, self)
self.sfntVersion = Tag(self.sfntVersion)
if self.sfntVersion not in ("\x00\x01\x00\x00", "OTTO", "true"):
raise TTLibError("Not a TrueType or OpenType font (bad sfntVersion)")
tables = {}
for i in range(self.numTables):
entry = self.DirectoryEntry()
entry.fromFile(self.file)
tag = Tag(entry.tag)
tables[tag] = entry
self.tables = OrderedDict(sorted(tables.items(), key=lambda i: i[1].offset))
# Load flavor data if any
if self.flavor == "woff":
self.flavorData = WOFFFlavorData(self)
def getGlyphSet(self, preferCFF=True):
"""Return a generic GlyphSet, which is a dict-like object
mapping glyph names to glyph objects. The returned glyph objects
have a .draw() method that supports the Pen protocol, and will
have an attribute named 'width'.
If the font is CFF-based, the outlines will be taken from the 'CFF ' or
'CFF2' tables. Otherwise the outlines will be taken from the 'glyf' table.
If the font contains both a 'CFF '/'CFF2' and a 'glyf' table, you can use
the 'preferCFF' argument to specify which one should be taken. If the
font contains both a 'CFF ' and a 'CFF2' table, the latter is taken.
"""
glyphs = None
if (preferCFF and any(tb in self for tb in ["CFF ", "CFF2"])
or ("glyf" not in self and any(tb in self
for tb in ["CFF ", "CFF2"]))):
table_tag = "CFF2" if "CFF2" in self else "CFF "
glyphs = _TTGlyphSet(
self,
list(self[table_tag].cff.values())[0].CharStrings, _TTGlyphCFF)
if glyphs is None and "glyf" in self:
glyphs = _TTGlyphSet(self, self["glyf"], _TTGlyphGlyf)
if glyphs is None:
raise TTLibError("Font contains no outlines")
return glyphs
def __setitem__(self, tag, data):
"""Write raw table data to disk."""
if tag in self.tables:
raise TTLibError("cannot rewrite '%s' table" % tag)
entry = self.DirectoryEntry()
entry.tag = tag
entry.offset = self.nextTableOffset
if tag == 'head':
entry.checkSum = calcChecksum(data[:8] + b'\0\0\0\0' + data[12:])
self.headTable = data
entry.uncompressed = True
else:
entry.checkSum = calcChecksum(data)
entry.saveData(self.file, data)
if self.flavor == "woff":
entry.origOffset = self.origNextTableOffset
self.origNextTableOffset += (entry.origLength + 3) & ~3
self.nextTableOffset = self.nextTableOffset + ((entry.length + 3) & ~3)
# Add NUL bytes to pad the table data to a 4-byte boundary.
# Don't depend on f.seek() as we need to add the padding even if no
# subsequent write follows (seek is lazy), ie. after the final table
# in the font.
self.file.write(b'\0' * (self.nextTableOffset - self.file.tell()))
assert self.nextTableOffset == self.file.tell()
self.setEntry(tag, entry)
def fromXML(self, name, attrs, content, ttFont):
if name == "hexdata":
self.data[attrs["tag"]] = readHex(content)
elif name == "text" and attrs["tag"] in ["dlng", "slng"]:
self.data[attrs["tag"]] = strjoin(content).strip()
else:
raise TTLibError("can't handle '%s' element" % name)
def decompile(self, data, offset):
# initial offset is from the start of trak table to the current TrackData
trackDataHeader = data[offset:offset + TRACK_DATA_FORMAT_SIZE]
if len(trackDataHeader) != TRACK_DATA_FORMAT_SIZE:
raise TTLibError('not enough data to decompile TrackData header')
sstruct.unpack(TRACK_DATA_FORMAT, trackDataHeader, self)
offset += TRACK_DATA_FORMAT_SIZE
nSizes = self.nSizes
sizeTableOffset = self.sizeTableOffset
sizeTable = []
for i in range(nSizes):
sizeValueData = data[sizeTableOffset:sizeTableOffset +
SIZE_VALUE_FORMAT_SIZE]
if len(sizeValueData) < SIZE_VALUE_FORMAT_SIZE:
raise TTLibError(
'not enough data to decompile TrackData size subtable')
sizeValue, = struct.unpack(SIZE_VALUE_FORMAT, sizeValueData)
sizeTable.append(fi2fl(sizeValue, 16))
sizeTableOffset += SIZE_VALUE_FORMAT_SIZE
for i in range(self.nTracks):
entry = TrackTableEntry()
entryData = data[offset:offset + TRACK_TABLE_ENTRY_FORMAT_SIZE]
if len(entryData) < TRACK_TABLE_ENTRY_FORMAT_SIZE:
raise TTLibError(
'not enough data to decompile TrackTableEntry record')
sstruct.unpack(TRACK_TABLE_ENTRY_FORMAT, entryData, entry)
perSizeOffset = entry.offset
for j in range(nSizes):
size = sizeTable[j]
perSizeValueData = data[perSizeOffset:perSizeOffset +
PER_SIZE_VALUE_FORMAT_SIZE]
if len(perSizeValueData) < PER_SIZE_VALUE_FORMAT_SIZE:
raise TTLibError(
'not enough data to decompile per-size track values')
perSizeValue, = struct.unpack(PER_SIZE_VALUE_FORMAT,
perSizeValueData)
entry[size] = perSizeValue
perSizeOffset += PER_SIZE_VALUE_FORMAT_SIZE
self[entry.track] = entry
offset += TRACK_TABLE_ENTRY_FORMAT_SIZE
def sizes(self):
if not self:
return frozenset()
tracks = list(self.tracks())
sizes = self[tracks.pop(0)].sizes()
for track in tracks:
entrySizes = self[track].sizes()
if sizes != entrySizes:
raise TTLibError(
"'trak' table entries must specify the same sizes: "
"%s != %s" % (sorted(sizes), sorted(entrySizes)))
return frozenset(sizes)
def decompile(self, data, ttFont):
axisTags = [axis.axisTag for axis in ttFont["fvar"].axes]
header = {}
headerSize = sstruct.calcsize(AVAR_HEADER_FORMAT)
header = sstruct.unpack(AVAR_HEADER_FORMAT, data[0:headerSize])
majorVersion = header["majorVersion"]
if majorVersion != 1:
raise TTLibError("unsupported 'avar' version %d" % majorVersion)
pos = headerSize
for axis in axisTags:
segments = self.segments[axis] = {}
numPairs = struct.unpack(">H", data[pos:pos+2])[0]
pos = pos + 2
for _ in range(numPairs):
fromValue, toValue = struct.unpack(">hh", data[pos:pos+4])
segments[fi2fl(fromValue, 14)] = fi2fl(toValue, 14)
pos = pos + 4
def decompile(self, data, ttFont):
headerSize = sstruct.calcsize(META_HEADER_FORMAT)
header = sstruct.unpack(META_HEADER_FORMAT, data[0 : headerSize])
if header["version"] != 1:
raise TTLibError("unsupported 'meta' version %d" %
header["version"])
dataMapSize = sstruct.calcsize(DATA_MAP_FORMAT)
for i in range(header["numDataMaps"]):
dataMapOffset = headerSize + i * dataMapSize
dataMap = sstruct.unpack(
DATA_MAP_FORMAT,
data[dataMapOffset : dataMapOffset + dataMapSize])
tag = dataMap["tag"]
offset = dataMap["dataOffset"]
self.data[tag] = data[offset : offset + dataMap["dataLength"]]
if tag in ["dlng", "slng"]:
self.data[tag] = self.data[tag].decode("utf-8")
def decompile(self, data, ttFont):
if not self.apple:
version, length, subtableFormat, coverage = struct.unpack(
">HHBB", data[:6])
if version != 0:
from fontemon_blender_addon.fontTools.ttLib import TTLibError
raise TTLibError("unsupported kern subtable version: %d" %
version)
tupleIndex = None
# Should we also assert length == len(data)?
data = data[6:]
else:
length, coverage, subtableFormat, tupleIndex = struct.unpack(
">LBBH", data[:8])
data = data[8:]
assert self.format == subtableFormat, "unsupported format"
self.coverage = coverage
self.tupleIndex = tupleIndex
self.kernTable = kernTable = {}
nPairs, searchRange, entrySelector, rangeShift = struct.unpack(
">HHHH", data[:8])
data = data[8:]
datas = array.array("H", data[:6 * nPairs])
if sys.byteorder != "big": datas.byteswap()
it = iter(datas)
glyphOrder = ttFont.getGlyphOrder()
for k in range(nPairs):
left, right, value = next(it), next(it), next(it)
if value >= 32768:
value -= 65536
try:
kernTable[(glyphOrder[left], glyphOrder[right])] = value
except IndexError:
# Slower, but will not throw an IndexError on an invalid
# glyph id.
kernTable[(ttFont.getGlyphName(left),
ttFont.getGlyphName(right))] = value
if len(data) > 6 * nPairs + 4: # Ignore up to 4 bytes excess
log.warning("excess data in 'kern' subtable: %d bytes",
len(data) - 6 * nPairs)
def decompile(self, data, ttFont):
header = {}
headerSize = sstruct.calcsize(FVAR_HEADER_FORMAT)
header = sstruct.unpack(FVAR_HEADER_FORMAT, data[0:headerSize])
if header["version"] != 0x00010000:
raise TTLibError("unsupported 'fvar' version %04x" %
header["version"])
pos = header["offsetToData"]
axisSize = header["axisSize"]
for _ in range(header["axisCount"]):
axis = Axis()
axis.decompile(data[pos:pos + axisSize])
self.axes.append(axis)
pos += axisSize
instanceSize = header["instanceSize"]
axisTags = [axis.axisTag for axis in self.axes]
for _ in range(header["instanceCount"]):
instance = NamedInstance()
instance.decompile(data[pos:pos + instanceSize], axisTags)
self.instances.append(instance)
pos += instanceSize
def save(self, file, reorderTables=True):
"""Save the font to disk. Similarly to the constructor,
the 'file' argument can be either a pathname or a writable
file object.
"""
if not hasattr(file, "write"):
if self.lazy and self.reader.file.name == file:
raise TTLibError(
"Can't overwrite TTFont when 'lazy' attribute is True")
closeStream = True
file = open(file, "wb")
else:
# assume "file" is a writable file object
closeStream = False
tmp = BytesIO()
writer_reordersTables = self._save(tmp)
if (reorderTables is None or writer_reordersTables
or (reorderTables is False and self.reader is None)):
# don't reorder tables and save as is
file.write(tmp.getvalue())
tmp.close()
else:
if reorderTables is False:
# sort tables using the original font's order
tableOrder = list(self.reader.keys())
else:
# use the recommended order from the OpenType specification
tableOrder = None
tmp.flush()
tmp2 = BytesIO()
reorderFontTables(tmp, tmp2, tableOrder)
file.write(tmp2.getvalue())
tmp.close()
tmp2.close()
if closeStream:
file.close()
def close(self):
"""All tables must have been written to disk. Now write the
directory.
"""
tables = sorted(self.tables.items())
if len(tables) != self.numTables:
raise TTLibError("wrong number of tables; expected %d, found %d" % (self.numTables, len(tables)))
if self.flavor == "woff":
self.signature = b"wOFF"
self.reserved = 0
self.totalSfntSize = 12
self.totalSfntSize += 16 * len(tables)
for tag, entry in tables:
self.totalSfntSize += (entry.origLength + 3) & ~3
data = self.flavorData if self.flavorData else WOFFFlavorData()
if data.majorVersion is not None and data.minorVersion is not None:
self.majorVersion = data.majorVersion
self.minorVersion = data.minorVersion
else:
if hasattr(self, 'headTable'):
self.majorVersion, self.minorVersion = struct.unpack(">HH", self.headTable[4:8])
else:
self.majorVersion = self.minorVersion = 0
if data.metaData:
self.metaOrigLength = len(data.metaData)
self.file.seek(0,2)
self.metaOffset = self.file.tell()
compressedMetaData = compress(data.metaData)
self.metaLength = len(compressedMetaData)
self.file.write(compressedMetaData)
else:
self.metaOffset = self.metaLength = self.metaOrigLength = 0
if data.privData:
self.file.seek(0,2)
off = self.file.tell()
paddedOff = (off + 3) & ~3
self.file.write('\0' * (paddedOff - off))
self.privOffset = self.file.tell()
self.privLength = len(data.privData)
self.file.write(data.privData)
else:
self.privOffset = self.privLength = 0
self.file.seek(0,2)
self.length = self.file.tell()
else:
assert not self.flavor, "Unknown flavor '%s'" % self.flavor
pass
directory = sstruct.pack(self.directoryFormat, self)
self.file.seek(self.directoryOffset + self.directorySize)
seenHead = 0
for tag, entry in tables:
if tag == "head":
seenHead = 1
directory = directory + entry.toString()
if seenHead:
self.writeMasterChecksum(directory)
self.file.seek(self.directoryOffset)
self.file.write(directory)
def setEntry(self, tag, entry):
if tag in self.tables:
raise TTLibError("cannot rewrite '%s' table" % tag)
self.tables[tag] = entry