"""fontTools.ttLib -- a package for dealing with TrueType fonts.
This package offers translators to convert TrueType fonts to Python
objects and vice versa, and additionally from Python to TTX (an XML-based
text format) and vice versa.
Example interactive session:
Python 1.5.2c1 (#43, Mar 9 1999, 13:06:43) [CW PPC w/GUSI w/MSL]
Copyright 1991-1995 Stichting Mathematisch Centrum, Amsterdam
>>> from fontTools import ttLib
>>> tt = ttLib.TTFont("afont.ttf")
>>> tt['maxp'].numGlyphs
242
>>> tt['OS/2'].achVendID
'B&H\000'
>>> tt['head'].unitsPerEm
2048
>>> tt.saveXML("afont.ttx")
Dumping 'LTSH' table...
Dumping 'OS/2' table...
Dumping 'VDMX' table...
Dumping 'cmap' table...
Dumping 'cvt ' table...
Dumping 'fpgm' table...
Dumping 'glyf' table...
Dumping 'hdmx' table...
Dumping 'head' table...
Dumping 'hhea' table...
Dumping 'hmtx' table...
Dumping 'loca' table...
Dumping 'maxp' table...
Dumping 'name' table...
Dumping 'post' table...
Dumping 'prep' table...
>>> tt2 = ttLib.TTFont()
>>> tt2.importXML("afont.ttx")
>>> tt2['maxp'].numGlyphs
242
>>>
"""
#
# $Id: __init__.py,v 1.51 2009-02-22 08:55:00 pabs3 Exp $
#
import sys
import os
import string
haveMacSupport = 0
if sys.platform == "mac":
haveMacSupport = 1
elif sys.platform == "darwin" and sys.version_info[:3] != (2, 2, 0):
# Python 2.2's Mac support is broken, so don't enable it there.
haveMacSupport = 1
class TTLibError(Exception): pass
class TTFont:
"""The main font object. It manages file input and output, and offers
a convenient way of accessing tables.
Tables will be only decompiled when neccesary, ie. when they're actually
accessed. This means that simple operations can be extremely fast.
"""
def __init__(self, file=None, res_name_or_index=None,
sfntVersion="\000\001\000\000", checkChecksums=0,
verbose=0, recalcBBoxes=1, allowVID=0, ignoreDecompileErrors=False,
fontNumber=-1):
"""The constructor can be called with a few different arguments.
When reading a font from disk, 'file' should be either a pathname
pointing to a file, or a readable file object.
It we're running on a Macintosh, 'res_name_or_index' maybe an sfnt
resource name or an sfnt resource index number or zero. The latter
case will cause TTLib to autodetect whether the file is a flat file
or a suitcase. (If it's a suitcase, only the first 'sfnt' resource
will be read!)
The 'checkChecksums' argument is used to specify how sfnt
checksums are treated upon reading a file from disk:
0: don't check (default)
1: check, print warnings if a wrong checksum is found
2: check, raise an exception if a wrong checksum is found.
The TTFont constructor can also be called without a 'file'
argument: this is the way to create a new empty font.
In this case you can optionally supply the 'sfntVersion' argument.
If the recalcBBoxes argument is false, a number of things will *not*
be recalculated upon save/compile:
1) glyph bounding boxes
2) maxp font bounding box
3) hhea min/max values
(1) is needed for certain kinds of CJK fonts (ask Werner Lemberg ;-).
Additionally, upon importing an TTX file, this option cause glyphs
to be compiled right away. This should reduce memory consumption
greatly, and therefore should have some impact on the time needed
to parse/compile large fonts.
If the allowVID argument is set to true, then virtual GID's are
supported. Asking for a glyph ID with a glyph name or GID that is not in
the font will return a virtual GID. This is valid for GSUB and cmap
tables. For SING glyphlets, the cmap table is used to specify Unicode
values for virtual GI's used in GSUB/GPOS rules. If the gid Nis requested
and does not exist in the font, or the glyphname has the form glyphN
and does not exist in the font, then N is used as the virtual GID.
Else, the first virtual GID is assigned as 0x1000 -1; for subsequent new
virtual GIDs, the next is one less than the previous.
If ignoreDecompileErrors is set to True, exceptions raised in
individual tables during decompilation will be ignored, falling
back to the DefaultTable implementation, which simply keeps the
binary data.
"""
import sfnt
self.verbose = verbose
self.recalcBBoxes = recalcBBoxes
self.tables = {}
self.reader = None
# Permit the user to reference glyphs that are not int the font.
self.last_vid = 0xFFFE # Can't make it be 0xFFFF, as the world is full unsigned short integer counters that get incremented after the last seen GID value.
self.reverseVIDDict = {}
self.VIDDict = {}
self.allowVID = allowVID
self.ignoreDecompileErrors = ignoreDecompileErrors
if not file:
self.sfntVersion = sfntVersion
return
if not hasattr(file, "read"):
# assume file is a string
if haveMacSupport and res_name_or_index is not None:
# on the mac, we deal with sfnt resources as well as flat files
import macUtils
if res_name_or_index == 0:
if macUtils.getSFNTResIndices(file):
# get the first available sfnt font.
file = macUtils.SFNTResourceReader(file, 1)
else:
file = open(file, "rb")
else:
file = macUtils.SFNTResourceReader(file, res_name_or_index)
else:
file = open(file, "rb")
else:
pass # assume "file" is a readable file object
self.reader = sfnt.SFNTReader(file, checkChecksums, fontNumber=fontNumber)
self.sfntVersion = self.reader.sfntVersion
def close(self):
"""If we still have a reader object, close it."""
if self.reader is not None:
self.reader.close()
def save(self, file, makeSuitcase=0, reorderTables=1):
"""Save the font to disk. Similarly to the constructor,
the 'file' argument can be either a pathname or a writable
file object.
On the Mac, if makeSuitcase is true, a suitcase (resource fork)
file will we made instead of a flat .ttf file.
"""
from fontTools.ttLib import sfnt
if not hasattr(file, "write"):
closeStream = 1
if os.name == "mac" and makeSuitcase:
import macUtils
file = macUtils.SFNTResourceWriter(file, self)
else:
file = open(file, "wb")
if os.name == "mac":
import macfs
fss = macfs.FSSpec(file.name)
fss.SetCreatorType('mdos', 'BINA')
else:
# assume "file" is a writable file object
closeStream = 0
tags = self.keys()
if "GlyphOrder" in tags:
tags.remove("GlyphOrder")
numTables = len(tags)
if reorderTables:
import tempfile
tmp = tempfile.TemporaryFile(prefix="ttx-fonttools")
else:
tmp = file
writer = sfnt.SFNTWriter(tmp, numTables, self.sfntVersion)
done = []
for tag in tags:
self._writeTable(tag, writer, done)
writer.close()
if reorderTables:
tmp.flush()
tmp.seek(0)
reorderFontTables(tmp, file)
tmp.close()
if closeStream:
file.close()
def saveXML(self, fileOrPath, progress=None,
tables=None, skipTables=None, splitTables=0, disassembleInstructions=1):
"""Export the font as TTX (an XML-based text file), or as a series of text
files when splitTables is true. In the latter case, the 'fileOrPath'
argument should be a path to a directory.
The 'tables' argument must either be false (dump all tables) or a
list of tables to dump. The 'skipTables' argument may be a list of tables
to skip, but only when the 'tables' argument is false.
"""
from fontTools import version
import xmlWriter
self.disassembleInstructions = disassembleInstructions
if not tables:
tables = self.keys()
if "GlyphOrder" not in tables:
tables = ["GlyphOrder"] + tables
if skipTables:
for tag in skipTables:
if tag in tables:
tables.remove(tag)
numTables = len(tables)
if progress:
progress.set(0, numTables)
idlefunc = getattr(progress, "idle", None)
else:
idlefunc = None
writer = xmlWriter.XMLWriter(fileOrPath, idlefunc=idlefunc)
writer.begintag("ttFont", sfntVersion=`self.sfntVersion`[1:-1],
ttLibVersion=version)
writer.newline()
if not splitTables:
writer.newline()
else:
# 'fileOrPath' must now be a path
path, ext = os.path.splitext(fileOrPath)
fileNameTemplate = path + ".%s" + ext
for i in range(numTables):
if progress:
progress.set(i)
tag = tables[i]
if splitTables:
tablePath = fileNameTemplate % tagToIdentifier(tag)
tableWriter = xmlWriter.XMLWriter(tablePath, idlefunc=idlefunc)
tableWriter.begintag("ttFont", ttLibVersion=version)
tableWriter.newline()
tableWriter.newline()
writer.simpletag(tagToXML(tag), src=os.path.basename(tablePath))
writer.newline()
else:
tableWriter = writer
self._tableToXML(tableWriter, tag, progress)
if splitTables:
tableWriter.endtag("ttFont")
tableWriter.newline()
tableWriter.close()
if progress:
progress.set((i + 1))
writer.endtag("ttFont")
writer.newline()
writer.close()
if self.verbose:
debugmsg("Done dumping TTX")
def _tableToXML(self, writer, tag, progress):
if self.has_key(tag):
table = self[tag]
report = "Dumping '%s' table..." % tag
else:
report = "No '%s' table found." % tag
if progress:
progress.setLabel(report)
elif self.verbose:
debugmsg(report)
else:
print report
if not self.has_key(tag):
return
xmlTag = tagToXML(tag)
if hasattr(table, "ERROR"):
writer.begintag(xmlTag, ERROR="decompilation error")
else:
writer.begintag(xmlTag)
writer.newline()
if tag in ("glyf", "CFF "):
table.toXML(writer, self, progress)
else:
table.toXML(writer, self)
writer.endtag(xmlTag)
writer.newline()
writer.newline()
def importXML(self, file, progress=None):
"""Import a TTX file (an XML-based text format), so as to recreate
a font object.
"""
if self.has_key("maxp") and self.has_key("post"):
# Make sure the glyph order is loaded, as it otherwise gets
# lost if the XML doesn't contain the glyph order, yet does
# contain the table which was originally used to extract the
# glyph names from (ie. 'post', 'cmap' or 'CFF ').
self.getGlyphOrder()
import xmlImport
xmlImport.importXML(self, file, progress)
def isLoaded(self, tag):
"""Return true if the table identified by 'tag' has been
decompiled and loaded into memory."""
return self.tables.has_key(tag)
def has_key(self, tag):
if self.isLoaded(tag):
return 1
elif self.reader and self.reader.has_key(tag):
return 1
elif tag == "GlyphOrder":
return 1
else:
return 0
__contains__ = has_key
def keys(self):
keys = self.tables.keys()
if self.reader:
for key in self.reader.keys():
if key not in keys:
keys.append(key)
if "GlyphOrder" in keys:
keys.remove("GlyphOrder")
keys = sortedTagList(keys)
return ["GlyphOrder"] + keys
def __len__(self):
return len(self.keys())
def __getitem__(self, tag):
try:
return self.tables[tag]
except KeyError:
if tag == "GlyphOrder":
table = GlyphOrder(tag)
self.tables[tag] = table
return table
if self.reader is not None:
import traceback
if self.verbose:
debugmsg("Reading '%s' table from disk" % tag)
data = self.reader[tag]
tableClass = getTableClass(tag)
table = tableClass(tag)
self.tables[tag] = table
if self.verbose:
debugmsg("Decompiling '%s' table" % tag)
try:
table.decompile(data, self)
except:
if not self.ignoreDecompileErrors:
raise
# fall back to DefaultTable, retaining the binary table data
print "An exception occurred during the decompilation of the '%s' table" % tag
from tables.DefaultTable import DefaultTable
import StringIO
file = StringIO.StringIO()
traceback.print_exc(file=file)
table = DefaultTable(tag)
table.ERROR = file.getvalue()
self.tables[tag] = table
table.decompile(data, self)
return table
else:
raise KeyError, "'%s' table not found" % tag
def __setitem__(self, tag, table):
self.tables[tag] = table
def __delitem__(self, tag):
if not self.has_key(tag):
raise KeyError, "'%s' table not found" % tag
if self.tables.has_key(tag):
del self.tables[tag]
if self.reader and self.reader.has_key(tag):
del self.reader[tag]
def setGlyphOrder(self, glyphOrder):
self.glyphOrder = glyphOrder
def getGlyphOrder(self):
try:
return self.glyphOrder
except AttributeError:
pass
if self.has_key('CFF '):
cff = self['CFF ']
self.glyphOrder = cff.getGlyphOrder()
elif self.has_key('post'):
# TrueType font
glyphOrder = self['post'].getGlyphOrder()
if glyphOrder is None:
#
# No names found in the 'post' table.
# Try to create glyph names from the unicode cmap (if available)
# in combination with the Adobe Glyph List (AGL).
#
self._getGlyphNamesFromCmap()
else:
self.glyphOrder = glyphOrder
else:
self._getGlyphNamesFromCmap()
return self.glyphOrder
def _getGlyphNamesFromCmap(self):
#
# This is rather convoluted, but then again, it's an interesting problem:
# - we need to use the unicode values found in the cmap table to
# build glyph names (eg. because there is only a minimal post table,
# or none at all).
# - but the cmap parser also needs glyph names to work with...
# So here's what we do:
# - make up glyph names based on glyphID
# - load a temporary cmap table based on those names
# - extract the unicode values, build the "real" glyph names
# - unload the temporary cmap table
#
if self.isLoaded("cmap"):
# Bootstrapping: we're getting called by the cmap parser
# itself. This means self.tables['cmap'] contains a partially
# loaded cmap, making it impossible to get at a unicode
# subtable here. We remove the partially loaded cmap and
# restore it later.
# This only happens if the cmap table is loaded before any
# other table that does f.getGlyphOrder() or f.getGlyphName().
cmapLoading = self.tables['cmap']
del self.tables['cmap']
else:
cmapLoading = None
# Make up glyph names based on glyphID, which will be used by the
# temporary cmap and by the real cmap in case we don't find a unicode
# cmap.
numGlyphs = int(self['maxp'].numGlyphs)
glyphOrder = [None] * numGlyphs
glyphOrder[0] = ".notdef"
for i in range(1, numGlyphs):
glyphOrder[i] = "glyph%.5d" % i
# Set the glyph order, so the cmap parser has something
# to work with (so we don't get called recursively).
self.glyphOrder = glyphOrder
# Get a (new) temporary cmap (based on the just invented names)
tempcmap = self['cmap'].getcmap(3, 1)
if tempcmap is not None:
# we have a unicode cmap
from fontTools import agl
cmap = tempcmap.cmap
# create a reverse cmap dict
reversecmap = {}
for unicode, name in cmap.items():
reversecmap[name] = unicode
allNames = {}
for i in range(numGlyphs):
tempName = glyphOrder[i]
if reversecmap.has_key(tempName):
unicode = reversecmap[tempName]
if agl.UV2AGL.has_key(unicode):
# get name from the Adobe Glyph List
glyphName = agl.UV2AGL[unicode]
else:
# create uni<CODE> name
glyphName = "uni" + string.upper(string.zfill(
hex(unicode)[2:], 4))
tempName = glyphName
n = 1
while allNames.has_key(tempName):
tempName = glyphName + "#" + `n`
n = n + 1
glyphOrder[i] = tempName
allNames[tempName] = 1
# Delete the temporary cmap table from the cache, so it can
# be parsed again with the right names.
del self.tables['cmap']
else:
pass # no unicode cmap available, stick with the invented names
self.glyphOrder = glyphOrder
if cmapLoading:
# restore partially loaded cmap, so it can continue loading
# using the proper names.
self.tables['cmap'] = cmapLoading
def getGlyphNames(self):
"""Get a list of glyph names, sorted alphabetically."""
glyphNames = self.getGlyphOrder()[:]
glyphNames.sort()
return glyphNames
def getGlyphNames2(self):
"""Get a list of glyph names, sorted alphabetically,
but not case sensitive.
"""
from fontTools.misc import textTools
return textTools.caselessSort(self.getGlyphOrder())
def getGlyphName(self, glyphID, requireReal=0):
try:
return self.getGlyphOrder()[glyphID]
except IndexError:
if requireReal or not self.allowVID:
# XXX The ??.W8.otf font that ships with OSX uses higher glyphIDs in
# the cmap table than there are glyphs. I don't think it's legal...
return "glyph%.5d" % glyphID
else:
# user intends virtual GID support
try:
glyphName = self.VIDDict[glyphID]
except KeyError:
glyphName ="glyph%.5d" % glyphID
self.last_vid = min(glyphID, self.last_vid )
self.reverseVIDDict[glyphName] = glyphID
self.VIDDict[glyphID] = glyphName
return glyphName
def getGlyphID(self, glyphName, requireReal = 0):
if not hasattr(self, "_reverseGlyphOrderDict"):
self._buildReverseGlyphOrderDict()
glyphOrder = self.getGlyphOrder()
d = self._reverseGlyphOrderDict
if not d.has_key(glyphName):
if glyphName in glyphOrder:
self._buildReverseGlyphOrderDict()
return self.getGlyphID(glyphName)
else:
if requireReal or not self.allowVID:
raise KeyError, glyphName
else:
# user intends virtual GID support
try:
glyphID = self.reverseVIDDict[glyphName]
except KeyError:
# if name is in glyphXXX format, use the specified name.
if glyphName[:5] == "glyph":
try:
glyphID = int(glyphName[5:])
except (NameError, ValueError):
glyphID = None
if glyphID == None:
glyphID = self.last_vid -1
self.last_vid = glyphID
self.reverseVIDDict[glyphName] = glyphID
self.VIDDict[glyphID] = glyphName
return glyphID
glyphID = d[glyphName]
if glyphName <> glyphOrder[glyphID]:
self._buildReverseGlyphOrderDict()
return self.getGlyphID(glyphName)
return glyphID
def getReverseGlyphMap(self, rebuild=0):
if rebuild or not hasattr(self, "_reverseGlyphOrderDict"):
self._buildReverseGlyphOrderDict()
return self._reverseGlyphOrderDict
def _buildReverseGlyphOrderDict(self):
self._reverseGlyphOrderDict = d = {}
glyphOrder = self.getGlyphOrder()
for glyphID in range(len(glyphOrder)):
d[glyphOrder[glyphID]] = glyphID
def _writeTable(self, tag, writer, done):
"""Internal helper function for self.save(). Keeps track of
inter-table dependencies.
"""
if tag in done:
return
tableClass = getTableClass(tag)
for masterTable in tableClass.dependencies:
if masterTable not in done:
if self.has_key(masterTable):
self._writeTable(masterTable, writer, done)
else:
done.append(masterTable)
tabledata = self.getTableData(tag)
if self.verbose:
debugmsg("writing '%s' table to disk" % tag)
writer[tag] = tabledata
done.append(tag)
def getTableData(self, tag):
"""Returns raw table data, whether compiled or directly read from disk.
"""
if self.isLoaded(tag):
if self.verbose:
debugmsg("compiling '%s' table" % tag)
return self.tables[tag].compile(self)
elif self.reader and self.reader.has_key(tag):
if self.verbose:
debugmsg("Reading '%s' table from disk" % tag)
return self.reader[tag]
else:
raise KeyError, tag
def getGlyphSet(self, preferCFF=1):
"""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', but only *after* the .draw() method
has been called.
If the font is CFF-based, the outlines will be taken from the 'CFF '
table. Otherwise the outlines will be taken from the 'glyf' table.
If the font contains both a 'CFF ' and a 'glyf' table, you can use
the 'preferCFF' argument to specify which one should be taken.
"""
if preferCFF and self.has_key("CFF "):
return self["CFF "].cff.values()[0].CharStrings
if self.has_key("glyf"):
return _TTGlyphSet(self)
if self.has_key("CFF "):
return self["CFF "].cff.values()[0].CharStrings
raise TTLibError, "Font contains no outlines"
class _TTGlyphSet:
"""Generic dict-like GlyphSet class, meant as a TrueType counterpart
to CFF's CharString dict. See TTFont.getGlyphSet().
"""
# This class is distinct from the 'glyf' table itself because we need
# access to the 'hmtx' table, which could cause a dependency problem
# there when reading from XML.
def __init__(self, ttFont):
self._ttFont = ttFont
def keys(self):
return self._ttFont["glyf"].keys()
def has_key(self, glyphName):
return self._ttFont["glyf"].has_key(glyphName)
__contains__ = has_key
def __getitem__(self, glyphName):
return _TTGlyph(glyphName, self._ttFont)
def get(self, glyphName, default=None):
try:
return self[glyphName]
except KeyError:
return default
class _TTGlyph:
"""Wrapper for a TrueType glyph that supports the Pen protocol, meaning
that it has a .draw() method that takes a pen object as its only
argument. Additionally there is a 'width' attribute.
"""
def __init__(self, glyphName, ttFont):
self._glyphName = glyphName
self._ttFont = ttFont
self.width, self.lsb = self._ttFont['hmtx'][self._glyphName]
def draw(self, pen):
"""Draw the glyph onto Pen. See fontTools.pens.basePen for details
how that works.
"""
glyfTable = self._ttFont['glyf']
glyph = glyfTable[self._glyphName]
if hasattr(glyph, "xMin"):
offset = self.lsb - glyph.xMin
else:
offset = 0
if glyph.isComposite():
for component in glyph:
glyphName, transform = component.getComponentInfo()
pen.addComponent(glyphName, transform)
else:
coordinates, endPts, flags = glyph.getCoordinates(glyfTable)
if offset:
coordinates = coordinates + (offset, 0)
start = 0
for end in endPts:
end = end + 1
contour = coordinates[start:end].tolist()
cFlags = flags[start:end].tolist()
start = end
if 1 not in cFlags:
# There is not a single on-curve point on the curve,
# use pen.qCurveTo's special case by specifying None
# as the on-curve point.
contour.append(None)
pen.qCurveTo(*contour)
else:
# Shuffle the points so that contour the is guaranteed
# to *end* in an on-curve point, which we'll use for
# the moveTo.
firstOnCurve = cFlags.index(1) + 1
contour = contour[firstOnCurve:] + contour[:firstOnCurve]
cFlags = cFlags[firstOnCurve:] + cFlags[:firstOnCurve]
pen.moveTo(contour[-1])
while contour:
nextOnCurve = cFlags.index(1) + 1
if nextOnCurve == 1:
pen.lineTo(contour[0])
else:
pen.qCurveTo(*contour[:nextOnCurve])
contour = contour[nextOnCurve:]
cFlags = cFlags[nextOnCurve:]
pen.closePath()
class GlyphOrder:
"""A pseudo table. The glyph order isn't in the font as a separate
table, but it's nice to present it as such in the TTX format.
"""
def __init__(self, tag):
pass
def toXML(self, writer, ttFont):
glyphOrder = ttFont.getGlyphOrder()
writer.comment("The 'id' attribute is only for humans; "
"it is ignored when parsed.")
writer.newline()
for i in range(len(glyphOrder)):
glyphName = glyphOrder[i]
writer.simpletag("GlyphID", id=i, name=glyphName)
writer.newline()
def fromXML(self, (name, attrs, content), ttFont):
if not hasattr(self, "glyphOrder"):
self.glyphOrder = []
ttFont.setGlyphOrder(self.glyphOrder)
if name == "GlyphID":
self.glyphOrder.append(attrs["name"])
def getTableModule(tag):
"""Fetch the packer/unpacker module for a table.
Return None when no module is found.
"""
import tables
pyTag = tagToIdentifier(tag)
try:
__import__("fontTools.ttLib.tables." + pyTag)
except ImportError:
return None
else:
return getattr(tables, pyTag)
def getTableClass(tag):
"""Fetch the packer/unpacker class for a table.
Return None when no class is found.
"""
module = getTableModule(tag)
if module is None:
from tables.DefaultTable import DefaultTable
return DefaultTable
pyTag = tagToIdentifier(tag)
tableClass = getattr(module, "table_" + pyTag)
return tableClass
def newTable(tag):
"""Return a new instance of a table."""
tableClass = getTableClass(tag)
return tableClass(tag)
def _escapechar(c):
"""Helper function for tagToIdentifier()"""
import re
if re.match("[a-z0-9]", c):
return "_" + c
elif re.match("[A-Z]", c):
return c + "_"
else:
return hex(ord(c))[2:]
def tagToIdentifier(tag):
"""Convert a table tag to a valid (but UGLY) python identifier,
as well as a filename that's guaranteed to be unique even on a
caseless file system. Each character is mapped to two characters.
Lowercase letters get an underscore before the letter, uppercase
letters get an underscore after the letter. Trailing spaces are
trimmed. Illegal characters are escaped as two hex bytes. If the
result starts with a number (as the result of a hex escape), an
extra underscore is prepended. Examples:
'glyf' -> '_g_l_y_f'
'cvt ' -> '_c_v_t'
'OS/2' -> 'O_S_2f_2'
"""
import re
if tag == "GlyphOrder":
return tag
assert len(tag) == 4, "tag should be 4 characters long"
while len(tag) > 1 and tag[-1] == ' ':
tag = tag[:-1]
ident = ""
for c in tag:
ident = ident + _escapechar(c)
if re.match("[0-9]", ident):
ident = "_" + ident
return ident
def identifierToTag(ident):
"""the opposite of tagToIdentifier()"""
if ident == "GlyphOrder":
return ident
if len(ident) % 2 and ident[0] == "_":
ident = ident[1:]
assert not (len(ident) % 2)
tag = ""
for i in range(0, len(ident), 2):
if ident[i] == "_":
tag = tag + ident[i+1]
elif ident[i+1] == "_":
tag = tag + ident[i]
else:
# assume hex
tag = tag + chr(int(ident[i:i+2], 16))
# append trailing spaces
tag = tag + (4 - len(tag)) * ' '
return tag
def tagToXML(tag):
"""Similarly to tagToIdentifier(), this converts a TT tag
to a valid XML element name. Since XML element names are
case sensitive, this is a fairly simple/readable translation.
"""
import re
if tag == "OS/2":
return "OS_2"
elif tag == "GlyphOrder":
return tag
if re.match("[A-Za-z_][A-Za-z_0-9]* *$", tag):
return string.strip(tag)
else:
return tagToIdentifier(tag)
def xmlToTag(tag):
"""The opposite of tagToXML()"""
if tag == "OS_2":
return "OS/2"
if len(tag) == 8:
return identifierToTag(tag)
else:
return tag + " " * (4 - len(tag))
return tag
def debugmsg(msg):
import time
print msg + time.strftime(" (%H:%M:%S)", time.localtime(time.time()))
# Table order as recommended in the OpenType specification 1.4
TTFTableOrder = ["head", "hhea", "maxp", "OS/2", "hmtx", "LTSH", "VDMX",
"hdmx", "cmap", "fpgm", "prep", "cvt ", "loca", "glyf",
"kern", "name", "post", "gasp", "PCLT"]
OTFTableOrder = ["head", "hhea", "maxp", "OS/2", "name", "cmap", "post",
"CFF "]
def sortedTagList(tagList, tableOrder=None):
"""Return a sorted copy of tagList, sorted according to the OpenType
specification, or according to a custom tableOrder. If given and not
None, tableOrder needs to be a list of tag names.
"""
tagList = list(tagList)
tagList.sort()
if tableOrder is None:
if "DSIG" in tagList:
# DSIG should be last (XXX spec reference?)
tagList.remove("DSIG")
tagList.append("DSIG")
if "CFF " in tagList:
tableOrder = OTFTableOrder
else:
tableOrder = TTFTableOrder
orderedTables = []
for tag in tableOrder:
if tag in tagList:
orderedTables.append(tag)
tagList.remove(tag)
orderedTables.extend(tagList)
return orderedTables
def reorderFontTables(inFile, outFile, tableOrder=None, checkChecksums=0):
"""Rewrite a font file, ordering the tables as recommended by the
OpenType specification 1.4.
"""
from fontTools.ttLib.sfnt import SFNTReader,SFNTWriter
reader = SFNTReader(inFile, checkChecksums=checkChecksums)
writer = SFNTWriter(outFile, reader.numTables, reader.sfntVersion)
tables = reader.keys()
for tag in sortedTagList(tables, tableOrder):
writer[tag] = reader[tag]
writer.close()
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