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#******************************************************************************
# TTFontFile class
#
# This class is based on The ReportLab Open Source PDF library
# written in Python - http://www.reportlab.com/software/opensource/
# together with ideas from the OpenOffice source code and others.
#
# Version: 1.04
# Date: 2011-09-18
# Author: Ian Back <[email protected]>
# License: LGPL
# Copyright (c) Ian Back, 2010
# Ported to Python 2.7 by Mariano Reingart ([email protected]) on 2012
# This header must be retained in any redistribution or
# modification of the file.
#
#******************************************************************************
from struct import pack, unpack, unpack_from
import re
import warnings
from .php import die, substr, str_repeat, str_pad, strlen, count
from .py3k import b, ord
# Define the value used in the "head" table of a created TTF file
# 0x74727565 "true" for Mac
# 0x00010000 for Windows
# Either seems to work for a font embedded in a PDF file
# when read by Adobe Reader on a Windows PC(!)
_TTF_MAC_HEADER = False
# TrueType Font Glyph operators
GF_WORDS = (1 << 0)
GF_SCALE = (1 << 3)
GF_MORE = (1 << 5)
GF_XYSCALE = (1 << 6)
GF_TWOBYTWO = (1 << 7)
def sub32(x, y):
xlo = x[1]
xhi = x[0]
ylo = y[1]
yhi = y[0]
if (ylo > xlo):
xlo += 1 << 16
yhi += 1
reslo = xlo-ylo
if (yhi > xhi):
xhi += 1 << 16
reshi = xhi-yhi
reshi = reshi & 0xFFFF
return (reshi, reslo)
def calcChecksum(data):
if (strlen(data) % 4):
data += str_repeat(b("\0"), (4-(len(data) % 4)))
hi=0x0000
lo=0x0000
for i in range(0, len(data), 4):
hi += (ord(data[i])<<8) + ord(data[i+1])
lo += (ord(data[i+2])<<8) + ord(data[i+3])
hi += lo >> 16
lo = lo & 0xFFFF
hi = hi & 0xFFFF
return (hi, lo)
class TTFontFile:
def __init__(self):
self.maxStrLenRead = 200000 # Maximum size of glyf table to read in as string (otherwise reads each glyph from file)
def getMetrics(self, file):
self.filename = file
self.fh = open(file,'rb')
self._pos = 0
self.charWidths = []
self.glyphPos = {}
self.charToGlyph = {}
self.tables = {}
self.otables = {}
self.ascent = 0
self.descent = 0
self.TTCFonts = {}
self.version = version = self.read_ulong()
if (version==0x4F54544F):
die("Postscript outlines are not supported")
if (version==0x74746366):
die("ERROR - TrueType Fonts Collections not supported")
if (version not in (0x00010000,0x74727565)):
die("Not a TrueType font: version=" + version)
self.readTableDirectory()
self.extractInfo()
self.fh.close()
def readTableDirectory(self, ):
self.numTables = self.read_ushort()
self.searchRange = self.read_ushort()
self.entrySelector = self.read_ushort()
self.rangeShift = self.read_ushort()
self.tables = {}
for i in range(self.numTables):
record = {}
record['tag'] = self.read_tag()
record['checksum'] = (self.read_ushort(),self.read_ushort())
record['offset'] = self.read_ulong()
record['length'] = self.read_ulong()
self.tables[record['tag']] = record
def get_table_pos(self, tag):
offset = self.tables[tag]['offset']
length = self.tables[tag]['length']
return (offset, length)
def seek(self, pos):
self._pos = pos
self.fh.seek(self._pos)
def skip(self, delta):
self._pos = self._pos + delta
self.fh.seek(self._pos)
def seek_table(self, tag, offset_in_table = 0):
tpos = self.get_table_pos(tag)
self._pos = tpos[0] + offset_in_table
self.fh.seek(self._pos)
return self._pos
def read_tag(self):
self._pos += 4
return self.fh.read(4).decode("latin1")
def read_short(self):
self._pos += 2
s = self.fh.read(2)
a = (ord(s[0])<<8) + ord(s[1])
if (a & (1 << 15) ):
a = (a - (1 << 16))
return a
def unpack_short(self, s):
a = (ord(s[0])<<8) + ord(s[1])
if (a & (1 << 15) ):
a = (a - (1 << 16))
return a
def read_ushort(self):
self._pos += 2
s = self.fh.read(2)
return (ord(s[0])<<8) + ord(s[1])
def read_ulong(self):
self._pos += 4
s = self.fh.read(4)
# if large uInt32 as an integer, PHP converts it to -ve
return (ord(s[0])*16777216) + (ord(s[1])<<16) + (ord(s[2])<<8) + ord(s[3]) # 16777216 = 1<<24
def get_ushort(self, pos):
self.fh.seek(pos)
s = self.fh.read(2)
return (ord(s[0])<<8) + ord(s[1])
def get_ulong(self, pos):
self.fh.seek(pos)
s = self.fh.read(4)
# iF large uInt32 as an integer, PHP converts it to -ve
return (ord(s[0])*16777216) + (ord(s[1])<<16) + (ord(s[2])<<8) + ord(s[3]) # 16777216 = 1<<24
def pack_short(self, val):
if (val<0):
val = abs(val)
val = ~val
val += 1
return pack(">H",val)
def splice(self, stream, offset, value):
return substr(stream,0,offset) + value + substr(stream,offset+strlen(value))
def _set_ushort(self, stream, offset, value):
up = pack(">H", value)
return self.splice(stream, offset, up)
def _set_short(self, stream, offset, val):
if (val<0):
val = abs(val)
val = ~val
val += 1
up = pack(">H",val)
return self.splice(stream, offset, up)
def get_chunk(self, pos, length):
self.fh.seek(pos)
if (length <1): return ''
return (self.fh.read(length))
def get_table(self, tag):
(pos, length) = self.get_table_pos(tag)
if (length == 0):
die('Truetype font (' + self.filename + '): error reading table: ' + tag)
self.fh.seek(pos)
return (self.fh.read(length))
def add(self, tag, data):
if (tag == 'head') :
data = self.splice(data, 8, b("\0\0\0\0"))
self.otables[tag] = data
############################################/
############################################/
############################################/
def extractInfo(self):
#################/
# name - Naming table
#################/
self.sFamilyClass = 0
self.sFamilySubClass = 0
name_offset = self.seek_table("name")
format = self.read_ushort()
if (format != 0):
die("Unknown name table format " + format)
numRecords = self.read_ushort()
string_data_offset = name_offset + self.read_ushort()
names = {1:'',2:'',3:'',4:'',6:''}
K = list(names.keys())
nameCount = len(names)
for i in range(numRecords):
platformId = self.read_ushort()
encodingId = self.read_ushort()
languageId = self.read_ushort()
nameId = self.read_ushort()
length = self.read_ushort()
offset = self.read_ushort()
if (nameId not in K): continue
N = ''
if (platformId == 3 and encodingId == 1 and languageId == 0x409): # Microsoft, Unicode, US English, PS Name
opos = self._pos
self.seek(string_data_offset + offset)
if (length % 2 != 0):
die("PostScript name is UTF-16BE string of odd length")
length /= 2
N = ''
while (length > 0):
char = self.read_ushort()
N += (chr(char))
length -= 1
self._pos = opos
self.seek(opos)
elif (platformId == 1 and encodingId == 0 and languageId == 0): # Macintosh, Roman, English, PS Name
opos = self._pos
N = self.get_chunk(string_data_offset + offset, length).decode("latin1")
self._pos = opos
self.seek(opos)
if (N and names[nameId]==''):
names[nameId] = N
nameCount -= 1
if (nameCount==0): break
if (names[6]):
psName = names[6]
elif (names[4]):
psName = re.sub(' ','-',names[4])
elif (names[1]):
psName = re.sub(' ','-',names[1])
else:
psName = ''
if (not psName):
die("Could not find PostScript font name")
self.name = psName
if (names[1]):
self.familyName = names[1]
else:
self.familyName = psName
if (names[2]):
self.styleName = names[2]
else:
self.styleName = 'Regular'
if (names[4]):
self.fullName = names[4]
else:
self.fullName = psName
if (names[3]):
self.uniqueFontID = names[3]
else:
self.uniqueFontID = psName
if (names[6]):
self.fullName = names[6]
#################/
# head - Font header table
#################/
self.seek_table("head")
self.skip(18)
self.unitsPerEm = unitsPerEm = self.read_ushort()
scale = 1000 / float(unitsPerEm)
self.skip(16)
xMin = self.read_short()
yMin = self.read_short()
xMax = self.read_short()
yMax = self.read_short()
self.bbox = [(xMin*scale), (yMin*scale), (xMax*scale), (yMax*scale)]
self.skip(3*2)
indexToLocFormat = self.read_ushort()
glyphDataFormat = self.read_ushort()
if (glyphDataFormat != 0):
die('Unknown glyph data format ' + glyphDataFormat)
#################/
# hhea metrics table
#################/
# ttf2t1 seems to use this value rather than the one in OS/2 - so put in for compatibility
if ("hhea" in self.tables):
self.seek_table("hhea")
self.skip(4)
hheaAscender = self.read_short()
hheaDescender = self.read_short()
self.ascent = (hheaAscender *scale)
self.descent = (hheaDescender *scale)
#################/
# OS/2 - OS/2 and Windows metrics table
#################/
if ("OS/2" in self.tables):
self.seek_table("OS/2")
version = self.read_ushort()
self.skip(2)
usWeightClass = self.read_ushort()
self.skip(2)
fsType = self.read_ushort()
if (fsType == 0x0002 or (fsType & 0x0300) != 0):
die('ERROR - Font file ' + self.filename + ' cannot be embedded due to copyright restrictions.')
self.restrictedUse = True
self.skip(20)
sF = self.read_short()
self.sFamilyClass = (sF >> 8)
self.sFamilySubClass = (sF & 0xFF)
self._pos += 10 #PANOSE = 10 byte length
panose = self.fh.read(10)
self.skip(26)
sTypoAscender = self.read_short()
sTypoDescender = self.read_short()
if (not self.ascent):
self.ascent = (sTypoAscender*scale)
if (not self.descent):
self.descent = (sTypoDescender*scale)
if (version > 1):
self.skip(16)
sCapHeight = self.read_short()
self.capHeight = (sCapHeight*scale)
else:
self.capHeight = self.ascent
else:
usWeightClass = 500
if (not self.ascent): self.ascent = (yMax*scale)
if (not self.descent): self.descent = (yMin*scale)
self.capHeight = self.ascent
self.stemV = 50 + int(pow((usWeightClass / 65.0),2))
#################/
# post - PostScript table
#################/
self.seek_table("post")
self.skip(4)
self.italicAngle = self.read_short() + self.read_ushort() / 65536.0
self.underlinePosition = self.read_short() * scale
self.underlineThickness = self.read_short() * scale
isFixedPitch = self.read_ulong()
self.flags = 4
if (self.italicAngle!= 0):
self.flags = self.flags | 64
if (usWeightClass >= 600):
self.flags = self.flags | 262144
if (isFixedPitch):
self.flags = self.flags | 1
#################/
# hhea - Horizontal header table
#################/
self.seek_table("hhea")
self.skip(32)
metricDataFormat = self.read_ushort()
if (metricDataFormat != 0):
die('Unknown horizontal metric data format '.metricDataFormat)
numberOfHMetrics = self.read_ushort()
if (numberOfHMetrics == 0):
die('Number of horizontal metrics is 0')
#################/
# maxp - Maximum profile table
#################/
self.seek_table("maxp")
self.skip(4)
numGlyphs = self.read_ushort()
#################/
# cmap - Character to glyph index mapping table
#################/
cmap_offset = self.seek_table("cmap")
self.skip(2)
cmapTableCount = self.read_ushort()
unicode_cmap_offset = 0
unicode_cmap_offset12 = 0
for i in range(cmapTableCount):
platformID = self.read_ushort()
encodingID = self.read_ushort()
offset = self.read_ulong()
save_pos = self._pos
if platformID == 3 and encodingID == 10: # Microsoft, UCS-4
format = self.get_ushort(cmap_offset + offset)
if (format == 12):
if not unicode_cmap_offset12:
unicode_cmap_offset12 = cmap_offset + offset
break
if ((platformID == 3 and encodingID == 1) or platformID == 0): # Microsoft, Unicode
format = self.get_ushort(cmap_offset + offset)
if (format == 4):
if (not unicode_cmap_offset):
unicode_cmap_offset = cmap_offset + offset
break
self.seek(save_pos)
if not unicode_cmap_offset and not unicode_cmap_offset12:
die('Font (' + self.filename + ') does not have cmap for Unicode (platform 3, encoding 1, format 4, or platform 3, encoding 10, format 12, or platform 0, any encoding, format 4)')
glyphToChar = {}
charToGlyph = {}
if unicode_cmap_offset12:
self.getCMAP12(unicode_cmap_offset12, glyphToChar, charToGlyph)
else:
self.getCMAP4(unicode_cmap_offset, glyphToChar, charToGlyph)
#################/
# hmtx - Horizontal metrics table
#################/
self.getHMTX(numberOfHMetrics, numGlyphs, glyphToChar, scale)
############################################/
############################################/
def makeSubset(self, file, subset):
self.filename = file
self.fh = open(file ,'rb')
self._pos = 0
self.charWidths = []
self.glyphPos = {}
self.charToGlyph = {}
self.tables = {}
self.otables = {}
self.ascent = 0
self.descent = 0
self.skip(4)
self.maxUni = 0
self.readTableDirectory()
#################/
# head - Font header table
#################/
self.seek_table("head")
self.skip(50)
indexToLocFormat = self.read_ushort()
glyphDataFormat = self.read_ushort()
#################/
# hhea - Horizontal header table
#################/
self.seek_table("hhea")
self.skip(32)
metricDataFormat = self.read_ushort()
orignHmetrics = numberOfHMetrics = self.read_ushort()
#################/
# maxp - Maximum profile table
#################/
self.seek_table("maxp")
self.skip(4)
numGlyphs = self.read_ushort()
#################/
# cmap - Character to glyph index mapping table
#################/
cmap_offset = self.seek_table("cmap")
self.skip(2)
cmapTableCount = self.read_ushort()
unicode_cmap_offset = 0
unicode_cmap_offset12 = 0
for i in range(cmapTableCount):
platformID = self.read_ushort()
encodingID = self.read_ushort()
offset = self.read_ulong()
save_pos = self._pos
if platformID == 3 and encodingID == 10: # Microsoft, UCS-4
format = self.get_ushort(cmap_offset + offset)
if (format == 12):
if not unicode_cmap_offset12:
unicode_cmap_offset12 = cmap_offset + offset
break
if ((platformID == 3 and encodingID == 1) or platformID == 0): # Microsoft, Unicode
format = self.get_ushort(cmap_offset + offset)
if (format == 4):
unicode_cmap_offset = cmap_offset + offset
break
self.seek(save_pos )
if not unicode_cmap_offset and not unicode_cmap_offset12:
die('Font (' + self.filename + ') does not have cmap for Unicode (platform 3, encoding 1, format 4, or platform 3, encoding 10, format 12, or platform 0, any encoding, format 4)')
glyphToChar = {}
charToGlyph = {}
if unicode_cmap_offset12:
self.getCMAP12(unicode_cmap_offset12, glyphToChar, charToGlyph)
else:
self.getCMAP4(unicode_cmap_offset, glyphToChar, charToGlyph)
self.charToGlyph = charToGlyph
#################/
# hmtx - Horizontal metrics table
#################/
scale = 1 # not used
self.getHMTX(numberOfHMetrics, numGlyphs, glyphToChar, scale)
#################/
# loca - Index to location
#################/
self.getLOCA(indexToLocFormat, numGlyphs)
subsetglyphs = [(0, 0)] # special "sorted dict"!
subsetCharToGlyph = {}
for code in subset:
if (code in self.charToGlyph):
if (self.charToGlyph[code], code) not in subsetglyphs:
subsetglyphs.append((self.charToGlyph[code], code)) # Old Glyph ID => Unicode
subsetCharToGlyph[code] = self.charToGlyph[code] # Unicode to old GlyphID
self.maxUni = max(self.maxUni, code)
(start,dummy) = self.get_table_pos('glyf')
subsetglyphs.sort()
glyphSet = {}
n = 0
fsLastCharIndex = 0 # maximum Unicode index (character code) in this font, according to the cmap subtable for platform ID 3 and platform- specific encoding ID 0 or 1.
for originalGlyphIdx, uni in subsetglyphs:
fsLastCharIndex = max(fsLastCharIndex , uni)
glyphSet[originalGlyphIdx] = n # old glyphID to new glyphID
n += 1
codeToGlyph = {}
for uni, originalGlyphIdx in sorted(subsetCharToGlyph.items()):
codeToGlyph[uni] = glyphSet[originalGlyphIdx]
self.codeToGlyph = codeToGlyph
for originalGlyphIdx, uni in subsetglyphs:
nonlocals = {'start': start, 'glyphSet': glyphSet,
'subsetglyphs': subsetglyphs}
self.getGlyphs(originalGlyphIdx, nonlocals)
numGlyphs = numberOfHMetrics = len(subsetglyphs)
#tables copied from the original
tags = ['name']
for tag in tags:
self.add(tag, self.get_table(tag))
tags = ['cvt ', 'fpgm', 'prep', 'gasp']
for tag in tags:
if (tag in self.tables):
self.add(tag, self.get_table(tag))
# post - PostScript
opost = self.get_table('post')
post = b("\x00\x03\x00\x00") + substr(opost,4,12) + b("\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00")
self.add('post', post)
# Sort CID2GID map into segments of contiguous codes
if 0 in codeToGlyph:
del codeToGlyph[0]
#unset(codeToGlyph[65535])
rangeid = 0
range_ = {}
prevcid = -2
prevglidx = -1
# for each character
for cid, glidx in sorted(codeToGlyph.items()):
if (cid == (prevcid + 1) and glidx == (prevglidx + 1)):
range_[rangeid].append(glidx)
else:
# new range
rangeid = cid
range_[rangeid] = []
range_[rangeid].append(glidx)
prevcid = cid
prevglidx = glidx
# cmap - Character to glyph mapping - Format 4 (MS / )
segCount = len(range_) + 1 # + 1 Last segment has missing character 0xFFFF
searchRange = 1
entrySelector = 0
while (searchRange * 2 <= segCount ):
searchRange = searchRange * 2
entrySelector = entrySelector + 1
searchRange = searchRange * 2
rangeShift = segCount * 2 - searchRange
length = 16 + (8*segCount ) + (numGlyphs+1)
cmap = [0, 1, # Index : version, number of encoding subtables
3, 1, # Encoding Subtable : platform (MS=3), encoding (Unicode)
0, 12, # Encoding Subtable : offset (hi,lo)
4, length, 0, # Format 4 Mapping subtable: format, length, language
segCount*2,
searchRange,
entrySelector,
rangeShift]
range_ = sorted(range_.items())
# endCode(s)
for start, subrange in range_:
endCode = start + (len(subrange)-1)
cmap.append(endCode) # endCode(s)
cmap.append(0xFFFF) # endCode of last Segment
cmap.append(0) # reservedPad
# startCode(s)
for start, subrange in range_:
cmap.append(start) # startCode(s)
cmap.append(0xFFFF) # startCode of last Segment
# idDelta(s)
for start, subrange in range_:
idDelta = -(start-subrange[0])
n += count(subrange)
cmap.append(idDelta) # idDelta(s)
cmap.append(1) # idDelta of last Segment
# idRangeOffset(s)
for subrange in range_:
cmap.append(0) # idRangeOffset[segCount] Offset in bytes to glyph indexArray, or 0
cmap.append(0) # idRangeOffset of last Segment
for subrange, glidx in range_:
cmap.extend(glidx)
cmap.append(0) # Mapping for last character
cmapstr = b('')
for cm in cmap:
if cm >= 0:
cmapstr += pack(">H", cm)
else:
try:
cmapstr += pack(">h", cm)
except:
warnings.warn("cmap value too big/small: %s" % cm)
cmapstr += pack(">H", -cm)
self.add('cmap', cmapstr)
# glyf - Glyph data
(glyfOffset,glyfLength) = self.get_table_pos('glyf')
if (glyfLength < self.maxStrLenRead):
glyphData = self.get_table('glyf')
offsets = []
glyf = b('')
pos = 0
hmtxstr = b('')
xMinT = 0
yMinT = 0
xMaxT = 0
yMaxT = 0
advanceWidthMax = 0
minLeftSideBearing = 0
minRightSideBearing = 0
xMaxExtent = 0
maxPoints = 0 # points in non-compound glyph
maxContours = 0 # contours in non-compound glyph
maxComponentPoints = 0 # points in compound glyph
maxComponentContours = 0 # contours in compound glyph
maxComponentElements = 0 # number of glyphs referenced at top level
maxComponentDepth = 0 # levels of recursion, set to 0 if font has only simple glyphs
self.glyphdata = {}
for originalGlyphIdx, uni in subsetglyphs:
# hmtx - Horizontal Metrics
hm = self.getHMetric(orignHmetrics, originalGlyphIdx)
hmtxstr += hm
offsets.append(pos)
try:
glyphPos = self.glyphPos[originalGlyphIdx]
glyphLen = self.glyphPos[originalGlyphIdx + 1] - glyphPos
except IndexError:
warnings.warn("missing glyph %s" % (originalGlyphIdx))
glyphLen = 0
if (glyfLength < self.maxStrLenRead):
data = substr(glyphData,glyphPos,glyphLen)
else:
if (glyphLen > 0):
data = self.get_chunk(glyfOffset+glyphPos,glyphLen)
else:
data = b('')
if (glyphLen > 0):
up = unpack(">H", substr(data,0,2))[0]
if (glyphLen > 2 and (up & (1 << 15)) ): # If number of contours <= -1 i.e. composiste glyph
pos_in_glyph = 10
flags = GF_MORE
nComponentElements = 0
while (flags & GF_MORE):
nComponentElements += 1 # number of glyphs referenced at top level
up = unpack(">H", substr(data,pos_in_glyph,2))
flags = up[0]
up = unpack(">H", substr(data,pos_in_glyph+2,2))
glyphIdx = up[0]
self.glyphdata.setdefault(originalGlyphIdx, {}).setdefault('compGlyphs', []).append(glyphIdx)
try:
data = self._set_ushort(data, pos_in_glyph + 2, glyphSet[glyphIdx])
except KeyError:
data = 0
warnings.warn("missing glyph data %s" % glyphIdx)
pos_in_glyph += 4
if (flags & GF_WORDS):
pos_in_glyph += 4
else:
pos_in_glyph += 2
if (flags & GF_SCALE):
pos_in_glyph += 2
elif (flags & GF_XYSCALE):
pos_in_glyph += 4
elif (flags & GF_TWOBYTWO):
pos_in_glyph += 8
maxComponentElements = max(maxComponentElements, nComponentElements)
glyf += data
pos += glyphLen
if (pos % 4 != 0):
padding = 4 - (pos % 4)
glyf += str_repeat(b("\0"),padding)
pos += padding
offsets.append(pos)
self.add('glyf', glyf)
# hmtx - Horizontal Metrics
self.add('hmtx', hmtxstr)
# loca - Index to location
locastr = b('')
if (((pos + 1) >> 1) > 0xFFFF):
indexToLocFormat = 1 # long format
for offset in offsets:
locastr += pack(">L",offset)
else:
indexToLocFormat = 0 # short format
for offset in offsets:
locastr += pack(">H",int(offset/2))
self.add('loca', locastr)
# head - Font header
head = self.get_table('head')
head = self._set_ushort(head, 50, indexToLocFormat)
self.add('head', head)
# hhea - Horizontal Header
hhea = self.get_table('hhea')
hhea = self._set_ushort(hhea, 34, numberOfHMetrics)
self.add('hhea', hhea)
# maxp - Maximum Profile
maxp = self.get_table('maxp')
maxp = self._set_ushort(maxp, 4, numGlyphs)
self.add('maxp', maxp)
# OS/2 - OS/2
os2 = self.get_table('OS/2')
self.add('OS/2', os2 )
self.fh.close()
# Put the TTF file together
stm = self.endTTFile('')
return stm
#########################################
# Recursively get composite glyph data
def getGlyphData(self, originalGlyphIdx, nonlocals):
# &maxdepth, &depth, &points, &contours
nonlocals['depth'] += 1
nonlocals['maxdepth'] = max(nonlocals['maxdepth'], nonlocals['depth'])
if (len(self.glyphdata[originalGlyphIdx]['compGlyphs'])):
for glyphIdx in self.glyphdata[originalGlyphIdx]['compGlyphs']:
self.getGlyphData(glyphIdx, nonlocals)
elif ((self.glyphdata[originalGlyphIdx]['nContours'] > 0) and nonlocals['depth'] > 0): # simple
contours += self.glyphdata[originalGlyphIdx]['nContours']
points += self.glyphdata[originalGlyphIdx]['nPoints']
nonlocals['depth'] -= 1
#########################################
# Recursively get composite glyphs
def getGlyphs(self, originalGlyphIdx, nonlocals):
# &start, &glyphSet, &subsetglyphs)
try:
glyphPos = self.glyphPos[originalGlyphIdx]
glyphLen = self.glyphPos[originalGlyphIdx + 1] - glyphPos
except IndexError:
warnings.warn("missing glyph %s" % (originalGlyphIdx))
return
if (not glyphLen):
return
self.seek(nonlocals['start'] + glyphPos)
numberOfContours = self.read_short()
if (numberOfContours < 0):
self.skip(8)
flags = GF_MORE
while (flags & GF_MORE):
flags = self.read_ushort()
glyphIdx = self.read_ushort()
if (glyphIdx not in nonlocals['glyphSet']):
nonlocals['glyphSet'][glyphIdx] = len(nonlocals['subsetglyphs']) # old glyphID to new glyphID
nonlocals['subsetglyphs'].append((glyphIdx, 1))
savepos = self.fh.tell()
self.getGlyphs(glyphIdx, nonlocals)
self.seek(savepos)
if (flags & GF_WORDS):
self.skip(4)
else:
self.skip(2)
if (flags & GF_SCALE):
self.skip(2)
elif (flags & GF_XYSCALE):
self.skip(4)
elif (flags & GF_TWOBYTWO):
self.skip(8)
#########################################
def getHMTX(self, numberOfHMetrics, numGlyphs, glyphToChar, scale):
start = self.seek_table("hmtx")
aw = 0
self.charWidths = [0] * 256*256
nCharWidths = 0
if ((numberOfHMetrics*4) < self.maxStrLenRead):
data = self.get_chunk(start,(numberOfHMetrics*4))
arr = unpack(">%dH" % (int(len(data)/2)), data)
else:
self.seek(start)
for glyph in range(numberOfHMetrics):
if ((numberOfHMetrics*4) < self.maxStrLenRead):
aw = arr[(glyph*2)] # PHP starts arrays from index 0!? +1
else:
aw = self.read_ushort()
lsb = self.read_ushort()
if (glyph in glyphToChar or glyph == 0):
if (aw >= (1 << 15) ):
aw = 0 # 1.03 Some (arabic) fonts have -ve values for width
# although should be unsigned value - comes out as e.g. 65108 (intended -50)
if (glyph == 0):
self.defaultWidth = scale*aw
continue
for char in glyphToChar[glyph]:
if (char != 0 and char != 65535):
w = int(round(scale*aw+0.001)) # ROUND_HALF_UP in PY3K (like php)
if (w == 0): w = 65535
if (char < 196608):
self.charWidths[char] = w
nCharWidths += 1
data = self.get_chunk((start+numberOfHMetrics*4),(numGlyphs*2))
arr = unpack(">%dH" % (int(len(data)/2)), data)
diff = numGlyphs-numberOfHMetrics
for pos in range(diff):
glyph = pos + numberOfHMetrics
if (glyph in glyphToChar):
for char in glyphToChar[glyph]:
if (char != 0 and char != 65535):
w = int(round(scale*aw+0.001)) # ROUND_HALF_UP in PY3K (like php)
if (w == 0): w = 65535
if (char < 196608):
self.charWidths[char] = w
nCharWidths += 1
# NB 65535 is a set width of 0
# First bytes define number of chars in font
self.charWidths[0] = nCharWidths
def getHMetric(self, numberOfHMetrics, gid):
start = self.seek_table("hmtx")
if (gid < numberOfHMetrics):
self.seek(start+(gid*4))
hm = self.fh.read(4)
else:
self.seek(start+((numberOfHMetrics-1)*4))
hm = self.fh.read(2)
self.seek(start+(numberOfHMetrics*2)+(gid*2))
hm += self.fh.read(2)
return hm
def getLOCA(self, indexToLocFormat, numGlyphs):
start = self.seek_table('loca')
self.glyphPos = []
if (indexToLocFormat == 0):
data = self.get_chunk(start,(numGlyphs*2)+2)
arr = unpack(">%dH" % (int(len(data)/2)), data)
for n in range(numGlyphs):
self.glyphPos.append((arr[n] * 2)) # n+1 !?
elif (indexToLocFormat == 1):
data = self.get_chunk(start,(numGlyphs*4)+4)
arr = unpack(">%dL" % (int(len(data)/4)), data)
for n in range(numGlyphs):
self.glyphPos.append((arr[n])) # n+1 !?
else:
die('Unknown location table format ' + indexToLocFormat)
# CMAP Format 4
def getCMAP4(self, unicode_cmap_offset, glyphToChar, charToGlyph):
self.maxUniChar = 0
self.seek(unicode_cmap_offset + 2)
length = self.read_ushort()
limit = unicode_cmap_offset + length
self.skip(2)
segCount = int(self.read_ushort() / 2)
self.skip(6)
endCount = []
for i in range(segCount):
endCount.append(self.read_ushort())
self.skip(2)
startCount = []
for i in range(segCount):
startCount.append(self.read_ushort())
idDelta = []
for i in range(segCount):
idDelta.append(self.read_short()) # ???? was unsigned short
idRangeOffset_start = self._pos
idRangeOffset = []
for i in range(segCount):
idRangeOffset.append(self.read_ushort())
for n in range(segCount):
endpoint = (endCount[n] + 1)
for unichar in range(startCount[n], endpoint, 1):
if (idRangeOffset[n] == 0):
glyph = (unichar + idDelta[n]) & 0xFFFF
else:
offset = (unichar - startCount[n]) * 2 + idRangeOffset[n]
offset = idRangeOffset_start + 2 * n + offset
if (offset >= limit):
glyph = 0
else:
glyph = self.get_ushort(offset)
if (glyph != 0):
glyph = (glyph + idDelta[n]) & 0xFFFF
charToGlyph[unichar] = glyph
if (unichar < 196608):
self.maxUniChar = max(unichar,self.maxUniChar)
glyphToChar.setdefault(glyph, []).append(unichar)
# CMAP Format 12
def getCMAP12(self, unicode_cmap_offset, glyphToChar, charToGlyph):
self.maxUniChar = 0
# table (skip format version, should be 12)
self.seek(unicode_cmap_offset + 2)
# reserved
self.skip(2)
# table length
length = self.read_ulong()
# language (should be 0)
self.skip(4)
# groups count
grpCount = self.read_ulong()
if 2 + 2 + 4 + 4 + 4 + grpCount * 3 * 4 > length:
die("TTF format 12 cmap table too small")
for n in range(grpCount):
startCharCode = self.read_ulong()
endCharCode = self.read_ulong()
glyph = self.read_ulong()
for unichar in range(startCharCode, endCharCode + 1):
charToGlyph[unichar] = glyph
if (unichar < 196608):
self.maxUniChar = max(unichar, self.maxUniChar)
glyphToChar.setdefault(glyph, []).append(unichar)
glyph += 1
# Put the TTF file together
def endTTFile(self, stm):
stm = b('')
numTables = count(self.otables)
searchRange = 1
entrySelector = 0
while (searchRange * 2 <= numTables):
searchRange = searchRange * 2
entrySelector = entrySelector + 1
searchRange = searchRange * 16
rangeShift = numTables * 16 - searchRange
# Header
if (_TTF_MAC_HEADER):
stm += (pack(">LHHHH", 0x74727565, numTables, searchRange, entrySelector, rangeShift)) # Mac
else:
stm += (pack(">LHHHH", 0x00010000 , numTables, searchRange, entrySelector, rangeShift)) # Windows
# Table directory
tables = self.otables
offset = 12 + numTables * 16
sorted_tables = sorted(tables.items())
for tag, data in sorted_tables:
if (tag == 'head'):
head_start = offset
stm += tag.encode("latin1")
checksum = calcChecksum(data)
stm += pack(">HH", checksum[0],checksum[1])
stm += pack(">LL", offset, strlen(data))
paddedLength = (strlen(data)+3)&~3
offset = offset + paddedLength
# Table data
for tag, data in sorted_tables:
data += b("\0\0\0")
stm += substr(data,0,(strlen(data)&~3))
checksum = calcChecksum(stm)
checksum = sub32((0xB1B0,0xAFBA), checksum)
chk = pack(">HH", checksum[0],checksum[1])
stm = self.splice(stm,(head_start + 8),chk)
return stm
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