8413c108d2
Our footprint in the Python module namespace is all under fontTools now. User code importing sstruct should be updated to say "from fontTools.misc import sstruct".
232 lines
7.2 KiB
Python
232 lines
7.2 KiB
Python
import sys
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from fontTools.ttLib.standardGlyphOrder import standardGlyphOrder
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import DefaultTable
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import struct
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from fontTools.misc import sstruct
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import array
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from fontTools import ttLib
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from fontTools.misc.textTools import safeEval, readHex
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from types import TupleType
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postFormat = """
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>
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formatType: 16.16F
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italicAngle: 16.16F # italic angle in degrees
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underlinePosition: h
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underlineThickness: h
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isFixedPitch: L
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minMemType42: L # minimum memory if TrueType font is downloaded
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maxMemType42: L # maximum memory if TrueType font is downloaded
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minMemType1: L # minimum memory if Type1 font is downloaded
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maxMemType1: L # maximum memory if Type1 font is downloaded
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"""
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postFormatSize = sstruct.calcsize(postFormat)
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class table__p_o_s_t(DefaultTable.DefaultTable):
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def decompile(self, data, ttFont):
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sstruct.unpack(postFormat, data[:postFormatSize], self)
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data = data[postFormatSize:]
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if self.formatType == 1.0:
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self.decode_format_1_0(data, ttFont)
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elif self.formatType == 2.0:
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self.decode_format_2_0(data, ttFont)
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elif self.formatType == 3.0:
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self.decode_format_3_0(data, ttFont)
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else:
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# supported format
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raise ttLib.TTLibError, "'post' table format %f not supported" % self.formatType
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def compile(self, ttFont):
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data = sstruct.pack(postFormat, self)
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if self.formatType == 1.0:
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pass # we're done
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elif self.formatType == 2.0:
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data = data + self.encode_format_2_0(ttFont)
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elif self.formatType == 3.0:
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pass # we're done
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else:
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# supported format
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raise ttLib.TTLibError, "'post' table format %f not supported" % self.formatType
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return data
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def getGlyphOrder(self):
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"""This function will get called by a ttLib.TTFont instance.
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Do not call this function yourself, use TTFont().getGlyphOrder()
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or its relatives instead!
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"""
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if not hasattr(self, "glyphOrder"):
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raise ttLib.TTLibError, "illegal use of getGlyphOrder()"
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glyphOrder = self.glyphOrder
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del self.glyphOrder
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return glyphOrder
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def decode_format_1_0(self, data, ttFont):
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self.glyphOrder = standardGlyphOrder[:ttFont["maxp"].numGlyphs]
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def decode_format_2_0(self, data, ttFont):
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numGlyphs, = struct.unpack(">H", data[:2])
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numGlyphs = int(numGlyphs)
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if numGlyphs > ttFont['maxp'].numGlyphs:
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# Assume the numGlyphs field is bogus, so sync with maxp.
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# I've seen this in one font, and if the assumption is
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# wrong elsewhere, well, so be it: it's hard enough to
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# work around _one_ non-conforming post format...
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numGlyphs = ttFont['maxp'].numGlyphs
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data = data[2:]
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indices = array.array("H")
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indices.fromstring(data[:2*numGlyphs])
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if sys.byteorder <> "big":
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indices.byteswap()
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data = data[2*numGlyphs:]
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self.extraNames = extraNames = unpackPStrings(data)
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self.glyphOrder = glyphOrder = [None] * int(ttFont['maxp'].numGlyphs)
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for glyphID in range(numGlyphs):
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index = indices[glyphID]
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if index > 257:
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name = extraNames[index-258]
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else:
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# fetch names from standard list
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name = standardGlyphOrder[index]
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glyphOrder[glyphID] = name
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#AL990511: code added to handle the case of new glyphs without
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# entries into the 'post' table
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if numGlyphs < ttFont['maxp'].numGlyphs:
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for i in range(numGlyphs, ttFont['maxp'].numGlyphs):
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glyphOrder[i] = "glyph#%.5d" % i
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self.extraNames.append(glyphOrder[i])
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self.build_psNameMapping(ttFont)
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def build_psNameMapping(self, ttFont):
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mapping = {}
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allNames = {}
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for i in range(ttFont['maxp'].numGlyphs):
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glyphName = psName = self.glyphOrder[i]
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if allNames.has_key(glyphName):
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# make up a new glyphName that's unique
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n = allNames[glyphName]
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allNames[glyphName] = n + 1
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glyphName = glyphName + "#" + `n`
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self.glyphOrder[i] = glyphName
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mapping[glyphName] = psName
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else:
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allNames[glyphName] = 1
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self.mapping = mapping
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def decode_format_3_0(self, data, ttFont):
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# Setting self.glyphOrder to None will cause the TTFont object
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# try and construct glyph names from a Unicode cmap table.
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self.glyphOrder = None
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def encode_format_2_0(self, ttFont):
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numGlyphs = ttFont['maxp'].numGlyphs
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glyphOrder = ttFont.getGlyphOrder()
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assert len(glyphOrder) == numGlyphs
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indices = array.array("H")
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extraDict = {}
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extraNames = self.extraNames
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for i in range(len(extraNames)):
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extraDict[extraNames[i]] = i
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for glyphID in range(numGlyphs):
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glyphName = glyphOrder[glyphID]
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if self.mapping.has_key(glyphName):
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psName = self.mapping[glyphName]
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else:
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psName = glyphName
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if extraDict.has_key(psName):
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index = 258 + extraDict[psName]
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elif psName in standardGlyphOrder:
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index = standardGlyphOrder.index(psName)
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else:
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index = 258 + len(extraNames)
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extraDict[psName] = len(extraNames)
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extraNames.append(psName)
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indices.append(index)
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if sys.byteorder <> "big":
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indices.byteswap()
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return struct.pack(">H", numGlyphs) + indices.tostring() + packPStrings(extraNames)
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def toXML(self, writer, ttFont):
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formatstring, names, fixes = sstruct.getformat(postFormat)
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for name in names:
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value = getattr(self, name)
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writer.simpletag(name, value=value)
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writer.newline()
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if hasattr(self, "mapping"):
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writer.begintag("psNames")
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writer.newline()
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writer.comment("This file uses unique glyph names based on the information\n"
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"found in the 'post' table. Since these names might not be unique,\n"
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"we have to invent artificial names in case of clashes. In order to\n"
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"be able to retain the original information, we need a name to\n"
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"ps name mapping for those cases where they differ. That's what\n"
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"you see below.\n")
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writer.newline()
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items = self.mapping.items()
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items.sort()
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for name, psName in items:
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writer.simpletag("psName", name=name, psName=psName)
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writer.newline()
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writer.endtag("psNames")
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writer.newline()
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if hasattr(self, "extraNames"):
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writer.begintag("extraNames")
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writer.newline()
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writer.comment("following are the name that are not taken from the standard Mac glyph order")
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writer.newline()
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for name in self.extraNames:
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writer.simpletag("psName", name=name)
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writer.newline()
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writer.endtag("extraNames")
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writer.newline()
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if hasattr(self, "data"):
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writer.begintag("hexdata")
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writer.newline()
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writer.dumphex(self.data)
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writer.endtag("hexdata")
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writer.newline()
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def fromXML(self, (name, attrs, content), ttFont):
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if name not in ("psNames", "extraNames", "hexdata"):
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setattr(self, name, safeEval(attrs["value"]))
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elif name == "psNames":
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self.mapping = {}
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for element in content:
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if type(element) <> TupleType:
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continue
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name, attrs, content = element
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if name == "psName":
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self.mapping[attrs["name"]] = attrs["psName"]
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elif name == "extraNames":
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self.extraNames = []
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for element in content:
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if type(element) <> TupleType:
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continue
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name, attrs, content = element
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if name == "psName":
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self.extraNames.append(attrs["name"])
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else:
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self.data = readHex(content)
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def unpackPStrings(data):
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strings = []
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index = 0
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dataLen = len(data)
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while index < dataLen:
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length = ord(data[index])
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strings.append(data[index+1:index+1+length])
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index = index + 1 + length
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return strings
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def packPStrings(strings):
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data = ""
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for s in strings:
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data = data + chr(len(s)) + s
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return data
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