VORG support by rroberts.

git-svn-id: svn://svn.code.sf.net/p/fonttools/code/trunk@408 4cde692c-a291-49d1-8350-778aa11640f8

Lib/fontTools/ttLib/tables/V_O_R_G_.py

@@ -0,0 +1,119 @@
+import DefaultTable
+import struct
+from fontTools.ttLib import sfnt
+from fontTools.misc.textTools import safeEval, readHex
+from types import TupleType, StringType
+
+
+class table_V_O_R_G_(DefaultTable.DefaultTable):
+
+	""" This table is structured so that you can treat it like a dictionary keyed by glyph name.
+	ttFont['VORG'][<glyphName>] will return the vertical origin for any glyph
+	ttFont['VORG'][<glyphName>] = <value> will set the vertical origin for any glyph.
+	"""
+
+	def decompile(self, data, ttFont):
+		self.majorVersion, self.minorVersion, self.defaultVertOriginY, self.numVertOriginYMetrics = struct.unpack(">HHhH", data[:8])
+		assert (self.majorVersion <= 1), "Major version of VORG table is higher than I knwo how to handle"
+		data = data[8:]
+		self.VOriginRecords = {}
+		for i in range(self.numVertOriginYMetrics):
+			gid, vOrigin = struct.unpack(">Hh", data[:4])
+			glyphName = ttFont.getGlyphName(gid)
+			self.VOriginRecords[glyphName] = vOrigin
+			data = data[4:]
+
+	def compile(self, ttFont):
+		glyphNames = self.VOriginRecords.keys()
+		self.numVertOriginYMetrics = len(glyphNames)
+		data = struct.pack(">HHhH", self.majorVersion, self.minorVersion, self.defaultVertOriginY, self.numVertOriginYMetrics)
+		vOriginTable = []
+		for glyphName in glyphNames:
+			try:
+				gid = ttFont.getGlyphID(glyphName)
+			except:
+				assert 0, "VORG table contains a glyph name not in ttFont.getGlyphNames(): " + str(glyphName)
+			vOriginTable.append([gid, self.VOriginRecords[glyphName]])
+		vOriginTable.sort()
+		for entry in vOriginTable:
+			data = data + struct.pack(">Hh", entry[0], entry[1])
+		return data
+
+	def toXML(self, writer, ttFont):
+		writer.simpletag("majorVersion", value=self.majorVersion)
+		writer.newline()
+		writer.simpletag("minorVersion", value=self.minorVersion)
+		writer.newline()
+		writer.simpletag("defaultVertOriginY", value=self.defaultVertOriginY)
+		writer.newline()
+		writer.simpletag("numVertOriginYMetrics", value=self.numVertOriginYMetrics)
+		writer.newline()
+		vOriginTable = []
+		glyphNames = self.VOriginRecords.keys()
+		for glyphName in glyphNames:
+			try:
+				gid = ttFont.getGlyphID(glyphName)
+			except:
+				assert 0, "VORG table contains a glyph name not in ttFont.getGlyphNames(): " + str(glyphName)
+			vOriginTable.append([gid, glyphName, self.VOriginRecords[glyphName]])
+		vOriginTable.sort()
+		for entry in vOriginTable:
+			vOriginRec = VOriginRecord(entry[1], entry[2])
+			vOriginRec.toXML(writer, ttFont)
+
+	def fromXML(self, (name, attrs, content), ttFont):
+		if name == "VOriginRecord":
+			for element in content:
+				if isinstance(element, StringType):
+					continue
+			if not hasattr(self, "VOriginRecords"):
+				self.VOriginRecords = {}
+			vOriginRec = VOriginRecord()
+			for element in content:
+				if isinstance(element, StringType):
+					continue
+				vOriginRec.fromXML(element, ttFont)
+			self.VOriginRecords[vOriginRec.glyphName] = vOriginRec.vOrigin
+		elif attrs.has_key("value"):
+			value =  safeEval(attrs["value"])
+			setattr(self, name, value)
+
+	def __getitem__(self, name):
+		if not self.VOriginRecords.has_key(name):
+			return self.defaultVertOriginY
+			
+		return self.VOriginRecords[name]
+
+	def __setitem__(self, name, value):
+		if  value != self.defaultVertOriginY:
+			self.VOriginRecords[name] = value
+		elif self.VOriginRecords.has_key(name):
+			del self.VOriginRecords[name]
+
+
+class VOriginRecord:
+
+	def __init__(self, name = None, vOrigin = None):
+		self.glyphName = name
+		self.vOrigin = vOrigin
+
+	def toXML(self, writer, ttFont):
+		writer.begintag("VOriginRecord")
+		writer.newline()
+		writer.simpletag("glyphName", value=self.glyphName)
+		writer.newline()
+		writer.simpletag("vOrigin", value=self.vOrigin)
+		writer.newline()
+		writer.endtag("VOriginRecord")
+		writer.newline()
+
+	def fromXML(self, (name, attrs, content), ttFont):
+		value = attrs["value"]
+		if name == "glyphName":
+			setattr(self, name, value)
+		else:
+			try:
+				value = safeEval(value)
+			except OverflowError:
+				value = long(value)
+			setattr(self, name, value)