C_P_A_L_.py revision 2b06aaa2a6bcd363c25fb0c43f6bb906906594bd 
1# Copyright 2013 Google, Inc. All Rights Reserved.
2#
3# Google Author(s): Behdad Esfahbod
4
5import operator
6from . import DefaultTable
7import struct
8from fontTools.ttLib import sfnt
9from fontTools.misc.textTools import safeEval, readHex
10from types import IntType, StringType
11
12
13class table_C_P_A_L_(DefaultTable.DefaultTable):
14
15	def decompile(self, data, ttFont):
16		self.version, self.numPaletteEntries, numPalettes, numColorRecords, goffsetFirstColorRecord = struct.unpack(">HHHHL", data[:12])
17		assert (self.version == 0), "Version of COLR table is higher than I know how to handle"
18		self.palettes = []
19		pos = 12
20		for i in range(numPalettes):
21			startIndex = struct.unpack(">H", data[pos:pos+2])[0]
22			assert (startIndex + self.numPaletteEntries <= numColorRecords)
23			pos += 2
24			palette = []
25			ppos = goffsetFirstColorRecord + startIndex * 4
26			for j in range(self.numPaletteEntries):
27				palette.append( Color(*struct.unpack(">BBBB", data[ppos:ppos+4])) )
28				ppos += 4
29			self.palettes.append(palette)
30
31	def compile(self, ttFont):
32		dataList = [struct.pack(">HHHHL", self.version, self.numPaletteEntries, len(self.palettes), self.numPaletteEntries * len(self.palettes), 12+2*len(self.palettes))]
33		for i in range(len(self.palettes)):
34			dataList.append(struct.pack(">H", i*self.numPaletteEntries))
35		for palette in self.palettes:
36			assert(len(palette) == self.numPaletteEntries)
37			for color in palette:
38				dataList.append(struct.pack(">BBBB", color.blue,color.green,color.red,color.alpha))
39		data = "".join(dataList)
40		return data
41
42	def toXML(self, writer, ttFont):
43		writer.simpletag("version", value=self.version)
44		writer.newline()
45		writer.simpletag("numPaletteEntries", value=self.numPaletteEntries)
46		writer.newline()
47		for index, palette in enumerate(self.palettes):
48			writer.begintag("palette", index=index)
49			writer.newline()
50			assert(len(palette) == self.numPaletteEntries)
51			for cindex, color in enumerate(palette):
52				color.toXML(writer, ttFont, cindex)
53			writer.endtag("palette")
54			writer.newline()
55
56	def fromXML(self, (name, attrs, content), ttFont):
57		if not hasattr(self, "palettes"):
58			self.palettes = []
59		if name == "palette":
60			palette = []
61			for element in content:
62				if isinstance(element, StringType):
63					continue
64			palette = []
65			for element in content:
66				if isinstance(element, StringType):
67					continue
68				color = Color()
69				color.fromXML(element, ttFont)
70				palette.append (color)
71			self.palettes.append(palette)
72		elif "value" in attrs:
73			value =  safeEval(attrs["value"])
74			setattr(self, name, value)
75
76class Color:
77
78	def __init__(self, blue=None, green=None, red=None, alpha=None):
79		self.blue  = blue
80		self.green = green
81		self.red   = red
82		self.alpha = alpha
83
84	def hex(self):
85		return "#%02X%02X%02X%02X" % (self.red, self.green, self.blue, self.alpha)
86
87	def __repr__(self):
88		return self.hex()
89
90	def toXML(self, writer, ttFont, index=None):
91		writer.simpletag("color", value=self.hex(), index=index)
92		writer.newline()
93
94	def fromXML(self, (eltname, attrs, content), ttFont):
95		value = attrs["value"]
96		if value[0] == '#':
97			value = value[1:]
98		self.red   = int(value[0:2], 16)
99		self.green = int(value[2:4], 16)
100		self.blue  = int(value[4:6], 16)
101		self.alpha = int(value[6:8], 16) if len (value) >= 8 else 0xFF
102