1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
require 'ttfunk/encoding/mac_roman'
require 'ttfunk/encoding/windows_1252'
module TTFunk
class Table
class Cmap
module Format00
attr_reader :language
attr_reader :code_map
# Expects a hash mapping character codes to glyph ids (where the
# glyph ids are from the original font). Returns a hash including
# a new map (:charmap) that maps the characters in charmap to a
# another hash containing both the old (:old) and new (:new) glyph
# ids. The returned hash also includes a :subtable key, which contains
# the encoded subtable for the given charmap.
def self.encode(charmap)
next_id = 0
glyph_indexes = Array.new(256, 0)
glyph_map = { 0 => 0 }
new_map = charmap.keys.sort.inject({}) do |map, code|
glyph_map[charmap[code]] ||= next_id += 1
map[code] = { :old => charmap[code], :new => glyph_map[charmap[code]] }
glyph_indexes[code] = glyph_map[charmap[code]]
map
end
# format, length, language, indices
subtable = [0, 262, 0, *glyph_indexes].pack("nnnC*")
{ :charmap => new_map, :subtable => subtable, :max_glyph_id => next_id+1 }
end
def [](code)
@code_map[code] || 0
end
def supported?
true
end
private
def parse_cmap!
length, @language = read(4, "nn")
@code_map = read(256, "C*")
end
end
end
end
end
|
