module TTFunk::Table::Cmap::Format10

Attributes

code_map[R]
language[R]

Public Class Methods

encode(charmap) click to toggle source
# File lib/ttfunk/table/cmap/format10.rb, line 9
def self.encode(charmap)
  next_id = 0 
  glyph_map = { 0 => 0 }

  sorted_chars = charmap.keys.sort
  low_char, high_char = sorted_chars.first, sorted_chars.last
  entry_count = (1+high_char-low_char)
  glyph_indexes = Array.new(entry_count, 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 - low_char] = glyph_map[charmap[code]]
    map
  end

  subtable = [10, 0, 20+entry_count*4, 0, low_char, entry_count, *glyph_indexes].pack('nnN*')

  { :charmap => new_map, :subtable => subtable, :max_glyph_id => next_id+1 }
end

Public Instance Methods

[](code) click to toggle source
# File lib/ttfunk/table/cmap/format10.rb, line 30
def [](code)
  @code_map[code] || 0
end
supported?() click to toggle source
# File lib/ttfunk/table/cmap/format10.rb, line 34
def supported?
  true
end

Private Instance Methods

parse_cmap!() click to toggle source
# File lib/ttfunk/table/cmap/format10.rb, line 39
def parse_cmap!
  fractional_version, length, @language, firstcode, entrycount = read(18, 'nNNNN')
  raise NotImplementedError, "cmap version 10.#{fractional_version} is not supported" if fractional_version != 0
  @code_map = {}
  (firstcode...(firstcode+entrycount)).each do |code|
    @code_map[code] = read(2, 'n').first & 0xFFFF
  end
end