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 8
def self.encode(charmap)
  next_id = 0
  glyph_map = { 0 => 0 }

  sorted_chars = charmap.keys.sort
  low_char = sorted_chars.first
  high_char = sorted_chars.last
  entry_count = 1 + high_char - low_char
  glyph_indexes = Array.new(entry_count, 0)

  new_map = charmap.keys.sort.each_with_object({}) do |code, map|
    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]]
  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 32
def [](code)
  @code_map[code] || 0
end
supported?() click to toggle source
# File lib/ttfunk/table/cmap/format10.rb, line 36
def supported?
  true
end

Private Instance Methods

parse_cmap!() click to toggle source
# File lib/ttfunk/table/cmap/format10.rb, line 42
def parse_cmap!
  fractional_version, @language, firstcode, entrycount =
    read(18, 'nx4NNN')
  if fractional_version != 0
    raise NotImplementedError,
      "cmap version 10.#{fractional_version} is not supported"
  end
  @code_map = {}
  (firstcode...(firstcode + entrycount)).each do |code|
    @code_map[code] = read(2, 'n').first & 0xFFFF
  end
end