module TTFunk::Table::Cmap::Format00

Attributes

code_map[R]
language[R]

Public Class Methods

encode(charmap) click to toggle source

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.

# File lib/ttfunk/table/cmap/format00.rb, line 17
def self.encode(charmap)
  next_id = 0
  glyph_indexes = Array.new(256, 0)
  glyph_map = { 0 => 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] = 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

Public Instance Methods

[](code) click to toggle source
# File lib/ttfunk/table/cmap/format00.rb, line 35
def [](code)
  @code_map[code] || 0
end
supported?() click to toggle source
# File lib/ttfunk/table/cmap/format00.rb, line 39
def supported?
  true
end

Private Instance Methods

parse_cmap!() click to toggle source
# File lib/ttfunk/table/cmap/format00.rb, line 45
def parse_cmap!
  @language = read(4, 'x2n')
  @code_map = read(256, 'C*')
end