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 18
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

Public Instance Methods

[](code) click to toggle source
# File lib/ttfunk/table/cmap/format00.rb, line 36
def [](code)
  @code_map[code] || 0
end
supported?() click to toggle source
# File lib/ttfunk/table/cmap/format00.rb, line 40
def supported?
  true
end

Private Instance Methods

parse_cmap!() click to toggle source
# File lib/ttfunk/table/cmap/format00.rb, line 46
def parse_cmap!
  length, @language = read(4, "nn")
  @code_map = read(256, "C*")
end