class TTFunk::Table::Glyf

Public Class Methods

encode(glyphs, new_to_old, old_to_new) click to toggle source

Accepts a hash mapping (old) glyph-ids to glyph objects, and a hash mapping old glyph-ids to new glyph-ids.

Returns a hash containing:

  • :table - a string representing the encoded 'glyf' table containing the given glyphs.

  • :offsets - an array of offsets for each glyph

# File lib/ttfunk/table/glyf.rb, line 16
def self.encode(glyphs, new_to_old, old_to_new)
  result = { table: +'', offsets: [] }

  new_to_old.keys.sort.each do |new_id|
    glyph = glyphs[new_to_old[new_id]]
    result[:offsets] << result[:table].length
    result[:table] << glyph.recode(old_to_new) if glyph
  end

  # include an offset at the end of the table, for use in computing the
  # size of the last glyph
  result[:offsets] << result[:table].length
  result
end

Public Instance Methods

for(glyph_id) click to toggle source
# File lib/ttfunk/table/glyf.rb, line 31
def for(glyph_id)
  return @cache[glyph_id] if @cache.key?(glyph_id)

  index = file.glyph_locations.index_of(glyph_id)
  size = file.glyph_locations.size_of(glyph_id)

  if size.zero? # blank glyph, e.g. space character
    @cache[glyph_id] = nil
    return
  end

  parse_from(offset + index) do
    raw = io.read(size)
    number_of_contours = to_signed(raw.unpack1('n'))

    @cache[glyph_id] =
      if number_of_contours == -1
        Compound.new(glyph_id, raw)
      else
        Simple.new(glyph_id, raw)
      end
  end
end

Private Instance Methods

parse!() click to toggle source
# File lib/ttfunk/table/glyf.rb, line 57
def parse!
  # because the glyf table is rather complex to parse, we defer
  # the parse until we need a specific glyf, and then cache it.
  @cache = {}
end