module TTFunk::Table::Cmap::Format06
Format 6: Trimmed table mapping.
This module conditionally extends {TTFunk::Table::Cmap::Subtable}.
Attributes
code_map[R]
Code map. @return [Hash{Integer => Integer}]
language[R]
Language. @return [Integer]
Public Class Methods
encode(charmap)
click to toggle source
Encode the encoding record to format 6.
@param charmap [Hash{Integer => Integer}] a hash mapping character
codes to glyph IDs from the original font.
@return [Hash]
* `:charmap` (<tt>Hash{Integer => Hash}</tt>) keys are the characrers in `charset`, values are hashes: * `:old` (<tt>Integer</tt>) - glyph ID in the original font. * `:new` (<tt>Integer</tt>) - glyph ID in the subset font. that maps the characters in charmap to a * `:subtable` (<tt>String</tt>) - serialized encoding record. * `:max_glyph_id` (<tt>Integer</tt>) - maximum glyph ID in the new font.
# File lib/ttfunk/table/cmap/format06.rb, line 30 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 = [ 6, 10 + (entry_count * 2), 0, low_char, entry_count, *glyph_indexes, ].pack('n*') { charmap: new_map, subtable: subtable, max_glyph_id: next_id + 1 } end
Public Instance Methods
[](code)
click to toggle source
Get glyph ID for character code.
@param code [Integer] character code. @return [Integer] glyph ID.
# File lib/ttfunk/table/cmap/format06.rb, line 58 def [](code) @code_map[code] || 0 end
supported?()
click to toggle source
Is this encoding record format supported?
@return [true]
# File lib/ttfunk/table/cmap/format06.rb, line 65 def supported? true end
Private Instance Methods
parse_cmap!()
click to toggle source
# File lib/ttfunk/table/cmap/format06.rb, line 71 def parse_cmap! @language, firstcode, entrycount = read(8, 'x2nnn') @code_map = {} (firstcode...(firstcode + entrycount)).each do |code| @code_map[code] = read(2, 'n').first & 0xFFFF end end