class TTFunk::SubsetCollection
Public Class Methods
new(original)
click to toggle source
# File lib/ttfunk/subset_collection.rb, line 5 def initialize(original) @original = original @subsets = [Subset.for(@original, :mac_roman)] end
Public Instance Methods
[](subset)
click to toggle source
# File lib/ttfunk/subset_collection.rb, line 10 def [](subset) @subsets[subset] end
encode(characters)
click to toggle source
characters
should be an array of UTF-16 characters. Returns an array of subset chunks, where each chunk is another array of two elements. The first element is the subset number, and the second element is the string of characters to render with that font subset. The strings will be encoded for their subset font, and so may not look (in the raw) like what was passed in, but they will render correctly with the indicated subset font.
# File lib/ttfunk/subset_collection.rb, line 39 def encode(characters) return [] if characters.empty? # TODO: probably would be more optimal to nix the #use method, # and merge it into this one, so it can be done in a single # pass instead of two passes. use(characters) parts = [] current_subset = 0 current_char = 0 char = characters[current_char] loop do while @subsets[current_subset].includes?(char) char = @subsets[current_subset].from_unicode(char) if parts.empty? || parts.last[0] != current_subset encoded_char = char.chr if encoded_char.respond_to?(:force_encoding) encoded_char.force_encoding('ASCII-8BIT') end parts << [current_subset, encoded_char] else parts.last[1] << char end current_char += 1 return parts if current_char >= characters.length char = characters[current_char] end current_subset = (current_subset + 1) % @subsets.length end end
use(characters)
click to toggle source
characters
should be an array of UTF-16 characters
# File lib/ttfunk/subset_collection.rb, line 15 def use(characters) characters.each do |char| covered = false @subsets.each_with_index do |subset, _i| next unless subset.covers?(char) subset.use(char) covered = true break end unless covered @subsets << Subset.for(@original, :unicode_8bit) @subsets.last.use(char) end end end