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require 'set'
require 'ttfunk/subset/base'
module TTFunk
module Subset
class Unicode8Bit < Base
def initialize(original)
super
@subset = { 0x20 => 0x20 }
@unicodes = { 0x20 => 0x20 }
@next = 0x21 # apparently, PDF's don't like to use chars between 0-31
end
def unicode?
true
end
def to_unicode_map
@subset.dup
end
def use(character)
if !@unicodes.key?(character)
@subset[@next] = character
@unicodes[character] = @next
@next += 1
end
end
def covers?(character)
@unicodes.key?(character) || @next < 256
end
def includes?(character)
@unicodes.key?(character)
end
def from_unicode(character)
@unicodes[character]
end
protected
def new_cmap_table(options)
mapping = @subset.inject({}) do |map, (code,unicode)|
map[code] = unicode_cmap[unicode]
map
end
# since we're mapping a subset of the unicode glyphs into an
# arbitrary 256-character space, the actual encoding we're
# using is irrelevant. We choose MacRoman because it's a 256-character
# encoding that happens to be well-supported in both TTF and
# PDF formats.
TTFunk::Table::Cmap.encode(mapping, :mac_roman)
end
def original_glyph_ids
([0] + @unicodes.keys.map { |unicode| unicode_cmap[unicode] }).uniq.sort
end
end
end
end
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