class TTFunk::Table::Kern::Format0
Attributes
attributes[R]
pairs[R]
Public Class Methods
new(attributes = {})
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# File lib/ttfunk/table/kern/format0.rb, line 12 def initialize(attributes = {}) @attributes = attributes num_pairs, *pairs = attributes.delete(:data).unpack('nx6n*') @pairs = {} num_pairs.times do |i| # sanity check, in case there's a bad length somewhere break if i * 3 + 2 > pairs.length left = pairs[i * 3] right = pairs[i * 3 + 1] value = to_signed(pairs[i * 3 + 2]) @pairs[[left, right]] = value end end
Public Instance Methods
cross_stream?()
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# File lib/ttfunk/table/kern/format0.rb, line 36 def cross_stream? @attributes[:cross] end
horizontal?()
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# File lib/ttfunk/table/kern/format0.rb, line 32 def horizontal? !vertical? end
recode(mapping)
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# File lib/ttfunk/table/kern/format0.rb, line 40 def recode(mapping) subset = [] pairs.each do |(left, right), value| if mapping[left] && mapping[right] subset << [mapping[left], mapping[right], value] end end return nil if subset.empty? num_pairs = subset.length search_range = 2 * 2**(Math.log(num_pairs) / Math.log(2)).to_i entry_selector = (Math.log(search_range / 2) / Math.log(2)).to_i range_shift = (2 * num_pairs) - search_range [ attributes[:version], num_pairs * 6 + 14, attributes[:coverage], num_pairs, search_range, entry_selector, range_shift, subset ].flatten.pack('n*') end
vertical?()
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# File lib/ttfunk/table/kern/format0.rb, line 28 def vertical? @attributes[:vertical] end