61 lines
1.8 KiB
Ruby
61 lines
1.8 KiB
Ruby
# frozen_string_literal: true
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module TTFunk
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class Table
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# Character to Glyph Index Mapping (`cmap`) table.
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class Cmap < Table
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# Table version.
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# @return [Integer]
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attr_reader :version
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# Encoding tables.
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# @return [Array<TTFunk::Table::Cmap::Subtable>]
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attr_reader :tables
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# Encode table.
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#
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# @param charmap [Hash{Integer => Integer}]
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# @param encoding [Symbol]
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# @return [Hash]
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# * `:charmap` (<tt>Hash{Integer => Hash}</tt>) keys are the characrers in
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# `charset`, values are hashes:
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# * `:old` (<tt>Integer</tt>) - glyph ID in the original font.
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# * `:new` (<tt>Integer</tt>) - glyph ID in the subset font.
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# that maps the characters in charmap to a
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# * `:table` (<tt>String</tt>) - serialized table.
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# * `:max_glyph_id` (<tt>Integer</tt>) - maximum glyph ID in the new font.
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def self.encode(charmap, encoding)
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result = Cmap::Subtable.encode(charmap, encoding)
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# pack 'version' and 'table-count'
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result[:table] = [0, 1, result.delete(:subtable)].pack('nnA*')
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result
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end
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# Get Unicode encoding records.
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#
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# @return [Array<TTFunk::Table::Cmap::Subtable>]
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def unicode
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# Because most callers just call .first on the result, put tables with
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# highest-number format first. Unsupported formats will be ignored.
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@unicode ||=
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@tables
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.select { |table| table.unicode? && table.supported? }
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.sort { |a, b| b.format <=> a.format }
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end
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private
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def parse!
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@version, table_count = read(4, 'nn')
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@tables =
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Array.new(table_count) do
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Cmap::Subtable.new(file, offset)
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end
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end
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end
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end
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end
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require_relative 'cmap/subtable'
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