91 lines
2.1 KiB
Ruby
91 lines
2.1 KiB
Ruby
# frozen_string_literal: true
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require 'set'
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require_relative 'base'
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module TTFunk
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module Subset
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# Unicode-based subset.
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class Unicode < Base
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# Space character code
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SPACE_CHAR = 0x20
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# @param original [TTFunk::File]
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def initialize(original)
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super
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@subset = Set.new
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use(SPACE_CHAR)
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end
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# Is this a Unicode-based subset?
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#
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# @return [true]
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def unicode?
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true
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end
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# Get a mapping from this subset to Unicode.
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#
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# @return [Hash{Integer => Integer}]
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def to_unicode_map
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@subset.each_with_object({}) { |code, map| map[code] = code }
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end
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# Add a character to subset.
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#
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# @param character [Integer] Unicode codepoint
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# @return [void]
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def use(character)
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@subset << character
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end
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# Can this subset include the character?
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#
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# @param _character [Integer] Unicode codepoint
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# @return [true]
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def covers?(_character)
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true
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end
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# Does this subset actually has the character?
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#
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# @param character [Integer] Unicode codepoint
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# @return [Boolean]
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def includes?(character)
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@subset.include?(character)
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end
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# Get character code for Unicode codepoint.
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#
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# @param character [Integer] Unicode codepoint
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# @return [Integer]
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def from_unicode(character)
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character
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end
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# Get `cmap` table for this subset.
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#
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# @return [TTFunk::Table::Cmap]
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def new_cmap_table
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@new_cmap_table ||=
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begin
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mapping =
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@subset.each_with_object({}) do |code, map|
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map[code] = unicode_cmap[code]
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end
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TTFunk::Table::Cmap.encode(mapping, :unicode)
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end
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end
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# Get the list of Glyph IDs from the original font that are in this
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# subset.
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#
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# @return [Array<Integer>]
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def original_glyph_ids
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([0] + @subset.map { |code| unicode_cmap[code] }).uniq.sort
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end
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end
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end
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end
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