Add bin and edit workflow

bin/gems/ttfunk-1.8.0/lib/ttfunk/table/cmap/format00.rb

@@ -0,0 +1,73 @@
+# frozen_string_literal: true
+
+module TTFunk
+  class Table
+    class Cmap
+      # Format 0: Byte encoding table.
+      #
+      # This module conditionally extends {TTFunk::Table::Cmap::Subtable}.
+      module Format00
+        # Language.
+        # @return [Integer]
+        attr_reader :language
+
+        # Code map.
+        # @return [Array<Integer>]
+        attr_reader :code_map
+
+        # Encode the encoding record to format 0.
+        #
+        # @param charmap [Hash{Integer => Integer}] a hash mapping character
+        #   codes to glyph ids (where the glyph ids are from the original font).
+        # @return [Hash]
+        #   * `:charmap` (<tt>Hash{Integer => Hash}</tt>) keys are the characrers in
+        #     `charset`, values are hashes:
+        #     * `:old` (<tt>Integer</tt>) - glyph ID in the original font.
+        #     * `:new` (<tt>Integer</tt>) - glyph ID in the subset font.
+        #     that maps the characters in charmap to a
+        #   * `:subtable` (<tt>String</tt>) - serialized encoding record.
+        #   * `:max_glyph_id` (<tt>Integer</tt>) - maximum glyph ID in the new font.
+        def self.encode(charmap)
+          next_id = 0
+          glyph_indexes = Array.new(256, 0)
+          glyph_map = { 0 => 0 }
+
+          new_map =
+            charmap.keys.sort.each_with_object({}) do |code, map|
+              glyph_map[charmap[code]] ||= next_id += 1
+              map[code] = { old: charmap[code], new: glyph_map[charmap[code]] }
+              glyph_indexes[code] = glyph_map[charmap[code]]
+              map
+            end
+
+          # format, length, language, indices
+          subtable = [0, 262, 0, *glyph_indexes].pack('nnnC*')
+
+          { charmap: new_map, subtable: subtable, max_glyph_id: next_id + 1 }
+        end
+
+        # Get glyph ID for character code.
+        #
+        # @param code [Integer] character code.
+        # @return [Integer] glyph ID.
+        def [](code)
+          @code_map[code] || 0
+        end
+
+        # Is this encoding record format supported?
+        #
+        # @return [true]
+        def supported?
+          true
+        end
+
+        private
+
+        def parse_cmap!
+          @language = read(4, 'x2n')
+          @code_map = read(256, 'C*')
+        end
+      end
+    end
+  end
+end