Add bin and edit workflow

2026-09-16 13:11:16 -06:00
parent c8ac4fcae5
commit 4cee170d66
17576 changed files with 895740 additions and 2 deletions
@@ -0,0 +1,102 @@
+# frozen_string_literal: true
+
+module TTFunk
+  class Table
+    class Cmap
+      # Format 12: Segmented coverage.
+      #
+      # This module conditionally extends {TTFunk::Table::Cmap::Subtable}.
+      module Format12
+        # Language.
+        # @return [Integer]
+        attr_reader :language
+
+        # Code map.
+        # @return [Hash{Integer => Integer}]
+        attr_reader :code_map
+
+        # Encode the encoding record to format 12.
+        #
+        # @param charmap [Hash{Integer => Integer}] a hash mapping character
+        #   codes to glyph IDs 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_map = { 0 => 0 }
+          range_firstglyphs = []
+          range_firstcodes = []
+          range_lengths = []
+          last_glyph = last_code = -999
+
+          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]] }
+
+              if code > last_code + 1 || glyph_map[charmap[code]] > last_glyph + 1
+                range_firstcodes << code
+                range_firstglyphs << glyph_map[charmap[code]]
+                range_lengths << 1
+              else
+                range_lengths.push(range_lengths.pop) + 1
+              end
+              last_code = code
+              last_glyph = glyph_map[charmap[code]]
+            end
+
+          subtable = [
+            12, 0, 16 + (12 * range_lengths.size), 0, range_lengths.size,
+          ].pack('nnNNN')
+          range_lengths.each_with_index do |length, i|
+            firstglyph = range_firstglyphs[i]
+            firstcode = range_firstcodes[i]
+            subtable << [
+              firstcode, firstcode + length - 1, firstglyph,
+            ].pack('NNN')
+          end
+
+          { 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!
+          fractional_version, @language, groupcount = read(14, 'nx4NN')
+          if fractional_version != 0
+            raise NotImplementedError,
+              "cmap version 12.#{fractional_version} is not supported"
+          end
+          @code_map = {}
+          (1..groupcount).each do
+            startchar, endchar, startglyph = read(12, 'NNN')
+            (0..(endchar - startchar)).each do |offset|
+              @code_map[startchar + offset] = startglyph + offset
+            end
+          end
+        end
+      end
+    end
+  end
+end