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 +1,145 @@
+# frozen_string_literal: true
+
+require_relative '../table'
+
+module TTFunk
+  class Table
+    # Horizontal Header (`hhea`) table.
+    class Hhea < Table
+      # Table version
+      # @return [Integer]
+      attr_reader :version
+
+      # Typographic ascent.
+      # @return [Integer]
+      attr_reader :ascent
+
+      # Typographic descent.
+      # @return [Integer]
+      attr_reader :descent
+
+      # Typographic line gap.
+      # @return [Integer]
+      attr_reader :line_gap
+
+      # Maximum advance width value in `hmtx` table.
+      # @return [Integer]
+      attr_reader :advance_width_max
+
+      # Minimum left sidebearing value in `hmtx` table for glyphs with contours
+      # (empty glyphs should be ignored).
+      # @return [Integer]
+      attr_reader :min_left_side_bearing
+
+      # Minimum right sidebearing value.
+      # @return [Integer]
+      attr_reader :min_right_side_bearing
+
+      # Maximum extent.
+      # @return [Integer]
+      attr_reader :x_max_extent
+
+      # Caret slope rise.
+      # @return [Integer]
+      attr_reader :caret_slope_rise
+
+      # @deprecated Use {caret_slope_rise} instead.
+      # @!parse attr_reader :carot_slope_rise
+      # @return [Integer]
+      def carot_slope_rise
+        @caret_slope_rise
+      end
+
+      # Caret slope run.
+      # @return [Integer]
+      attr_reader :caret_slope_run
+
+      # @deprecated Use {caret_slope_run} instead.
+      # @!parse attr_reader :carot_slope_run
+      # @return [Integer]
+      def carot_slope_run
+        @caret_slope_run
+      end
+
+      # Caret offset.
+      # @return [Integer]
+      attr_reader :caret_offset
+
+      # Metric data format. `0` for current format.
+      # @return [Integer]
+      attr_reader :metric_data_format
+
+      # Number of hMetric entries in `hmtx` table.
+      # @return [Integer]
+      attr_reader :number_of_metrics
+
+      class << self
+        # Encode table.
+        #
+        # @param hhea [TTFunk::Table::Hhea] table to encode.
+        # @param hmtx [TTFunk::Table::Hmtx]
+        # @param original [TTFunk::File] original font file.
+        # @param mapping [Hash{Integer => Integer}] keys are new glyph IDs, values
+        #   are old glyph IDs
+        # @return [String]
+        def encode(hhea, hmtx, original, mapping)
+          ''.b.tap do |table|
+            table << [hhea.version].pack('N')
+            table << [
+              hhea.ascent, hhea.descent, hhea.line_gap,
+              *min_max_values_for(original, mapping),
+              hhea.caret_slope_rise, hhea.caret_slope_run, hhea.caret_offset,
+              0, 0, 0, 0, hhea.metric_data_format, hmtx[:number_of_metrics],
+            ].pack('n*')
+          end
+        end
+
+        private
+
+        def min_max_values_for(original, mapping)
+          min_lsb = Min.new
+          min_rsb = Min.new
+          max_aw = Max.new
+          max_extent = Max.new
+
+          mapping.each_value do |old_glyph_id|
+            horiz_metrics = original.horizontal_metrics.for(old_glyph_id)
+            next unless horiz_metrics
+
+            min_lsb << horiz_metrics.left_side_bearing
+            max_aw << horiz_metrics.advance_width
+
+            glyph = original.find_glyph(old_glyph_id)
+            next unless glyph
+
+            x_delta = glyph.x_max - glyph.x_min
+
+            min_rsb << (horiz_metrics.advance_width - horiz_metrics.left_side_bearing - x_delta)
+
+            max_extent << (horiz_metrics.left_side_bearing + x_delta)
+          end
+
+          [
+            max_aw.value_or(0), min_lsb.value_or(0),
+            min_rsb.value_or(0), max_extent.value_or(0),
+          ]
+        end
+      end
+
+      private
+
+      def parse!
+        @version = read(4, 'N').first
+        @ascent, @descent, @line_gap = read_signed(3)
+        @advance_width_max = read(2, 'n').first
+
+        @min_left_side_bearing, @min_right_side_bearing, @x_max_extent,
+          @caret_slope_rise, @caret_slope_run, @caret_offset,
+          _reserved, _reserved, _reserved, _reserved,
+          @metric_data_format = read_signed(11)
+
+        @number_of_metrics = read(2, 'n').first
+      end
+    end
+  end
+end