maxp.rb in ttfunk-1.6.2

- old
+ new

@@ -3,13 +3,10 @@
 require_relative '../table'
 
 module TTFunk
   class Table
     class Maxp < Table
-      DEFAULT_MAX_COMPONENT_DEPTH = 1
-      MAX_V1_TABLE_LENGTH = 34
-
       attr_reader :version
       attr_reader :num_glyphs
       attr_reader :max_points
       attr_reader :max_contours
       attr_reader :max_component_points
@@ -22,153 +19,24 @@
       attr_reader :max_stack_elements
       attr_reader :max_size_of_instructions
       attr_reader :max_component_elements
       attr_reader :max_component_depth
 
-      class << self
-        def encode(maxp, new2old_glyph)
-          ''.b.tap do |table|
-            num_glyphs = new2old_glyph.length
-            table << [maxp.version, num_glyphs].pack('Nn')
-
-            if maxp.version == 0x10000
-              stats = stats_for(
-                maxp, glyphs_from_ids(maxp, new2old_glyph.values)
-              )
-
-              table << [
-                stats[:max_points],
-                stats[:max_contours],
-                stats[:max_component_points],
-                stats[:max_component_contours],
-                # these all come from the fpgm and cvt tables, which
-                # we don't support at the moment
-                maxp.max_zones,
-                maxp.max_twilight_points,
-                maxp.max_storage,
-                maxp.max_function_defs,
-                maxp.max_instruction_defs,
-                maxp.max_stack_elements,
-                stats[:max_size_of_instructions],
-                stats[:max_component_elements],
-                stats[:max_component_depth]
-              ].pack('Nn*')
-            end
-          end
-        end
-
-        private
-
-        def glyphs_from_ids(maxp, glyph_ids)
-          glyph_ids.each_with_object([]) do |glyph_id, ret|
-            if (glyph = maxp.file.glyph_outlines.for(glyph_id))
-              ret << glyph
-            end
-          end
-        end
-
-        def stats_for(maxp, glyphs)
-          stats_for_simple(maxp, glyphs)
-            .merge(stats_for_compound(maxp, glyphs))
-            .each_with_object({}) do |(name, agg), ret|
-              ret[name] = agg.value_or(0)
-            end
-        end
-
-        def stats_for_simple(_maxp, glyphs)
-          max_component_elements = Max.new
-          max_points = Max.new
-          max_contours = Max.new
-          max_size_of_instructions = Max.new
-
-          glyphs.each do |glyph|
-            if glyph.compound?
-              max_component_elements << glyph.glyph_ids.size
-            else
-              max_points << glyph.end_point_of_last_contour
-              max_contours << glyph.number_of_contours
-              max_size_of_instructions << glyph.instruction_length
-            end
-          end
-
-          {
-            max_component_elements: max_component_elements,
-            max_points: max_points,
-            max_contours: max_contours,
-            max_size_of_instructions: max_size_of_instructions
-          }
-        end
-
-        def stats_for_compound(maxp, glyphs)
-          max_component_points = Max.new
-          max_component_depth = Max.new
-          max_component_contours = Max.new
-
-          glyphs.each do |glyph|
-            next unless glyph.compound?
-
-            stats = totals_for_compound(maxp, [glyph], 0)
-            max_component_points << stats[:total_points]
-            max_component_depth << stats[:max_depth]
-            max_component_contours << stats[:total_contours]
-          end
-
-          {
-            max_component_points: max_component_points,
-            max_component_depth: max_component_depth,
-            max_component_contours: max_component_contours
-          }
-        end
-
-        def totals_for_compound(maxp, glyphs, depth)
-          total_points = Sum.new
-          total_contours = Sum.new
-          max_depth = Max.new(depth)
-
-          glyphs.each do |glyph|
-            if glyph.compound?
-              stats = totals_for_compound(
-                maxp, glyphs_from_ids(maxp, glyph.glyph_ids), depth + 1
-              )
-
-              total_points << stats[:total_points]
-              total_contours << stats[:total_contours]
-              max_depth << stats[:max_depth]
-            else
-              stats = stats_for_simple(maxp, [glyph])
-              total_points << stats[:max_points]
-              total_contours << stats[:max_contours]
-            end
-          end
-
-          {
-            total_points: total_points,
-            total_contours: total_contours,
-            max_depth: max_depth
-          }
-        end
+      def self.encode(maxp, mapping)
+        num_glyphs = mapping.length
+        raw = maxp.raw
+        raw[4, 2] = [num_glyphs].pack('n')
+        raw
       end
 
       private
 
       def parse!
-        @version, @num_glyphs = read(6, 'Nn')
-
-        if @version == 0x10000
-          @max_points, @max_contours, @max_component_points,
-            @max_component_contours, @max_zones, @max_twilight_points,
-            @max_storage, @max_function_defs, @max_instruction_defs,
-            @max_stack_elements, @max_size_of_instructions,
-            @max_component_elements = read(26, 'Nn*')
-
-          # a number of fonts omit these last two bytes for some reason,
-          # so we have to supply a default here to prevent nils
-          @max_component_depth = if length == MAX_V1_TABLE_LENGTH
-                                   read(2, 'n').first
-                                 else
-                                   DEFAULT_MAX_COMPONENT_DEPTH
-                                 end
-        end
+        @version, @num_glyphs, @max_points, @max_contours,
+          @max_component_points, @max_component_contours, @max_zones,
+          @max_twilight_points, @max_storage, @max_function_defs,
+          @max_instruction_defs, @max_stack_elements, @max_size_of_instructions,
+          @max_component_elements, @max_component_depth = read(length, 'Nn*')
       end
     end
   end
 end