Add support for TTC files

lib/prawn/font.rb

@@ -7,6 +7,7 @@
 require_relative 'font/afm'
 require_relative 'font/ttf'
 require_relative 'font/dfont'
+require_relative 'font/ttc'
 require_relative 'font_metric_cache'
 
 module Prawn
@@ -289,12 +290,14 @@ class Font
     attr_reader :options
 
     # Shortcut interface for constructing a font object.  Filenames of the form
-    # *.ttf will call Font::TTF.new, *.dfont Font::DFont.new, and anything else
-    # will be passed through to Font::AFM.new()
+    # *.ttf will call Font::TTF.new, *.dfont Font::DFont.new, *.ttc goes to
+    # Font::TTC.new, and anything else will be passed through to
+    # Font::AFM.new()
     def self.load(document, src, options = {})
       case font_format(src, options)
       when 'ttf'   then TTF.new(document, src, options)
       when 'dfont' then DFont.new(document, src, options)
+      when 'ttc'   then TTC.new(document, src, options)
       else AFM.new(document, src, options)
       end
     end
@@ -305,6 +308,7 @@ def self.font_format(src, options)
       case src.to_s
       when /\.ttf$/i   then return 'ttf'
       when /\.dfont$/i then return 'dfont'
+      when /\.ttc$/i   then return 'ttc'
       else return 'afm'
       end
     end

lib/prawn/font/dfont.rb

@@ -1,9 +1,3 @@
-# font.rb : The Prawn font class
-#
-# Copyright November 2008, Jamis Buck. All Rights Reserved.
-#
-# This is free software. Please see the LICENSE and COPYING files for details.
-#
 require_relative 'ttf'
 
 module Prawn

lib/prawn/font/ttc.rb

@@ -0,0 +1,34 @@
+require_relative 'ttf'
+
+module Prawn
+  class Font
+    # @private
+    class TTC < TTF
+      # Returns a list of the names of all named fonts in the given ttc file.
+      # They are returned in order of their appearance in the file.
+      #
+      def self.font_names(file)
+        TTFunk::Collection.open(file) do |ttc|
+          ttc.map { |font| font.name.font_name.first }
+        end
+      end
+
+      private
+
+      def read_ttf_file
+        TTFunk::File.from_ttc(
+          @name,
+          font_option_to_index(@name, @options[:font])
+        )
+      end
+
+      def font_option_to_index(file, option)
+        if option.is_a?(Numeric)
+          option
+        else
+          self.class.font_names(file).index { |n| n == option } || 0
+        end
+      end
+    end
+  end
+end

spec/prawn/font_spec.rb

@@ -159,6 +159,38 @@
       expect(name).to eq('subset+PanicSans-Italic')
     end
 
+    it 'allows font familes to be defined in a single ttc' do
+      file = "#{Prawn::DATADIR}/fonts/DejaVuSans.ttc"
+      pdf.font_families['DejaVu Sans'] = {
+        normal: { file: file, font: 0 },
+        bold: { file: file, font: 1 }
+      }
+
+      pdf.font 'DejaVu Sans', style: :bold
+      pdf.text 'In PanicSans-Bold'
+
+      text = PDF::Inspector::Text.analyze(pdf.render)
+      name = text.font_settings.map { |e| e[:name] }.first.to_s
+      name = name.sub(/\w+\+/, 'subset+')
+      expect(name).to eq('subset+DejaVuSans-Bold')
+    end
+
+    it 'allows fonts to be indexed by name in a ttc file' do
+      file = "#{Prawn::DATADIR}/fonts/DejaVuSans.ttc"
+      pdf.font_families['DejaVu Sans'] = {
+        normal: { file: file, font: 'DejaVu Sans' },
+        bold: { file: file, font: 'DejaVu Sans Bold' }
+      }
+
+      pdf.font 'DejaVu Sans', style: :bold
+      pdf.text 'In PanicSans-Bold'
+
+      text = PDF::Inspector::Text.analyze(pdf.render)
+      name = text.font_settings.map { |e| e[:name] }.first.to_s
+      name = name.sub(/\w+\+/, 'subset+')
+      expect(name).to eq('subset+DejaVuSans-Bold')
+    end
+
     it 'accepts Pathname objects for font files' do
       file = Pathname.new("#{Prawn::DATADIR}/fonts/DejaVuSans.ttf")
       pdf.font_families['DejaVu Sans'] = {