HACK track the graphics state for each character

how does it vary over the page? Are there some characters that we should
ignore?

lib/pdf/reader/page_text_receiver.rb

@@ -26,6 +26,12 @@ class PageTextReceiver
       def_delegators :@state, :set_line_cap_style, :set_line_dash, :set_line_join_style
       def_delegators :@state, :set_line_width, :set_miter_limit
 
+      # Graphics State Operators (colour)
+      def_delegators :@state, :set_cmyk_color_for_stroking, :set_cmyk_color_for_nonstroking
+      def_delegators :@state, :set_gray_color_for_stroking, :set_gray_color_for_nonstroking
+      def_delegators :@state, :set_rgb_color_for_stroking, :set_rgb_color_for_nonstroking
+      def_delegators :@state, :set_stroke_color_space, :set_nonstroke_color_space
+
       # Matrix Operators
       def_delegators :@state, :concatenate_matrix
 
@@ -140,7 +146,7 @@ def internal_show_text(string)
           th = 1
           scaled_glyph_width = glyph_width * @state.font_size * th
           unless utf8_chars == SPACE
-            @characters << TextRun.new(newx, newy, scaled_glyph_width, @state.font_size, utf8_chars)
+            @characters << TextRun.new(newx, newy, scaled_glyph_width, @state.font_size, utf8_chars, @state.clone_state)
           end
           @state.process_glyph_displacement(glyph_width, 0, utf8_chars == SPACE)
         end

lib/pdf/reader/text_run.rb

@@ -7,15 +7,16 @@ class PDF::Reader
   class TextRun
     include Comparable
 
-    attr_reader :origin, :width, :font_size, :text
+    attr_reader :origin, :width, :font_size, :text, :state
 
     alias :to_s :text
 
-    def initialize(x, y, width, font_size, text)
+    def initialize(x, y, width, font_size, text, state)
       @origin = PDF::Reader::Point.new(x, y)
       @width = width
       @font_size = font_size
       @text = text
+      @state = state
     end
 
     # Allows collections of TextRun objects to be sorted. They will be sorted
@@ -62,14 +63,14 @@ def +(other)
       raise ArgumentError, "#{other} cannot be merged with this run" unless mergable?(other)
 
       if (other.x - endx) <( font_size * 0.2)
-        TextRun.new(x, y, other.endx - x, font_size, text + other.text)
+        TextRun.new(x, y, other.endx - x, font_size, text + other.text, {})
       else
-        TextRun.new(x, y, other.endx - x, font_size, "#{text} #{other.text}")
+        TextRun.new(x, y, other.endx - x, font_size, "#{text} #{other.text}", {})
       end
     end
 
     def inspect
-      "#{text} w:#{width} f:#{font_size} @#{x},#{y}"
+      "#{text} w:#{width} f:#{font_size} @#{x},#{y} #{@state.inspect}"
     end
 
     def intersect?(other_run)