memoize the normalized-height calculation

hensleyl · Jan 11, 2009 · 5a3c748 · 5a3c748
1 parent b2acc8f
commit 5a3c748
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/lib/prawn/font.rb b/lib/prawn/font.rb
@@ -210,7 +210,8 @@ def size(points=nil)
     end
 
     def height_at(size)
-      (@ascender - @descender + @line_gap) / 1000.0 * size
+      @normalized_height ||= (@ascender - @descender + @line_gap) / 1000.0
+      @normalized_height * size
     end
 
     # Gets height of current font in PDF points at current font size