title: Missing emoji in ITextSharp export pdf
body: <p>I search a lot of links in google but not found any valuable docs for it.</p>
  
  <p>I want to export pdf file using ITextSharp library that contains Persian, English, Emoji and special characters
  and this my code:</p>
  
  <pre><code>public PdfGenerator( BaseFont bf = null)
  {
      _bf = bf ?? BaseFont.CreateFont(Environment.GetEnvironmentVariable("windir") + @"\fonts\iransans.ttf",
                BaseFont.IDENTITY_H, true);
  
  }
  </code></pre>
  
  <p>...</p>
  
  <pre><code>var fontNormal = new Font(_bf, 12, Font.NORMAL, BaseColor.Black);
  </code></pre>
  
  <p>...</p>
  
  <pre><code>table.AddCell(new PdfPCell(new Phrase(12, text, fontNormal))
  {
     RunDirection = PdfWriter.RUN_DIRECTION_RTL,
     BorderWidth = 0,
     Padding = 20,
     Colspan = isLongText ? 3 : 2,
     CellEvent = new RoundedBorder2()
  });
  </code></pre>
  
  <p>I also change my fonts to official and well-known fonts but not change result and 
  my export file missing emojis and spec character</p>