public Stream CreateImage(string html)
{
if (String.IsNullOrWhiteSpace(html))
return new RenderTargetBitmap(Width, 1, 0, 0, PixelFormats.Pbgra32).CreateStream();
string text = HttpUtility.HtmlDecode(html);
var output = new DrawingGroup();
var format = new BasicTextParagraphProperties(font, 14, FlowDirection.RightToLeft);
var words = Measurer.MeasureLines(text, Width, format, output).ToList();
var dv = new DrawingVisual();
using (var c = dv.RenderOpen())
c.DrawImage(new DrawingImage(output), new Rect(new Point(Width - output.Bounds.Width, 0), output.Bounds.Size));
var rtb = new RenderTargetBitmap(Width, (int)output.Bounds.Height, 96, 96, PixelFormats.Pbgra32);
rtb.Render(dv);
return rtb.CreateStream();
}