HOW TO: Add a Watermark to a Document before loading it into the Document Viewer using Bates Stamp

[HttpPost]
public string ApplyWatermark(Uri uri)
{
   string documentId = "";

   using (RasterCodecs codecs = new RasterCodecs())
   using (WebClient client = new WebClient())
   {
      var bytes = client.DownloadData(uri.ToString());
      using (MemoryStream ms = new MemoryStream(bytes))
      {
         ms.Position = 0;
         codecs.Options.Load.AllPages = true;
         using (RasterImage image = codecs.Load(ms))
         using (RasterImage watermarkImage = AddWatermark(image))
         {
            using (MemoryStream outputStream = new MemoryStream())
            {
               codecs.Save(watermarkImage, outputStream, RasterImageFormat.RasPdfJpeg411, 24);
               var loadOptions = new LoadDocumentOptions()
               {
                  Cache = ServiceHelper.Cache,
                  CachePolicy = ServiceHelper.CreatePolicy(),
                  MimeType = "application/pdf"
               };
               using (var document = DocumentFactory.LoadFromStream(outputStream, loadOptions))
               {
                  document.AutoDeleteFromCache = false;
                  documentId = document.DocumentId;
                  document.SaveToCache();
               }
            }
         }
      }
   }

   return documentId;
}

private RasterImage AddWatermark(RasterImage image)
{
   using (AnnBatesStampComposer batesStampComposer = new AnnBatesStampComposer())
   {
      AnnBatesStampComposer.RenderingEngine = new AnnWinFormsRenderingEngine();
      AnnContainer batesStampContainer = new AnnContainer();
      batesStampContainer.Mapper.MapResolutions(image.XResolution, image.YResolution, image.XResolution, image.YResolution);
      batesStampContainer.Size = batesStampContainer.Mapper.SizeToContainerCoordinates(LeadSizeD.Create(image.Width, image.Height));

      using (AnnBatesStamp batesStamp = new AnnBatesStamp())
      {
         batesStamp.HorizontalAlignment = AnnHorizontalAlignment.Left;
         batesStamp.VerticalAlignment = AnnVerticalAlignment.Top;
         batesStamp.Logo.Opacity = 0.5;
         batesStamp.Logo.Angle = -45;
         batesStamp.Logo.StretchLogo = true;

         string imageFile = HostingEnvironment.ApplicationPhysicalPath + "Resources\\Images\\watermark.png";
         batesStamp.Logo.Picture = new AnnPicture(imageFile);
         batesStampComposer.Stamps.Add(batesStamp);
         batesStampComposer.TargetContainers.Add(batesStampContainer);

         RasterImage watermarkedImage = null;
         for (int i = 1; i <= image.PageCount; i++)
         {
            image.Page = i;
            if (watermarkedImage == null)
               watermarkedImage = AnnBatesStampComposer.RenderingEngine.RenderOnImage(batesStampContainer, image).Clone();
            else
               watermarkedImage.AddPage(AnnBatesStampComposer.RenderingEngine.RenderOnImage(batesStampContainer, image).Clone());
         }
         return watermarkedImage;
      }
   }
}

var _this = this;
var documentViewer = null;
window.onload = function () {
    var createOptions = new lt.Documents.UI.DocumentViewerCreateOptions();
    createOptions.viewCreateOptions.useElements = true;
    createOptions.thumbnailsCreateOptions.useElements = true;
    createOptions.thumbnailsContainer = document.getElementById("thumbnails");
    createOptions.viewContainer = document.getElementById("documentViewer");
    _this.documentViewer = lt.Documents.UI.DocumentViewerFactory.createDocumentViewer(createOptions);

    _this.documentViewer.commands.run(lt.Documents.UI.DocumentViewerCommands.interactivePanZoom);
    _this.documentViewer.view.preferredItemType = lt.Documents.UI.DocumentViewerItemType.svg;
    _this.documentViewer.thumbnails.imageViewer.viewHorizontalAlignment = lt.Controls.ControlAlignment.center;

    lt.Documents.DocumentFactory.serviceHost = "http://localhost:19001"; // or wherever your host is
    lt.Documents.DocumentFactory.servicePath = ""; // the path to the root of the service, which is nothing for this example
    lt.Documents.DocumentFactory.serviceApiPath = "api"; // Routing occurs at "/api", unless you change the routing in the DocumentsService

    var url = "http://demo.leadtools.com/images/pdf/leadtools.pdf";

    $.ajax({
        type: 'POST',
        contentType: "application/json; charset=utf-8",
        url: "http://localhost:19001/api/Factory/ApplyWatermark?uri=" + url,
        success: function (cacheId) {
            // Call the "LoadFromUri" and pass success and failure callbacks to the promise
            lt.Documents.DocumentFactory.loadFromCache(cacheId)
                .done(function (document) {
                // Set the document in the viewer
                documentViewer.setDocument(document);
            });
        }
    });
};