iTextSharp.text.pdf.PdfStamperImp.AddFieldResources C# (CSharp) Метод

        protected internal void AddFieldResources()
        {
            if (fieldTemplates.Count == 0)
                return;
            PdfDictionary catalog = reader.Catalog;
            PdfDictionary acroForm = (PdfDictionary)PdfReader.GetPdfObject(catalog.Get(PdfName.ACROFORM), catalog);
            if (acroForm == null) {
                acroForm = new PdfDictionary();
                catalog.Put(PdfName.ACROFORM, acroForm);
                MarkUsed(catalog);
            }
            PdfDictionary dr = (PdfDictionary)PdfReader.GetPdfObject(acroForm.Get(PdfName.DR), acroForm);
            if (dr == null) {
                dr = new PdfDictionary();
                acroForm.Put(PdfName.DR, dr);
                MarkUsed(acroForm);
            }
            MarkUsed(dr);
            foreach (PdfTemplate template in fieldTemplates.Keys) {
                PdfFormField.MergeResources(dr, (PdfDictionary)template.Resources, this);
            }
            //            if (dr.Get(PdfName.ENCODING) == null)
            //                dr.Put(PdfName.ENCODING, PdfName.WIN_ANSI_ENCODING);
            PdfDictionary fonts = dr.GetAsDict(PdfName.FONT);
            if (fonts == null) {
                fonts = new PdfDictionary();
                dr.Put(PdfName.FONT, fonts);
            }
            if (!fonts.Contains(PdfName.HELV)) {
                PdfDictionary dic = new PdfDictionary(PdfName.FONT);
                dic.Put(PdfName.BASEFONT, PdfName.HELVETICA);
                dic.Put(PdfName.ENCODING, PdfName.WIN_ANSI_ENCODING);
                dic.Put(PdfName.NAME, PdfName.HELV);
                dic.Put(PdfName.SUBTYPE, PdfName.TYPE1);
                fonts.Put(PdfName.HELV, AddToBody(dic).IndirectReference);
            }
            if (!fonts.Contains(PdfName.ZADB)) {
                PdfDictionary dic = new PdfDictionary(PdfName.FONT);
                dic.Put(PdfName.BASEFONT, PdfName.ZAPFDINGBATS);
                dic.Put(PdfName.NAME, PdfName.ZADB);
                dic.Put(PdfName.SUBTYPE, PdfName.TYPE1);
                fonts.Put(PdfName.ZADB, AddToBody(dic).IndirectReference);
            }
            if (acroForm.Get(PdfName.DA) == null) {
                acroForm.Put(PdfName.DA, new PdfString("/Helv 0 Tf 0 g "));
                MarkUsed(acroForm);
            }
        }