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

        protected void FlatFreeTextFields()
        {
            if (append)
                throw new ArgumentException(MessageLocalization.GetComposedMessage("freetext.flattening.is.not.supported.in.append.mode"));

            for (int page = 1; page <= reader.NumberOfPages; ++page) {
                PdfDictionary pageDic = reader.GetPageN(page);
                PdfArray annots = pageDic.GetAsArray(PdfName.ANNOTS);
                if (annots == null)
                    continue;
                for (int idx = 0; idx < annots.Size; ++idx) {
                    PdfObject annoto = annots.GetDirectObject(idx);
                    if ((annoto is PdfIndirectReference) && !annoto.IsIndirect())
                        continue;

                    PdfDictionary annDic = (PdfDictionary)annoto;
                    if (!((PdfName)annDic.Get(PdfName.SUBTYPE)).Equals(PdfName.FREETEXT))
                        continue;
                    PdfNumber ff = annDic.GetAsNumber(PdfName.F);
                    int flags = (ff != null) ? ff.IntValue : 0;

                    if ( (flags & PdfFormField.FLAGS_PRINT) != 0 && (flags & PdfFormField.FLAGS_HIDDEN) == 0) {
                        PdfObject obj1 = annDic.Get(PdfName.AP);
                        if (obj1 == null)
                            continue;
                        PdfDictionary appDic = (obj1 is PdfIndirectReference) ?
                            (PdfDictionary) PdfReader.GetPdfObject(obj1) : (PdfDictionary) obj1;
                        PdfObject obj = appDic.Get(PdfName.N);
                        PdfAppearance app = null;
                        if (obj != null) {
                            PdfObject objReal = PdfReader.GetPdfObject(obj);

                            if (obj is PdfIndirectReference && !obj.IsIndirect())
                                app = new PdfAppearance((PdfIndirectReference)obj);
                            else if (objReal is PdfStream) {
                                ((PdfDictionary)objReal).Put(PdfName.SUBTYPE, PdfName.FORM);
                                app = new PdfAppearance((PdfIndirectReference)obj);
                            }
                            else {
                                if (objReal.IsDictionary()) {
                                    PdfName as_p = appDic.GetAsName(PdfName.AS);
                                    if (as_p != null) {
                                        PdfIndirectReference iref = (PdfIndirectReference)((PdfDictionary)objReal).Get(as_p);
                                        if (iref != null) {
                                            app = new PdfAppearance(iref);
                                            if (iref.IsIndirect()) {
                                                objReal = PdfReader.GetPdfObject(iref);
                                                ((PdfDictionary)objReal).Put(PdfName.SUBTYPE, PdfName.FORM);
                                            }
                                        }
                                    }
                                }
                            }
                        }
                        if (app != null) {
                            Rectangle box = PdfReader.GetNormalizedRectangle(annDic.GetAsArray(PdfName.RECT));
                            PdfContentByte cb = this.GetOverContent(page);
                            cb.SetLiteral("Q ");
                            cb.AddTemplate(app, box.Left, box.Bottom);
                            cb.SetLiteral("q ");
                        }
                    }
                }
                for (int idx = 0; idx < annots.Size; ++idx) {
                    PdfDictionary annot = annots.GetAsDict(idx);
                    if (annot != null) {
                        if (PdfName.FREETEXT.Equals(annot.Get(PdfName.SUBTYPE))) {
                            annots.Remove(idx);
                            --idx;
                        }
                    }
                }
                if (annots.IsEmpty()) {
                    PdfReader.KillIndirect(pageDic.Get(PdfName.ANNOTS));
                    pageDic.Remove(PdfName.ANNOTS);
                }
            }
        }