Add Issue39 Test

src/iTextSharp.LGPLv2.Core.FunctionalTests/Issues/Issue39.cs

@@ -0,0 +1,56 @@
+using System.IO;
+using iTextSharp.text;
+using iTextSharp.text.pdf;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace iTextSharp.LGPLv2.Core.FunctionalTests.Issues
+{
+    /// <summary>
+    /// https://github.com/VahidN/iTextSharp.LGPLv2.Core/issues/39
+    /// </summary>
+    [TestClass]
+    public class Issue39
+    {
+        [TestMethod]
+        public void Verify_Issue39_CanBe_Processed()
+        {
+            var pdfFile = TestUtils.GetPdfsPath("issue39.pdf");
+            var pdfReader = new PdfReader(pdfFile);
+
+            var pdfFilePath = TestUtils.GetOutputFileName();
+            var outStream = new FileStream(pdfFilePath, FileMode.Create);
+
+            var pdfStamper = new PdfStamper(pdfReader, outStream);
+            int total = pdfReader.NumberOfPages + 1;
+            var pageSize = pdfReader.GetPageSize(1);
+            var width = pageSize.Width;
+            var height = pageSize.Height;
+
+            //var font = TestUtils.GetUnicodeFont("Tahoma", TestUtils.GetTahomaFontPath(), 10, Font.BOLD, BaseColor.Black);
+            //var font = TestUtils.GetUnicodeFont("FangSong", TestUtils.GetFontPath("simfang.ttf"), 10, Font.BOLD, BaseColor.Black);
+            var font = BaseFont.CreateFont(TestUtils.GetFontPath("simfang.ttf"), BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
+            PdfGState gs = new PdfGState();
+            for (int i = 1; i < total; i++)
+            {
+                var content = pdfStamper.GetOverContent(i);
+                gs.FillOpacity = 0.3f;
+                content.SetGState(gs);
+                content.BeginText();
+                content.SetColorFill(BaseColor.LightGray);
+                content.SetFontAndSize(font, 100);
+                content.SetTextMatrix(0, 0);
+                content.ShowTextAligned(
+                    Element.ALIGN_CENTER,
+                    "WaterMark Name ...",
+                    (width / 2) - 50,
+                    (height / 2) - 50,
+                    55);
+                content.EndText();
+            }
+
+            pdfStamper.Close();
+            pdfReader.Close();
+            outStream.Dispose();
+        }
+    }
+}