// // This code is part of Document Solutions for PDF demos. // Copyright (c) MESCIUS inc. All rights reserved. // using System; using System.IO; using System.IO.Compression; using System.Drawing; using System.Collections.Generic; using GrapeCity.Documents.Pdf; using GrapeCity.Documents.Text; using GrapeCity.Documents.Common; using GCTEXT = GrapeCity.Documents.Text; using GCDRAW = GrapeCity.Documents.Drawing; namespace DsPdfWeb.Demos { // This sample shows how to use the SavePdfOptions.UseObjectStreams property // to reduce the size of a PDF. // // Note that as with most optimizations, the size reduction will vary depending // on the actual content of the source PDF. public class ObjectStreams { public int CreatePDF(Stream stream) { // Create a 5 page non-optimal PDF: var tmpInput = MakeInputFile(); var fiInput = new FileInfo(tmpInput); // Create a new PDF, load the source PDF into it, and optimize it: var tmpOutput = Path.GetTempFileName(); var tmpDoc = new GcPdfDocument(); using (var fs = File.OpenRead(tmpInput)) { tmpDoc.Load(fs); // By default GcPdfDocument uses CompressionLevel.Fastest when saving a PDF. // If PDF size is important, we should use optimal compression: tmpDoc.CompressionLevel = CompressionLevel.Optimal; // Minimize stream sizes, use object streams: tmpDoc.Save(tmpOutput, new SavePdfOptions(SaveMode.Default, PdfStreamHandling.MinimizeSize, UseObjectStreams.Multiple)); } var fiOutput = new FileInfo(tmpOutput); // Record the input and output file sizes in the resultant PDF: var doc = new GcPdfDocument(); Common.Util.AddNote(String.Format( "Using the UseObjectStreams.Multiple option when saving a PDF will in most cases reduce the resulting file size, " + "sometimes significantly. In this case the size of the PDF generated by the 'Large Document' sample decreased " + "from {0:N0} to {1:N0} bytes, without any loss in fidelity or PDF opening speed.\n" + "Using the UseObjectStreams.Single option yields an even slightly smaller PDF size at the cost of slower opening in PDF viewers.\n" + "To reproduce these results locally, download and run this sample, specifying a valid license key " + "(otherwise loading is limited to 5 pages, and the size reduction may be too small). " + "You may also modify the sample code to keep the temporary " + "input and output files, and compare their sizes using a file manager.", fiInput.Length, fiOutput.Length), doc.NewPage()); doc.Save(stream); // Clean up: File.Delete(tmpInput); File.Delete(tmpOutput); return doc.Pages.Count; } static string MakeInputFile() { // Number of pages to generate: const int N = Common.Util.LargeDocumentIterations; var start = Common.Util.TimeNow(); var doc = new GcPdfDocument(); // Prep a TextLayout to hold/format the text: var tl = new TextLayout(72) { MaxWidth = doc.PageSize.Width, MaxHeight = doc.PageSize.Height, MarginAll = 72, FirstLineIndent = 36, }; tl.DefaultFormat.Font = StandardFonts.Times; tl.DefaultFormat.FontSize = 12; // Generate the document: for (int pageIdx = 0; pageIdx < N; ++pageIdx) { tl.Append(Common.Util.LoremIpsum(1)); tl.PerformLayout(true); doc.NewPage().Graphics.DrawTextLayout(tl, PointF.Empty); tl.Clear(); } // Insert a title page: tl.FirstLineIndent = 0; var fnt = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "NotoSerif-Regular.ttf")); var tf0 = new TextFormat() { Font = fnt, FontSize = 24, FontBold = true }; tl.Append(string.Format("Large Document\n{0} Pages of Lorem Ipsum\n\n", N), tf0); var tf1 = new TextFormat(tf0) { FontSize = 14, FontItalic = true }; tl.Append(string.Format("Generated on {0} in {1:m\\m\\ s\\s\\ fff\\m\\s}.", Common.Util.TimeNow().ToString("R"), Common.Util.TimeNow() - start), tf1); tl.TextAlignment = TextAlignment.Center; tl.PerformLayout(true); doc.Pages.Insert(0).Graphics.DrawTextLayout(tl, PointF.Empty); // Save the resultant PDF in a temp file with UseObjectStreams.None (it is the default): var outFn = Path.GetTempFileName(); doc.Save(outFn, new SavePdfOptions(SaveMode.Default, PdfStreamHandling.Copy, UseObjectStreams.None)); return outFn; } } }