//// This code is part of Document Solutions for PDF .NET demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System;using System.IO;using System.IO.Compression;using System.Drawing;using GrapeCity.Documents.Pdf;using GrapeCity.Documents.Text;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;        }    }}