Optimizer

1//
2// Copyright (c) 2001-2020 by PDFTron Systems Inc. All Rights Reserved.
3//
4
5using System;
6using System.Collections.Generic;
7using System.IO;
8using System.Threading.Tasks;
9using Windows.Foundation;
10
11using pdftron.PDF;
12using pdftron.SDF;
13
14using PDFNetUniversalSamples.ViewModels;
15
16namespace PDFNetSamples
17{
18    public sealed class OptimizerTest : Sample
19    {
20        public OptimizerTest() :
21            base("Optimizer", "The sample shows how to use 'pdftron.PDF.Optimizer' to reduce PDF file size by reducing the file size, removing redundant information, and compressing data streams using the latest in image compression technology. 'pdftron.PDF.Optimizer' is an optional Add-On to PDFNet Core SDK.")
22        {
23        }
24
25        public override IAsyncAction RunAsync()
26        {
27            return Task.Run(new System.Action(async () => {
28                WriteLine("--------------------------------");
29                WriteLine("Starting Optimizer Test...");
30                WriteLine("--------------------------------\n");
31                //--------------------------------------------------------------------------------
32			    // Example 1) Simple optimization of a pdf with default settings. 
33			    //
34			    try
35			    {
36                    using (PDFDoc doc = new PDFDoc(Path.Combine(InputPath, "newsletter.pdf")))
37                    {
38                        doc.InitSecurityHandler();
39                        Optimizer.Optimize(doc);
40                        String output_file_path = Path.Combine(OutputPath, "newsletter_opt1.pdf");
41                        WriteLine("Saving " + output_file_path);
42                        await doc.SaveAsync(output_file_path, SDFDocSaveOptions.e_linearized);
43                        WriteLine("Done. Results saved in " + output_file_path);
44                        await AddFileToOutputList(output_file_path).ConfigureAwait(false);
45                    }
46			    }
47			    catch (Exception e)
48			    {
49				    WriteLine(GetExceptionMessage(e));
50			    }
51				
52			    //--------------------------------------------------------------------------------
53			    // Example 2) Reduce image quality and use jpeg compression for
54			    // non monochrome images.
55			    try
56			    {
57                    using (PDFDoc doc = new PDFDoc(Path.Combine(InputPath, "newsletter.pdf")))
58                    {
59                        doc.InitSecurityHandler();
60
61                        OptimizerImageSettings image_settings = new OptimizerImageSettings();
62
63                        // low quality jpeg compression
64                        image_settings.SetCompressionMode(OptimizerImageSettingsCompressionMode.e_jpeg);
65                        image_settings.SetQuality(1);
66
67                        // Set the output dpi to be standard screen resolution
68                        image_settings.SetImageDPI(144, 96);
69
70                        // this option will recompress images not compressed with
71                        // jpeg compression and use the result if the new image
72                        // is smaller.
73                        image_settings.ForceRecompression(true);
74
75                        // this option is not commonly used since it can 
76                        // potentially lead to larger files.  It should be enabled
77                        // only if the output compression specified should be applied
78                        // to every image of a given type regardless of the output image size
79                        //image_settings.ForceChanges(true);
80
81                        // use the same settings for both color and grayscale images
82                        OptimizerOptimizerSettings opt_settings = new OptimizerOptimizerSettings();
83                        opt_settings.SetColorImageSettings(image_settings);
84                        opt_settings.SetGrayscaleImageSettings(image_settings);
85
86
87                        Optimizer.Optimize(doc, opt_settings);
88
89                        String output_file_path = Path.Combine(OutputPath, "newsletter_opt2.pdf");
90                        WriteLine("Saving " + output_file_path);
91                        await doc.SaveAsync(output_file_path, SDFDocSaveOptions.e_linearized);
92                        WriteLine("Done. Results saved in " + output_file_path);
93                        await AddFileToOutputList(output_file_path).ConfigureAwait(false);
94                    }
95			    }
96			    catch (Exception e)
97			    {
98				    WriteLine(GetExceptionMessage(e));
99			    }
100
101			    //--------------------------------------------------------------------------------
102			    // Example 3) Use monochrome image settings and default settings
103			    // for color and grayscale images. 
104			    try
105			    {
106                    using (PDFDoc doc = new PDFDoc(Path.Combine(InputPath, "newsletter.pdf")))
107                    {
108                        doc.InitSecurityHandler();
109
110                        OptimizerMonoImageSettings mono_image_settings = new OptimizerMonoImageSettings();
111
112                        mono_image_settings.SetCompressionMode(OptimizerMonoImageSettingsCompressionMode.e_jbig2);
113                        mono_image_settings.ForceRecompression(true);
114
115                        OptimizerOptimizerSettings opt_settings = new OptimizerOptimizerSettings();
116                        opt_settings.SetMonoImageSettings(mono_image_settings);
117
118                        Optimizer.Optimize(doc, opt_settings);
119
120                        String output_file_path = Path.Combine(OutputPath, "newsletter_opt3.pdf");
121                        WriteLine("Saving " + output_file_path);
122                        await doc.SaveAsync(output_file_path, SDFDocSaveOptions.e_linearized);
123                        WriteLine("Done. Results saved in " + output_file_path);
124                        await AddFileToOutputList(output_file_path).ConfigureAwait(false);
125                    }
126			    }
127			    catch (Exception e)
128			    {
129				    WriteLine(GetExceptionMessage(e));
130                }
131
132                WriteLine("\n--------------------------------");
133                WriteLine("Done Optimizer Test.");
134                WriteLine("--------------------------------\n");
135            })).AsAsyncAction();
136		}
137	}
138}