Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/platform/java/example/MultiThreadedWithPool.java @ 32:72c1b70d4f5c

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author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 21 Sep 2025 15:10:12 +0200
parents b50eed0cc0ef
children
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1 // Copyright (C) 2022 Artifex Software, Inc.
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2 //
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3 // This file is part of MuPDF.
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4 //
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5 // MuPDF is free software: you can redistribute it and/or modify it under the
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6 // terms of the GNU Affero General Public License as published by the Free
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7 // Software Foundation, either version 3 of the License, or (at your option)
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8 // any later version.
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9 //
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10 // MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
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11 // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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12 // FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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13 // details.
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14 //
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15 // You should have received a copy of the GNU Affero General Public License
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16 // along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
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17 //
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18 // Alternative licensing terms are available from the licensor.
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19 // For commercial licensing, see <https://www.artifex.com/> or contact
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20 // Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
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21 // CA 94129, USA, for further information.
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22
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23 /**
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24 * Multi-threaded rendering using a thread pool.
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25 *
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26 * First look at MultiThreaded.java and make sure you understand it.
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27 * The caution at the top of the file mentions that creating one thread
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28 * per page in a document with many pages may create performance issues.
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29 *
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30 * The code below both renders pages to pixmaps in a Callable task scheduled on
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31 * a thread pool provided by ExecutorService. The number of threads in the
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32 * thread pool is limited to four here as an example.
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33 *
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34 * To build this example in a source tree:
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35 * make -C platform/java examples
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36 *
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37 * To render all page from a document and output PNGs, run:
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38 * java -classpath build/java/debug -Djava.library.path=build/java/debug \
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39 * example.MultiThreadedWithPool document.pdf
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40 */
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41
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42 package example;
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43
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44 /* Import classes for scheduling on a thread pool. */
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45 import java.util.*;
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46 import java.util.concurrent.*;
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47
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48 /* Import all MuPDF java classes. */
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49 import com.artifex.mupdf.fitz.*;
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51 class MultiThreadedWithPool
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52 {
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53 public static void main(String args[])
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54 {
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55 /* Parse arguments. */
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56 if (args.length < 1)
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57 {
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58 System.err.println("usage: MultiThreadedWithPool input-file");
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59 System.err.println("\tinput-file: path of PDF, XPS, CBZ or EPUB document to open");
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60 return;
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61 }
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62
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63 /* Open the document and count its pages on the main thread. */
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64 String filename = args[0];
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65 Document doc;
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66 int pageCount;
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67 try {
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68 doc = Document.openDocument(filename);
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69 } catch (RuntimeException ex) {
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70 System.err.println("cannot open document: " + ex.getMessage());
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71 return;
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72 }
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73
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74 try {
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75 pageCount = doc.countPages();
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76 } catch (RuntimeException ex) {
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77 System.err.println("cannot count document pages: " + ex.getMessage());
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78 return;
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79 }
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80
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81 /* Create an ExecutorService with a thread pool of 4 threads. */
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82 ExecutorService executor = Executors.newFixedThreadPool(4);
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83
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84 /* A list holding futures for the rendered images from each page. */
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85 List renderingFutures = new LinkedList();
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86
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87 for (int i = 0; i < pageCount; ++i) {
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88 final int pageNumber = i;
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89 try {
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90 Page page = doc.loadPage(pageNumber);
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91 final Rect bounds = page.getBounds();
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92 final DisplayList displayList = page.toDisplayList();
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93
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94 /* Append this callable to the list of page rendering futures above.
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95 * It may not be scheduled to run by the executor until later when
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96 * asking for the resulting pixmap.
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97 */
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98 renderingFutures.add(executor.submit(new Callable<Pixmap>() {
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99 public Pixmap call() {
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100 System.out.println(pageNumber + ": creating pixmap");
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101
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102 /* Create a white destination pixmap with correct dimensions. */
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Franz Glasner <fzglas.hg@dom66.de>
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103 Pixmap pixmap = new Pixmap(ColorSpace.DeviceRGB, bounds);
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Franz Glasner <fzglas.hg@dom66.de>
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104 pixmap.clear(0xff);
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105
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106 System.out.println(pageNumber + ": rendering display list to pixmap");
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107
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108 /* Run the display list through a DrawDevice which
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109 * will render the requested area of the page to the
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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110 * given pixmap.
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111 */
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112 DrawDevice dev = new DrawDevice(pixmap);
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113 displayList.run(dev, Matrix.Identity(), bounds, null);
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Franz Glasner <fzglas.hg@dom66.de>
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114 dev.close();
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115
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116 /* Return the rendered pixmap to the future. */
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117 return pixmap;
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118 }
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119 }));
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120 } catch (RuntimeException ex) {
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121 System.err.println(pageNumber + ": cannot load page, skipping render: " + ex.getMessage());
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Franz Glasner <fzglas.hg@dom66.de>
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122 renderingFutures.add(ex);
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123 }
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124 }
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125
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126 /* Get the resulting pixmap from each page rendering future. */
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127 System.out.println("awaiting " + pageCount + " futures");
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128 for (int i = 0; i < pageCount; ++i) {
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129 if (renderingFutures.get(i) instanceof Exception) {
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parents:
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130 Exception ex = (Exception) renderingFutures.get(i);
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131 System.err.println(i + ": skipping save, page loading failed: " + ex.toString());
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132 continue;
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133 }
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134
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135 Future<Pixmap> future = (Future<Pixmap>) renderingFutures.get(i);
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parents:
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136 if (future == null) {
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137 System.err.println(i + ": skipping save, page loading failed");
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parents:
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138 continue;
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139 }
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140
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141 Pixmap pixmap;
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142 try {
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143 pixmap = future.get();
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144 } catch (InterruptedException ex) {
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145 System.err.println(i + ": interrupted while waiting for rendering result, skipping all remaining pages: " + ex.getMessage());
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parents:
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146 break;
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147 } catch (ExecutionException ex) {
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148 System.err.println(i + ": skipping save, page rendering failed: " + ex.getMessage());
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parents:
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149 continue;
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150 }
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parents:
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151
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parents:
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152 /* Save destination pixmap to a PNG. */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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153 String pngfilename = String.format("out-%04d.png", i);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
154 System.out.println(i + ": saving rendered pixmap as " + pngfilename);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
155 pixmap.saveAsPNG(pngfilename);
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parents:
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156 }
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parents:
diff changeset
157
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parents:
diff changeset
158 /* Stop all thread pool threads. */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
159 executor.shutdown();
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parents:
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160
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
161 System.out.println("finally!");
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
162 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
163 }