Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/platform/java/example/Example.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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2
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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 * Render a page from a document at given zoom and rotation.
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25 *
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26 * To build this example in a source tree:
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27 * make -C platform/java examples
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28 *
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29 * To render page 2 from a document (at 100% without rotation)
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30 * and output the result as PNM to stdout, run:
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31 * java -classpath build/java/debug -Djava.library.path=build/java/debug \
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32 * example.Example document.pdf 2
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33 *
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34 * For 150% size with 90 degree rotation, pass two more arguments:
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35 * java -classpath build/java/debug -Djava.library.path=build/java/debug \
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36 * example.Example document.pdf 2 150 90
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37 */
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38
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39 package example;
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40
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41 /* Import all MuPDF java classes. */
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42 import com.artifex.mupdf.fitz.*;
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43
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44 class Example
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45 {
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46 public static void main(String args[])
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47 {
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48 /* Parse arguments. */
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49 if (args.length < 2)
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50 {
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51 System.err.println("usage: Example input-file page-number [ zoom [ rotate] ]");
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52 System.err.println("\tinput-file: path of PDF, XPS, CBZ or EPUB document to open");
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53 System.err.println("\tPage numbering starts from one.");
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54 System.err.println("\tZoom level is in percent (100 percent is 72 dpi).");
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55 System.err.println("\tRotation is in degrees clockwise.");
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56 return;
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57 }
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58
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59 String filename = args[0];
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60 int pageNumber = Integer.parseInt(args[1]) - 1;
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61 float zoom = 100;
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62 if (args.length >= 3)
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63 zoom = Float.parseFloat(args[2]);
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64 float rotate = 0;
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65 if (args.length >= 4)
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66 rotate = Float.parseFloat(args[3]);
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67
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68 /* Open document using path. */
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69 Document doc;
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70 try {
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71 doc = Document.openDocument(filename);
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72 } catch (RuntimeException e) {
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73 System.err.println("Error opening document: " + e);
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74 return;
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75 }
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76
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77 /* Count the number of pages. */
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78 int pageCount;
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79 try {
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80 pageCount = doc.countPages();
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81 } catch (RuntimeException e) {
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82 System.err.println("Error counting number of pages: " + e);
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83 return;
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84 }
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85
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86 /* Check that the desired page is in range. */
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87 if (pageNumber < 0 || pageNumber >= pageCount)
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88 {
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89 System.err.println("Page number out of range: " + pageNumber + " (page count " + pageCount + ")");
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90 return;
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91 }
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92
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93 /* Load the desired page from the document. */
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94 Page page;
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95 try {
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96 page = doc.loadPage(pageNumber);
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97 } catch (RuntimeException e) {
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98 System.err.println("Error loading page " + (pageNumber + 1) + ": " + e);
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99 return;
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100 }
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101
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102 /* Create a transformation matrix based on
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103 * zoom factor and rotation supplied by user.
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104 */
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105 Matrix ctm = Matrix.Scale(zoom / 100);
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106 ctm.concat(Matrix.Rotate(rotate));
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107
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108 /* Render page to an RGB pixmap without transparency. */
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109 Pixmap pixmap = null;
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110 try {
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111 pixmap = page.toPixmap(ctm, ColorSpace.DeviceRGB, false, true);
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112 } catch (RuntimeException e) {
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113 System.err.println("Error loading page " + (pageNumber + 1) + ": " + e);
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114 return;
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115 }
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116
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117 /* Output RGB pixmap to PNM image. */
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118 System.out.println("P3");
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119 System.out.println(pixmap.getWidth() + " " + pixmap.getHeight());
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120 System.out.println("255");
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121 for (int y = 0; y < pixmap.getHeight(); y++)
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122 {
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123 for (int x = 0; x < pixmap.getWidth(); x++)
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124 {
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125 int r = ((int) pixmap.getSample(x, y, 0)) & 0xff;
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126 int g = ((int) pixmap.getSample(x, y, 1)) & 0xff;
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127 int b = ((int) pixmap.getSample(x, y, 2)) & 0xff;
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128 if (x == 0)
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129 System.out.format("%3d %3d %3d", r, g, b);
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130 else
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131 System.out.format(" %3d %3d %3d", r, g, b);
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132 }
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133 System.out.println("");
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134 }
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135 }
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136 }