Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/leptonica/src/renderpdf.c @ 40:aa33339d6b8a upstream

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ADD: MuPDF v1.26.10: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.5.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:31:38 +0200
parents b50eed0cc0ef
children
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1 /*====================================================================*
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2 - Copyright (C) 2001 Leptonica. All rights reserved.
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3 -
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4 - Redistribution and use in source and binary forms, with or without
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5 - modification, are permitted provided that the following conditions
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6 - are met:
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7 - 1. Redistributions of source code must retain the above copyright
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8 - notice, this list of conditions and the following disclaimer.
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9 - 2. Redistributions in binary form must reproduce the above
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10 - copyright notice, this list of conditions and the following
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11 - disclaimer in the documentation and/or other materials
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12 - provided with the distribution.
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13 -
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14 - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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15 - ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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16 - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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17 - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ANY
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18 - CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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19 - EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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20 - PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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21 - PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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22 - OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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23 - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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24 - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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25 *====================================================================*/
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26
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27 /*!
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28 * \file renderpdf.c
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29 * <pre>
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30 *
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31 * Rendering pdf files using an external library
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32 * l_int32 l_pdfRenderFile()
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33 * l_int32 l_pdfRenderFiles()
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34 *
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35 * Utility for rendering a set of pdf files as page images.
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36 * The images are rendered for full page images at a specified
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37 * resolution between 50 and 300 ppi, in the directory
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38 * /tmp/lept/renderpdf/
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39 *
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40 * An application like cleanpdf performs a sequence of:
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41 * (1) rendering the pdfs into a set of images,
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42 * (2) doing image processing on each image to generate new images, and
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43 * (3) wrapping the new images up in a single pdf file.
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44 * Typically, the processed images made by step (2) are stored compressed
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45 * in memory in a PixaComp, before wrapping them up in step (3).
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46 *
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47 * This requires the Poppler package of pdf utilities, in particular
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48 * the program pdftoppm. For non-unix systems, this requires
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49 * installation of the cygwin Poppler package:
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50 * https://cygwin.com/cgi-bin2/package-cat.cgi?file=x86/poppler/
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51 * poppler-0.26.5-1
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52 *
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53 * For the rasterizer, use pdftoppm:
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54 * pdftoppm -r res fname outroot ('-r res' renders output at res ppi)
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55 * This works on all pdf pages, both wrapped images and pages that
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56 * were made orthographically. The default output resolution for
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57 * pdftoppm is 150 ppi, but we typically use 300 ppi. This makes large
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58 * uncompressed RGB image files (e.g., a standard size RGB page image
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59 * at 300 ppi is 25 MB), but it is very fast.
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60 *
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61 * The size of the resulting images does not depend on the resolution
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62 * of the images stored in the input pdf. We compute the value of the
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63 * resolution parameter (render_res) that when input to pdftoppm
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64 * will generate a page-size image (612 x 792 pts) at the requested
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65 * output resolution.
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66 *
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67 * We do NOT use pdfimages:
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68 * pdfimages -j fname outroot (-j outputs jpeg if input is dct)
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69 * pdfimages only works when all pages are pdf wrappers around images.
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70 * Further, in some cases, it scrambles the order of the output pages
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71 * and inserts extra images.
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72
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73 * By default, this function will not run, because it makes a call
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74 * to system(1). To render pdfs as a set of images in a directory,
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75 * three things are required:
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76 * (1) To have poppler installed.
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77 * (2) To enable debug operations using setLeptDebugOK(1).
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78 * (3) To link the functions that generate pdf files in the library
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79 * (in pdfio1.c, pdfio2.c).
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80 * </pre>
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81 */
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82
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83 #ifdef HAVE_CONFIG_H
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84 #include <config_auto.h>
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85 #endif /* HAVE_CONFIG_H */
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86
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87 #include "allheaders.h"
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88
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89 /* --------------------------------------------*/
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90 #if USE_PDFIO /* defined in environ.h */
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91 /* --------------------------------------------*/
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92
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93 /*-----------------------------------------------------------------*
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94 * Rendering pdf files using an external library *
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95 *-----------------------------------------------------------------*/
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96 /*!
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97 * \brief l_pdfRenderFile()
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98 *
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99 * \param[in] filename input pdf file
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100 * \param[in] res output resolution (0, [50 ... 300]) ppi
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101 * \param[out] psaout sarray of filenames of rasterized images
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102 * \return 0 if OK, 1 on error
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103 *
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104 * <pre>
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105 * Notes:
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106 * (1) Wrapper to l_padfRenderFiles() for a single input pdf file.
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107 * </pre>
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108 */
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109 l_ok
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110 l_pdfRenderFile(const char *filename,
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111 l_int32 res,
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112 SARRAY **psaout)
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113 {
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114 l_int32 ret;
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115 SARRAY *sain;
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116
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117 if (!psaout)
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118 return ERROR_INT("&saout not defined", __func__, 1);
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119 *psaout = NULL;
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120 if (!filename)
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121 return ERROR_INT("filename not defined", __func__, 1);
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122
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123 sain = sarrayCreate(1);
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124 sarrayAddString(sain, filename, L_COPY);
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125 ret = l_pdfRenderFiles(NULL, sain, res, psaout);
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126 sarrayDestroy(&sain);
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127 return ret;
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128 }
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129
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130
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131 /*!
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132 * \brief l_pdfRenderFiles()
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133 *
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134 * \param[in] dir directory of input pdf files
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135 * \param[in] sain sarray of input pdf filenames
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136 * \param[in] res output resolution (0, [50 ... 300]) ppi
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137 * \param[out] psaout sarray of output filenames of rendered images
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138 * \return 0 if OK, 1 on error
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139 *
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140 * <pre>
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141 * Notes:
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142 * (1) Because this uses the "system" call, it is disabled by default
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143 * on all platforms. It is not supported and therefor3 disabled
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144 * on iOS 11.
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145 * (2) Input pdf file(s) are specified either by an input directory
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146 * or an sarray with the paths. Use the sarray if it is given;
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147 * otherwise, use all files in the directory with extention "pdf",
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148 * and name the rendered images in lexical order of the filenames.
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149 * (3) The allowed output rendering resolutions are between 50 ppi
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150 * and 300 ppi. Typical resolutions are 150 and 300 ppi.
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151 * Default input value of 0 can be used for 300 ppi resolution.
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152 * (4) Images are rendered in ppm format in directory /tmp/lept/renderpdf
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153 * and named in lexical order of the input filenames. On invocation,
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154 * any existing files in this directory are removed.
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155 * (5) This requires pdftoppm from the Poppler package of pdf utilities.
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156 * </pre>
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157 */
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158 l_ok
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159 l_pdfRenderFiles(const char *dir,
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160 SARRAY *sain,
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161 l_int32 res,
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162 SARRAY **psaout)
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163 {
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164 char buf[256];
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165 char *imagedir, *firstfile, *fname, *basename, *tail;
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166 l_int32 i, nfiles, render_res;
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167 SARRAY *sa;
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168
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169 if (!LeptDebugOK) {
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170 L_INFO("running pdftoppm is disabled; "
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171 "use setLeptDebugOK(1) to enable\n", __func__);
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172 return 0;
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173 }
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174
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175 #ifdef OS_IOS /* iOS 11 does not support system() */
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176 return ERROR_INT("iOS 11 does not support system()", __func__, 0);
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177 #endif /* OS_IOS */
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178
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179 if (!psaout)
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180 return ERROR_INT("&saout not defined", __func__, 1);
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181 *psaout = NULL;
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182 if (res == 0) res = 300;
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183 if (res < 50 || res > 300)
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184 return ERROR_INT("res not in range [50 ... 300]", __func__, 1);
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185 if (!dir && !sain)
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186 return ERROR_INT("neither dir or sain are defined", __func__, 1);
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187 if (sain) {
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188 sa = sarrayCopy(sain);
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189 } else {
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190 sa = getSortedPathnamesInDirectory(dir, "pdf", 0, 0);
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191 if (!sa)
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192 return ERROR_INT("no files found in dir", __func__, 1);
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193 }
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194 nfiles = sarrayGetCount(sa);
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195
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196 /* Set up directory for rendered page images. */
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197 lept_rmdir("lept/renderpdf");
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198 lept_mkdir("lept/renderpdf");
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parents:
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199 imagedir = genPathname("/tmp/lept/renderpdf", NULL);
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200
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diff changeset
201 /* Figure out the resolution to use with the image renderer.
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202 This first checks the media box sizes, which give the output
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203 image size in printer points (1/72 inch). The largest expected
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204 output image has a max dimension of about 11 inches, corresponding
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205 to 792 points. At a resolution of 300 ppi, the max image size
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206 is then 3300. For robustness, use the median of media box sizes.
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207 If the max dimension of this median is significantly larger than
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parents:
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208 792, reduce the input resolution to the renderer. Specifically:
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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209 * Calculate the median of the MediaBox widths and heights.
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210 * If the max exceeds 850, reduce the resolution so that the max
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parents:
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211 dimension of the rendered image is 3300. The new resolution
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Franz Glasner <fzglas.hg@dom66.de>
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212 input to the renderer is reduced from 300 by the factor:
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parents:
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213 (792 / medmax)
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214 If the media boxes are not found, render a page using a small
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215 given resolution (72) and use the max dimension to find the
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Franz Glasner <fzglas.hg@dom66.de>
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216 resolution, render_res, that will produce an out with
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
217 3300 pixels in the largest dimension. */
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Franz Glasner <fzglas.hg@dom66.de>
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218 firstfile = sarrayGetString(sa, 0, L_NOCOPY);
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219 getPdfRendererResolution(firstfile, imagedir, &render_res);
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220
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221 /* The input %res gives the actual resolution at which the page is
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222 to be rendered. If this is less than 300 ppi, reduce render_res,
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parents:
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223 the resolution input to pdftoppm, by the factor:
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parents:
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224 (res / 300) */
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parents:
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225 render_res = (render_res * res) / 300;
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parents:
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226
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parents:
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227 /* Rasterize: '-r res' renders output at res ppi
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parents:
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228 * pdftoppm -r res fname outroot */
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parents:
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229 for (i = 0; i < nfiles; i++) {
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230 fname = sarrayGetString(sa, i, L_NOCOPY);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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231 splitPathAtDirectory(fname, NULL, &tail);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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232 splitPathAtExtension(tail, &basename, NULL);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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233 snprintf(buf, sizeof(buf), "pdftoppm -r %d %s %s/%s",
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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234 render_res, fname, imagedir, basename);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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235 lept_free(tail);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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236 lept_free(basename);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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237 lept_stderr("%s\n", buf);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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238 callSystemDebug(buf); /* pdftoppm */
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parents:
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239 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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240 sarrayDestroy(&sa);
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parents:
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241
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parents:
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242 /* Generate the output array of image file names */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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243 *psaout = getSortedPathnamesInDirectory(imagedir, NULL, 0, 0);
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parents:
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244 lept_free(imagedir);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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245 return 0;
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246 }
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247
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248
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diff changeset
249 /* --------------------------------------------*/
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parents:
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250 #endif /* USE_PDFIO */
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parents:
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251 /* --------------------------------------------*/
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252
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253
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parents:
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254
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parents:
diff changeset
255 /* ------------------------------------------------------------------------- *
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
256 * Stubs if pdf is not supported *
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parents:
diff changeset
257 * ------------------------------------------------------------------------- */
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parents:
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258
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parents:
diff changeset
259 /* -----------------------------------------------------------------*/
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
260 #if !USE_PDFIO
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
261 /* -----------------------------------------------------------------*/
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
262
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
263 l_ok l_pdfRenderFile(const char *filename, l_int32 res, SARRAY **psaout)
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
264 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
265 return ERROR_INT("function not present", __func__, 1);
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parents:
diff changeset
266 }
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parents:
diff changeset
267
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
268 /* -----------------------------------------------------------*/
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
269
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parents:
diff changeset
270 l_ok l_pdfRenderFiles(const char *dir, SARRAY *sain, l_int32 res,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
271 SARRAY **psaout)
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parents:
diff changeset
272 {
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parents:
diff changeset
273 return ERROR_INT("function not present", __func__, 1);
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parents:
diff changeset
274 }
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parents:
diff changeset
275
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
276 /* -----------------------------------------------------------------*/
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
277 #endif /* !USE_PDFIO */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
278 /* -----------------------------------------------------------------*/
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
279