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comparison mupdf-source/thirdparty/leptonica/src/convertfiles.c @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /*====================================================================*
2 - Copyright (C) 2001 Leptonica. All rights reserved.
3 -
4 - Redistribution and use in source and binary forms, with or without
5 - modification, are permitted provided that the following conditions
6 - are met:
7 - 1. Redistributions of source code must retain the above copyright
8 - notice, this list of conditions and the following disclaimer.
9 - 2. Redistributions in binary form must reproduce the above
10 - copyright notice, this list of conditions and the following
11 - disclaimer in the documentation and/or other materials
12 - provided with the distribution.
13 -
14 - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
15 - ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
16 - LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
17 - A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ANY
18 - CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 - EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 - PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 - PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 - OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
23 - NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
24 - SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *====================================================================*/
26
27 /*!
28 * \file convertfiles.c
29 * <pre>
30 *
31 * Conversion to 1 bpp
32 * l_int32 convertFilesTo1bpp()
33 *
34 * These are utility functions that will perform depth conversion
35 * on selected files, writing the results to a specified directory.
36 * We start with conversion to 1 bpp.
37 * </pre>
38 */
39
40 #ifdef HAVE_CONFIG_H
41 #include <config_auto.h>
42 #endif /* HAVE_CONFIG_H */
43
44 #include <string.h>
45 #include "allheaders.h"
46
47 /*------------------------------------------------------------------*
48 * Conversion to 1 bpp *
49 *------------------------------------------------------------------*/
50 /*!
51 * \brief convertFilesTo1bpp()
52 *
53 * \param[in] dirin
54 * \param[in] substr [optional] substring filter on filenames;
55 8 can be NULL
56 * \param[in] upscaling 1, 2 or 4; only for input color or grayscale
57 * \param[in] thresh global threshold for binarization; 0 for default
58 * \param[in] firstpage
59 * \param[in] npages use 0 to do all from %firstpage to the end
60 * \param[in] dirout
61 * \param[in] outformat IFF_PNG, IFF_TIFF_G4
62 * \return 0 if OK, 1 on error
63 *
64 * <pre>
65 * Notes:
66 * (1) Images are sorted lexicographically, and the names in the
67 * output directory are retained except for the extension.
68 * </pre>
69 */
70 l_ok
71 convertFilesTo1bpp(const char *dirin,
72 const char *substr,
73 l_int32 upscaling,
74 l_int32 thresh,
75 l_int32 firstpage,
76 l_int32 npages,
77 const char *dirout,
78 l_int32 outformat)
79 {
80 l_int32 i, nfiles;
81 char buf[512];
82 char *fname, *tail, *basename;
83 PIX *pixs, *pixg1, *pixg2, *pixb;
84 SARRAY *safiles;
85
86 if (!dirin)
87 return ERROR_INT("dirin", __func__, 1);
88 if (!dirout)
89 return ERROR_INT("dirout", __func__, 1);
90 if (upscaling != 1 && upscaling != 2 && upscaling != 4)
91 return ERROR_INT("invalid upscaling factor", __func__, 1);
92 if (thresh <= 0) thresh = 180;
93 if (firstpage < 0) firstpage = 0;
94 if (npages < 0) npages = 0;
95 if (outformat != IFF_TIFF_G4)
96 outformat = IFF_PNG;
97
98 safiles = getSortedPathnamesInDirectory(dirin, substr, firstpage, npages);
99 if (!safiles)
100 return ERROR_INT("safiles not made", __func__, 1);
101 if ((nfiles = sarrayGetCount(safiles)) == 0) {
102 sarrayDestroy(&safiles);
103 return ERROR_INT("no matching files in the directory", __func__, 1);
104 }
105
106 for (i = 0; i < nfiles; i++) {
107 fname = sarrayGetString(safiles, i, L_NOCOPY);
108 if ((pixs = pixRead(fname)) == NULL) {
109 L_WARNING("Couldn't read file %s\n", __func__, fname);
110 continue;
111 }
112 if (pixGetDepth(pixs) == 32)
113 pixg1 = pixConvertRGBToLuminance(pixs);
114 else
115 pixg1 = pixClone(pixs);
116 pixg2 = pixRemoveColormap(pixg1, REMOVE_CMAP_TO_GRAYSCALE);
117 if (pixGetDepth(pixg2) == 1) {
118 pixb = pixClone(pixg2);
119 } else {
120 if (upscaling == 1)
121 pixb = pixThresholdToBinary(pixg2, thresh);
122 else if (upscaling == 2)
123 pixb = pixScaleGray2xLIThresh(pixg2, thresh);
124 else /* upscaling == 4 */
125 pixb = pixScaleGray4xLIThresh(pixg2, thresh);
126 }
127 pixDestroy(&pixs);
128 pixDestroy(&pixg1);
129 pixDestroy(&pixg2);
130
131 splitPathAtDirectory(fname, NULL, &tail);
132 splitPathAtExtension(tail, &basename, NULL);
133 if (outformat == IFF_TIFF_G4) {
134 snprintf(buf, sizeof(buf), "%s/%s.tif", dirout, basename);
135 pixWrite(buf, pixb, IFF_TIFF_G4);
136 } else {
137 snprintf(buf, sizeof(buf), "%s/%s.png", dirout, basename);
138 pixWrite(buf, pixb, IFF_PNG);
139 }
140 pixDestroy(&pixb);
141 LEPT_FREE(tail);
142 LEPT_FREE(basename);
143 }
144
145 sarrayDestroy(&safiles);
146 return 0;
147 }