Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/leptonica/src/strokes.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 /*====================================================================*
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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 /*!
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29 * \file strokes.c
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30 * <pre>
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31 *
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32 * Operations on 1 bpp images to:
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33 * (1) measure stroke parameters, such as length and average width
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34 * (2) change the average stroke width to a given value by eroding
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35 * or dilating the image.
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36 *
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37 * These operations are intended to operate on a single text
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38 * character, to regularize the stroke width. It is expected
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39 * that character matching by correlation, as used in the recog
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40 * application, can often be improved by pre-processing both
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41 * template and character images to a fixed stroke width.
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42 *
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43 * Stroke parameter measurement
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44 * l_int32 pixFindStrokeLength()
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45 * l_int32 pixFindStrokeWidth()
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46 * NUMA *pixaFindStrokeWidth()
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47 *
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48 * Stroke width regulation
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49 * PIXA *pixaModifyStrokeWidth()
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50 * PIX *pixModifyStrokeWidth()
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51 * PIXA *pixaSetStrokeWidth()
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52 * PIX *pixSetStrokeWidth()
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53 * </pre>
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54 */
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55
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56 #ifdef HAVE_CONFIG_H
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57 #include <config_auto.h>
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58 #endif /* HAVE_CONFIG_H */
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59
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60 #include "allheaders.h"
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61
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62 /*-----------------------------------------------------------------*
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63 * Stroke parameter measurement *
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64 *-----------------------------------------------------------------*/
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65 /*!
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66 * \brief pixFindStrokeLength()
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67 *
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68 * \param[in] pixs 1 bpp
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69 * \param[in] tab8 [optional] table for counting fg pixels; can be NULL
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70 * \param[out] plength estimated length of the strokes
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71 * \return 0 if OK, 1 on error
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72 *
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73 * <pre>
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74 * Notes:
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75 * (1) Returns half the number of fg boundary pixels.
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76 * </pre>
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77 */
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78 l_ok
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79 pixFindStrokeLength(PIX *pixs,
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80 l_int32 *tab8,
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81 l_int32 *plength)
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82 {
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83 l_int32 n;
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84 l_int32 *tab;
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85 PIX *pix1;
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86
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87 if (!plength)
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88 return ERROR_INT("&length not defined", __func__, 1);
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89 *plength = 0;
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90 if (!pixs)
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91 return ERROR_INT("pixs not defined", __func__, 1);
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92
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93 pix1 = pixExtractBoundary(pixs, 1);
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94 tab = (tab8) ? tab8 : makePixelSumTab8();
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95 pixCountPixels(pix1, &n, tab);
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96 *plength = n / 2;
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97 if (!tab8) LEPT_FREE(tab);
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98 pixDestroy(&pix1);
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99 return 0;
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100 }
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101
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parents:
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102
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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103 /*!
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104 * \brief pixFindStrokeWidth()
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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105 *
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parents:
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106 * \param[in] pixs 1 bpp
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107 * \param[in] thresh fractional count threshold relative to distance 1
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parents:
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108 * \param[in] tab8 [optional] table for counting fg pixels; can be NULL
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109 * \param[out] pwidth estimated width of the strokes
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110 * \param[out] pnahisto [optional] histo of pixel distances from bg
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Franz Glasner <fzglas.hg@dom66.de>
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111 * \return 0 if OK, 1 on error
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112 *
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Franz Glasner <fzglas.hg@dom66.de>
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113 * <pre>
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114 * Notes:
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115 * (1) This uses two methods to estimate the stroke width:
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116 * (a) half the fg boundary length
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117 * (b) a value derived from the histogram of the fg distance transform
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Franz Glasner <fzglas.hg@dom66.de>
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118 * (2) Distance is measured in 8-connected
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Franz Glasner <fzglas.hg@dom66.de>
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119 * (3) %thresh is the minimum fraction N(dist=d)/N(dist=1) of pixels
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120 * required to determine if the pixels at distance d are above
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121 * the noise. It is typically about 0.15.
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122 * </pre>
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Franz Glasner <fzglas.hg@dom66.de>
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123 */
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Franz Glasner <fzglas.hg@dom66.de>
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124 l_ok
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Franz Glasner <fzglas.hg@dom66.de>
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125 pixFindStrokeWidth(PIX *pixs,
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Franz Glasner <fzglas.hg@dom66.de>
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126 l_float32 thresh,
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Franz Glasner <fzglas.hg@dom66.de>
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127 l_int32 *tab8,
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128 l_float32 *pwidth,
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129 NUMA **pnahisto)
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130 {
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131 l_int32 i, n, count, length, first, last;
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132 l_int32 *tab;
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133 l_float32 width1, width2, ratio, extra;
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Franz Glasner <fzglas.hg@dom66.de>
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134 l_float32 *fa;
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135 NUMA *na1, *na2;
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Franz Glasner <fzglas.hg@dom66.de>
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136 PIX *pix1;
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137
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138 if (!pwidth)
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139 return ERROR_INT("&width not defined", __func__, 1);
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140 *pwidth = 0;
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141 if (!pixs)
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142 return ERROR_INT("pixs not defined", __func__, 1);
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143
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144 tab = (tab8) ? tab8 : makePixelSumTab8();
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145
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146 /* ------- Method 1: via boundary length ------- */
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147 /* The computed stroke length is a bit larger than that actual
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148 * length, because of the addition of the 'caps' at the
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149 * stroke ends. Therefore the computed width is a bit
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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150 * smaller than the average width. */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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151 pixFindStrokeLength(pixs, tab8, &length);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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152 pixCountPixels(pixs, &count, tab8);
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Franz Glasner <fzglas.hg@dom66.de>
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153 width1 = (l_float32)count / (l_float32)length;
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154
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155 /* ------- Method 2: via distance transform ------- */
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parents:
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156 /* First get the histogram of distances */
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parents:
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157 pix1 = pixDistanceFunction(pixs, 8, 8, L_BOUNDARY_BG);
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158 na1 = pixGetGrayHistogram(pix1, 1);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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159 pixDestroy(&pix1);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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160 numaGetNonzeroRange(na1, 0.1f, &first, &last);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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161 na2 = numaClipToInterval(na1, 0, last);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
162 numaWriteStderr(na2);
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parents:
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163
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parents:
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164 /* Find the bucket with the largest distance whose contents
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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165 * exceed the threshold. */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
166 fa = numaGetFArray(na2, L_NOCOPY);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
167 n = numaGetCount(na2);
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parents:
diff changeset
168 for (i = n - 1; i > 0; i--) {
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parents:
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169 ratio = fa[i] / fa[1];
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parents:
diff changeset
170 if (ratio > thresh) break;
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parents:
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171 }
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parents:
diff changeset
172 /* Let the last skipped bucket contribute to the stop bucket.
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parents:
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173 * This is the 'extra' term below. The result may be a slight
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parents:
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174 * over-correction, so the computed width may be a bit larger
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
175 * than the average width. */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
176 extra = (i < n - 1) ? fa[i + 1] / fa[1] : 0;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
177 width2 = 2.0f * (i - 1.0f + ratio + extra);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
178 lept_stderr("width1 = %5.2f, width2 = %5.2f\n", width1, width2);
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parents:
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179
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parents:
diff changeset
180 /* Average the two results */
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parents:
diff changeset
181 *pwidth = (width1 + width2) / 2.0f;
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parents:
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182
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
183 if (!tab8) LEPT_FREE(tab);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
184 numaDestroy(&na1);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
185 if (pnahisto)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
186 *pnahisto = na2;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
187 else
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
188 numaDestroy(&na2);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
189 return 0;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
190 }
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parents:
diff changeset
191
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parents:
diff changeset
192
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
193 /*!
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
194 * \brief pixaFindStrokeWidth()
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
195 *
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
196 * \param[in] pixa of 1 bpp images
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
197 * \param[in] thresh fractional count threshold relative to distance 1
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
198 * \param[in] tab8 [optional] table for counting fg pixels; can be NULL
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
199 * \param[in] debug 1 for debug output; 0 to skip
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
200 * \return na array of stroke widths for each pix in %pixa; NULL on error
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parents:
diff changeset
201 *
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
202 * <pre>
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
203 * Notes:
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parents:
diff changeset
204 * (1) See pixFindStrokeWidth() for details.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
205 * </pre>
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
206 */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
207 NUMA *
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
208 pixaFindStrokeWidth(PIXA *pixa,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
209 l_float32 thresh,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
210 l_int32 *tab8,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
211 l_int32 debug)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
212 {
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
213 l_int32 i, n, same, maxd;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
214 l_int32 *tab;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
215 l_float32 width;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
216 NUMA *na;
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diff changeset
217 PIX *pix;
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parents:
diff changeset
218
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
219 if (!pixa)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
220 return (NUMA *)ERROR_PTR("pixa not defined", __func__, NULL);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
221 pixaVerifyDepth(pixa, &same, &maxd);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
222 if (maxd > 1)
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parents:
diff changeset
223 return (NUMA *)ERROR_PTR("pix not all 1 bpp", __func__, NULL);
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parents:
diff changeset
224
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
225 tab = (tab8) ? tab8 : makePixelSumTab8();
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parents:
diff changeset
226
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
227 n = pixaGetCount(pixa);
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parents:
diff changeset
228 na = numaCreate(n);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
229 for (i = 0; i < n; i++) {
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diff changeset
230 pix = pixaGetPix(pixa, i, L_CLONE);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
231 pixFindStrokeWidth(pix, thresh, tab8, &width, NULL);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
232 numaAddNumber(na, width);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
233 pixDestroy(&pix);
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parents:
diff changeset
234 }
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parents:
diff changeset
235
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
236 if (!tab8) LEPT_FREE(tab);
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diff changeset
237 return na;
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parents:
diff changeset
238 }
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parents:
diff changeset
239
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
240
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
241 /*-----------------------------------------------------------------*
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parents:
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242 * Change stroke width *
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
243 *-----------------------------------------------------------------*/
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
244 /*!
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
245 * \brief pixaModifyStrokeWidth()
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parents:
diff changeset
246 *
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parents:
diff changeset
247 * \param[in] pixas of 1 bpp pix
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parents:
diff changeset
248 * \param[out] targetw desired width for strokes in each pix
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parents:
diff changeset
249 * \return pixa with modified stroke widths, or NULL on error
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
250 */
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
251 PIXA *
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parents:
diff changeset
252 pixaModifyStrokeWidth(PIXA *pixas,
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parents:
diff changeset
253 l_float32 targetw)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
254 {
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
255 l_int32 i, n, same, maxd;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
256 l_float32 width;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
257 NUMA *na;
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parents:
diff changeset
258 PIX *pix1, *pix2;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
259 PIXA *pixad;
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parents:
diff changeset
260
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
261 if (!pixas)
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
262 return (PIXA *)ERROR_PTR("pixas not defined", __func__, NULL);
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
263 if (targetw < 1)
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 return (PIXA *)ERROR_PTR("target width < 1", __func__, NULL);
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
265 pixaVerifyDepth(pixas, &same, &maxd);
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
266 if (maxd > 1)
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
267 return (PIXA *)ERROR_PTR("pix not all 1 bpp", __func__, NULL);
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
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 na = pixaFindStrokeWidth(pixas, 0.1f, NULL, 0);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
270 n = pixaGetCount(pixas);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
271 pixad = pixaCreate(n);
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
272 for (i = 0; i < n; i++) {
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
273 pix1 = pixaGetPix(pixas, i, L_CLONE);
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
274 numaGetFValue(na, i, &width);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
275 pix2 = pixModifyStrokeWidth(pix1, width, targetw);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
276 pixaAddPix(pixad, pix2, L_INSERT);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
277 pixDestroy(&pix1);
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
278 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
279
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
280 numaDestroy(&na);
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
281 return pixad;
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
282 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
283
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
284
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
285 /*!
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
286 * \brief pixModifyStrokeWidth()
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
287 *
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
288 * \param[in] pixs of 1 bpp pix
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
289 * \param[in] width measured average stroke width
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
290 * \param[in] targetw desired stroke width
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
291 * \return pix with modified stroke width, or NULL on error
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
292 */
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
293 PIX *
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
294 pixModifyStrokeWidth(PIX *pixs,
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
295 l_float32 width,
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
296 l_float32 targetw)
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
297 {
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
298 char buf[32];
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
299 l_int32 diff, size;
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
300
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
301 if (!pixs || (pixGetDepth(pixs) != 1))
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
302 return (PIX *)ERROR_PTR("pixs undefined or not 1 bpp", __func__, NULL);
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
303 if (targetw < 1)
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
304 return (PIX *)ERROR_PTR("target width < 1", __func__, NULL);
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
305
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
306 diff = lept_roundftoi(targetw - width);
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
307 if (diff == 0) return pixCopy(NULL, pixs);
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
308
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
309 size = L_ABS(diff) + 1;
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
310 if (diff < 0) /* erode */
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
311 snprintf(buf, sizeof(buf), "e%d.%d", size, size);
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
312 else /* diff > 0; dilate */
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
313 snprintf(buf, sizeof(buf), "d%d.%d", size, size);
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
314 return pixMorphSequence(pixs, buf, 0);
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
315 }
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
316
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
317
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
318 /*!
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
319 * \brief pixaSetStrokeWidth()
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
320 *
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
321 * \param[in] pixas of 1 bpp pix
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
322 * \param[in] width set stroke width to this value, in [1 ... 100].
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
323 * \param[in] thinfirst 1 to thin all pix to a skeleton first; 0 to skip
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
324 * \param[in] connectivity 4 or 8, to be used if %thinfirst == 1
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
325 * \return pixa with all stroke widths being %width, or NULL on error
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
326 *
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
327 * <pre>
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
328 * Notes:
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
329 * (1) If %thinfirst == 1, thin to a skeleton using the specified
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
330 * %connectivity. Use %thinfirst == 0 if all pix in pixas
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
331 * have already been thinned as far as possible.
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
332 * (2) The image is dilated to the required %width. This dilation
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
333 * is not connectivity preserving, so this is typically
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
334 * used in a situation where merging of c.c. in the individual
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
335 * pix is not a problem; e.g., where each pix is a single c.c.
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
336 * </pre>
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
337 */
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
338 PIXA *
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
339 pixaSetStrokeWidth(PIXA *pixas,
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
340 l_int32 width,
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
341 l_int32 thinfirst,
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
342 l_int32 connectivity)
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
343 {
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
344 l_int32 i, n, maxd, same;
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
345 PIX *pix1, *pix2;
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
346 PIXA *pixad;
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
347
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
348 if (!pixas)
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
349 return (PIXA *)ERROR_PTR("pixas not defined", __func__, NULL);
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
350 if (width < 1 || width > 100)
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
351 return (PIXA *)ERROR_PTR("width not in [1 ... 100]", __func__, NULL);
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
352 if (connectivity != 4 && connectivity != 8)
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
353 return (PIXA *)ERROR_PTR("connectivity not 4 or 8", __func__, NULL);
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
354 pixaVerifyDepth(pixas, &same, &maxd);
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
355 if (maxd > 1)
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
356 return (PIXA *)ERROR_PTR("pix are not all 1 bpp", __func__, NULL);
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
357
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
358 n = pixaGetCount(pixas);
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
359 pixad = pixaCreate(n);
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
360 for (i = 0; i < n; i++) {
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
361 pix1 = pixaGetPix(pixas, i, L_CLONE);
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
362 pix2 = pixSetStrokeWidth(pix1, width, thinfirst, connectivity);
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
363 pixaAddPix(pixad, pix2, L_INSERT);
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
364 pixDestroy(&pix1);
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
365 }
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
366
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
367 return pixad;
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
368 }
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
369
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
370
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
371 /*!
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
372 * \brief pixSetStrokeWidth()
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
373 *
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
374 * \param[in] pixs 1 bpp
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
375 * \param[in] width set stroke width to this value, in [1 ... 100].
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
376 * \param[in] thinfirst 1 to thin all pix to a skeleton first; 0 to skip
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
377 * \param[in] connectivity 4 or 8, to be used if %thinfirst == 1
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
378 * \return pixd with stroke width set to %width, or NULL on error
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
379 *
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
380 * <pre>
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
381 * Notes:
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
382 * (1) See notes in pixaSetStrokeWidth().
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
383 * (2) A white border of sufficient width to avoid boundary
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
384 * artifacts in the thickening step is added before thinning.
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
385 * (3) %connectivity == 8 usually gives a slightly smoother result.
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
386 * </pre>
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
387 */
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
388 PIX *
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
389 pixSetStrokeWidth(PIX *pixs,
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
390 l_int32 width,
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
391 l_int32 thinfirst,
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
392 l_int32 connectivity)
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
393 {
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
394 char buf[16];
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
395 l_int32 border;
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
396 PIX *pix1, *pix2, *pixd;
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
397
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
398 if (!pixs || (pixGetDepth(pixs) != 1))
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
399 return (PIX *)ERROR_PTR("pixs undefined or not 1 bpp", __func__, NULL);
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
400 if (width < 1 || width > 100)
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
401 return (PIX *)ERROR_PTR("width not in [1 ... 100]", __func__, NULL);
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
402 if (connectivity != 4 && connectivity != 8)
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
403 return (PIX *)ERROR_PTR("connectivity not 4 or 8", __func__, NULL);
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
404
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
405 if (!thinfirst && width == 1) /* nothing to do */
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
406 return pixCopy(NULL, pixs);
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
407
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
408 /* Add a white border */
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
409 border = width / 2;
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
410 pix1 = pixAddBorder(pixs, border, 0);
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
411
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
412 /* Thin to a skeleton */
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
413 if (thinfirst)
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
414 pix2 = pixThinConnected(pix1, L_THIN_FG, connectivity, 0);
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
415 else
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
416 pix2 = pixClone(pix1);
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
417 pixDestroy(&pix1);
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
418
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
419 /* Dilate */
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
420 snprintf(buf, sizeof(buf), "D%d.%d", width, width);
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
421 pixd = pixMorphSequence(pix2, buf, 0);
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
422 pixCopyText(pixd, pixs);
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
423 pixDestroy(&pix2);
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
424 return pixd;
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
425 }