Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/leptonica/src/fhmtgen.1.c @ 46:7ee69f120f19 default tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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2
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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 * Top-level fast hit-miss transform with auto-generated sels
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29 *
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30 * PIX *pixHMTDwa_1()
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31 * PIX *pixFHMTGen_1()
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32 */
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33
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34 #include <string.h>
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35 #include "allheaders.h"
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36
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37 PIX *pixHMTDwa_1(PIX *pixd, PIX *pixs, const char *selname);
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38 PIX *pixFHMTGen_1(PIX *pixd, PIX *pixs, const char *selname);
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39 l_int32 fhmtgen_low_1(l_uint32 *datad, l_int32 w,
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40 l_int32 h, l_int32 wpld,
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41 l_uint32 *datas, l_int32 wpls,
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42 l_int32 index);
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43
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44 static l_int32 NUM_SELS_GENERATED = 10;
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45 static char SEL_NAMES[][80] = {
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46 "sel_3hm",
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47 "sel_3de",
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48 "sel_3ue",
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49 "sel_3re",
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50 "sel_3le",
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51 "sel_sl1",
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52 "sel_ulc",
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53 "sel_urc",
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54 "sel_llc",
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55 "sel_lrc"};
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56
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57 /*!
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58 * \brief pixHMTDwa_1()
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59 *
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60 * \param[in] pixd usual 3 choices: null, == pixs, != pixs
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61 * \param[in] pixs 1 bpp
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62 * \param[in] sel name
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63 * \return pixd
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64 *
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65 * <pre>
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66 * Notes:
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67 * (1) This simply adds a 32 pixel border, calls the appropriate
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68 * pixFHMTGen_*(), and removes the border.
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69 * See notes below for that function.
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70 * </pre>
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71 */
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72 PIX *
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73 pixHMTDwa_1(PIX *pixd,
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74 PIX *pixs,
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75 const char *selname)
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76 {
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77 PIX *pixt1, *pixt2, *pixt3;
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78
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79 if (!pixs)
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80 return (PIX *)ERROR_PTR("pixs not defined", __func__, pixd);
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81 if (pixGetDepth(pixs) != 1)
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82 return (PIX *)ERROR_PTR("pixs must be 1 bpp", __func__, pixd);
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83
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84 pixt1 = pixAddBorder(pixs, 32, 0);
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85 pixt2 = pixFHMTGen_1(NULL, pixt1, selname);
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86 pixt3 = pixRemoveBorder(pixt2, 32);
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87 pixDestroy(&pixt1);
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88 pixDestroy(&pixt2);
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89
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90 if (!pixd)
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91 return pixt3;
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92
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93 pixCopy(pixd, pixt3);
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94 pixDestroy(&pixt3);
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95 return pixd;
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96 }
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97
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98
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99 /*!
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100 * \brief pixFHMTGen_1()
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101 *
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102 * \param[in] pixd usual 3 choices: null, == pixs, != pixs
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103 * \param[in] pixs 1 bpp
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104 * \param[in] sel name
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105 * \return pixd
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106 *
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107 * <pre>
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108 * Notes:
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109 * (1) This is a dwa implementation of the hit-miss transform
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110 * on pixs by the sel.
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111 * (2) The sel must be limited in size to not more than 31 pixels
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112 * about the origin. It must have at least one hit, and it
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113 * can have any number of misses.
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114 * (3) This handles all required setting of the border pixels
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115 * before erosion and dilation.
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116 * </pre>
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117 */
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118 PIX *
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119 pixFHMTGen_1(PIX *pixd,
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120 PIX *pixs,
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121 const char *selname)
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122 {
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123 l_int32 i, index, found, w, h, wpls, wpld;
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124 l_uint32 *datad, *datas, *datat;
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125 PIX *pixt;
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126
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127 if (!pixs)
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128 return (PIX *)ERROR_PTR("pixs not defined", __func__, pixd);
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129 if (pixGetDepth(pixs) != 1)
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130 return (PIX *)ERROR_PTR("pixs must be 1 bpp", __func__, pixd);
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131
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132 found = FALSE;
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133 for (i = 0; i < NUM_SELS_GENERATED; i++) {
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134 if (strcmp(selname, SEL_NAMES[i]) == 0) {
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135 found = TRUE;
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136 index = i;
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137 break;
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138 }
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139 }
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140 if (found == FALSE)
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141 return (PIX *)ERROR_PTR("sel index not found", __func__, pixd);
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142
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143 if (!pixd) {
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144 if ((pixd = pixCreateTemplate(pixs)) == NULL)
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145 return (PIX *)ERROR_PTR("pixd not made", __func__, NULL);
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146 }
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147 else /* for in-place or pre-allocated */
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148 pixResizeImageData(pixd, pixs);
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149 wpls = pixGetWpl(pixs);
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150 wpld = pixGetWpl(pixd);
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151
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152 /* The images must be surrounded with 32 additional border
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153 * pixels, that we'll read from. We fabricate a "proper"
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154 * image as the subimage within the border, having the
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155 * following parameters: */
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156 w = pixGetWidth(pixs) - 64;
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157 h = pixGetHeight(pixs) - 64;
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158 datas = pixGetData(pixs) + 32 * wpls + 1;
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159 datad = pixGetData(pixd) + 32 * wpld + 1;
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160
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161 if (pixd == pixs) { /* need temp image if in-place */
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162 if ((pixt = pixCopy(NULL, pixs)) == NULL)
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163 return (PIX *)ERROR_PTR("pixt not made", __func__, pixd);
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164 datat = pixGetData(pixt) + 32 * wpls + 1;
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165 fhmtgen_low_1(datad, w, h, wpld, datat, wpls, index);
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166 pixDestroy(&pixt);
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167 }
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168 else { /* not in-place */
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169 fhmtgen_low_1(datad, w, h, wpld, datas, wpls, index);
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170 }
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171
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172 return pixd;
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173 }