Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/textord/edgloop.cpp @ 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:
rev   line source
2
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1 /**********************************************************************
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2 * File: edgloop.cpp (Formerly edgeloop.c)
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3 * Description: Functions to clean up an outline before approximation.
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4 * Author: Ray Smith
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5 *
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6 * (C) Copyright 1991, Hewlett-Packard Ltd.
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7 ** Licensed under the Apache License, Version 2.0 (the "License");
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8 ** you may not use this file except in compliance with the License.
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9 ** You may obtain a copy of the License at
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10 ** http://www.apache.org/licenses/LICENSE-2.0
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11 ** Unless required by applicable law or agreed to in writing, software
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12 ** distributed under the License is distributed on an "AS IS" BASIS,
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13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 ** See the License for the specific language governing permissions and
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15 ** limitations under the License.
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16 *
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17 **********************************************************************/
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18
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19 // Include automatically generated configuration file if running autoconf.
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20 #ifdef HAVE_CONFIG_H
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21 # include "config_auto.h"
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22 #endif
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23
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24 #include "scanedg.h"
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25
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26 #include "edgloop.h"
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27
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28 namespace tesseract {
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29
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30 #define MINEDGELENGTH 8 // min decent length
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31
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32 /**********************************************************************
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33 * complete_edge
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34 *
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35 * Complete the edge by cleaning it up.
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36 **********************************************************************/
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37
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38 void complete_edge(CRACKEDGE *start, // start of loop
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39 C_OUTLINE_IT *outline_it) {
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40 ScrollView::Color colour; // colour to draw in
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41 int16_t looplength; // steps in loop
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42 ICOORD botleft; // bounding box
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43 ICOORD topright;
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44 C_OUTLINE *outline; // new outline
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45
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46 // check length etc.
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47 colour = check_path_legal(start);
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48
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49 if (colour == ScrollView::RED || colour == ScrollView::BLUE) {
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50 looplength = loop_bounding_box(start, botleft, topright);
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51 outline = new C_OUTLINE(start, botleft, topright, looplength);
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52 // add to list
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53 outline_it->add_after_then_move(outline);
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54 }
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55 }
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56
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57 /**********************************************************************
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58 * check_path_legal
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59 *
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60 * Check that the outline is legal for length and for chaincode sum.
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61 * The return value is RED for a normal black-inside outline,
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62 * BLUE for a white-inside outline, MAGENTA if it is too short,
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63 * YELLOW if it is too long, and GREEN if it is illegal.
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64 * These colours are used to draw the raw outline.
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65 **********************************************************************/
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66
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67 ScrollView::Color check_path_legal( // certify outline
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68 CRACKEDGE *start // start of loop
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69 ) {
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70 int lastchain; // last chain code
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71 int chaindiff; // chain code diff
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72 int32_t length; // length of loop
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73 int32_t chainsum; // sum of chain diffs
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74 CRACKEDGE *edgept; // current point
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75 constexpr ERRCODE ED_ILLEGAL_SUM("Illegal sum of chain codes");
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76
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77 length = 0;
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78 chainsum = 0; // sum of chain codes
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79 edgept = start;
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80 lastchain = edgept->prev->stepdir; // previous chain code
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81 do {
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82 length++;
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83 if (edgept->stepdir != lastchain) {
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84 // chain code difference
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85 chaindiff = edgept->stepdir - lastchain;
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86 if (chaindiff > 2) {
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87 chaindiff -= 4;
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88 } else if (chaindiff < -2) {
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89 chaindiff += 4;
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90 }
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91 chainsum += chaindiff; // sum differences
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92 lastchain = edgept->stepdir;
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93 }
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94 edgept = edgept->next;
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95 } while (edgept != start && length < C_OUTLINE::kMaxOutlineLength);
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96
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97 if ((chainsum != 4 && chainsum != -4) || edgept != start || length < MINEDGELENGTH) {
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98 if (edgept != start) {
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99 return ScrollView::YELLOW;
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100 } else if (length < MINEDGELENGTH) {
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101 return ScrollView::MAGENTA;
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102 } else {
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103 ED_ILLEGAL_SUM.error("check_path_legal", TESSLOG, "chainsum=%d", chainsum);
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104 return ScrollView::GREEN;
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105 }
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106 }
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107 // colour on inside
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108 return chainsum < 0 ? ScrollView::BLUE : ScrollView::RED;
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109 }
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110
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111 /**********************************************************************
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112 * loop_bounding_box
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113 *
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114 * Find the bounding box of the edge loop.
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115 **********************************************************************/
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116
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117 int16_t loop_bounding_box( // get bounding box
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118 CRACKEDGE *&start, // edge loop
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119 ICOORD &botleft, // bounding box
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120 ICOORD &topright) {
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121 int16_t length; // length of loop
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122 int16_t leftmost; // on top row
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123 CRACKEDGE *edgept; // current point
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124 CRACKEDGE *realstart; // topleft start
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125
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126 edgept = start;
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127 realstart = start;
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128 botleft = topright = ICOORD(edgept->pos.x(), edgept->pos.y());
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129 leftmost = edgept->pos.x();
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130 length = 0; // coutn length
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131 do {
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132 edgept = edgept->next;
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133 if (edgept->pos.x() < botleft.x()) {
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134 // get bounding box
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135 botleft.set_x(edgept->pos.x());
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136 } else if (edgept->pos.x() > topright.x()) {
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137 topright.set_x(edgept->pos.x());
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138 }
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139 if (edgept->pos.y() < botleft.y()) {
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parents:
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140 // get bounding box
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141 botleft.set_y(edgept->pos.y());
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142 } else if (edgept->pos.y() > topright.y()) {
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parents:
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143 realstart = edgept;
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144 leftmost = edgept->pos.x();
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145 topright.set_y(edgept->pos.y());
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parents:
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146 } else if (edgept->pos.y() == topright.y() && edgept->pos.x() < leftmost) {
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147 // leftmost on line
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148 leftmost = edgept->pos.x();
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parents:
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149 realstart = edgept;
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150 }
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parents:
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151 length++; // count elements
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parents:
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152 } while (edgept != start);
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diff changeset
153 start = realstart; // shift it to topleft
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154 return length;
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155 }
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parents:
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156
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157 } // namespace tesseract