Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccstruct/points.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: points.cpp (Formerly coords.c)
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3 * Description: Member functions for coordinate classes.
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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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19 #define _USE_MATH_DEFINES // for M_PI
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21 #include "points.h"
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23 #include "helpers.h"
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24 #include "serialis.h"
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26 #include <algorithm>
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27 #include <cmath> // for M_PI
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28 #include <cstdlib>
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30 namespace tesseract {
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32 bool FCOORD::normalise() { // Convert to unit vec
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33 float len = length();
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35 if (len < 0.0000000001) {
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36 return false;
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37 }
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38 xcoord /= len;
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39 ycoord /= len;
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40 return true;
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41 }
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43 bool ICOORD::DeSerialize(TFile *f) {
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44 return f->DeSerialize(&xcoord) && f->DeSerialize(&ycoord);
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45 }
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47 bool ICOORD::Serialize(TFile *f) const {
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48 return f->Serialize(&xcoord) && f->Serialize(&ycoord);
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49 }
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51 // Set from the given x,y, shrinking the vector to fit if needed.
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52 void ICOORD::set_with_shrink(int x, int y) {
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53 // Fit the vector into an ICOORD, which is 16 bit.
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54 int factor = 1;
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55 int max_extent = std::max(abs(x), abs(y));
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56 if (max_extent > INT16_MAX) {
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57 factor = max_extent / INT16_MAX + 1;
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58 }
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59 xcoord = x / factor;
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60 ycoord = y / factor;
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61 }
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63 // The fortran/basic sgn function returns -1, 0, 1 if x < 0, x == 0, x > 0
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64 // respectively.
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65 static int sign(int x) {
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66 if (x < 0) {
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67 return -1;
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68 } else {
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69 return x > 0 ? 1 : 0;
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70 }
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71 }
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73 // Writes to the given file. Returns false in case of error.
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74 bool ICOORD::Serialize(FILE *fp) const {
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75 return tesseract::Serialize(fp, &xcoord) && tesseract::Serialize(fp, &ycoord);
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76 }
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77 // Reads from the given file. Returns false in case of error.
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78 // If swap is true, assumes a big/little-endian swap is needed.
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79 bool ICOORD::DeSerialize(bool swap, FILE *fp) {
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80 if (!tesseract::DeSerialize(fp, &xcoord)) {
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81 return false;
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82 }
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83 if (!tesseract::DeSerialize(fp, &ycoord)) {
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84 return false;
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85 }
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86 if (swap) {
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87 ReverseN(&xcoord, sizeof(xcoord));
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88 ReverseN(&ycoord, sizeof(ycoord));
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89 }
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90 return true;
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91 }
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92
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93 // Setup for iterating over the pixels in a vector by the well-known
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94 // Bresenham rendering algorithm.
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95 // Starting with major/2 in the accumulator, on each step add major_step,
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96 // and then add minor to the accumulator. When the accumulator >= major
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97 // subtract major and step a minor step.
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98
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99 void ICOORD::setup_render(ICOORD *major_step, ICOORD *minor_step, int *major, int *minor) const {
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100 int abs_x = abs(xcoord);
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101 int abs_y = abs(ycoord);
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102 if (abs_x >= abs_y) {
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103 // X-direction is major.
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104 major_step->xcoord = sign(xcoord);
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105 major_step->ycoord = 0;
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106 minor_step->xcoord = 0;
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107 minor_step->ycoord = sign(ycoord);
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108 *major = abs_x;
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109 *minor = abs_y;
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110 } else {
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111 // Y-direction is major.
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112 major_step->xcoord = 0;
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113 major_step->ycoord = sign(ycoord);
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114 minor_step->xcoord = sign(xcoord);
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115 minor_step->ycoord = 0;
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116 *major = abs_y;
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117 *minor = abs_x;
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118 }
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119 }
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120
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121 // Returns the standard feature direction corresponding to this.
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122 // See binary_angle_plus_pi below for a description of the direction.
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123 uint8_t FCOORD::to_direction() const {
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124 return binary_angle_plus_pi(angle());
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125 }
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126 // Sets this with a unit vector in the given standard feature direction.
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127 void FCOORD::from_direction(uint8_t direction) {
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128 double radians = angle_from_direction(direction);
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129 xcoord = cos(radians);
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130 ycoord = sin(radians);
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131 }
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132
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133 // Converts an angle in radians (from ICOORD::angle or FCOORD::angle) to a
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134 // standard feature direction as an unsigned angle in 256ths of a circle
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135 // measured anticlockwise from (-1, 0).
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136 uint8_t FCOORD::binary_angle_plus_pi(double radians) {
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137 return Modulo(IntCastRounded((radians + M_PI) * 128.0 / M_PI), 256);
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138 }
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139 // Inverse of binary_angle_plus_pi returns an angle in radians for the
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140 // given standard feature direction.
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141 double FCOORD::angle_from_direction(uint8_t direction) {
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142 return direction * M_PI / 128.0 - M_PI;
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143 }
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144
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145 // Returns the point on the given line nearest to this, ie the point such
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146 // that the vector point->this is perpendicular to the line.
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147 // The line is defined as a line_point and a dir_vector for its direction.
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148 FCOORD FCOORD::nearest_pt_on_line(const FCOORD &line_point, const FCOORD &dir_vector) const {
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149 FCOORD point_vector(*this - line_point);
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150 // The dot product (%) is |dir_vector||point_vector|cos theta, so dividing by
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151 // the square of the length of dir_vector gives us the fraction of dir_vector
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152 // to add to line1 to get the appropriate point, so
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153 // result = line1 + lambda dir_vector.
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154 double lambda = point_vector % dir_vector / dir_vector.sqlength();
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155 return line_point + (dir_vector * lambda);
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156 }
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157
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158 } // namespace tesseract