Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/core/src/Point.h @ 38:8934ac156ef5

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Allow to build with the PyPI package "clang" instead of "libclang". 1. It seems to be maintained. 2. In the FreeBSD base system there is no pre-built libclang.so. If you need this library you have to install llvm from ports additionally. 2. On FreeBSD there is no pre-built wheel "libclang" with a packaged libclang.so.
author Franz Glasner <fzglas.hg@dom66.de>
date Tue, 23 Sep 2025 10:27:15 +0200
parents b50eed0cc0ef
children
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1 /*
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2 * Copyright 2020 Axel Waggershauser
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3 */
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4 // SPDX-License-Identifier: Apache-2.0
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6 #pragma once
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8 #include <algorithm>
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9 #include <cmath>
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11 namespace ZXing {
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13 template <typename T>
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14 struct PointT
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15 {
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16 using value_t = T;
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17 T x = 0, y = 0;
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19 constexpr PointT() = default;
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20 constexpr PointT(T x, T y) : x(x), y(y) {}
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22 template <typename U>
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23 constexpr explicit PointT(const PointT<U>& p) : x(static_cast<T>(p.x)), y(static_cast<T>(p.y))
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24 {}
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26 template <typename U>
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27 PointT& operator+=(const PointT<U>& b)
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28 {
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29 x += b.x;
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30 y += b.y;
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31 return *this;
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32 }
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33 };
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35 template <typename T>
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36 bool operator==(const PointT<T>& a, const PointT<T>& b)
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37 {
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38 return a.x == b.x && a.y == b.y;
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39 }
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41 template <typename T>
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42 bool operator!=(const PointT<T>& a, const PointT<T>& b)
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43 {
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44 return !(a == b);
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45 }
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47 template <typename T>
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48 auto operator-(const PointT<T>& a) -> PointT<T>
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49 {
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50 return {-a.x, -a.y};
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51 }
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53 template <typename T, typename U>
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54 auto operator+(const PointT<T>& a, const PointT<U>& b) -> PointT<decltype(a.x + b.x)>
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55 {
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56 return {a.x + b.x, a.y + b.y};
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57 }
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59 template <typename T, typename U>
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60 auto operator-(const PointT<T>& a, const PointT<U>& b) -> PointT<decltype(a.x - b.x)>
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61 {
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62 return {a.x - b.x, a.y - b.y};
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63 }
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65 template <typename T, typename U>
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66 auto operator*(const PointT<T>& a, const PointT<U>& b) -> PointT<decltype(a.x * b.x)>
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67 {
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68 return {a.x * b.x, a.y * b.y};
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69 }
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71 template <typename T, typename U>
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72 PointT<T> operator*(U s, const PointT<T>& a)
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73 {
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74 return {s * a.x, s * a.y};
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75 }
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77 template <typename T, typename U>
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78 PointT<T> operator/(const PointT<T>& a, U d)
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79 {
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80 return {a.x / d, a.y / d};
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81 }
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83 template <typename T, typename U>
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84 auto dot(const PointT<T>& a, const PointT<U>& b) -> decltype (a.x * b.x)
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85 {
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86 return a.x * b.x + a.y * b.y;
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87 }
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89 template <typename T>
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90 auto cross(PointT<T> a, PointT<T> b) -> decltype(a.x * b.x)
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91 {
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92 return a.x * b.y - b.x * a.y;
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93 }
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95 /// L1 norm
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96 template <typename T>
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97 T sumAbsComponent(PointT<T> p)
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98 {
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99 return std::abs(p.x) + std::abs(p.y);
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100 }
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101
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102 /// L2 norm
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103 template <typename T>
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104 auto length(PointT<T> p) -> decltype(std::sqrt(dot(p, p)))
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105 {
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106 return std::sqrt(dot(p, p));
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107 }
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108
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109 /// L-inf norm
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110 template <typename T>
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111 T maxAbsComponent(PointT<T> p)
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112 {
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113 return std::max(std::abs(p.x), std::abs(p.y));
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114 }
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115
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116 template <typename T>
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117 auto distance(PointT<T> a, PointT<T> b) -> decltype(length(a - b))
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118 {
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119 return length(a - b);
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120 }
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121
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122 using PointI = PointT<int>;
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123 using PointF = PointT<double>;
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124
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125 /// Calculate a floating point pixel coordinate representing the 'center' of the pixel.
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126 /// This is sort of the inverse operation of the PointI(PointF) conversion constructor.
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127 /// See also the documentation of the GridSampler API.
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128 inline PointF centered(PointI p)
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129 {
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130 return p + PointF(0.5f, 0.5f);
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131 }
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132
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133 inline PointF centered(PointF p)
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134 {
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135 return {std::floor(p.x) + 0.5f, std::floor(p.y) + 0.5f};
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136 }
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137
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138 template <typename T>
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139 PointF normalized(PointT<T> d)
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140 {
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141 return PointF(d) / length(PointF(d));
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142 }
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143
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144 template <typename T>
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145 PointT<T> bresenhamDirection(PointT<T> d)
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146 {
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147 return d / maxAbsComponent(d);
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148 }
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149
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150 template <typename T>
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151 PointT<T> mainDirection(PointT<T> d)
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152 {
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153 return std::abs(d.x) > std::abs(d.y) ? PointT<T>(d.x, 0) : PointT<T>(0, d.y);
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154 }
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155
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156
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157 } // ZXing
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158