Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/core/src/ImageView.h @ 21:2f43e400f144

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Provide an "all" target to build both the sdist and the wheel
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 10:28:53 +0200
parents b50eed0cc0ef
children
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1 /*
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2 * Copyright 2019 Axel Waggershauser
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3 */
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4 // SPDX-License-Identifier: Apache-2.0
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5
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6 #pragma once
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7
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8 #include <algorithm>
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9 #include <cstdint>
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10 #include <cstdio>
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11 #include <memory>
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12 #include <stdexcept>
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14 namespace ZXing {
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16 enum class ImageFormat : uint32_t
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17 {
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18 None = 0,
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19 Lum = 0x01000000,
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20 LumA = 0x02000000,
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21 RGB = 0x03000102,
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22 BGR = 0x03020100,
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23 RGBA = 0x04000102,
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24 ARGB = 0x04010203,
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25 BGRA = 0x04020100,
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26 ABGR = 0x04030201,
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27 RGBX [[deprecated("use RGBA")]] = RGBA,
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28 XRGB [[deprecated("use ARGB")]] = ARGB,
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29 BGRX [[deprecated("use BGRA")]] = BGRA,
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30 XBGR [[deprecated("use ABGR")]] = ABGR,
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31 };
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33 constexpr inline int PixStride(ImageFormat format) { return (static_cast<uint32_t>(format) >> 3*8) & 0xFF; }
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34 constexpr inline int RedIndex(ImageFormat format) { return (static_cast<uint32_t>(format) >> 2*8) & 0xFF; }
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35 constexpr inline int GreenIndex(ImageFormat format) { return (static_cast<uint32_t>(format) >> 1*8) & 0xFF; }
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36 constexpr inline int BlueIndex(ImageFormat format) { return (static_cast<uint32_t>(format) >> 0*8) & 0xFF; }
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38 constexpr inline uint8_t RGBToLum(unsigned r, unsigned g, unsigned b)
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39 {
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40 // .299R + 0.587G + 0.114B (YUV/YIQ for PAL and NTSC),
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41 // (306*R) >> 10 is approximately equal to R*0.299, and so on.
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42 // 0x200 >> 10 is 0.5, it implements rounding.
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43 return static_cast<uint8_t>((306 * r + 601 * g + 117 * b + 0x200) >> 10);
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44 }
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45
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46 /**
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47 * Simple class that stores a non-owning const pointer to image data plus layout and format information.
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48 */
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49 class ImageView
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50 {
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51 protected:
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52 const uint8_t* _data = nullptr;
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53 ImageFormat _format = ImageFormat::None;
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54 int _width = 0, _height = 0, _pixStride = 0, _rowStride = 0;
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55
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56 public:
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57 /** ImageView default constructor creates a 'null' image view
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58 */
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59 ImageView() = default;
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60
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61 /**
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62 * ImageView constructor
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63 *
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64 * @param data pointer to image buffer
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65 * @param width image width in pixels
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66 * @param height image height in pixels
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67 * @param format image/pixel format
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68 * @param rowStride optional row stride in bytes, default is width * pixStride
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69 * @param pixStride optional pixel stride in bytes, default is calculated from format
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70 */
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71 ImageView(const uint8_t* data, int width, int height, ImageFormat format, int rowStride = 0, int pixStride = 0)
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72 : _data(data),
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73 _format(format),
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74 _width(width),
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75 _height(height),
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76 _pixStride(pixStride ? pixStride : PixStride(format)),
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77 _rowStride(rowStride ? rowStride : width * _pixStride)
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78 {
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79 // TODO: [[deprecated]] this check is to prevent exising code from suddenly throwing, remove in 3.0
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80 if (_data == nullptr && _width == 0 && _height == 0 && rowStride == 0 && pixStride == 0) {
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81 fprintf(stderr, "zxing-cpp deprecation warning: ImageView(nullptr, ...) will throw in the future, use ImageView()\n");
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82 return;
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83 }
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84
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85 if (_data == nullptr)
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86 throw std::invalid_argument("Can not construct an ImageView from a NULL pointer");
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87
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88 if (_width <= 0 || _height <= 0)
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89 throw std::invalid_argument("Neither width nor height of ImageView can be less or equal to 0");
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90 }
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91
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92 /**
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93 * ImageView constructor with bounds checking
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94 */
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95 ImageView(const uint8_t* data, int size, int width, int height, ImageFormat format, int rowStride = 0, int pixStride = 0)
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96 : ImageView(data, width, height, format, rowStride, pixStride)
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97 {
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98 if (_rowStride < 0 || _pixStride < 0 || size < _height * _rowStride)
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99 throw std::invalid_argument("ImageView parameters are inconsistent (out of bounds)");
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100 }
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101
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102 int width() const { return _width; }
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103 int height() const { return _height; }
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104 int pixStride() const { return _pixStride; }
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105 int rowStride() const { return _rowStride; }
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106 ImageFormat format() const { return _format; }
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107
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108 const uint8_t* data() const { return _data; }
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109 const uint8_t* data(int x, int y) const { return _data + y * _rowStride + x * _pixStride; }
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110
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111 ImageView cropped(int left, int top, int width, int height) const
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112 {
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113 left = std::clamp(left, 0, _width - 1);
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114 top = std::clamp(top, 0, _height - 1);
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115 width = width <= 0 ? (_width - left) : std::min(_width - left, width);
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116 height = height <= 0 ? (_height - top) : std::min(_height - top, height);
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117 return {data(left, top), width, height, _format, _rowStride, _pixStride};
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118 }
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119
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120 ImageView rotated(int degree) const
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121 {
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122 switch ((degree + 360) % 360) {
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123 case 90: return {data(0, _height - 1), _height, _width, _format, _pixStride, -_rowStride};
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124 case 180: return {data(_width - 1, _height - 1), _width, _height, _format, -_rowStride, -_pixStride};
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125 case 270: return {data(_width - 1, 0), _height, _width, _format, -_pixStride, _rowStride};
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126 }
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127 return *this;
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128 }
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129
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130 ImageView subsampled(int scale) const
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131 {
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132 return {_data, _width / scale, _height / scale, _format, _rowStride * scale, _pixStride * scale};
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133 }
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134
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135 };
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136
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137 class Image : public ImageView
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138 {
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139 std::unique_ptr<uint8_t[]> _memory;
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140 Image(std::unique_ptr<uint8_t[]>&& data, int w, int h, ImageFormat f) : ImageView(data.get(), w, h, f), _memory(std::move(data)) {}
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141
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142 public:
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143 Image() = default;
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144 Image(int w, int h, ImageFormat f = ImageFormat::Lum) : Image(std::make_unique<uint8_t[]>(w * h * PixStride(f)), w, h, f) {}
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145 };
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146
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147 } // ZXing
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148