Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccutil/bitvector.h @ 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 // File: bitvector.h
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3 // Description: Class replacement for BITVECTOR.
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4 // Author: Ray Smith
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5 //
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6 // (C) Copyright 2011, Google Inc.
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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 #ifndef TESSERACT_CCUTIL_BITVECTOR_H_
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20 #define TESSERACT_CCUTIL_BITVECTOR_H_
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22 #include <tesseract/export.h>
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24 #include <cassert>
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25 #include <cstdint> // for uint8_t
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26 #include <cstdio>
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27 #include <vector> // for std::vector
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29 namespace tesseract {
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31 // Trivial class to encapsulate a fixed-length array of bits, with
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32 // Serialize/DeSerialize. Replaces the old macros.
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33 class TESS_API BitVector {
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34 public:
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35 // Fast lookup table to get the first least significant set bit in a byte.
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36 // For zero, the table has 255, but since it is a special case, most code
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37 // that uses this table will check for zero before looking up lsb_index_.
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38 static const uint8_t lsb_index_[256];
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39 // Fast lookup table to get the residual bits after zeroing the least
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40 // significant set bit in a byte.
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41 static const uint8_t lsb_eroded_[256];
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42 // Fast lookup table to give the number of set bits in a byte.
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43 static const int hamming_table_[256];
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45 BitVector() = default;
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46 // Initializes the array to length * false.
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47 explicit BitVector(int length) : bit_size_(length), array_(WordLength()) {
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48 }
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49 BitVector(const BitVector &src) : bit_size_(src.bit_size_), array_(src.array_) {
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50 }
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51 BitVector &operator=(const BitVector &src);
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52 ~BitVector() = default;
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54 // Initializes the array to length * false.
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55 void Init(int length);
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57 int empty() const {
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58 return bit_size_ == 0;
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59 }
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61 // Returns the number of bits that are accessible in the vector.
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62 int size() const {
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63 return bit_size_;
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64 }
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65
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66 // Writes to the given file. Returns false in case of error.
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67 bool Serialize(FILE *fp) const;
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68 // Reads from the given file. Returns false in case of error.
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69 // If swap is true, assumes a big/little-endian swap is needed.
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70 bool DeSerialize(bool swap, FILE *fp);
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71
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72 void SetAllFalse();
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73 void SetAllTrue();
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74
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75 // Accessors to set/reset/get bits.
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76 // The range of index is [0, size()-1].
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77 // There is debug-only bounds checking.
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78 void SetBit(int index) {
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79 array_[WordIndex(index)] |= BitMask(index);
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80 }
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81 void ResetBit(int index) {
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82 array_[WordIndex(index)] &= ~BitMask(index);
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83 }
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84 void SetValue(int index, bool value) {
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85 if (value) {
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86 SetBit(index);
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87 } else {
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88 ResetBit(index);
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89 }
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90 }
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91 bool At(int index) const {
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92 return (array_[WordIndex(index)] & BitMask(index)) != 0;
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93 }
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94 bool operator[](int index) const {
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95 return (array_[WordIndex(index)] & BitMask(index)) != 0;
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96 }
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97
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98 // Returns the index of the next set bit after the given index.
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99 // Useful for quickly iterating through the set bits in a sparse vector.
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100 int NextSetBit(int prev_bit) const;
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101
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102 // Returns the number of set bits in the vector.
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103 int NumSetBits() const;
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104
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105 // Logical in-place operations on whole bit vectors. Tries to do something
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106 // sensible if they aren't the same size, but they should be really.
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107 void operator|=(const BitVector &other);
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108 void operator&=(const BitVector &other);
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109 void operator^=(const BitVector &other);
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110 // Set subtraction *this = v1 - v2.
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111 void SetSubtract(const BitVector &v1, const BitVector &v2);
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112
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113 private:
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114 // Allocates memory for a vector of the given length.
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115 void Alloc(int length);
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116
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117 // Computes the index to array_ for the given index, with debug range
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118 // checking.
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119 int WordIndex(int index) const {
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120 assert(0 <= index && index < bit_size_);
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121 return index / kBitFactor;
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122 }
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123 // Returns a mask to select the appropriate bit for the given index.
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124 uint32_t BitMask(int index) const {
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125 return 1 << (index & (kBitFactor - 1));
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126 }
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127 // Returns the number of array elements needed to represent the current
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128 // bit_size_.
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129 int WordLength() const {
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130 return (bit_size_ + kBitFactor - 1) / kBitFactor;
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131 }
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132 // Returns the number of bytes consumed by the array_.
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133 int ByteLength() const {
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134 return WordLength() * sizeof(array_[0]);
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135 }
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136
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137 // Number of bits in this BitVector.
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138 int32_t bit_size_ = 0;
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139 // Array of words used to pack the bits.
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140 // Bits are stored little-endian by uint32_t word, ie by word first and then
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141 // starting with the least significant bit in each word.
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142 std::vector<uint32_t> array_;
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143 // Number of bits in an array_ element.
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144 static const int kBitFactor = sizeof(array_[0]) * 8;
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145 };
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146
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147 } // namespace tesseract.
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148
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149 #endif // TESSERACT_CCUTIL_BITVECTOR_H_