Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccutil/qrsequence.h @ 40:aa33339d6b8a upstream

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ADD: MuPDF v1.26.10: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.5.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:31:38 +0200
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children
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: qrsequence.h
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3 // Description: Quasi-random sequence generator class.
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4 // Author: Ranjith Unnikrishnan
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5 //
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6 // Class to generate a (deterministic) quasi-random Van der Corput sequence that
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7 // covers the interval [0,N) without repetition.
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8 //
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9 // The sequence is generated by reversing the base-2 representation of the
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10 // sequence of natural numbers {0, 1,... M-1}, where M is 2^{num_bits_} and
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11 // num_bits is the minimum number of bits required to represent N. If a reversed
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12 // numbers is >= N it is rejected and the next natural number is considered
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13 // until a valid output number is found.
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14 //
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15 // (C) Copyright 2009, Google Inc.
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16 // Licensed under the Apache License, Version 2.0 (the "License"); you may not
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17 // use this file except in compliance with the License. You may obtain a copy
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18 // of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required
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19 // by applicable law or agreed to in writing, software distributed under the
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20 // License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
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21 // OF ANY KIND, either express or implied. See the License for the specific
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22 // language governing permissions and limitations under the License.
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23 //
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24 ///////////////////////////////////////////////////////////////////////
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25
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26 #ifndef TESSERACT_CCUTIL_QRSEQUENCE_H_
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27 #define TESSERACT_CCUTIL_QRSEQUENCE_H_
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28
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29 #include <cmath>
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30
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31 class QRSequenceGenerator {
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32 public:
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33 // Object is initialized with the size of the output range.
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34 explicit QRSequenceGenerator(int N) : N_(N), next_num_(0) {
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35 num_bits_ = static_cast<int>(ceil(log(static_cast<double>(N)) / log(2.0)));
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36 }
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37
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38 // Main worker method that retrieves the next number in the sequence.
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39 // Returns kInvalidVal if called more than N times after object initialization
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40 int GetVal() {
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41 const int kInvalidVal = -1;
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42 const int kMaxNaturalNumberValue = 1 << num_bits_;
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43 if (next_num_ >= kMaxNaturalNumberValue) {
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44 return kInvalidVal;
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45 }
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46 int n = next_num_;
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47
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48 while (next_num_ < kMaxNaturalNumberValue) {
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49 n = GetBinaryReversedInteger(next_num_++);
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50 if (n < N_) {
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51 break;
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52 }
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53 }
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54 return (next_num_ > kMaxNaturalNumberValue) ? kInvalidVal : n;
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55 }
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56
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57 protected:
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58 // Outputs the integer formed by reversing the bits of the input integer. Only
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59 // the lowest num_bits_ bits of the input integer are reversed.
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60 int GetBinaryReversedInteger(int in_val) const {
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61 int bit_pos = num_bits_;
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62 int out_val = 0;
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63 while (bit_pos--) {
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64 // Set the value of the last bit.
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65 out_val |= (in_val & 0x1);
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66 if (bit_pos > 0) {
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67 // Left-shift output value to prepare for storing the next bit.
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68 out_val <<= 1;
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69 }
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70 // Right-shift input value to prepare for retrieving the next bit.
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71 in_val >>= 1;
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72 }
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73 return out_val;
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74 }
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75 int N_;
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76 // Next number to be considered for reversal and output.
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77 int next_num_;
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78 // number of bits required to represent the numbers of the sequence
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79 int num_bits_;
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80 };
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81
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82 #endif // TESSERACT_CCUTIL_QRSEQUENCE_H_