Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccstruct/mod128.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 * File: mod128.h (Formerly dir128.h)
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3 * Description: Header for class which implements modulo arithmetic.
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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 #ifndef MOD128_H
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20 #define MOD128_H
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22 #include "points.h"
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24 namespace tesseract {
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26 #define MODULUS 128 /*range of directions */
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27 #define DIRBITS 7 // no of bits used
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28 #define DIRSCALE 1000 // length of vector
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30 class DIR128 {
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31 public:
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32 DIR128() = default;
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34 DIR128( // constructor
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35 int16_t value) { // value to assign
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36 value %= MODULUS; // modulo arithmetic
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37 if (value < 0) {
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38 value += MODULUS; // done properly
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39 }
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40 dir = static_cast<int8_t>(value);
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41 }
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42 DIR128(const FCOORD fc); // quantize vector
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44 DIR128 &operator=( // assign of int16_t
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45 int16_t value) { // value to assign
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46 value %= MODULUS; // modulo arithmetic
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47 if (value < 0) {
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48 value += MODULUS; // done properly
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49 }
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50 dir = static_cast<int8_t>(value);
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51 return *this;
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52 }
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53 int8_t operator-( // subtraction
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54 const DIR128 &minus) const // for signed result
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55 {
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56 // result
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57 int16_t result = dir - minus.dir;
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59 if (result > MODULUS / 2) {
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60 result -= MODULUS; // get in range
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61 } else if (result < -MODULUS / 2) {
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62 result += MODULUS;
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63 }
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64 return static_cast<int8_t>(result);
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65 }
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66 DIR128 operator+( // addition
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67 const DIR128 &add) const // of itself
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68 {
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69 DIR128 result; // sum
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71 result = dir + add.dir; // let = do the work
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72 return result;
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73 }
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74 DIR128 &operator+=( // same as +
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75 const DIR128 &add) {
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76 *this = dir + add.dir; // let = do the work
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77 return *this;
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78 }
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79 int8_t get_dir() const { // access function
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80 return dir;
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81 }
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82
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83 int8_t dir; // a direction
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84 };
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85
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86 } // namespace tesseract
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87
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88 #endif