Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/classify/intfeaturespace.cpp @ 27:28f7eb8e96ac

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Add FreeBSD to classifiers
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 19:08:19 +0200
parents b50eed0cc0ef
children
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2
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1 // Copyright 2010 Google Inc. All Rights Reserved.
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2 // Author: rays@google.com (Ray Smith)
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3 ///////////////////////////////////////////////////////////////////////
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4 // File: intfeaturespace.cpp
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5 // Description: Indexed feature space based on INT_FEATURE_STRUCT.
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6 //
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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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18
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19 #define _USE_MATH_DEFINES // for M_PI
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20 #include "intfeaturespace.h"
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21 #include <cmath> // for M_PI
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22 #include "intfx.h"
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24 namespace tesseract {
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26 IntFeatureSpace::IntFeatureSpace() : x_buckets_(0), y_buckets_(0), theta_buckets_(0) {}
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27
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28 void IntFeatureSpace::Init(uint8_t xbuckets, uint8_t ybuckets, uint8_t thetabuckets) {
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29 x_buckets_ = xbuckets;
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30 y_buckets_ = ybuckets;
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31 theta_buckets_ = thetabuckets;
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32 }
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33
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34 // Serializes the feature space definition to the given file.
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35 // Returns false on error.
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36 bool IntFeatureSpace::Serialize(FILE *fp) const {
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37 if (fwrite(&x_buckets_, sizeof(x_buckets_), 1, fp) != 1) {
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38 return false;
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39 }
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40 if (fwrite(&y_buckets_, sizeof(y_buckets_), 1, fp) != 1) {
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41 return false;
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42 }
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43 if (fwrite(&theta_buckets_, sizeof(theta_buckets_), 1, fp) != 1) {
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44 return false;
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45 }
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46 return true;
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47 }
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48
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49 // Returns an INT_FEATURE_STRUCT corresponding to the given index.
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50 // This is the inverse of the Index member.
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51 INT_FEATURE_STRUCT IntFeatureSpace::PositionFromIndex(int index) const {
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52 return PositionFromBuckets(index / (y_buckets_ * theta_buckets_),
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53 index / theta_buckets_ % y_buckets_, index % theta_buckets_);
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54 }
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55
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56 // Bulk calls to Index. Maps the given array of features to a vector of
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57 // int32_t indices in the same order as the input.
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58 void IntFeatureSpace::IndexFeatures(const INT_FEATURE_STRUCT *features, int num_features,
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59 std::vector<int> *mapped_features) const {
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60 mapped_features->clear();
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61 for (int f = 0; f < num_features; ++f) {
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62 mapped_features->push_back(Index(features[f]));
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63 }
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64 }
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65
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66 // Bulk calls to Index. Maps the given array of features to a vector of
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67 // sorted int32_t indices.
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68 void IntFeatureSpace::IndexAndSortFeatures(const INT_FEATURE_STRUCT *features, int num_features,
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69 std::vector<int> *sorted_features) const {
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70 sorted_features->clear();
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71 for (int f = 0; f < num_features; ++f) {
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72 sorted_features->push_back(Index(features[f]));
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73 }
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74 std::sort(sorted_features->begin(), sorted_features->end());
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75 }
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76
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77 // Returns a feature space index for the given x,y position in a display
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78 // window, or -1 if the feature is a miss.
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79 int IntFeatureSpace::XYToFeatureIndex(int x, int y) const {
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80 // Round the x,y position to a feature. Search for a valid theta.
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81 INT_FEATURE_STRUCT feature(x, y, 0);
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82 int index = -1;
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83 for (int theta = 0; theta <= UINT8_MAX && index < 0; ++theta) {
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84 feature.Theta = theta;
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85 index = Index(feature);
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86 }
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87 if (index < 0) {
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88 tprintf("(%d,%d) does not exist in feature space!\n", x, y);
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89 return -1;
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90 }
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91 feature = PositionFromIndex(index);
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92 tprintf("Click at (%d, %d) ->(%d, %d), ->(%d, %d)\n", x, y, feature.X, feature.Y, x - feature.X,
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93 y - feature.Y);
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94 // Get the relative position of x,y from the rounded feature.
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95 x -= feature.X;
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96 y -= feature.Y;
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97 if (x != 0 || y != 0) {
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98 double angle = atan2(static_cast<double>(y), static_cast<double>(x)) + M_PI;
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99 angle *= kIntFeatureExtent / (2.0 * M_PI);
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100 feature.Theta = static_cast<uint8_t>(angle + 0.5);
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101 index = Index(feature);
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102 if (index < 0) {
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103 tprintf("Feature failed to map to a valid index:");
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104 feature.print();
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105 return -1;
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106 }
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107 feature = PositionFromIndex(index);
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108 }
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109 feature.print();
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110 return index;
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111 }
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112
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113 // Returns an INT_FEATURE_STRUCT corresponding to the given bucket coords.
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114 INT_FEATURE_STRUCT IntFeatureSpace::PositionFromBuckets(int x, int y, int theta) const {
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115 INT_FEATURE_STRUCT pos((x * kIntFeatureExtent + kIntFeatureExtent / 2) / x_buckets_,
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116 (y * kIntFeatureExtent + kIntFeatureExtent / 2) / y_buckets_,
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117 DivRounded(theta * kIntFeatureExtent, theta_buckets_));
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118 return pos;
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119 }
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120
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121 } // namespace tesseract.