Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/training/pango/boxchar.h @ 46:7ee69f120f19 default tip

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>>>>> 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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1 /**********************************************************************
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2 * File: boxchar.h
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3 * Description: Simple class to associate a Tesseract classification unit with
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4 * its bounding box so that the boxes can be rotated as the image
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5 * is rotated for degradation. Also includes routines to output
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6 * the character-tagged boxes to a boxfile.
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7 * Author: Ray Smith
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8 *
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9 * (C) Copyright 2013, Google Inc.
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10 * Licensed under the Apache License, Version 2.0 (the "License");
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11 * you may not use this file except in compliance with the License.
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12 * You may obtain a copy of the License at
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13 * http://www.apache.org/licenses/LICENSE-2.0
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14 * Unless required by applicable law or agreed to in writing, software
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15 * distributed under the License is distributed on an "AS IS" BASIS,
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16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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17 * See the License for the specific language governing permissions and
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18 * limitations under the License.
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19 *
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20 **********************************************************************/
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22 #ifndef TESSERACT_TRAINING_BOXCHAR_H_
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23 #define TESSERACT_TRAINING_BOXCHAR_H_
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25 #include <string>
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26 #include <vector>
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28 #include <allheaders.h> // for Leptonica API
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29 #if (LIBLEPT_MAJOR_VERSION == 1 && LIBLEPT_MINOR_VERSION >= 83) || LIBLEPT_MAJOR_VERSION > 1
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30 #include <pix_internal.h> // for fast access to Box geometry
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31 #endif
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32 #include <tesseract/export.h>
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34 namespace tesseract {
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36 class BoxChar {
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37 public:
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38 BoxChar(const char *utf8_str, int len);
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40 ~BoxChar();
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42 // Accessors.
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43 const std::string &ch() const {
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44 return ch_;
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45 }
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46 const Box *box() const {
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47 return box_;
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48 }
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49 const int &page() const {
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50 return page_;
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51 }
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52 void set_rtl_index(int index) {
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53 rtl_index_ = index;
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54 }
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55 const int &rtl_index() const {
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56 return rtl_index_;
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57 }
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58
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59 // Set the box_ member.
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60 void AddBox(int x, int y, int width, int height);
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61
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62 void set_page(int page) {
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63 page_ = page;
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64 }
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65
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66 std::string *mutable_ch() {
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67 return &ch_;
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68 }
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69 Box *mutable_box() {
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70 return box_;
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71 }
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73 // Sort function for sorting by left edge of box. Note that this will not
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74 // work properly until after InsertNewlines and InsertSpaces.
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75 bool operator<(const BoxChar &other) const {
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76 if (box_ == nullptr) {
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77 return true;
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78 }
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79 if (other.box_ == nullptr) {
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80 return false;
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81 }
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82 return box_->x < other.box_->x;
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83 }
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84 // Increments *num_rtl and *num_ltr according to the directionality of
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85 // characters in the box.
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86 void GetDirection(int *num_rtl, int *num_ltr) const;
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87 // Reverses the order of unicodes within the box. If Pango generates a
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88 // ligature, these will get reversed on output, so reverse now.
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89 void ReverseUnicodesInBox();
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90
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91 static void TranslateBoxes(int xshift, int yshift, std::vector<BoxChar *> *boxes);
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92
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93 // Prepares for writing the boxes to a file by inserting newlines, spaces,
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94 // and re-ordering so the boxes are strictly left-to-right.
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95 static void PrepareToWrite(std::vector<BoxChar *> *boxes);
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96 // Inserts newline (tab) characters into the vector at newline positions.
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97 static void InsertNewlines(bool rtl_rules, bool vertical_rules, std::vector<BoxChar *> *boxes);
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98 // Converts nullptr boxes to space characters, with appropriate bounding
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99 // boxes.
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100 static void InsertSpaces(bool rtl_rules, bool vertical_rules, std::vector<BoxChar *> *boxes);
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101 // Reorders text in a right-to-left script in left-to-right order.
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102 static void ReorderRTLText(std::vector<BoxChar *> *boxes);
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103 // Returns true if the vector contains mostly RTL characters.
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104 static bool ContainsMostlyRTL(const std::vector<BoxChar *> &boxes);
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105 // Returns true if the text is mostly laid out vertically.
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106 static bool MostlyVertical(const std::vector<BoxChar *> &boxes);
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107
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108 // Returns the total length of all the strings in the boxes.
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109 static int TotalByteLength(const std::vector<BoxChar *> &boxes);
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110
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111 // Rotate the vector of boxes between start and end by the given rotation.
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112 // The rotation is in radians clockwise about the given center.
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113 static void RotateBoxes(float rotation, int xcenter, int ycenter, int start_box, int end_box,
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114 std::vector<BoxChar *> *boxes);
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115
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116 // Create a tesseract box file from the vector of boxes. The image height
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117 // is needed to convert to tesseract coordinates.
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118 static void WriteTesseractBoxFile(const std::string &name, int height,
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119 const std::vector<BoxChar *> &boxes);
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120 // Gets the tesseract box file as a string from the vector of boxes.
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121 // The image height is needed to convert to tesseract coordinates.
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122 static std::string GetTesseractBoxStr(int height, const std::vector<BoxChar *> &boxes);
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123
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124 private:
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125 std::string ch_;
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126 Box *box_;
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127 int page_;
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128 // If the box is an RTL character, contains the original position in the
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129 // array of boxes (before reversal), otherwise -1.
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130 int rtl_index_;
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131 };
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132
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133 // Sort predicate to sort a vector of BoxChar*.
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134 struct BoxCharPtrSort {
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135 bool operator()(const BoxChar *box1, const BoxChar *box2) const {
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136 if (box1->rtl_index() >= 0 && box2->rtl_index() >= 0) {
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137 return box2->rtl_index() < box1->rtl_index();
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138 }
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139 return *box1 < *box2;
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140 }
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141 };
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142
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143 } // namespace tesseract
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144
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145 #endif // TESSERACT_TRAINING_BOXCHAR_H_