Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/ccstruct/imagedata.h @ 17:dd9cdb856310

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Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +0200
parents b50eed0cc0ef
children
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: imagedata.h
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3 // Description: Class to hold information about a single image and its
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4 // corresponding boxes or text file.
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5 // Author: Ray Smith
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6 //
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7 // (C) Copyright 2013, Google Inc.
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8 // Licensed under the Apache License, Version 2.0 (the "License");
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9 // you may not use this file except in compliance with the License.
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10 // You may obtain a copy of the License at
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11 // http://www.apache.org/licenses/LICENSE-2.0
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12 // Unless required by applicable law or agreed to in writing, software
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13 // distributed under the License is distributed on an "AS IS" BASIS,
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14 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 // See the License for the specific language governing permissions and
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16 // limitations under the License.
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17 ///////////////////////////////////////////////////////////////////////
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19 #ifndef TESSERACT_IMAGE_IMAGEDATA_H_
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20 #define TESSERACT_IMAGE_IMAGEDATA_H_
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22 #include "image.h"
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23 #include "points.h" // for FCOORD
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25 #include <mutex> // for std::mutex
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26 #include <thread> // for std::thread
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28 struct Pix;
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30 namespace tesseract {
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32 class TFile;
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33 class ScrollView;
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34 class TBOX;
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36 // Amount of padding to apply in output pixels in feature mode.
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37 const int kFeaturePadding = 2;
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38 // Number of pixels to pad around text boxes.
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39 const int kImagePadding = 4;
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41 // Enum to determine the caching and data sequencing strategy.
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42 enum CachingStrategy {
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43 // Reads all of one file before moving on to the next. Requires samples to be
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44 // shuffled across files. Uses the count of samples in the first file as
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45 // the count in all the files to achieve high-speed random access. As a
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46 // consequence, if subsequent files are smaller, they get entries used more
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47 // than once, and if subsequent files are larger, some entries are not used.
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48 // Best for larger data sets that don't fit in memory.
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49 CS_SEQUENTIAL,
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50 // Reads one sample from each file in rotation. Does not require shuffled
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51 // samples, but is extremely disk-intensive. Samples in smaller files also
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52 // get used more often than samples in larger files.
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53 // Best for smaller data sets that mostly fit in memory.
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54 CS_ROUND_ROBIN,
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55 };
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57 // Class to hold information on a single image:
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58 // Filename, cached image as a Pix*, character boxes, text transcription.
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59 // The text transcription is the ground truth UTF-8 text for the image.
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60 // Character boxes are optional and indicate the desired segmentation of
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61 // the text into recognition units.
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62 class TESS_API ImageData {
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63 public:
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64 ImageData();
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65 // Takes ownership of the pix.
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66 ImageData(bool vertical, Image pix);
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67 ~ImageData();
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68
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69 // Builds and returns an ImageData from the basic data. Note that imagedata,
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70 // truth_text, and box_text are all the actual file data, NOT filenames.
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71 static ImageData *Build(const char *name, int page_number, const char *lang,
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72 const char *imagedata, int imagedatasize, const char *truth_text,
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73 const char *box_text);
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74
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75 // Writes to the given file. Returns false in case of error.
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76 bool Serialize(TFile *fp) const;
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77 // Reads from the given file. Returns false in case of error.
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78 bool DeSerialize(TFile *fp);
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79 // As DeSerialize, but only seeks past the data - hence a static method.
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80 static bool SkipDeSerialize(TFile *fp);
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81
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82 // Other accessors.
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83 const std::string &imagefilename() const {
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84 return imagefilename_;
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85 }
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86 void set_imagefilename(const std::string &name) {
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87 imagefilename_ = name;
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88 }
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89 int page_number() const {
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90 return page_number_;
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91 }
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92 void set_page_number(int num) {
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93 page_number_ = num;
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94 }
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95 const std::vector<char> &image_data() const {
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96 return image_data_;
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97 }
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98 const std::string &language() const {
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99 return language_;
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100 }
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101 void set_language(const std::string &lang) {
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102 language_ = lang;
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103 }
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104 const std::string &transcription() const {
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105 return transcription_;
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106 }
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107 const std::vector<TBOX> &boxes() const {
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108 return boxes_;
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109 }
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110 const std::vector<std::string> &box_texts() const {
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111 return box_texts_;
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112 }
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113 const std::string &box_text(int index) const {
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114 return box_texts_[index];
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115 }
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116 // Saves the given Pix as a PNG-encoded string and destroys it.
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117 // In case of missing PNG support in Leptonica use PNM format,
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118 // which requires more memory.
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119 void SetPix(Image pix);
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120 // Returns the Pix image for *this. Must be pixDestroyed after use.
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121 Image GetPix() const;
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122 // Gets anything and everything with a non-nullptr pointer, prescaled to a
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123 // given target_height (if 0, then the original image height), and aligned.
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124 // Also returns (if not nullptr) the width and height of the scaled image.
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125 // The return value is the scaled Pix, which must be pixDestroyed after use,
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126 // and scale_factor (if not nullptr) is set to the scale factor that was
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127 // applied to the image to achieve the target_height.
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128 Image PreScale(int target_height, int max_height, float *scale_factor, int *scaled_width,
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129 int *scaled_height, std::vector<TBOX> *boxes) const;
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130
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131 int MemoryUsed() const;
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132
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133 // Draws the data in a new window.
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134 void Display() const;
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135
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136 // Adds the supplied boxes and transcriptions that correspond to the correct
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137 // page number.
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138 void AddBoxes(const std::vector<TBOX> &boxes, const std::vector<std::string> &texts,
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139 const std::vector<int> &box_pages);
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140
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141 private:
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142 // Saves the given Pix as a PNG-encoded string and destroys it.
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143 // In case of missing PNG support in Leptonica use PNM format,
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144 // which requires more memory.
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145 static void SetPixInternal(Image pix, std::vector<char> *image_data);
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146 // Returns the Pix image for the image_data. Must be pixDestroyed after use.
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147 static Image GetPixInternal(const std::vector<char> &image_data);
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148 // Parses the text string as a box file and adds any discovered boxes that
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149 // match the page number. Returns false on error.
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150 bool AddBoxes(const char *box_text);
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151
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152 private:
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153 std::string imagefilename_; // File to read image from.
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154 int32_t page_number_; // Page number if multi-page tif or -1.
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155 // see https://github.com/tesseract-ocr/tesseract/pull/2965
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156 // EP: reconsider for tess6.0/opencv
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157 #ifdef TESSERACT_IMAGEDATA_AS_PIX
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158 Image internal_pix_;
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159 #endif
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160 std::vector<char> image_data_; // PNG/PNM file data.
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161 std::string language_; // Language code for image.
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162 std::string transcription_; // UTF-8 ground truth of image.
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163 std::vector<TBOX> boxes_; // If non-empty boxes of the image.
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164 std::vector<std::string> box_texts_; // String for text in each box.
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165 bool vertical_text_; // Image has been rotated from vertical.
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166 };
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167
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168 // A collection of ImageData that knows roughly how much memory it is using.
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169 class DocumentData {
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170 public:
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171 TESS_API
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172 explicit DocumentData(const std::string &name);
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173 TESS_API
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174 ~DocumentData();
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175
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176 // Reads all the pages in the given lstmf filename to the cache. The reader
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177 // is used to read the file.
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178 TESS_API
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179 bool LoadDocument(const char *filename, int start_page, int64_t max_memory, FileReader reader);
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180 // Sets up the document, without actually loading it.
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181 void SetDocument(const char *filename, int64_t max_memory, FileReader reader);
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182 // Writes all the pages to the given filename. Returns false on error.
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183 TESS_API
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184 bool SaveDocument(const char *filename, FileWriter writer);
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185
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186 // Adds the given page data to this document, counting up memory.
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187 TESS_API
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188 void AddPageToDocument(ImageData *page);
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189
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190 const std::string &document_name() const {
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191 std::lock_guard<std::mutex> lock(general_mutex_);
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192 return document_name_;
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193 }
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194 int NumPages() const {
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195 std::lock_guard<std::mutex> lock(general_mutex_);
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196 return total_pages_;
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197 }
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198 size_t PagesSize() const {
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diff changeset
199 return pages_.size();
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200 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
201 int64_t memory_used() const {
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parents:
diff changeset
202 std::lock_guard<std::mutex> lock(general_mutex_);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
203 return memory_used_;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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204 }
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
205 // If the given index is not currently loaded, loads it using a separate
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
206 // thread. Note: there are 4 cases:
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
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207 // Document uncached: IsCached() returns false, total_pages_ < 0.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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208 // Required page is available: IsPageAvailable returns true. In this case,
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parents:
diff changeset
209 // total_pages_ > 0 and
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Franz Glasner <fzglas.hg@dom66.de>
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210 // pages_offset_ <= index%total_pages_ <= pages_offset_+pages_.size()
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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211 // Pages are loaded, but the required one is not.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
212 // The requested page is being loaded by LoadPageInBackground. In this case,
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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213 // index == pages_offset_. Once the loading starts, the pages lock is held
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parents:
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214 // until it completes, at which point IsPageAvailable will unblock and return
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215 // true.
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216 void LoadPageInBackground(int index);
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217 // Returns a pointer to the page with the given index, modulo the total
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218 // number of pages. Blocks until the background load is completed.
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219 TESS_API
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220 const ImageData *GetPage(int index);
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221 // Returns true if the requested page is available, and provides a pointer,
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222 // which may be nullptr if the document is empty. May block, even though it
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parents:
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223 // doesn't guarantee to return true.
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parents:
diff changeset
224 bool IsPageAvailable(int index, ImageData **page);
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225 // Takes ownership of the given page index. The page is made nullptr in *this.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
226 ImageData *TakePage(int index) {
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parents:
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227 std::lock_guard<std::mutex> lock(pages_mutex_);
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parents:
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228 ImageData *page = pages_[index];
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229 pages_[index] = nullptr;
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230 return page;
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231 }
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parents:
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232 // Returns true if the document is currently loaded or in the process of
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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233 // loading.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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234 bool IsCached() const {
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Franz Glasner <fzglas.hg@dom66.de>
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235 return NumPages() >= 0;
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236 }
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parents:
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237 // Removes all pages from memory and frees the memory, but does not forget
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parents:
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238 // the document metadata. Returns the memory saved.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
239 int64_t UnCache();
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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240 // Shuffles all the pages in the document.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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241 void Shuffle();
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242
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parents:
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243 private:
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parents:
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244 // Sets the value of total_pages_ behind a mutex.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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245 void set_total_pages(int total) {
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246 std::lock_guard<std::mutex> lock(general_mutex_);
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parents:
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247 total_pages_ = total;
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248 }
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Franz Glasner <fzglas.hg@dom66.de>
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249 void set_memory_used(int64_t memory_used) {
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parents:
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250 std::lock_guard<std::mutex> lock(general_mutex_);
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
251 memory_used_ = memory_used;
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252 }
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253 // Locks the pages_mutex_ and loads as many pages as will fit into max_memory_
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parents:
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254 // starting at index pages_offset_.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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255 bool ReCachePages();
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256
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diff changeset
257 private:
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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258 // A name for this document.
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parents:
diff changeset
259 std::string document_name_;
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parents:
diff changeset
260 // A group of pages that corresponds in some loose way to a document.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
261 std::vector<ImageData *> pages_;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
262 // Page number of the first index in pages_.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
263 int pages_offset_;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
264 // Total number of pages in document (may exceed size of pages_.)
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
265 int total_pages_;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
266 // Total of all pix sizes in the document.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
267 int64_t memory_used_;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
268 // Max memory to use at any time.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
269 int64_t max_memory_;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
270 // Saved reader from LoadDocument to allow re-caching.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
271 FileReader reader_;
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
272 // Mutex that protects pages_ and pages_offset_ against multiple parallel
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
273 // loads, and provides a wait for page.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
274 std::mutex pages_mutex_;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
275 // Mutex that protects other data members that callers want to access without
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
276 // waiting for a load operation.
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
277 mutable std::mutex general_mutex_;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
278
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
279 // Thread which loads document.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
280 std::thread thread;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
281 };
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parents:
diff changeset
282
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
283 // A collection of DocumentData that knows roughly how much memory it is using.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
284 // Note that while it supports background read-ahead, it assumes that a single
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
285 // thread is accessing documents, ie it is not safe for multiple threads to
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
286 // access different documents in parallel, as one may de-cache the other's
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
287 // content.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
288 class DocumentCache {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
289 public:
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
290 TESS_API
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
291 explicit DocumentCache(int64_t max_memory);
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
292 TESS_API
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
293 ~DocumentCache();
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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parents:
diff changeset
294
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parents:
diff changeset
295 // Deletes all existing documents from the cache.
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
296 void Clear() {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
297 for (auto *document : documents_) {
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
298 delete document;
b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
299 }
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300 documents_.clear();
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301 num_pages_per_doc_ = 0;
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302 }
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303 // Adds all the documents in the list of filenames, counting memory.
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304 // The reader is used to read the files.
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305 TESS_API
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306 bool LoadDocuments(const std::vector<std::string> &filenames, CachingStrategy cache_strategy,
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307 FileReader reader);
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308
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309 // Adds document to the cache.
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310 bool AddToCache(DocumentData *data);
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311
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312 // Finds and returns a document by name.
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313 DocumentData *FindDocument(const std::string &document_name) const;
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314
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315 // Returns a page by serial number using the current cache_strategy_ to
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316 // determine the mapping from serial number to page.
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317 const ImageData *GetPageBySerial(int serial) {
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318 if (cache_strategy_ == CS_SEQUENTIAL) {
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319 return GetPageSequential(serial);
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320 } else {
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321 return GetPageRoundRobin(serial);
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322 }
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323 }
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324
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325 const std::vector<DocumentData *> &documents() const {
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326 return documents_;
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327 }
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328 // Returns the total number of pages in an epoch. For CS_ROUND_ROBIN cache
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329 // strategy, could take a long time.
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330 TESS_API
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331 int TotalPages();
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332
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333 private:
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334 // Returns a page by serial number, selecting them in a round-robin fashion
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335 // from all the documents. Highly disk-intensive, but doesn't need samples
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336 // to be shuffled between files to begin with.
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337 TESS_API
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338 const ImageData *GetPageRoundRobin(int serial);
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339 // Returns a page by serial number, selecting them in sequence from each file.
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340 // Requires the samples to be shuffled between the files to give a random or
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341 // uniform distribution of data. Less disk-intensive than GetPageRoundRobin.
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342 TESS_API
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343 const ImageData *GetPageSequential(int serial);
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344
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345 // Helper counts the number of adjacent cached neighbour documents_ of index
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346 // looking in direction dir, ie index+dir, index+2*dir etc.
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347 int CountNeighbourDocs(int index, int dir);
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348
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349 // A group of pages that corresponds in some loose way to a document.
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350 std::vector<DocumentData *> documents_;
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351 // Strategy to use for caching and serializing data samples.
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352 CachingStrategy cache_strategy_ = CS_SEQUENTIAL;
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353 // Number of pages in the first document, used as a divisor in
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354 // GetPageSequential to determine the document index.
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355 int num_pages_per_doc_ = 0;
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356 // Max memory allowed in this cache.
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357 int64_t max_memory_ = 0;
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358 };
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359
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360 } // namespace tesseract
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361
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362 #endif // TESSERACT_IMAGE_IMAGEDATA_H_