Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/textord/colpartitionset.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: colpartitionset.h
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3 // Description: Class to hold a list of ColPartitions of the page that
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4 // correspond roughly to columns.
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5 // Author: Ray Smith
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6 //
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7 // (C) Copyright 2008, 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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18 ///////////////////////////////////////////////////////////////////////
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20 #ifndef TESSERACT_TEXTORD_COLPARTITIONSET_H_
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21 #define TESSERACT_TEXTORD_COLPARTITIONSET_H_
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23 #include "colpartition.h" // For ColPartition_LIST.
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24 #include "rect.h" // For TBOX.
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25 #include "tabvector.h" // For BLOBNBOX_CLIST.
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27 namespace tesseract {
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29 class WorkingPartSet_LIST;
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30 class ColSegment_LIST;
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31 class ColPartitionSet;
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32 using PartSetVector = std::vector<ColPartitionSet *>;
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34 // ColPartitionSet is a class that holds a list of ColPartitions.
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35 // Its main use is in holding a candidate partitioning of the width of the
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36 // image into columns, where each member ColPartition is a single column.
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37 // ColPartitionSets are used in building the column layout of a page.
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38 class ColPartitionSet : public ELIST_LINK {
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39 public:
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40 ColPartitionSet() = default;
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41 explicit ColPartitionSet(ColPartition_LIST *partitions);
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42 explicit ColPartitionSet(ColPartition *partition);
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44 ~ColPartitionSet() = default;
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46 // Simple accessors.
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47 const TBOX &bounding_box() const {
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48 return bounding_box_;
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49 }
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50 bool Empty() const {
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51 return parts_.empty();
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52 }
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53 int ColumnCount() const {
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54 return parts_.length();
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55 }
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57 // Returns the number of columns of good width.
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58 int GoodColumnCount() const;
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60 // Return an element of the parts_ list from its index.
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61 ColPartition *GetColumnByIndex(int index);
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63 // Return the ColPartition that contains the given coords, if any, else
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64 // nullptr.
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65 ColPartition *ColumnContaining(int x, int y);
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67 // Return the bounding boxes of columns at the given y-range
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68 void GetColumnBoxes(int y_bottom, int y_top, ColSegment_LIST *segments);
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70 // Extract all the parts from the list, relinquishing ownership.
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71 void RelinquishParts();
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73 // Attempt to improve this by adding partitions or expanding partitions.
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74 void ImproveColumnCandidate(const WidthCallback &cb, PartSetVector *src_sets);
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76 // If this set is good enough to represent a new partitioning into columns,
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77 // add it to the vector of sets, otherwise delete it.
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78 void AddToColumnSetsIfUnique(PartSetVector *column_sets,
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79 const WidthCallback &cb);
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81 // Return true if the partitions in other are all compatible with the columns
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82 // in this.
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83 bool CompatibleColumns(bool debug, ColPartitionSet *other,
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84 const WidthCallback &cb);
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86 // Returns the total width of all blobs in the part_set that do not lie
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87 // within an approved column. Used as a cost measure for using this
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88 // column set over another that might be compatible.
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89 int UnmatchedWidth(ColPartitionSet *part_set);
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91 // Return true if this ColPartitionSet makes a legal column candidate by
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92 // having legal individual partitions and non-overlapping adjacent pairs.
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93 bool LegalColumnCandidate();
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95 // Return a copy of this. If good_only will only copy the Good ColPartitions.
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96 ColPartitionSet *Copy(bool good_only);
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98 // Display the edges of the columns at the given y coords.
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99 void DisplayColumnEdges(int y_bottom, int y_top, ScrollView *win);
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100
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101 // Return the ColumnSpanningType that best explains the columns overlapped
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102 // by the given coords(left,right,y), with the given margins.
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103 // Also return the first and last column index touched by the coords and
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104 // the leftmost spanned column.
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105 // Column indices are 2n + 1 for real columns (0 based) and even values
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106 // represent the gaps in between columns, with 0 being left of the leftmost.
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107 // resolution refers to the ppi resolution of the image. It may be 0 if only
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108 // the first_col and last_col are required.
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109 ColumnSpanningType SpanningType(int resolution, int left, int right,
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110 int height, int y, int left_margin,
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111 int right_margin, int *first_col,
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112 int *last_col, int *first_spanned_col);
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113
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114 // The column_set has changed. Close down all in-progress WorkingPartSets in
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115 // columns that do not match and start new ones for the new columns in this.
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116 // As ColPartitions are turned into BLOCKs, the used ones are put in
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117 // used_parts, as they still need to be referenced in the grid.
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118 void ChangeWorkColumns(const ICOORD &bleft, const ICOORD &tright,
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119 int resolution, ColPartition_LIST *used_parts,
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120 WorkingPartSet_LIST *working_set);
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121
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122 // Accumulate the widths and gaps into the given variables.
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123 void AccumulateColumnWidthsAndGaps(int *total_width, int *width_samples,
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124 int *total_gap, int *gap_samples);
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125
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126 // Provide debug output for this ColPartitionSet and all the ColPartitions.
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127 void Print();
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128
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129 private:
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130 // Add the given partition to the list in the appropriate place.
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131 void AddPartition(ColPartition *new_part, ColPartition_IT *it);
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132
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133 // Compute the coverage and good column count. Coverage is the amount of the
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134 // width of the page (in pixels) that is covered by ColPartitions, which are
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135 // used to provide candidate column layouts.
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136 // Coverage is split into good and bad. Good coverage is provided by
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137 // ColPartitions of a frequent width (according to the callback function
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138 // provided by TabFinder::WidthCB, which accesses stored statistics on the
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139 // widths of ColPartitions) and bad coverage is provided by all other
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140 // ColPartitions, even if they have tab vectors at both sides. Thus:
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141 // |-----------------------------------------------------------------|
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142 // | Double width heading |
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143 // |-----------------------------------------------------------------|
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144 // |-------------------------------| |-------------------------------|
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145 // | Common width ColPartition | | Common width ColPartition |
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146 // |-------------------------------| |-------------------------------|
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147 // the layout with two common-width columns has better coverage than the
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148 // double width heading, because the coverage is "good," even though less in
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149 // total coverage than the heading, because the heading coverage is "bad."
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150 void ComputeCoverage();
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151
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152 // Adds the coverage, column count and box for a single partition,
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153 // without adding it to the list. (Helper factored from ComputeCoverage.)
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154 void AddPartitionCoverageAndBox(const ColPartition &part);
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155
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156 // The partitions in this column candidate.
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157 ColPartition_LIST parts_;
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158 // The number of partitions that have a frequent column width.
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159 int good_column_count_;
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160 // Total width of all the good ColPartitions.
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161 int good_coverage_;
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162 // Total width of all the bad ColPartitions.
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163 int bad_coverage_;
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164 // Bounding box of all partitions in the set.
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165 TBOX bounding_box_;
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166 };
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167
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168 ELISTIZEH(ColPartitionSet)
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169
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170 } // namespace tesseract.
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171
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172 #endif // TESSERACT_TEXTORD_COLPARTITION_H_