Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/textord/workingpartset.cpp @ 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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rev   line source
2
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1 ///////////////////////////////////////////////////////////////////////
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2 // File: workingpartset.cpp
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3 // Description: Class to hold a working set of partitions of the page
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4 // during construction of text/image regions.
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5 // Author: Ray Smith
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6 // Created: Tue Ocr 28 17:21:01 PDT 2008
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7 //
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8 // (C) Copyright 2008, Google Inc.
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9 // Licensed under the Apache License, Version 2.0 (the "License");
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10 // you may not use this file except in compliance with the License.
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11 // You may obtain a copy of the License at
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12 // http://www.apache.org/licenses/LICENSE-2.0
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13 // Unless required by applicable law or agreed to in writing, software
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14 // distributed under the License is distributed on an "AS IS" BASIS,
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15 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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16 // See the License for the specific language governing permissions and
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17 // limitations under the License.
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18 //
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19 ///////////////////////////////////////////////////////////////////////
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20
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21 #include "workingpartset.h"
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22 #include "colpartition.h"
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24 namespace tesseract {
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26 // Add the partition to this WorkingPartSet. Unrelated partitions are
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27 // stored in the order in which they are received, but if the partition
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28 // has a SingletonPartner, make sure that it stays with its partner.
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29 void WorkingPartSet::AddPartition(ColPartition *part) {
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30 ColPartition *partner = part->SingletonPartner(true);
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31 if (partner != nullptr) {
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32 ASSERT_HOST(partner->SingletonPartner(false) == part);
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33 }
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34 if (latest_part_ == nullptr || partner == nullptr) {
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35 // This partition goes at the end of the list
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36 part_it_.move_to_last();
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37 } else if (latest_part_->SingletonPartner(false) != part) {
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38 // Reposition the iterator to the correct partner, or at the end.
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39 for (part_it_.move_to_first(); !part_it_.at_last() && part_it_.data() != partner;
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40 part_it_.forward()) {
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41 ;
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42 }
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43 }
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44 part_it_.add_after_then_move(part);
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45 latest_part_ = part;
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46 }
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47
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48 // Make blocks out of any partitions in this WorkingPartSet, and append
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49 // them to the end of the blocks list. bleft, tright and resolution give
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50 // the bounds and resolution of the source image, so that blocks can be
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51 // made to fit in the bounds.
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52 // All ColPartitions go in the used_parts list, as they need to be kept
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53 // around, but are no longer needed.
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54 void WorkingPartSet::ExtractCompletedBlocks(const ICOORD &bleft, const ICOORD &tright,
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55 int resolution, ColPartition_LIST *used_parts,
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56 BLOCK_LIST *blocks, TO_BLOCK_LIST *to_blocks) {
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57 MakeBlocks(bleft, tright, resolution, used_parts);
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58 BLOCK_IT block_it(blocks);
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59 block_it.move_to_last();
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60 block_it.add_list_after(&completed_blocks_);
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61 TO_BLOCK_IT to_block_it(to_blocks);
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62 to_block_it.move_to_last();
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63 to_block_it.add_list_after(&to_blocks_);
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64 }
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65
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66 // Insert the given blocks at the front of the completed_blocks_ list so
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67 // they can be kept in the correct reading order.
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68 void WorkingPartSet::InsertCompletedBlocks(BLOCK_LIST *blocks, TO_BLOCK_LIST *to_blocks) {
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69 BLOCK_IT block_it(&completed_blocks_);
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70 block_it.add_list_before(blocks);
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71 TO_BLOCK_IT to_block_it(&to_blocks_);
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72 to_block_it.add_list_before(to_blocks);
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73 }
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74
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75 // Make a block using lines parallel to the given vector that fit between
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76 // the min and max coordinates specified by the ColPartitions.
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77 // Construct a block from the given list of partitions.
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78 void WorkingPartSet::MakeBlocks(const ICOORD &bleft, const ICOORD &tright, int resolution,
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79 ColPartition_LIST *used_parts) {
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80 part_it_.move_to_first();
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81 while (!part_it_.empty()) {
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82 // Gather a list of ColPartitions in block_parts that will be split
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83 // by linespacing into smaller blocks.
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84 ColPartition_LIST block_parts;
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85 ColPartition_IT block_it(&block_parts);
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86 ColPartition *next_part = nullptr;
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87 bool text_block = false;
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88 do {
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89 ColPartition *part = part_it_.extract();
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90 if (part->blob_type() == BRT_UNKNOWN || (part->IsTextType() && part->type() != PT_TABLE)) {
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91 text_block = true;
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92 }
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93 part->set_working_set(nullptr);
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94 part_it_.forward();
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95 block_it.add_after_then_move(part);
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96 next_part = part->SingletonPartner(false);
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97 if (part_it_.empty() || next_part != part_it_.data()) {
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98 // Sequences of partitions can get split by titles.
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99 next_part = nullptr;
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100 }
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101 // Merge adjacent blocks that are of the same type and let the
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102 // linespacing determine the real boundaries.
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103 if (next_part == nullptr && !part_it_.empty()) {
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104 ColPartition *next_block_part = part_it_.data();
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105 const TBOX &part_box = part->bounding_box();
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106 const TBOX &next_box = next_block_part->bounding_box();
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107
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108 // In addition to the same type, the next box must not be above the
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109 // current box, nor (if image) too far below.
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110 PolyBlockType type = part->type(), next_type = next_block_part->type();
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111 if (ColPartition::TypesSimilar(type, next_type) && !part->IsLineType() &&
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112 !next_block_part->IsLineType() && next_box.bottom() <= part_box.top() &&
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113 (text_block || part_box.bottom() <= next_box.top())) {
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114 next_part = next_block_part;
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115 }
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116 }
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117 } while (!part_it_.empty() && next_part != nullptr);
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118 if (!text_block) {
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119 TO_BLOCK *to_block = ColPartition::MakeBlock(bleft, tright, &block_parts, used_parts);
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120 if (to_block != nullptr) {
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121 TO_BLOCK_IT to_block_it(&to_blocks_);
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122 to_block_it.add_to_end(to_block);
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123 BLOCK_IT block_it(&completed_blocks_);
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124 block_it.add_to_end(to_block->block);
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125 }
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126 } else {
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127 // Further sub-divide text blocks where linespacing changes.
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128 ColPartition::LineSpacingBlocks(bleft, tright, resolution, &block_parts, used_parts,
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129 &completed_blocks_, &to_blocks_);
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130 }
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131 }
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132 part_it_.set_to_list(&part_set_);
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133 latest_part_ = nullptr;
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134 ASSERT_HOST(completed_blocks_.length() == to_blocks_.length());
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135 }
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136
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137 } // namespace tesseract.