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workingpartset.h
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1
2 // File: workingpartset.h
3 // Description: Class to hold a working set of partitions of the page
4 // during construction of text/image regions.
5 // Author: Ray Smith
6 // Created: Tue Ocr 28 17:21:01 PDT 2008
7 //
8 // (C) Copyright 2008, Google Inc.
9 // Licensed under the Apache License, Version 2.0 (the "License");
10 // you may not use this file except in compliance with the License.
11 // You may obtain a copy of the License at
12 // http://www.apache.org/licenses/LICENSE-2.0
13 // Unless required by applicable law or agreed to in writing, software
14 // distributed under the License is distributed on an "AS IS" BASIS,
15 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 // See the License for the specific language governing permissions and
17 // limitations under the License.
18 //
20
21 #ifndef TESSERACT_TEXTORD_WORKINGPARSET_H__
22 #define TESSERACT_TEXTORD_WORKINGPARSET_H__
23
24 #include "blobbox.h" // For TO_BLOCK_LIST and BLOCK_LIST.
25 #include "colpartition.h" // For ColPartition_LIST.
26
27 namespace tesseract {
28
29 // WorkingPartSet holds a working set of ColPartitions during transformation
30 // from the grid-based storage to regions in logical reading order, and is
31 // therefore only used during construction of the regions.
32 class WorkingPartSet : public ELIST_LINK {
33 public:
34 WorkingPartSet() {
35 }
36 explicit WorkingPartSet(ColPartition* column)
37 : column_(column), latest_part_(NULL), part_it_(&part_set_) {
38 }
39
40 // Simple accessors.
41 ColPartition* column() const {
42 return column_;
43 }
44 void set_column(ColPartition* col) {
45 column_ = col;
46 }
47
48 // Add the partition to this WorkingPartSet. Partitions are generally
49 // stored in the order in which they are received, but if the partition
50 // has a SingletonPartner, make sure that it stays with its partner.
51 void AddPartition(ColPartition* part);
52
53 // Make blocks out of any partitions in this WorkingPartSet, and append
54 // them to the end of the blocks list. bleft, tright and resolution give
55 // the bounds and resolution of the source image, so that blocks can be
56 // made to fit in the bounds.
57 // All ColPartitions go in the used_parts list, as they need to be kept
58 // around, but are no longer needed.
59 void ExtractCompletedBlocks(const ICOORD& bleft, const ICOORD& tright,
60 int resolution, ColPartition_LIST* used_parts,
61 BLOCK_LIST* blocks, TO_BLOCK_LIST* to_blocks);
62
63 // Insert the given blocks at the front of the completed_blocks_ list so
64 // they can be kept in the correct reading order.
65 void InsertCompletedBlocks(BLOCK_LIST* blocks, TO_BLOCK_LIST* to_blocks);
66
67 private:
68 // Convert the part_set_ into blocks, starting a new block at a break
69 // in partnerships, or a change in linespacing (for text).
70 void MakeBlocks(const ICOORD& bleft, const ICOORD& tright, int resolution,
71 ColPartition_LIST* used_parts);
72
73 // The column that this working set applies to. Used by the caller.
74 ColPartition* column_;
75 // The most recently added partition.
76 ColPartition* latest_part_;
77 // All the partitions in the block that is currently under construction.
78 ColPartition_LIST part_set_;
79 // Iteratorn on part_set_ pointing to the most recent addition.
80 ColPartition_IT part_it_;
81 // The blocks that have been made so far and belong before the current block.
82 BLOCK_LIST completed_blocks_;
83 TO_BLOCK_LIST to_blocks_;
84 };
85
86 ELISTIZEH(WorkingPartSet)
87
88 } // namespace tesseract.
89
90 #endif // TESSERACT_TEXTORD_WORKINGPARSET_H__
91