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89 lines
3.6 KiB
C++
89 lines
3.6 KiB
C++
///////////////////////////////////////////////////////////////////////
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// File: workingpartset.h
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// Description: Class to hold a working set of partitions of the page
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// during construction of text/image regions.
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// Author: Ray Smith
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// Created: Tue Ocr 28 17:21:01 PDT 2008
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//
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// (C) Copyright 2008, Google Inc.
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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///////////////////////////////////////////////////////////////////////
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#ifndef TESSERACT_TEXTORD_WORKINGPARSET_H_
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#define TESSERACT_TEXTORD_WORKINGPARSET_H_
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#include "blobbox.h" // For TO_BLOCK_LIST and BLOCK_LIST.
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#include "colpartition.h" // For ColPartition_LIST.
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namespace tesseract {
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// WorkingPartSet holds a working set of ColPartitions during transformation
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// from the grid-based storage to regions in logical reading order, and is
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// therefore only used during construction of the regions.
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class WorkingPartSet : public ELIST_LINK {
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public:
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explicit WorkingPartSet(ColPartition* column)
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: column_(column), latest_part_(nullptr), part_it_(&part_set_) {
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}
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// Simple accessors.
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ColPartition* column() const {
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return column_;
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}
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void set_column(ColPartition* col) {
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column_ = col;
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}
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// Add the partition to this WorkingPartSet. Partitions are generally
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// stored in the order in which they are received, but if the partition
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// has a SingletonPartner, make sure that it stays with its partner.
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void AddPartition(ColPartition* part);
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// Make blocks out of any partitions in this WorkingPartSet, and append
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// them to the end of the blocks list. bleft, tright and resolution give
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// the bounds and resolution of the source image, so that blocks can be
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// made to fit in the bounds.
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// All ColPartitions go in the used_parts list, as they need to be kept
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// around, but are no longer needed.
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void ExtractCompletedBlocks(const ICOORD& bleft, const ICOORD& tright,
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int resolution, ColPartition_LIST* used_parts,
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BLOCK_LIST* blocks, TO_BLOCK_LIST* to_blocks);
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// Insert the given blocks at the front of the completed_blocks_ list so
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// they can be kept in the correct reading order.
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void InsertCompletedBlocks(BLOCK_LIST* blocks, TO_BLOCK_LIST* to_blocks);
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private:
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// Convert the part_set_ into blocks, starting a new block at a break
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// in partnerships, or a change in linespacing (for text).
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void MakeBlocks(const ICOORD& bleft, const ICOORD& tright, int resolution,
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ColPartition_LIST* used_parts);
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// The column that this working set applies to. Used by the caller.
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ColPartition* column_;
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// The most recently added partition.
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ColPartition* latest_part_;
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// All the partitions in the block that is currently under construction.
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ColPartition_LIST part_set_;
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// Iteratorn on part_set_ pointing to the most recent addition.
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ColPartition_IT part_it_;
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// The blocks that have been made so far and belong before the current block.
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BLOCK_LIST completed_blocks_;
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TO_BLOCK_LIST to_blocks_;
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};
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ELISTIZEH(WorkingPartSet)
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} // namespace tesseract.
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#endif // TESSERACT_TEXTORD_WORKINGPARSET_H_
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