boxword.h

// File:        boxword.h
// Description: Class to represent the bounding boxes of the output.
// Author:      Ray Smith
// Created:     Tue May 25 14:18:14 PDT 2010
//
// (C) Copyright 2010, Google Inc.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

#ifndef TESSERACT_CSTRUCT_BOXWORD_H_
#define TESSERACT_CSTRUCT_BOXWORD_H_

#include "genericvector.h"  // for GenericVector
#include "rect.h"           // for TBOX

class BLOCK;
class WERD;

struct TWERD;

template <class A1> class TessCallback1;

namespace tesseract {

// Class to hold an array of bounding boxes for an output word and
// the bounding box of the whole word.
class BoxWord {
 public:
  BoxWord();
  explicit BoxWord(const BoxWord& src);
  ~BoxWord() = default;

  BoxWord& operator=(const BoxWord& src);

  void CopyFrom(const BoxWord& src);

  // Factory to build a BoxWord from a TWERD using the DENORMs on each blob to
  // switch back to original image coordinates.
  static BoxWord* CopyFromNormalized(TWERD* tessword);

  // Clean up the bounding boxes from the polygonal approximation by
  // expanding slightly, then clipping to the blobs from the original_word
  // that overlap. If not null, the block provides the inverse rotation.
  void ClipToOriginalWord(const BLOCK* block, WERD* original_word);

  // Merges the boxes from start to end, not including end, and deletes
  // the boxes between start and end.
  void MergeBoxes(int start, int end);

  // Inserts a new box before the given index.
  // Recomputes the bounding box.
  void InsertBox(int index, const TBOX& box);

  // Changes the box at the given index to the new box.
  // Recomputes the bounding box.
  void ChangeBox(int index, const TBOX& box);

  // Deletes the box with the given index, and shuffles up the rest.
  // Recomputes the bounding box.
  void DeleteBox(int index);

  // Deletes all the boxes stored in BoxWord.
  void DeleteAllBoxes();

  // This and other putatively are the same, so call the (permanent) callback
  // for each blob index where the bounding boxes match.
  // The callback is deleted on completion.
  void ProcessMatchedBlobs(const TWERD& other, TessCallback1<int>* cb) const;

  const TBOX& bounding_box() const {
    return bbox_;
  }
  int length() const { return length_; }
  const TBOX& BlobBox(int index) const {
    return boxes_[index];
  }

 private:
  void ComputeBoundingBox();

  TBOX bbox_;
  int length_;
  GenericVector<TBOX> boxes_;
};

}  // namespace tesseract.

#endif  // TESSERACT_CSTRUCT_BOXWORD_H_