textord/edgblob.h

/**********************************************************************
 * File:        edgblob.h  (Formerly edgeloop.h)
 * Description: Functions to clean up an outline before approximation.
 * Author:		Ray Smith
 * Created:		Tue Mar 26 16:56:25 GMT 1991
 *
 * (C) Copyright 1991, Hewlett-Packard Ltd.
 ** 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           EDGBLOB_H
#define           EDGBLOB_H

#ifndef GRAPHICS_DISABLED
#include          "scrollview.h"
#endif
#include          "varable.h"
#include          "img.h"
#include          "ocrblock.h"
#include          "coutln.h"
#include          "crakedge.h"
#include          "notdll.h"

#define BUCKETSIZE      16

class OL_BUCKETS
{
  public:
    OL_BUCKETS(               //constructor
               ICOORD bleft,  //corners
               ICOORD tright);

    ~OL_BUCKETS () {             //cleanup
      delete[]buckets;
    }
    C_OUTLINE_LIST *operator () (//array access
      inT16 x,                   //image coords
      inT16 y);
                                 //first non-empty bucket
    C_OUTLINE_LIST *start_scan() {
      for (index = 0; buckets[index].empty () && index < bxdim * bydim - 1;
        index++);
      return &buckets[index];
    }
                                 //next non-empty bucket
    C_OUTLINE_LIST *scan_next() {
      for (; buckets[index].empty () && index < bxdim * bydim - 1; index++);
      return &buckets[index];
    }
    inT32 count_children(                     //recursive sum
                         C_OUTLINE *outline,  //parent outline
                         inT32 max_count);    //max output
    void extract_children(                     //single level get
                          C_OUTLINE *outline,  //parent outline
                          C_OUTLINE_IT *it);   //destination iterator

  private:
    C_OUTLINE_LIST * buckets;    //array of buckets
    inT16 bxdim;                 //size of array
    inT16 bydim;
    ICOORD bl;                   //corners
    ICOORD tr;
    inT32 index;                 //for extraction scan
};

void extract_edges(                 //find blobs
#ifndef GRAPHICS_DISABLED
                   ScrollView* window,   //window for output
#endif
                   IMAGE *image,    //image to scan
                   IMAGE *t_image,  //thresholded image
                   ICOORD page_tr,  //corner of page
                   BLOCK *block     //block to scan
                  );
void outlines_to_blobs(               //find blobs
                       BLOCK *block,  //block to scan
                       ICOORD bleft,  //block box //outlines in block
                       ICOORD tright,
                       C_OUTLINE_LIST *outlines);
void fill_buckets(                           //find blobs
                  C_OUTLINE_LIST *outlines,  //outlines in block
                  OL_BUCKETS *buckets        //output buckets
                 );
void empty_buckets(                     //find blobs
                   BLOCK *block,        //block to scan
                   OL_BUCKETS *buckets  //output buckets
                  );
BOOL8 capture_children(                       //find children
                       OL_BUCKETS *buckets,   //bucket sort clanss
                       C_BLOB_IT *reject_it,  //dead grandchildren
                       C_OUTLINE_IT *blob_it  //output outlines
                      );
#endif