blread.cpp

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/**********************************************************************
 * File:        blread.cpp  (Formerly pdread.c)
 * Description: Friend function of BLOCK to read the uscan pd file.
 * Author:      Ray Smith
 *
 * (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.
 *
 **********************************************************************/
 
#include "blread.h"
 
#include "ocrblock.h"  // for BLOCK_IT, BLOCK, BLOCK_LIST (ptr only)
#include "scanutils.h" // for tfscanf
 
#include <cstdio> // for fclose, fopen, FILE
 
namespace tesseract {
 
#define UNLV_EXT ".uzn" // unlv zone file
 
/**********************************************************************
 * read_unlv_file
 *
 * Read a whole unlv zone file to make a list of blocks.
 **********************************************************************/
 
bool read_unlv_file(   // print list of sides
    std::string &name, // basename of file
    int32_t xsize,     // image size
    int32_t ysize,     // image size
    BLOCK_LIST *blocks // output list
) {
  FILE *pdfp;   // file pointer
  BLOCK *block; // current block
  int x;        // current top-down coords
  int y;
  int width; // of current block
  int height;
  BLOCK_IT block_it = blocks; // block iterator
 
  name += UNLV_EXT; // add extension
  if ((pdfp = fopen(name.c_str(), "rb")) == nullptr) {
    return false; // didn't read one
  } else {
    while (tfscanf(pdfp, "%d %d %d %d %*s", &x, &y, &width, &height) >= 4) {
      // make rect block
      block = new BLOCK(name.c_str(), true, 0, 0, static_cast<int16_t>(x),
                        static_cast<int16_t>(ysize - y - height), static_cast<int16_t>(x + width),
                        static_cast<int16_t>(ysize - y));
      // on end of list
      block_it.add_to_end(block);
    }
    fclose(pdfp);
  }
  tprintf("UZN file %s loaded.\n", name.c_str());
  return true;
}
 
void FullPageBlock(int width, int height, BLOCK_LIST *blocks) {
  BLOCK_IT block_it(blocks);
  auto *block = new BLOCK("", true, 0, 0, 0, 0, width, height);
  block_it.add_to_end(block);
}
 
} // namespace tesseract