tesseract  5.0.0
blread.cpp
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1 /**********************************************************************
2  * File: blread.cpp (Formerly pdread.c)
3  * Description: Friend function of BLOCK to read the uscan pd file.
4  * Author: Ray Smith
5  *
6  * (C) Copyright 1991, Hewlett-Packard Ltd.
7  ** Licensed under the Apache License, Version 2.0 (the "License");
8  ** you may not use this file except in compliance with the License.
9  ** You may obtain a copy of the License at
10  ** http://www.apache.org/licenses/LICENSE-2.0
11  ** Unless required by applicable law or agreed to in writing, software
12  ** distributed under the License is distributed on an "AS IS" BASIS,
13  ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  ** See the License for the specific language governing permissions and
15  ** limitations under the License.
16  *
17  **********************************************************************/
18 
19 #include "blread.h"
20 
21 #include "ocrblock.h" // for BLOCK_IT, BLOCK, BLOCK_LIST (ptr only)
22 #include "scanutils.h" // for tfscanf
23 
24 #include <cstdio> // for fclose, fopen, FILE
25 
26 namespace tesseract {
27 
28 #define UNLV_EXT ".uzn" // unlv zone file
29 
30 /**********************************************************************
31  * read_unlv_file
32  *
33  * Read a whole unlv zone file to make a list of blocks.
34  **********************************************************************/
35 
36 bool read_unlv_file( // print list of sides
37  std::string &name, // basename of file
38  int32_t xsize, // image size
39  int32_t ysize, // image size
40  BLOCK_LIST *blocks // output list
41 ) {
42  FILE *pdfp; // file pointer
43  BLOCK *block; // current block
44  int x; // current top-down coords
45  int y;
46  int width; // of current block
47  int height;
48  BLOCK_IT block_it = blocks; // block iterator
49 
50  name += UNLV_EXT; // add extension
51  if ((pdfp = fopen(name.c_str(), "rb")) == nullptr) {
52  return false; // didn't read one
53  } else {
54  while (tfscanf(pdfp, "%d %d %d %d %*s", &x, &y, &width, &height) >= 4) {
55  // make rect block
56  block = new BLOCK(name.c_str(), true, 0, 0, static_cast<int16_t>(x),
57  static_cast<int16_t>(ysize - y - height), static_cast<int16_t>(x + width),
58  static_cast<int16_t>(ysize - y));
59  // on end of list
60  block_it.add_to_end(block);
61  }
62  fclose(pdfp);
63  }
64  tprintf("UZN file %s loaded.\n", name.c_str());
65  return true;
66 }
67 
68 void FullPageBlock(int width, int height, BLOCK_LIST *blocks) {
69  BLOCK_IT block_it(blocks);
70  auto *block = new BLOCK("", true, 0, 0, 0, 0, width, height);
71  block_it.add_to_end(block);
72 }
73 
74 } // namespace tesseract
#define UNLV_EXT
Definition: blread.cpp:28
int tfscanf(FILE *stream, const char *format,...)
Definition: scanutils.cpp:189
bool read_unlv_file(std::string &name, int32_t xsize, int32_t ysize, BLOCK_LIST *blocks)
Definition: blread.cpp:36
void tprintf(const char *format,...)
Definition: tprintf.cpp:41
void FullPageBlock(int width, int height, BLOCK_LIST *blocks)
Definition: blread.cpp:68