ocrfeatures.cpp

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/******************************************************************************
 ** Filename:    ocrfeatures.cpp
 ** Purpose:     Generic definition of a feature.
 ** Author:      Dan Johnson
 **
 ** (c) Copyright Hewlett-Packard Company, 1988.
 ** 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 "ocrfeatures.h"
 
#include "scanutils.h"
 
#include <cassert>
#include <cmath>
#include <sstream> // for std::stringstream
 
namespace tesseract {
 
/*----------------------------------------------------------------------------
              Public Code
----------------------------------------------------------------------------*/
bool AddFeature(FEATURE_SET FeatureSet, FEATURE Feature) {
  if (FeatureSet->NumFeatures >= FeatureSet->MaxNumFeatures) {
    delete Feature;
    return false;
  }
 
  FeatureSet->Features[FeatureSet->NumFeatures++] = Feature;
  return true;
} /* AddFeature */
 
static FEATURE ReadFeature(FILE *File, const FEATURE_DESC_STRUCT *FeatureDesc) {
  auto Feature = new FEATURE_STRUCT(FeatureDesc);
  for (int i = 0; i < Feature->Type->NumParams; i++) {
    ASSERT_HOST(tfscanf(File, "%f", &(Feature->Params[i])) == 1);
#ifndef _WIN32
    assert(!std::isnan(Feature->Params[i]));
#endif
  }
  return Feature;
}
 
FEATURE_SET ReadFeatureSet(FILE *File, const FEATURE_DESC_STRUCT *FeatureDesc) {
  int NumFeatures;
  ASSERT_HOST(tfscanf(File, "%d", &NumFeatures) == 1);
  ASSERT_HOST(NumFeatures >= 0);
 
  auto FeatureSet = new FEATURE_SET_STRUCT(NumFeatures);
  for (int i = 0; i < NumFeatures; i++) {
    AddFeature(FeatureSet, ReadFeature(File, FeatureDesc));
  }
 
  return FeatureSet;
}
 
static void WriteFeature(FEATURE Feature, std::string &str) {
  for (int i = 0; i < Feature->Type->NumParams; i++) {
#ifndef WIN32
    assert(!std::isnan(Feature->Params[i]));
#endif
    std::stringstream stream;
    // Use "C" locale (needed for double value).
    stream.imbue(std::locale::classic());
    // Use 8 digits for double value.
    stream.precision(8);
    stream << Feature->Params[i];
    str += " " + stream.str();
  }
  str += "\n";
} /* WriteFeature */
 
void WriteFeatureSet(FEATURE_SET FeatureSet, std::string &str) {
  if (FeatureSet) {
    str += "" + std::to_string(FeatureSet->NumFeatures);
    str += "\n";
    for (int i = 0; i < FeatureSet->NumFeatures; i++) {
      WriteFeature(FeatureSet->Features[i], str);
    }
  }
} /* WriteFeatureSet */
 
} // namespace tesseract