githubmirror/tesseract

src/ccstruct/ccstruct.h
40 строк2 KB
Stefan Weil
Use more `constexpr`
18 июн 2026, 18:34
18 июн 2026, 18:34b1cbc63
///////////////////////////////////////////////////////////////////////
// File:        ccstruct.h
// Description: ccstruct class.
// Author:      Samuel Charron
//
// (C) Copyright 2006, 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_CCSTRUCT_CCSTRUCT_H_
#define TESSERACT_CCSTRUCT_CCSTRUCT_H_

#include "ccutil.h" // for CCUtil

namespace tesseract {

class CCStruct : public CCUtil {
public:
  // Globally accessible constants.
  // APPROXIMATIONS of the fractions of the character cell taken by
  // the descenders, ascenders, and x-height.
  static constexpr double kDescenderFraction = 0.25;
  static constexpr double kXHeightFraction = 0.5;
  static constexpr double kAscenderFraction = 0.25;
  // Derived value giving the x-height as a fraction of cap-height.
  static constexpr double kXHeightCapRatio = kXHeightFraction / (kXHeightFraction + kAscenderFraction);
};

} // namespace tesseract

#endif // TESSERACT_CCSTRUCT_CCSTRUCT_H_