FinderPatternFinder.h Example File

 // -*- mode:c++; tab-width:2; indent-tabs-mode:nil; c-basic-offset:2 -*-
 #ifndef __FINDER_PATTERN_FINDER_H__
 #define __FINDER_PATTERN_FINDER_H__

 /*
  *  FinderPatternFinder.h
  *  zxing
  *
  *  Copyright 2010 ZXing authors All rights reserved.
  *
  * 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 <zxing/qrcode/detector/FinderPattern.h>
 #include <zxing/qrcode/detector/FinderPatternInfo.h>
 #include <zxing/common/Counted.h>
 #include <zxing/common/BitMatrix.h>
 #include <zxing/ResultPointCallback.h>
 #include <vector>

 namespace zxing {

 class DecodeHints;

 namespace qrcode {

 class FinderPatternFinder {
 private:
   static int CENTER_QUORUM;

 protected:
   static int MIN_SKIP;
   static int MAX_MODULES;

   Ref<BitMatrix> image_;
   std::vector<Ref<FinderPattern> > possibleCenters_;
   bool hasSkipped_;

   Ref<ResultPointCallback> callback_;
   mutable int crossCheckStateCount[5];

   /** stateCount must be int[5] */
   static float centerFromEnd(int* stateCount, int end);
   static bool foundPatternCross(int* stateCount);

   float crossCheckVertical(size_t startI, size_t centerJ, int maxCount, int originalStateCountTotal);
   float crossCheckHorizontal(size_t startJ, size_t centerI, int maxCount, int originalStateCountTotal);

   /** stateCount must be int[5] */
   bool handlePossibleCenter(int* stateCount, size_t i, size_t j);
   int findRowSkip();
   bool haveMultiplyConfirmedCenters();
   std::vector<Ref<FinderPattern> > selectBestPatterns();
   static std::vector<Ref<FinderPattern> > orderBestPatterns(std::vector<Ref<FinderPattern> > patterns);

   Ref<BitMatrix> getImage();
   std::vector<Ref<FinderPattern> >& getPossibleCenters();

   bool crossCheckDiagonal(int startI, int centerJ, int maxCount, int originalStateCountTotal) const;
   int *getCrossCheckStateCount() const;

 public:
   static float distance(Ref<ResultPoint> p1, Ref<ResultPoint> p2);
   FinderPatternFinder(Ref<BitMatrix> image, Ref<ResultPointCallback>const&);
   Ref<FinderPatternInfo> find(DecodeHints const& hints);
 };
 }
 }

 #endif // __FINDER_PATTERN_FINDER_H__