BitMatrix.h Example File

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

 /*
  *  BitMatrix.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/common/Counted.h>
 #include <zxing/common/BitArray.h>
 #include <zxing/common/Array.h>
 #include <limits>

 namespace zxing {

 class BitMatrix : public Counted {
 public:
   static const int bitsPerWord = std::numeric_limits<unsigned int>::digits;

 private:
   int width;
   int height;
   int rowSize;
   ArrayRef<int> bits;

 //#define ZX_LOG_DIGITS(digits) \
 //    ((digits == 8) ? 3 : \
 //     ((digits == 16) ? 4 : \
 //      ((digits == 32) ? 5 : \
 //       ((digits == 64) ? 6 : \
 //        ((digits == 128) ? 7 : \
 //         (-1))))))

 //  static const int logBits = ZX_LOG_DIGITS(bitsPerWord);
 //  static const int bitsMask = (1 << logBits) - 1;

 public:
   BitMatrix(int dimension);
   BitMatrix(int width, int height);

   ~BitMatrix();

   bool get(int x, int y) const {
     int offset = y * rowSize + (x >> 5);
     return ((((unsigned)bits[offset]) >> (x & 0x1f)) & 1) != 0;
   }

   void set(int x, int y) {
     int offset = y * rowSize + (x >> 5);
     bits[offset] |= 1 << (x & 0x1f);
   }

   void flip(int x, int y);
   void rotate180();

   void clear();
   void setRegion(int left, int top, int width, int height);
   Ref<BitArray> getRow(int y, Ref<BitArray> row);
   void setRow(int y, Ref<BitArray> row);

   int getWidth() const;
   int getHeight() const;

   ArrayRef<int> getTopLeftOnBit() const;
   ArrayRef<int> getBottomRightOnBit() const;
   ArrayRef<int> getEnclosingRectangle() const;

   friend std::ostream& operator<<(std::ostream &out, const BitMatrix &bm);
   const char *description();

 private:
   inline void init(int, int);

   BitMatrix(const BitMatrix&);
   BitMatrix& operator =(const BitMatrix&);
 };

 }

 #endif // __BIT_MATRIX_H__