// -*- mode:c++; tab-width:2; indent-tabs-mode:nil; c-basic-offset:2 -*-
#ifndef __HYBRIDBINARIZER_H__
#define __HYBRIDBINARIZER_H__
/*
 *  HybridBinarizer.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 <vector>
#include <zxing/Binarizer.h>
#include <zxing/common/GlobalHistogramBinarizer.h>
#include <zxing/common/BitArray.h>
#include <zxing/common/BitMatrix.h>

namespace zxing {

    class HybridBinarizer : public GlobalHistogramBinarizer {
    private:
        Ref<BitMatrix> matrix_;
        Ref<BitArray> cached_row_;

    public:
        HybridBinarizer(Ref<LuminanceSource> source);
        virtual ~HybridBinarizer();

        virtual Ref<BitMatrix> getBlackMatrix();
        Ref<Binarizer> createBinarizer(Ref<LuminanceSource> source);
    private:
        // We'll be using one-D arrays because C++ can't dynamically allocate 2D
        // arrays
        ArrayRef<int> calculateBlackPoints(ArrayRef<char> luminances,
            int subWidth,
            int subHeight,
            int width,
            int height);
        void calculateThresholdForBlock(ArrayRef<char> luminances,
            int subWidth,
            int subHeight,
            int width,
            int height,
            ArrayRef<int> blackPoints,
            Ref<BitMatrix> const& matrix);
        void thresholdBlock(ArrayRef<char>luminances,
            int xoffset,
            int yoffset,
            int threshold,
            int stride,
            Ref<BitMatrix> const& matrix);
    };

}

#endif