blocked_range2d.h

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/*
    Copyright (c) 2005-2020 Intel Corporation

    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 __TBB_blocked_range2d_H
#define __TBB_blocked_range2d_H

#include "tbb_stddef.h"
#include "blocked_range.h"

namespace tbb {


template<typename RowValue, typename ColValue=RowValue>
class blocked_range2d {
public:
    typedef blocked_range<RowValue> row_range_type;
    typedef blocked_range<ColValue> col_range_type;

private:
    row_range_type my_rows;
    col_range_type my_cols;

public:

    blocked_range2d( RowValue row_begin, RowValue row_end, typename row_range_type::size_type row_grainsize,
                     ColValue col_begin, ColValue col_end, typename col_range_type::size_type col_grainsize ) :
        my_rows(row_begin,row_end,row_grainsize),
        my_cols(col_begin,col_end,col_grainsize)
    {}

    blocked_range2d( RowValue row_begin, RowValue row_end,
                     ColValue col_begin, ColValue col_end ) :
        my_rows(row_begin,row_end),
        my_cols(col_begin,col_end)
    {}

    bool empty() const {
        // Range is empty if at least one dimension is empty.
        return my_rows.empty() || my_cols.empty();
    }

    bool is_divisible() const {
        return my_rows.is_divisible() || my_cols.is_divisible();
    }

    blocked_range2d( blocked_range2d& r, split ) :
        my_rows(r.my_rows),
        my_cols(r.my_cols)
    {
        split split_obj;
        do_split(r, split_obj);
    }

#if __TBB_USE_PROPORTIONAL_SPLIT_IN_BLOCKED_RANGES
    static const bool is_splittable_in_proportion = true;

    blocked_range2d( blocked_range2d& r, proportional_split& proportion ) :
        my_rows(r.my_rows),
        my_cols(r.my_cols)
    {
        do_split(r, proportion);
    }
#endif /* __TBB_USE_PROPORTIONAL_SPLIT_IN_BLOCKED_RANGES */

    const row_range_type& rows() const {return my_rows;}

    const col_range_type& cols() const {return my_cols;}

private:

    template <typename Split>
    void do_split( blocked_range2d& r, Split& split_obj )
    {
        if( my_rows.size()*double(my_cols.grainsize()) < my_cols.size()*double(my_rows.grainsize()) ) {
            my_cols.my_begin = col_range_type::do_split(r.my_cols, split_obj);
        } else {
            my_rows.my_begin = row_range_type::do_split(r.my_rows, split_obj);
        }
    }
};

} // namespace tbb

#endif /* __TBB_blocked_range2d_H */