author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:01:42 +0200 | |
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// Copyright (C) 2005-2006 The Trustees of Indiana University. |
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// Distributed under the Boost Software License, Version 1.0. |
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// (See accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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// Authors: Jeremiah Willcock |
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// Douglas Gregor |
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// Andrew Lumsdaine |
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// Two bit per color property map |
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#ifndef BOOST_TWO_BIT_COLOR_MAP_HPP |
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#define BOOST_TWO_BIT_COLOR_MAP_HPP |
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#include <boost/property_map.hpp> |
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#include <boost/shared_array.hpp> |
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namespace boost { |
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enum two_bit_color_type { |
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two_bit_white = 0, |
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two_bit_gray = 1, |
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two_bit_green = 2, |
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two_bit_black = 3 |
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}; |
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template <> |
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struct color_traits<two_bit_color_type> |
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{ |
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static two_bit_color_type white() { return two_bit_white; } |
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static two_bit_color_type gray() { return two_bit_gray; } |
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static two_bit_color_type green() { return two_bit_green; } |
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static two_bit_color_type black() { return two_bit_black; } |
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}; |
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template<typename IndexMap = identity_property_map> |
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struct two_bit_color_map |
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{ |
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std::size_t n; |
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IndexMap index; |
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shared_array<unsigned char> data; |
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typedef typename property_traits<IndexMap>::key_type key_type; |
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typedef two_bit_color_type value_type; |
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typedef void reference; |
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typedef read_write_property_map_tag category; |
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explicit two_bit_color_map(std::size_t n, const IndexMap& index = IndexMap()) |
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: n(n), index(index), data(new unsigned char[(n + 3) / 4]) |
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{ |
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} |
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}; |
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template<typename IndexMap> |
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inline two_bit_color_type |
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get(const two_bit_color_map<IndexMap>& pm, |
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typename two_bit_color_map<IndexMap>::key_type key) |
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{ |
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typename property_traits<IndexMap>::value_type i = get(pm.index, key); |
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assert (i < pm.n); |
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return two_bit_color_type((pm.data.get()[i / 4] >> ((i % 4) * 2)) & 3); |
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} |
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template<typename IndexMap> |
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inline void |
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put(const two_bit_color_map<IndexMap>& pm, |
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typename two_bit_color_map<IndexMap>::key_type key, |
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two_bit_color_type value) |
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{ |
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typename property_traits<IndexMap>::value_type i = get(pm.index, key); |
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assert (i < pm.n); |
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assert (value >= 0 && value < 4); |
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std::size_t byte_num = i / 4; |
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std::size_t bit_position = ((i % 4) * 2); |
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pm.data.get()[byte_num] = (pm.data.get()[byte_num] & ~(3 << bit_position)) |
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| (value << bit_position); |
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} |
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template<typename IndexMap> |
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inline two_bit_color_map<IndexMap> |
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make_two_bit_color_map(std::size_t n, const IndexMap& index_map) |
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{ |
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return two_bit_color_map<IndexMap>(n, index_map); |
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} |
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} // end namespace boost |
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#endif // BOOST_TWO_BIT_COLOR_MAP_HPP |