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85 lines
2.6 KiB
C++
85 lines
2.6 KiB
C++
/*
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* Copyright (C) 2007,2008 Alex Shulgin
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*
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* This file is part of png++ the C++ wrapper for libpng. PNG++ is free
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* software; the exact copying conditions are as follows:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef PNGPP_PACKED_PIXEL_HPP_INCLUDED
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#define PNGPP_PACKED_PIXEL_HPP_INCLUDED
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#include "types.hpp"
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namespace png
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{
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namespace detail
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{
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template< size_t bits > class allowed_bit_depth;
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template<> class allowed_bit_depth< 1 > {};
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template<> class allowed_bit_depth< 2 > {};
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template<> class allowed_bit_depth< 4 > {};
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} // namespace detail
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/**
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* \brief The packed pixel class template.
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*
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* \see packed_gray_pixel, packed_index_pixel
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*/
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template< size_t bits >
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class packed_pixel
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: detail::allowed_bit_depth< bits >
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{
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public:
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packed_pixel(byte value = 0)
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: m_value(value & get_bit_mask())
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{
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}
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operator byte() const
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{
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return m_value;
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}
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static size_t const get_bit_depth()
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{
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return bits;
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}
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static byte const get_bit_mask()
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{
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return (1 << bits) - 1;
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}
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private:
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byte m_value;
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};
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} // namespace png
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#endif // PNGPP_PACKED_PIXEL_HPP_INCLUDED
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