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103 lines
3.4 KiB
C++
103 lines
3.4 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_PIXEL_TRAITS_HPP_INCLUDED
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#define PNGPP_PIXEL_TRAITS_HPP_INCLUDED
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#include <limits>
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#include "types.hpp"
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namespace png
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{
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/**
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* \brief Pixel traits class template.
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*
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* Provides information about pixel color type and components bit depth.
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* Not implemented--see specializations.
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*
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* \see pixel_traits<rgb_pixel>, pixel_traits<rgba_pixel>
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*/
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template< typename pixel > struct pixel_traits;
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/**
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* \brief Basic pixel traits class template.
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*
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* Provides common implementation for various pixel_traits<>
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* specializations.
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*/
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template< typename pixel,
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typename component,
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color_type pixel_color_type,
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int channels_value = sizeof(pixel) / sizeof(component),
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int bit_depth_value = std::numeric_limits< component >::digits >
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struct basic_pixel_traits
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{
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typedef pixel pixel_type;
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typedef component component_type;
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static color_type get_color_type()
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{
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return pixel_color_type;
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}
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static const int channels = channels_value;
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static int get_channels()
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{
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return channels;
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}
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static const int bit_depth = bit_depth_value;
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static int get_bit_depth()
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{
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return bit_depth;
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}
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};
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/**
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* \brief Basic pixel traits class template for pixels with alpha
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* channel.
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*/
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template< typename component >
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struct basic_alpha_pixel_traits
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{
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/**
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* \brief Returns the default alpha channel filler for full
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* opacity.
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*/
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static component get_alpha_filler()
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{
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return std::numeric_limits< component >::max();
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}
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};
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} // namespace png
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#endif // PNGPP_PIXEL_TRAITS_HPP_INCLUDED
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