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/*
* Copyright (C) 2007,2008 Alex Shulgin
*
* This file is part of png++ the C++ wrapper for libpng. PNG++ is free
* software; the exact copying conditions are as follows:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef PNGPP_PIXEL_TRAITS_HPP_INCLUDED
#define PNGPP_PIXEL_TRAITS_HPP_INCLUDED
#include <limits>
#include "types.hpp"
namespace png
{
/**
* \brief Pixel traits class template.
*
* Provides information about pixel color type and components bit depth.
* Not implemented--see specializations.
*
* \see pixel_traits<rgb_pixel>, pixel_traits<rgba_pixel>
*/
template< typename pixel > struct pixel_traits;
/**
* \brief Basic pixel traits class template.
*
* Provides common implementation for various pixel_traits<>
* specializations.
*/
template< typename pixel,
typename component,
color_type pixel_color_type,
int channels_value = sizeof(pixel) / sizeof(component),
int bit_depth_value = std::numeric_limits< component >::digits >
struct basic_pixel_traits
{
typedef pixel pixel_type;
typedef component component_type;
static color_type get_color_type()
{
return pixel_color_type;
}
static const int channels = channels_value;
static int get_channels()
{
return channels;
}
static const int bit_depth = bit_depth_value;
static int get_bit_depth()
{
return bit_depth;
}
};
/**
* \brief Basic pixel traits class template for pixels with alpha
* channel.
*/
template< typename component >
struct basic_alpha_pixel_traits
{
/**
* \brief Returns the default alpha channel filler for full
* opacity.
*/
static component get_alpha_filler()
{
return std::numeric_limits< component >::max();
}
};
} // namespace png
#endif // PNGPP_PIXEL_TRAITS_HPP_INCLUDED
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