pixel_traits.hpp
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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
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*/
#ifndef PNGPP_PIXEL_TRAITS_HPP_INCLUDED
#define PNGPP_PIXEL_TRAITS_HPP_INCLUDED
#include <limits>
#include "types.hpp"
namespace png
{
template< typename pixel > struct pixel_traits;
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;
}
};
template< typename component >
struct basic_alpha_pixel_traits
{
static component get_alpha_filler()
{
return std::numeric_limits< component >::max();
}
};
} // namespace png
#endif // PNGPP_PIXEL_TRAITS_HPP_INCLUDED
png::reader
The PNG reader class template. This is the low-level reading interface–use image class or consumer cl...
Definition reader.hpp:67
png
Definition color.hpp:37
png::color_type
color_type
Definition types.hpp:47
png::basic_alpha_pixel_traits
Basic pixel traits class template for pixels with alpha channel.
Definition pixel_traits.hpp:90
png::basic_alpha_pixel_traits::get_alpha_filler
static component get_alpha_filler()
Returns the default alpha channel filler for full opacity.
Definition pixel_traits.hpp:95
png::basic_pixel_traits
Basic pixel traits class template.
Definition pixel_traits.hpp:62
png::basic_pixel_traits::component_type
component component_type
Definition pixel_traits.hpp:64
png::basic_pixel_traits::bit_depth
static const int bit_depth
Definition pixel_traits.hpp:77
png::basic_pixel_traits::get_bit_depth
static int get_bit_depth()
Definition pixel_traits.hpp:78
png::basic_pixel_traits::pixel_type
pixel pixel_type
Definition pixel_traits.hpp:63
png::basic_pixel_traits::get_color_type
static color_type get_color_type()
Definition pixel_traits.hpp:66
png::basic_pixel_traits::channels
static const int channels
Definition pixel_traits.hpp:71
png::basic_pixel_traits::get_channels
static int get_channels()
Definition pixel_traits.hpp:72
png::pixel_traits
Pixel traits class template.
Definition pixel_traits.hpp:48
types.hpp