png++ 0.2.10
pixel_traits.hpp
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1/*
2 * Copyright (C) 2007,2008 Alex Shulgin
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4 * This file is part of png++ the C++ wrapper for libpng. PNG++ is free
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31#ifndef PNGPP_PIXEL_TRAITS_HPP_INCLUDED
32#define PNGPP_PIXEL_TRAITS_HPP_INCLUDED
33
34#include <limits>
35#include "types.hpp"
36
37namespace png
38{
39
48 template< typename pixel > struct pixel_traits;
49
56 template< typename pixel,
57 typename component,
58 color_type pixel_color_type,
59 int channels_value = sizeof(pixel) / sizeof(component),
60 int bit_depth_value = std::numeric_limits< component >::digits >
62 {
63 typedef pixel pixel_type;
64 typedef component component_type;
65
67 {
68 return pixel_color_type;
69 }
70
71 static const int channels = channels_value;
72 static int get_channels()
73 {
74 return channels;
75 }
76
77 static const int bit_depth = bit_depth_value;
78 static int get_bit_depth()
79 {
80 return bit_depth;
81 }
82 };
83
88 template< typename component >
90 {
95 static component get_alpha_filler()
96 {
97 return std::numeric_limits< component >::max();
98 }
99 };
100
101} // namespace png
102
103#endif // PNGPP_PIXEL_TRAITS_HPP_INCLUDED
Definition color.hpp:37
color_type
Definition types.hpp:47
Basic pixel traits class template for pixels with alpha channel.
Definition pixel_traits.hpp:90
static component get_alpha_filler()
Returns the default alpha channel filler for full opacity.
Definition pixel_traits.hpp:95
Basic pixel traits class template.
Definition pixel_traits.hpp:62
component component_type
Definition pixel_traits.hpp:64
static const int bit_depth
Definition pixel_traits.hpp:77
static int get_bit_depth()
Definition pixel_traits.hpp:78
pixel pixel_type
Definition pixel_traits.hpp:63
static color_type get_color_type()
Definition pixel_traits.hpp:66
static const int channels
Definition pixel_traits.hpp:71
static int get_channels()
Definition pixel_traits.hpp:72
Pixel traits class template.
Definition pixel_traits.hpp:48