png++: pixel_traits.hpp Source File

png++ 0.2.10

pixel_traits.hpp
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1/*
2 * Copyright (C) 2007,2008 Alex Shulgin
3 *
4 * This file is part of png++ the C++ wrapper for libpng. PNG++ is free
5 * software; the exact copying conditions are as follows:
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
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13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
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18 * derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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30 */
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 >
61 struct basic_pixel_traits
62 {
63 typedef pixel pixel_type;
64 typedef component component_type;
65
66 static color_type get_color_type()
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 >
89 struct basic_alpha_pixel_traits
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
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