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.
12 *
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 *
17 * 3. The name of the author may not be used to endorse or promote products
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
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
23 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
25 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31 #ifndef PNGPP_PIXEL_TRAITS_HPP_INCLUDED
32 #define PNGPP_PIXEL_TRAITS_HPP_INCLUDED
33
34 #include <limits>
35 #include "types.hpp"
36
37 namespace 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::basic_pixel_traits::get_color_type
static color_type get_color_type()
Definition: pixel_traits.hpp:66
types.hpp
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_pixel_traits::channels
static const int channels
Definition: pixel_traits.hpp:71
png::pixel_traits
Pixel traits class template.
Definition: pixel_traits.hpp:48
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::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::bit_depth
static const int bit_depth
Definition: pixel_traits.hpp:77
png
Definition: color.hpp:37
png::basic_pixel_traits::get_channels
static int get_channels()
Definition: pixel_traits.hpp:72