png++: ga_pixel.hpp Source File

png++ 0.2.10

ga_pixel.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_GA_PIXEL_HPP_INCLUDED
32 #define PNGPP_GA_PIXEL_HPP_INCLUDED
33
34 #include <limits>
35
36 #include "types.hpp"
37 #include "pixel_traits.hpp"
38
39 namespace png
40 {
41
45 template< typename T >
46 struct basic_ga_pixel
47 {
48 typedef pixel_traits< basic_ga_pixel< T > > traits;
49
55 basic_ga_pixel(T value = 0, T alpha = traits::get_alpha_filler())
56 : value(value), alpha(alpha)
57 {
58 }
59
60 T value;
61 T alpha;
62 };
63
67 typedef basic_ga_pixel< byte > ga_pixel;
68
72 typedef basic_ga_pixel< uint_16 > ga_pixel_16;
73
77 template< typename T >
78 struct pixel_traits< basic_ga_pixel< T > >
79 : basic_pixel_traits< basic_ga_pixel< T >, T, color_type_ga >,
80 basic_alpha_pixel_traits< T >
81 {
82 };
83
84 } // namespace png
85
86 #endif // PNGPP_GA_PIXEL_HPP_INCLUDED
png::ga_pixel
basic_ga_pixel< byte > ga_pixel
The 8-bit Gray+Alpha pixel type.
Definition: ga_pixel.hpp:67
png::basic_ga_pixel::value
T value
Definition: ga_pixel.hpp:60
png::basic_ga_pixel::basic_ga_pixel
basic_ga_pixel(T value=0, T alpha=traits::get_alpha_filler())
Constructs basic_ga_pixel object from value and alpha components passed as parameters....
Definition: ga_pixel.hpp:55
png::basic_ga_pixel
Basic Gray+Alpha pixel type.
Definition: ga_pixel.hpp:46
pixel_traits.hpp
png::basic_ga_pixel::traits
pixel_traits< basic_ga_pixel< T > > traits
Definition: ga_pixel.hpp:48
png::pixel_traits
Pixel traits class template.
Definition: pixel_traits.hpp:48
types.hpp
png::basic_ga_pixel::alpha
T alpha
Definition: ga_pixel.hpp:61
png::basic_alpha_pixel_traits< T >::get_alpha_filler
static T 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:61
png
Definition: color.hpp:36
png::ga_pixel_16
basic_ga_pixel< uint_16 > ga_pixel_16
The 16-bit Gray+Alpha pixel type.
Definition: ga_pixel.hpp:72
png::basic_alpha_pixel_traits
Basic pixel traits class template for pixels with alpha channel.
Definition: pixel_traits.hpp:89