png++  0.2.9
ga_pixel.hpp
Go to the documentation of this file.
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 >
47  {
49 
56  : value(value), alpha(alpha)
57  {
58  }
59 
60  T value;
61  T alpha;
62  };
63 
68 
73 
77  template< typename T >
79  : basic_pixel_traits< basic_ga_pixel< T >, T, color_type_ga >,
81  {
82  };
83 
84 } // namespace png
85 
86 #endif // PNGPP_GA_PIXEL_HPP_INCLUDED
basic_ga_pixel< byte > ga_pixel
The 8-bit Gray+Alpha pixel type.
Definition: ga_pixel.hpp:67
T value
Definition: ga_pixel.hpp:60
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. Alpha defaults to full opacity.
Definition: ga_pixel.hpp:55
Basic Gray+Alpha pixel type.
Definition: ga_pixel.hpp:46
pixel_traits< basic_ga_pixel< T > > traits
Definition: ga_pixel.hpp:48
Pixel traits class template.
Definition: pixel_traits.hpp:48
T alpha
Definition: ga_pixel.hpp:61
static T 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:61
Definition: color.hpp:36
basic_ga_pixel< uint_16 > ga_pixel_16
The 16-bit Gray+Alpha pixel type.
Definition: ga_pixel.hpp:72
Basic pixel traits class template for pixels with alpha channel.
Definition: pixel_traits.hpp:89