ga_pixel.hpp

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00001 /*
00002  * Copyright (C) 2007   Alex Shulgin
00003  *
00004  * This file is part of png++ the C++ wrapper for libpng.  Png++ is free
00005  * software; the exact copying conditions are as follows:
00006  *
00007  * Redistribution and use in source and binary forms, with or without
00008  * modification, are permitted provided that the following conditions are met:
00009  *
00010  * 1. Redistributions of source code must retain the above copyright notice,
00011  * this list of conditions and the following disclaimer.
00012  *
00013  * 2. Redistributions in binary form must reproduce the above copyright
00014  * notice, this list of conditions and the following disclaimer in the
00015  * documentation and/or other materials provided with the distribution.
00016  *
00017  * 3. The name of the author may not be used to endorse or promote products
00018  * derived from this software without specific prior written permission.
00019  *
00020  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
00021  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00022  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
00023  * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00024  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
00025  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00026  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00027  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00028  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00029  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00030  */
00031 #ifndef PNGPP_GA_PIXEL_HPP_INCLUDED
00032 #define PNGPP_GA_PIXEL_HPP_INCLUDED
00033 
00034 #include <limits>
00035 
00036 #include "types.hpp"
00037 #include "pixel_traits.hpp"
00038 
00039 namespace png
00040 {
00041 
00045     template< typename T >
00046     struct basic_ga_pixel
00047     {
00048         typedef pixel_traits< basic_ga_pixel< T > > traits;
00049 
00055         basic_ga_pixel(T value = 0, T alpha = traits::get_alpha_filler())
00056             : value(value), alpha(alpha)
00057         {
00058         }
00059 
00060         T value;
00061         T alpha;
00062     };
00063 
00067     typedef basic_ga_pixel< byte > ga_pixel;
00068 
00072     typedef basic_ga_pixel< uint_16 > ga_pixel_16;
00073 
00077     template< typename T >
00078     struct pixel_traits< basic_ga_pixel< T > >
00079         : basic_pixel_traits< basic_ga_pixel< T >, T, color_type_ga >,
00080           basic_alpha_pixel_traits< T >
00081     {
00082     };
00083 
00084 } // namespace png
00085 
00086 #endif // PNGPP_GA_PIXEL_HPP_INCLUDED

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