gray_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_GRAY_PIXEL_HPP_INCLUDED
00032 #define PNGPP_GRAY_PIXEL_HPP_INCLUDED
00033 
00034 #include "types.hpp"
00035 #include "packed_pixel.hpp"
00036 #include "pixel_traits.hpp"
00037 
00038 namespace png
00039 {
00040 
00044     typedef byte gray_pixel;
00045 
00049     typedef uint_16 gray_pixel_16;
00050 
00055     template< size_t bits >
00056     class packed_gray_pixel
00057         : public packed_pixel< bits >
00058     {
00059     public:
00060         packed_gray_pixel(byte value = 0)
00061             : packed_pixel< bits >(value)
00062         {
00063         }
00064     };
00065 
00069     typedef packed_gray_pixel< 1 > gray_pixel_1;
00070 
00074     typedef packed_gray_pixel< 2 > gray_pixel_2;
00075 
00079     typedef packed_gray_pixel< 4 > gray_pixel_4;
00080 
00084     template<>
00085     struct pixel_traits< gray_pixel >
00086         : basic_pixel_traits< gray_pixel, byte, color_type_gray >
00087     {
00088     };
00089 
00093     template<>
00094     struct pixel_traits< gray_pixel_16 >
00095         : basic_pixel_traits< gray_pixel_16, uint_16, color_type_gray >
00096     {
00097     };
00098 
00102     template< size_t bits >
00103     struct pixel_traits< packed_gray_pixel< bits > >
00104         : basic_pixel_traits< packed_gray_pixel< bits >, byte,
00105                               color_type_gray, /* channels = */ 1, bits >
00106     {
00107     };
00108 
00109 } // namespace png
00110 
00111 #endif // PNGPP_GRAY_PIXEL_HPP_INCLUDED

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