pixel_traits.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_PIXEL_TRAITS_HPP_INCLUDED
00032 #define PNGPP_PIXEL_TRAITS_HPP_INCLUDED
00033 
00034 #include <limits>
00035 #include "types.hpp"
00036 
00037 namespace png
00038 {
00039 
00048     template< typename pixel > struct pixel_traits;
00049 
00056     template< typename pixel,
00057               typename component,
00058               color_type pixel_color_type,
00059               size_t channels = sizeof(pixel) / sizeof(component),
00060               size_t bit_depth = std::numeric_limits< component >::digits >
00061     struct basic_pixel_traits
00062     {
00063         typedef pixel pixel_type;
00064         typedef component component_type;
00065 
00066         static color_type get_color_type()
00067         {
00068             return pixel_color_type;
00069         }
00070         static size_t get_channels()
00071         {
00072             return channels;
00073         }
00074         static size_t get_bit_depth()
00075         {
00076             return bit_depth;
00077         }
00078     };
00079 
00084     template< typename component >
00085     struct basic_alpha_pixel_traits
00086     {
00091         static component get_alpha_filler()
00092         {
00093             return std::numeric_limits< component >::max();
00094         }
00095     };
00096 
00097 } // namespace png
00098 
00099 #endif // PNGPP_PIXEL_TRAITS_HPP_INCLUDED

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