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require_color_space.hpp

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00001 /*
00002  * Copyright (C) 2007,2008   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_REQUIRE_COLOR_SPACE_HPP_INCLUDED
00032 #define PNGPP_REQUIRE_COLOR_SPACE_HPP_INCLUDED
00033 
00034 #include "error.hpp"
00035 #include "rgb_pixel.hpp"
00036 #include "rgba_pixel.hpp"
00037 #include "gray_pixel.hpp"
00038 #include "ga_pixel.hpp"
00039 #include "index_pixel.hpp"
00040 #include "io_base.hpp"
00041 
00042 namespace png
00043 {
00044 
00045     namespace detail
00046     {
00047 
00048         template< typename pixel >
00049         struct wrong_color_space
00050         {
00051             inline static char const* error_msg();
00052         };
00053 
00054         template<> inline char const*
00055         wrong_color_space< rgb_pixel >::error_msg()
00056         {
00057             return "8-bit RGB color space required";
00058         }
00059 
00060         template<> inline char const*
00061         wrong_color_space< rgb_pixel_16 >::error_msg()
00062         {
00063             return "16-bit RGB color space required";
00064         }
00065 
00066         template<> inline char const*
00067         wrong_color_space< rgba_pixel >::error_msg()
00068         {
00069             return "8-bit RGBA color space required";
00070         }
00071 
00072         template<> inline char const*
00073         wrong_color_space< rgba_pixel_16 >::error_msg()
00074         {
00075             return "16-bit RGBA color space required";
00076         }
00077 
00078         template<> inline char const*
00079         wrong_color_space< gray_pixel >::error_msg()
00080         {
00081             return "8-bit Grayscale color space required";
00082         }
00083 
00084         template<> inline char const*
00085         wrong_color_space< gray_pixel_1 >::error_msg()
00086         {
00087             return "1-bit Grayscale color space required";
00088         }
00089 
00090         template<> inline char const*
00091         wrong_color_space< gray_pixel_2 >::error_msg()
00092         {
00093             return "2-bit Grayscale color space required";
00094         }
00095 
00096         template<> inline char const*
00097         wrong_color_space< gray_pixel_4 >::error_msg()
00098         {
00099             return "4-bit Grayscale color space required";
00100         }
00101 
00102         template<> inline char const*
00103         wrong_color_space< gray_pixel_16 >::error_msg()
00104         {
00105             return "16-bit Grayscale color space required";
00106         }
00107 
00108         template<> inline char const*
00109         wrong_color_space< ga_pixel >::error_msg()
00110         {
00111             return "8-bit Gray+Alpha color space required";
00112         }
00113 
00114         template<> inline char const*
00115         wrong_color_space< ga_pixel_16 >::error_msg()
00116         {
00117             return "16-bit Gray+Alpha color space required";
00118         }
00119 
00120         template<> inline char const*
00121         wrong_color_space< index_pixel >::error_msg()
00122         {
00123             return "8-bit Colormap color space required";
00124         }
00125 
00126         template<> inline char const*
00127         wrong_color_space< index_pixel_1 >::error_msg()
00128         {
00129             return "1-bit Colormap color space required";
00130         }
00131 
00132         template<> inline char const*
00133         wrong_color_space< index_pixel_2 >::error_msg()
00134         {
00135             return "2-bit Colormap color space required";
00136         }
00137 
00138         template<> inline char const*
00139         wrong_color_space< index_pixel_4 >::error_msg()
00140         {
00141             return "4-bit Colormap color space required";
00142         }
00143 
00144     } // namespace detail
00145 
00154     template< typename pixel >
00155     struct require_color_space
00156     {
00157         typedef pixel_traits< pixel > traits;
00158 
00159         void operator()(io_base& io) const
00160         {
00161             if (io.get_color_type() != traits::get_color_type()
00162                 || io.get_bit_depth() != traits::get_bit_depth())
00163             {
00164                 throw error(detail::wrong_color_space< pixel >::error_msg());
00165             }
00166         }
00167     };
00168 
00169 } // namespace png
00170 
00171 #endif // PNGPP_REQUIRE_COLOR_SPACE_HPP_INCLUDED

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