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# index_pixel.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_INDEX_PIXEL_HPP_INCLUDED
    00032 #define PNGPP_INDEX_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     class index_pixel
    00045     {
    00046     public:
    00047         index_pixel(byte index = 0)
    00048             : m_index(index)
    00049         {
    00050         }
    00051
    00052         operator byte() const
    00053         {
    00054             return m_index;
    00055         }
    00056
    00057     private:
    00058         byte m_index;
    00059     };
    00060
    00065     template< size_t bits >
    00066     class packed_index_pixel
    00067         : public packed_pixel< bits >
    00068     {
    00069     public:
    00070         packed_index_pixel(byte value = 0)
    00071             : packed_pixel< bits >(value)
    00072         {
    00073         }
    00074     };
    00075
    00079     typedef packed_index_pixel< 1 > index_pixel_1;
    00080
    00084     typedef packed_index_pixel< 2 > index_pixel_2;
    00085
    00089     typedef packed_index_pixel< 4 > index_pixel_4;
    00090
    00094     template<>
    00095     struct pixel_traits< index_pixel >
    00096         : basic_pixel_traits< index_pixel, byte, color_type_palette >
    00097     {
    00098     };
    00099
    00103     template< size_t bits >
    00104     struct pixel_traits< packed_index_pixel< bits > >
    00105         : basic_pixel_traits< packed_index_pixel< bits >, byte,
    00106                               color_type_palette, /* channels = */ 1, bits >
    00107     {
    00108     };
    00109
    00110 } // namespace png
    00111
    00112 #endif // PNGPP_INDEX_PIXEL_HPP_INCLUDED