streaming_base.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_STREAMING_BASE_HPP_INCLUDED
00032 #define PNGPP_STREAMING_BASE_HPP_INCLUDED
00033 
00034 #include <cassert>
00035 #include "image_info.hpp"
00036 #include "pixel_traits.hpp"
00037 
00038 namespace png
00039 {
00040 
00045     class def_image_info_holder
00046     {
00047     public:
00048         def_image_info_holder(image_info const& info)
00049             : m_info(info)
00050         {
00051         }
00052 
00053         image_info& get_info()
00054         {
00055             return m_info;
00056         }
00057 
00058     private:
00059         image_info m_info;
00060     };
00061 
00067     class image_info_ref_holder
00068     {
00069     public:
00070         image_info_ref_holder(image_info& info)
00071             : m_info(info)
00072         {
00073         }
00074 
00075         image_info& get_info()
00076         {
00077             return m_info;
00078         }
00079 
00080     private:
00081         image_info& m_info;
00082     };
00083 
00089     template< typename pixel, class info_holder >
00090     class streaming_base
00091     {
00092     public:
00093         typedef pixel_traits< pixel > traits;
00094 
00095         explicit streaming_base(image_info& info)
00096             : m_info_holder(info)
00097         {
00098         }
00099 
00100         streaming_base(size_t width, size_t height)
00101             : m_info_holder(make_image_info< pixel >())
00102         {
00103             get_info().set_width(width);
00104             get_info().set_height(height);
00105         }
00106 
00107         image_info const& get_info() const
00108         {
00109             return m_info_holder.get_info();
00110         }
00111 
00112     protected:
00113         void reset(size_t /*pass*/)
00114         {
00115             // nothing to do in the most general case
00116         }
00117 
00118         image_info& get_info()
00119         {
00120             return m_info_holder.get_info();
00121         }
00122 
00123         info_holder m_info_holder;
00124     };
00125 
00126 } // namespace png
00127 
00128 #endif // PNGPP_STREAMING_BASE_HPP_INCLUDED

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