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129 lines
3.6 KiB
C++
129 lines
3.6 KiB
C++
/*
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* Copyright (C) 2007,2008 Alex Shulgin
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*
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* This file is part of png++ the C++ wrapper for libpng. PNG++ is free
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* software; the exact copying conditions are as follows:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef PNGPP_STREAMING_BASE_HPP_INCLUDED
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#define PNGPP_STREAMING_BASE_HPP_INCLUDED
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#include <cassert>
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#include "image_info.hpp"
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#include "pixel_traits.hpp"
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namespace png
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{
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/**
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* \brief The default image_info holder class. Stores image_info
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* member object.
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*/
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class def_image_info_holder
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{
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public:
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def_image_info_holder(image_info const& info)
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: m_info(info)
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{
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}
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image_info& get_info()
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{
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return m_info;
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}
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private:
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image_info m_info;
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};
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/**
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* \brief An image_info holder class. Stores a reference to the
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* image_info object. The image_info object itself should be
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* stored elsewhere.
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*/
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class image_info_ref_holder
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{
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public:
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image_info_ref_holder(image_info& info)
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: m_info(info)
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{
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}
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image_info& get_info()
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{
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return m_info;
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}
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private:
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image_info& m_info;
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};
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/**
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* \brief A base class template for consumer and generator
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* classes. Provides default \c reset() method implementation as
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* well as \c info_holder policy.
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*/
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template< typename pixel, class info_holder >
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class streaming_base
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{
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public:
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typedef pixel_traits< pixel > traits;
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explicit streaming_base(image_info& info)
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: m_info_holder(info)
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{
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}
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streaming_base(size_t width, size_t height)
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: m_info_holder(make_image_info< pixel >())
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{
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get_info().set_width(width);
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get_info().set_height(height);
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}
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image_info const& get_info() const
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{
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return m_info_holder.get_info();
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}
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protected:
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void reset(size_t /*pass*/)
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{
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// nothing to do in the most general case
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}
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image_info& get_info()
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{
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return m_info_holder.get_info();
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}
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info_holder m_info_holder;
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};
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} // namespace png
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#endif // PNGPP_STREAMING_BASE_HPP_INCLUDED
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