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streaming_base.hpp
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streaming_base.hpp
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/*
* Copyright (C) 2007,2008 Alex Shulgin
*
* This file is part of png++ the C++ wrapper for libpng. PNG++ is free
* software; the exact copying conditions are as follows:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef PNGPP_STREAMING_BASE_HPP_INCLUDED
#define PNGPP_STREAMING_BASE_HPP_INCLUDED
#include <cassert>
#include "image_info.hpp"
#include "pixel_traits.hpp"
namespace png
{
/**
* \brief The default image_info holder class. Stores image_info
* member object.
*/
class def_image_info_holder
{
public:
def_image_info_holder(image_info const& info)
: m_info(info)
{
}
image_info& get_info()
{
return m_info;
}
private:
image_info m_info;
};
/**
* \brief An image_info holder class. Stores a reference to the
* image_info object. The image_info object itself should be
* stored elsewhere.
*/
class image_info_ref_holder
{
public:
image_info_ref_holder(image_info& info)
: m_info(info)
{
}
image_info& get_info()
{
return m_info;
}
private:
image_info& m_info;
};
/**
* \brief A base class template for consumer and generator
* classes. Provides default \c reset() method implementation as
* well as \c info_holder policy.
*/
template< typename pixel, class info_holder >
class streaming_base
{
public:
typedef pixel_traits< pixel > traits;
explicit streaming_base(image_info& info)
: m_info_holder(info)
{
}
streaming_base(uint_32 width, uint_32 height)
: m_info_holder(make_image_info< pixel >())
{
get_info().set_width(width);
get_info().set_height(height);
}
image_info const& get_info() const
{
return m_info_holder.get_info();
}
protected:
void reset(size_t /*pass*/)
{
// nothing to do in the most general case
}
image_info& get_info()
{
return m_info_holder.get_info();
}
info_holder m_info_holder;
};
} // namespace png
#endif // PNGPP_STREAMING_BASE_HPP_INCLUDED