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
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*/
#ifndef PNGPP_STREAMING_BASE_HPP_INCLUDED
#define PNGPP_STREAMING_BASE_HPP_INCLUDED
#include <cassert>
#include "image_info.hpp"
#include "pixel_traits.hpp"
namespace png
{
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;
};
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;
};
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
png::def_image_info_holder
The default image_info holder class. Stores image_info member object.
Definition: streaming_base.hpp:45
png::streaming_base::m_info_holder
info_holder m_info_holder
Definition: streaming_base.hpp:123
png::streaming_base::streaming_base
streaming_base(uint_32 width, uint_32 height)
Definition: streaming_base.hpp:100
pixel_traits.hpp
image_info.hpp
png::streaming_base::get_info
image_info & get_info()
Definition: streaming_base.hpp:118
png::pixel_traits
Pixel traits class template.
Definition: pixel_traits.hpp:48
png::streaming_base::traits
pixel_traits< pixel > traits
Definition: streaming_base.hpp:93
png::image_info
Holds information about PNG image.
Definition: image_info.hpp:47
png::image_info::set_width
void set_width(uint_32 width)
Definition: image_info.hpp:72
png::image_info_ref_holder
An image_info holder class. Stores a reference to the image_info object. The image_info object itself...
Definition: streaming_base.hpp:67
png::streaming_base::streaming_base
streaming_base(image_info &info)
Definition: streaming_base.hpp:95
png::uint_32
png_uint_32 uint_32
Definition: types.hpp:41
png::streaming_base
A base class template for consumer and generator classes. Provides default reset() method implementat...
Definition: streaming_base.hpp:90
png::def_image_info_holder::def_image_info_holder
def_image_info_holder(image_info const &info)
Definition: streaming_base.hpp:48
png::def_image_info_holder::get_info
image_info & get_info()
Definition: streaming_base.hpp:53
png::image_info::set_height
void set_height(uint_32 height)
Definition: image_info.hpp:82
png::streaming_base::get_info
image_info const & get_info() const
Definition: streaming_base.hpp:107
png::streaming_base::reset
void reset(size_t)
Definition: streaming_base.hpp:113
png::info
Holds information about PNG image. Adapter class for IO image operations.
Definition: info.hpp:45
png::image_info_ref_holder::image_info_ref_holder
image_info_ref_holder(image_info &info)
Definition: streaming_base.hpp:70
png::make_image_info
image_info make_image_info()
Returns an image_info object with color_type and bit_depth fields setup appropriate for the pixel typ...
Definition: image_info.hpp:204
png::image_info_ref_holder::get_info
image_info & get_info()
Definition: streaming_base.hpp:75
png
Definition: color.hpp:36