//
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// Copyright 2012 Christian Henning
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//
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// Distributed under the Boost Software License, Version 1.0
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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//
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#ifndef BOOST_GIL_EXTENSION_IO_PNG_DETAIL_BASE_HPP
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#define BOOST_GIL_EXTENSION_IO_PNG_DETAIL_BASE_HPP
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#include <boost/gil/extension/io/png/tags.hpp>
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#include <boost/assert.hpp>
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#include <memory>
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namespace boost { namespace gil { namespace detail {
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struct png_ptr_wrapper
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{
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png_ptr_wrapper()
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: _struct( nullptr )
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, _info ( nullptr )
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{}
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png_structp _struct;
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png_infop _info;
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};
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///
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/// Wrapper for libpng's png_struct and png_info object. Implements value semantics.
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///
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struct png_struct_info_wrapper
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{
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protected:
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using png_ptr_t = std::shared_ptr<png_ptr_wrapper>;
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protected:
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///
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/// Default Constructor
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///
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png_struct_info_wrapper( bool read = true )
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: _png_ptr( new png_ptr_wrapper()
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, ( ( read ) ? png_ptr_read_deleter : png_ptr_write_deleter )
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)
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{}
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png_ptr_wrapper* get() { return _png_ptr.get(); }
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png_ptr_wrapper const* get() const { return _png_ptr.get(); }
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png_struct* get_struct() { return get()->_struct; }
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png_struct const* get_struct() const { return get()->_struct; }
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png_info* get_info() { return get()->_info; }
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png_info const* get_info() const { return get()->_info; }
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private:
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static void png_ptr_read_deleter( png_ptr_wrapper* png_ptr )
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{
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if( png_ptr )
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{
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if( png_ptr->_struct && png_ptr->_info )
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{
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png_destroy_read_struct( &png_ptr->_struct
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, &png_ptr->_info
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, nullptr
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);
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}
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delete png_ptr;
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png_ptr = nullptr;
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}
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}
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static void png_ptr_write_deleter( png_ptr_wrapper* png_ptr )
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{
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if( png_ptr )
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{
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if( png_ptr->_struct && png_ptr->_info )
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{
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png_destroy_write_struct( &png_ptr->_struct
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, &png_ptr->_info
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);
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}
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delete png_ptr;
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png_ptr = nullptr;
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}
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}
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private:
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png_ptr_t _png_ptr;
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};
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} // namespace detail
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} // namespace gil
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} // namespace boost
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#endif
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