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