119 lines
2.7 KiB
C++
119 lines
2.7 KiB
C++
//
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// Copyright 2007-2008 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_IO_SCANLINE_READ_ITERATOR_HPP
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#define BOOST_GIL_IO_SCANLINE_READ_ITERATOR_HPP
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#include <boost/gil/io/error.hpp>
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#include <boost/gil/io/typedefs.hpp>
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#include <boost/iterator/iterator_facade.hpp>
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#include <iterator>
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#include <memory>
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#include <vector>
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namespace boost { namespace gil {
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#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
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#pragma warning(push)
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#pragma warning(disable:4512) //assignment operator could not be generated
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#endif
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/// Input iterator to read images.
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template< typename Reader >
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class scanline_read_iterator : public boost::iterator_facade< scanline_read_iterator< Reader >
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, byte_t*
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, std::input_iterator_tag
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>
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{
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private:
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using base_t = boost::iterator_facade
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<
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scanline_read_iterator<Reader>,
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byte_t*,
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std::input_iterator_tag
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>;
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public:
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scanline_read_iterator( Reader& reader
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, int pos = 0
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)
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: _pos( pos )
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, _read_scanline( true )
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, _skip_scanline( true )
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, _reader( reader )
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{
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_buffer = std::make_shared< buffer_t >( buffer_t( _reader._scanline_length ));
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_buffer_start = &_buffer->front();
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}
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private:
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friend class boost::iterator_core_access;
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void increment()
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{
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if( _skip_scanline == true )
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{
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_reader.skip( _buffer_start
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, _pos
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);
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}
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++_pos;
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_skip_scanline = true;
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_read_scanline = true;
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}
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bool equal( const scanline_read_iterator& rhs ) const
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{
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return _pos == rhs._pos;
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}
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typename base_t::reference dereference() const
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{
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if( _read_scanline == true )
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{
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_reader.read( _buffer_start
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, _pos
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);
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}
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_skip_scanline = false;
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_read_scanline = false;
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return _buffer_start;
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}
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private:
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Reader& _reader;
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mutable int _pos;
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mutable bool _read_scanline;
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mutable bool _skip_scanline;
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using buffer_t = std::vector<byte_t>;
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using buffer_ptr_t = std::shared_ptr<buffer_t>;
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buffer_ptr_t _buffer;
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mutable byte_t* _buffer_start;
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};
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#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
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#pragma warning(pop)
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#endif
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} // namespace gil
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} // namespace boost
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#endif
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