WIP. Scale cover art option. Seems to work
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emeric
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/*
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Copyright 2008 Christian Henning
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Use, modification and distribution are subject to the Boost Software License,
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Version 1.0. (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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/*************************************************************************************************/
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#ifndef BOOST_GIL_EXTENSION_IO_PNM_IO_WRITE_HPP
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#define BOOST_GIL_EXTENSION_IO_PNM_IO_WRITE_HPP
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////////////////////////////////////////////////////////////////////////////////////////
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/// \file
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/// \brief
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/// \author Christian Henning \n
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///
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/// \date 2008 \n
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///
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////////////////////////////////////////////////////////////////////////////////////////
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#include <stdlib.h>
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#include <boost/lexical_cast.hpp>
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#include <boost/gil/extension/io_new/pnm_tags.hpp>
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#include <boost/gil/extension/io_new/detail/base.hpp>
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#include <boost/gil/extension/io_new/detail/io_device.hpp>
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namespace boost { namespace gil { namespace detail {
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template< typename Device >
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class writer< Device
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, pnm_tag
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>
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{
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typedef image_write_info< pnm_tag > info_t;
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public:
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writer( Device & file )
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: _out( file )
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{
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}
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~writer()
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{
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}
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template<typename View>
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void apply( const View& view )
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{
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info_t info;
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apply( view
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, info );
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}
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template<typename View>
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void apply( const View& view
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, const info_t& /* info */
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)
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{
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typedef typename get_pixel_type< View >::type pixel_t;
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std::size_t width = view.width();
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std::size_t height = view.height();
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std::size_t chn = num_channels< View >::value;
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std::size_t pitch = chn * width;
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unsigned int type;
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if( num_channels< View >::value == 1 )
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{
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if( is_bit_aligned< pixel_t >::value )
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{
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type = pnm_image_type::mono_bin_t::value;
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}
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else
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{
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type = pnm_image_type::gray_bin_t::value;
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}
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}
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else
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{
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type = pnm_image_type::color_bin_t::value;
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}
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// write header
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// Add a white space at each string so read_int() can decide when a numbers ends.
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std::string str( "P" );
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str += lexical_cast< std::string >( type ) + std::string( " " );
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_out.print_line( str );
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str.clear();
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str += lexical_cast< std::string >( width ) + std::string( " " );
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_out.print_line( str );
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str.clear();
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str += lexical_cast< std::string >( height ) + std::string( " " );
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_out.print_line( str );
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if( type != pnm_image_type::mono_bin_t::value )
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{
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_out.print_line( "255 ");
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}
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// write data
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write_data( view
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, pitch
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, typename is_bit_aligned< pixel_t >::type()
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);
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}
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template< typename View >
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void write_data( const View& src
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, std::size_t pitch
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, const mpl::true_& // bit_aligned
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)
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{
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BOOST_STATIC_ASSERT(( is_same< View
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, typename gray1_image_t::view_t
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>::value
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));
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byte_vector_t row( pitch / 8 );
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typedef typename View::x_iterator x_it_t;
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x_it_t row_it = x_it_t( &( *row.begin() ));
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negate_bits< byte_vector_t
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, mpl::true_
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> neg;
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mirror_bits< byte_vector_t
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, mpl::true_
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> mirror;
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for( typename View::y_coord_t y = 0; y < src.height(); ++y )
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{
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std::copy( src.row_begin( y )
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, src.row_end( y )
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, row_it
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);
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mirror( row );
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neg ( row );
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_out.write( &row.front()
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, pitch / 8
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);
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}
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}
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template< typename View >
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void write_data( const View& src
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, std::size_t pitch
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, const mpl::false_& // bit_aligned
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)
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{
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byte_vector_t buf( pitch );
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typedef typename View::value_type pixel_t;
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typedef typename view_type_from_pixel< pixel_t >::type view_t;
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view_t row = interleaved_view( src.width()
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, 1
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, reinterpret_cast< pixel_t* >( &buf.front() )
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, pitch
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);
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for( typename View::y_coord_t y = 0
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; y < src.height()
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; ++y
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)
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{
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copy_pixels( subimage_view( src
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, 0
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, (int) y
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, (int) src.width()
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, 1
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)
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, row
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);
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_out.write( &buf.front(), pitch );
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}
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}
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private:
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Device& _out;
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};
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struct pnm_write_is_supported
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{
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template< typename View >
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struct apply
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: public is_write_supported< typename get_pixel_type< View >::type
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, pnm_tag
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>
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{};
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};
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template< typename Device >
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class dynamic_image_writer< Device
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, pnm_tag
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>
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: public writer< Device
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, pnm_tag
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>
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{
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typedef writer< Device
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, pnm_tag
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> parent_t;
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public:
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dynamic_image_writer( Device& file )
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: parent_t( file )
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{}
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template< typename Views >
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void apply( const any_image_view< Views >& views )
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{
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dynamic_io_fnobj< pnm_write_is_supported
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, parent_t
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> op( this );
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apply_operation( views, op );
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}
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};
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} // detail
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} // gil
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} // boost
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#endif // BOOST_GIL_EXTENSION_IO_JPEG_IO_WRITE_HPP
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