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Diffstat (limited to 'boost/gil/extension/io/png/detail/write.hpp')
| -rw-r--r-- | boost/gil/extension/io/png/detail/write.hpp | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/boost/gil/extension/io/png/detail/write.hpp b/boost/gil/extension/io/png/detail/write.hpp new file mode 100644 index 0000000000..e571c09459 --- /dev/null +++ b/boost/gil/extension/io/png/detail/write.hpp @@ -0,0 +1,242 @@ +/* + Copyright 2007-2012 Christian Henning, Andreas Pokorny, Lubomir Bourdev + Use, modification and distribution are subject to 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_WRITE_HPP +#define BOOST_GIL_EXTENSION_IO_PNG_DETAIL_WRITE_HPP + +//////////////////////////////////////////////////////////////////////////////////////// +/// \file +/// \brief +/// \author Christian Henning, Andreas Pokorny, Lubomir Bourdev \n +/// +/// \date 2007-2012 \n +/// +//////////////////////////////////////////////////////////////////////////////////////// + +#include <boost/mpl/and.hpp> +#include <boost/mpl/equal_to.hpp> +#include <boost/mpl/less.hpp> +#include <boost/mpl/not.hpp> + +#include <boost/gil/io/device.hpp> +#include <boost/gil/io/row_buffer_helper.hpp> + +#include <boost/gil/extension/io/png/detail/writer_backend.hpp> + +namespace boost { namespace gil { + +#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400) +#pragma warning(push) +#pragma warning(disable:4512) //assignment operator could not be generated +#endif + +namespace detail { + +struct png_write_is_supported +{ + template< typename View > + struct apply + : public is_write_supported< typename get_pixel_type< View >::type + , png_tag + > + {}; +}; + +} // namespace detail + +/// +/// PNG Writer +/// +template< typename Device > +class writer< Device + , png_tag + > + : public writer_backend< Device + , png_tag + > +{ + +public: + + typedef writer_backend< Device , png_tag > backend_t; + + writer( const Device& io_dev + , const image_write_info< png_tag >& info + ) + : backend_t( io_dev + , info + ) + {} + + + template< typename View > + void apply( const View& view ) + { + io_error_if( view.width() == 0 && view.height() == 0 + , "png format cannot handle empty views." + ); + + this->write_header( view ); + + write_view( view + , typename is_bit_aligned< typename View::value_type >::type() + ); + } + +private: + + template<typename View> + void write_view( const View& view + , mpl::false_ // is bit aligned + ) + { + typedef typename get_pixel_type< View >::type pixel_t; + + typedef detail::png_write_support< typename channel_type < pixel_t >::type + , typename color_space_type< pixel_t >::type + > png_rw_info; + + if( little_endian() ) + { + set_swap< png_rw_info >(); + } + + std::vector< pixel< typename channel_type< View >::type + , layout<typename color_space_type< View >::type > + > + > row_buffer( view.width() ); + + for( int y = 0; y != view.height(); ++ y) + { + std::copy( view.row_begin( y ) + , view.row_end ( y ) + , row_buffer.begin() + ); + + png_write_row( this->get_struct() + , reinterpret_cast< png_bytep >( row_buffer.data() ) + ); + } + + png_write_end( this->get_struct() + , this->get_info() + ); + } + + template<typename View> + void write_view( const View& view + , mpl::true_ // is bit aligned + ) + { + typedef detail::png_write_support< typename kth_semantic_element_type< typename View::value_type + , 0 + >::type + , typename color_space_type<View>::type + > png_rw_info; + + if (little_endian() ) + { + set_swap< png_rw_info >(); + } + + detail::row_buffer_helper_view< View > row_buffer( view.width() + , false + ); + + for( int y = 0; y != view.height(); ++y ) + { + std::copy( view.row_begin( y ) + , view.row_end ( y ) + , row_buffer.begin() + ); + + png_write_row( this->get_struct() + , reinterpret_cast< png_bytep >( row_buffer.data() ) + ); + } + + png_free_data( this->get_struct() + , this->get_info() + , PNG_FREE_UNKN + , -1 + ); + + png_write_end( this->get_struct() + , this->get_info() + ); + } + + template< typename Info > struct is_less_than_eight : mpl::less< mpl::int_< Info::_bit_depth >, mpl::int_< 8 > > {}; + template< typename Info > struct is_equal_to_sixteen : mpl::equal_to< mpl::int_< Info::_bit_depth >, mpl::int_< 16 > > {}; + + template< typename Info > + void set_swap( typename enable_if< is_less_than_eight< Info > >::type* /* ptr */ = 0 ) + { + png_set_packswap( this->get_struct() ); + } + + template< typename Info > + void set_swap( typename enable_if< is_equal_to_sixteen< Info > >::type* /* ptr */ = 0 ) + { + png_set_swap( this->get_struct() ); + } + + template< typename Info > + void set_swap( typename enable_if< mpl::and_< mpl::not_< is_less_than_eight< Info > > + , mpl::not_< is_equal_to_sixteen< Info > > + > + >::type* /* ptr */ = 0 + ) + {} +}; + +/// +/// PNG Dynamic Image Writer +/// +template< typename Device > +class dynamic_image_writer< Device + , png_tag + > + : public writer< Device + , png_tag + > +{ + typedef writer< Device + , png_tag + > parent_t; + +public: + + dynamic_image_writer( const Device& io_dev + , const image_write_info< png_tag >& info +) + : parent_t( io_dev + , info + ) + {} + + template< typename Views > + void apply( const any_image_view< Views >& views ) + { + detail::dynamic_io_fnobj< detail::png_write_is_supported + , parent_t + > op( this ); + + apply_operation( views, op ); + } +}; + +#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400) +#pragma warning(pop) +#endif + +} // namespace gil +} // namespace boost + +#endif |