// // Copyright 2007-2008 Christian Henning, Andreas Pokorny // // 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_IO_CONVERSION_POLICIES_HPP #define BOOST_GIL_IO_CONVERSION_POLICIES_HPP #include <boost/gil/image_view_factory.hpp> #include <boost/gil/detail/mp11.hpp> #include <boost/gil/io/error.hpp> #include <algorithm> #include <iterator> #include <type_traits> namespace boost{ namespace gil { namespace detail { struct read_and_no_convert { public: using color_converter_type = void *; template <typename InIterator, typename OutIterator> void read( InIterator const& /*begin*/, InIterator const& /*end*/ , OutIterator /*out*/, typename std::enable_if < mp11::mp_not < pixels_are_compatible < typename std::iterator_traits<InIterator>::value_type, typename std::iterator_traits<OutIterator>::value_type > >::value >::type* /*dummy*/ = nullptr) { io_error("Data cannot be copied because the pixels are incompatible."); } template <typename InIterator, typename OutIterator> void read(InIterator const& begin, InIterator const& end, OutIterator out, typename std::enable_if < pixels_are_compatible < typename std::iterator_traits<InIterator>::value_type, typename std::iterator_traits<OutIterator>::value_type >::value >::type* /*dummy*/ = nullptr) { std::copy(begin, end, out); } }; template<typename CC> struct read_and_convert { public: using color_converter_type = default_color_converter; CC _cc; read_and_convert() {} read_and_convert( const color_converter_type& cc ) : _cc( cc ) {} template< typename InIterator , typename OutIterator > void read( const InIterator& begin , const InIterator& end , OutIterator out ) { using deref_t = color_convert_deref_fn<typename std::iterator_traits<InIterator>::reference , typename std::iterator_traits<OutIterator>::value_type //reference? , CC >; std::transform( begin , end , out , deref_t( _cc ) ); } }; /// is_read_only metafunction /// \brief Determines if reader type is read only ( no conversion ). template< typename Conversion_Policy > struct is_read_only : std::false_type {}; template<> struct is_read_only<detail::read_and_no_convert> : std::true_type {}; } // namespace detail } // namespace gil } // namespace boost #endif