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