101 lines
2.9 KiB
C++
101 lines
2.9 KiB
C++
//
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// Copyright 2005-2007 Adobe Systems Incorporated
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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_DYNAMIC_IO_NEW_HPP
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#define BOOST_GIL_IO_DYNAMIC_IO_NEW_HPP
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#include <boost/gil/extension/dynamic_image/dynamic_image_all.hpp>
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#include <boost/gil/io/error.hpp>
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#include <boost/mpl/at.hpp>
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#include <boost/mpl/size.hpp>
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namespace boost { namespace gil {
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namespace detail {
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template <long N>
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struct construct_matched_t {
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template <typename Images,typename Pred>
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static bool apply(any_image<Images>& im,Pred pred) {
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if (pred.template apply<typename mpl::at_c<Images,N-1>::type>()) {
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typename mpl::at_c<Images,N-1>::type x;
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im = std::move(x);
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return true;
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} else return construct_matched_t<N-1>::apply(im,pred);
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}
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};
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template <>
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struct construct_matched_t<0> {
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template <typename Images,typename Pred>
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static bool apply(any_image<Images>&,Pred) {return false;}
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};
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// A function object that can be passed to apply_operation.
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// Given a predicate IsSupported taking a view type and returning an MPL boolean,
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// calls the apply method of OpClass with the view if the given view IsSupported, or throws an exception otherwise
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template <typename IsSupported, typename OpClass>
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class dynamic_io_fnobj {
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OpClass* _op;
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template <typename View>
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void apply(const View& view,mpl::true_ ) {_op->apply(view);}
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template <typename View, typename Info >
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void apply( const View& view
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, const Info& info
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, const mpl::true_
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)
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{
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_op->apply( view, info );
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}
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template <typename View>
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void apply(const View& /* view */ ,mpl::false_) {io_error("dynamic_io: unsupported view type for the given file format");}
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template <typename View, typename Info >
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void apply( const View& /* view */
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, const Info& /* info */
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, const mpl::false_
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)
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{
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io_error( "dynamic_io: unsupported view type for the given file format" );
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}
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public:
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dynamic_io_fnobj(OpClass* op) : _op(op) {}
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using result_type = void;
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template <typename View>
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void operator()(const View& view) {apply(view,typename IsSupported::template apply<View>::type());}
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template< typename View, typename Info >
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void operator()(const View& view, const Info& info )
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{
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apply( view
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, info
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, typename IsSupported::template apply< View >::type()
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);
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}
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};
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} // namespace detail
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/// \brief Within the any_image, constructs an image with the given dimensions
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/// and a type that satisfies the given predicate
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template <typename Images,typename Pred>
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inline bool construct_matched(any_image<Images>& im,Pred pred) {
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return detail::construct_matched_t<mpl::size<Images>::value>::apply(im,pred);
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}
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} } // namespace boost::gil
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#endif
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