81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
/*
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Copyright 2005-2007 Adobe Systems Incorporated
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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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See http://opensource.adobe.com/gil for most recent version including documentation.
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*/
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/*************************************************************************************************/
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#ifndef GIL_DYNAMIC_IO_H
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#define GIL_DYNAMIC_IO_H
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/// \file
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/// \brief Generic io functions for dealing with dynamic images
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//
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/// \author Hailin Jin and Lubomir Bourdev \n
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/// Adobe Systems Incorporated
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/// \date 2005-2007 \n Last updated May 30, 2006
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#include <boost/mpl/at.hpp>
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#include <boost/mpl/size.hpp>
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#include "../../gil_config.hpp"
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#include "io_error.hpp"
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#include "../dynamic_image/any_image.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.move_in(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>
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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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public:
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dynamic_io_fnobj(OpClass* op) : _op(op) {}
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typedef void result_type;
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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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};
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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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