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/*
Copyright 2005-2007 Adobe Systems Incorporated
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).
See http://opensource.adobe.com/gil for most recent version including documentation.
*/
/*************************************************************************************************/
#ifndef GIL_DYNAMIC_IO_H
#define GIL_DYNAMIC_IO_H
/// \file
/// \brief Generic io functions for dealing with dynamic images
//
/// \author Hailin Jin and Lubomir Bourdev \n
/// Adobe Systems Incorporated
/// \date 2005-2007 \n Last updated May 30, 2006
#include <boost/mpl/at.hpp>
#include <boost/mpl/size.hpp>
#include "../../gil_config.hpp"
#include "io_error.hpp"
#include "../dynamic_image/any_image.hpp"
namespace boost { namespace gil {
namespace detail {
template <long N>
struct construct_matched_t {
template <typename Images,typename Pred>
static bool apply(any_image<Images>& im,Pred pred) {
if (pred.template apply<typename mpl::at_c<Images,N-1>::type>()) {
typename mpl::at_c<Images,N-1>::type x;
im.move_in(x);
return true;
} else return construct_matched_t<N-1>::apply(im,pred);
}
};
template <>
struct construct_matched_t<0> {
template <typename Images,typename Pred>
static bool apply(any_image<Images>&,Pred) {return false;}
};
// A function object that can be passed to apply_operation.
// Given a predicate IsSupported taking a view type and returning an MPL boolean,
// calls the apply method of OpClass with the view if the given view IsSupported, or throws an exception otherwise
template <typename IsSupported, typename OpClass>
class dynamic_io_fnobj {
OpClass* _op;
template <typename View>
void apply(const View& view,mpl::true_ ) {_op->apply(view);}
template <typename View>
void apply(const View& view,mpl::false_) {io_error("dynamic_io: unsupported view type for the given file format");}
public:
dynamic_io_fnobj(OpClass* op) : _op(op) {}
typedef void result_type;
template <typename View>
void operator()(const View& view) {apply(view,typename IsSupported::template apply<View>::type());}
};
} // namespace detail
/// \brief Within the any_image, constructs an image with the given dimensions
/// and a type that satisfies the given predicate
template <typename Images,typename Pred>
inline bool construct_matched(any_image<Images>& im,Pred pred) {
return detail::construct_matched_t<mpl::size<Images>::value>::apply(im,pred);
}
} } // namespace boost::gil
#endif
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