/* | |
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 |