//
|
// Copyright 2005-2007 Adobe Systems Incorporated
|
//
|
// Distributed under 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
|
//
|
#ifndef BOOST_GIL_IO_DYNAMIC_IO_NEW_HPP
|
#define BOOST_GIL_IO_DYNAMIC_IO_NEW_HPP
|
|
#include <boost/gil/extension/dynamic_image/dynamic_image_all.hpp>
|
|
#include <boost/gil/detail/mp11.hpp>
|
#include <boost/gil/io/error.hpp>
|
|
#include <type_traits>
|
|
namespace boost { namespace gil {
|
|
namespace detail {
|
|
template <long N>
|
struct construct_matched_t
|
{
|
template <typename ...Images,typename Pred>
|
static bool apply(any_image<Images...>& img, Pred pred)
|
{
|
if (pred.template apply<mp11::mp_at_c<any_image<Images...>, N-1>>())
|
{
|
using image_t = mp11::mp_at_c<any_image<Images...>, N-1>;
|
image_t x;
|
img = std::move(x);
|
return true;
|
}
|
else
|
return construct_matched_t<N-1>::apply(img, 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 boolean integral coonstant,
|
// 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
|
{
|
private:
|
OpClass* _op;
|
|
template <typename View>
|
void apply(View const& view, std::true_type) { _op->apply(view); }
|
|
template <typename View, typename Info>
|
void apply(View const& view, Info const & info, const std::true_type) { _op->apply(view, info); }
|
|
template <typename View>
|
void apply(View const& /* view */, std::false_type)
|
{
|
io_error("dynamic_io: unsupported view type for the given file format");
|
}
|
|
template <typename View, typename Info >
|
void apply(View const& /* view */, Info const& /* info */, const std::false_type)
|
{
|
io_error("dynamic_io: unsupported view type for the given file format");
|
}
|
|
public:
|
dynamic_io_fnobj(OpClass* op) : _op(op) {}
|
|
using result_type = void;
|
|
template <typename View>
|
void operator()(View const& view)
|
{
|
apply(view, typename IsSupported::template apply<View>::type());
|
}
|
|
template< typename View, typename Info >
|
void operator()(View const& view, Info const& info)
|
{
|
apply(view, info, 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...>& img, Pred pred)
|
{
|
constexpr auto size = mp11::mp_size<any_image<Images...>>::value;
|
return detail::construct_matched_t<size>::apply(img, pred);
|
}
|
|
} } // namespace boost::gil
|
|
#endif
|
