| /* |
| 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 |