Chris@16: /*
Chris@16:     Copyright 2005-2007 Adobe Systems Incorporated
Chris@16:    
Chris@16:     Use, modification and distribution are subject to the Boost Software License,
Chris@16:     Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16:     http://www.boost.org/LICENSE_1_0.txt).
Chris@16: 
Chris@16:     See http://opensource.adobe.com/gil for most recent version including documentation.
Chris@16: */
Chris@16: /*************************************************************************************************/
Chris@16: 
Chris@16: #ifndef GIL_DYNAMIC_IO_H
Chris@16: #define GIL_DYNAMIC_IO_H
Chris@16: 
Chris@16: /// \file
Chris@16: /// \brief  Generic io functions for dealing with dynamic images
Chris@16: //
Chris@16: /// \author Hailin Jin and Lubomir Bourdev \n
Chris@16: ///         Adobe Systems Incorporated
Chris@16: /// \date   2005-2007 \n Last updated May 30, 2006
Chris@16: 
Chris@16: #include <boost/mpl/at.hpp>
Chris@16: #include <boost/mpl/size.hpp>
Chris@16: #include "../../gil_config.hpp"
Chris@16: #include "io_error.hpp"
Chris@16: #include "../dynamic_image/any_image.hpp"
Chris@16: 
Chris@16: namespace boost { namespace gil {
Chris@16: 
Chris@16: namespace detail {
Chris@16: 
Chris@16: template <long N>
Chris@16: struct construct_matched_t {
Chris@16:     template <typename Images,typename Pred>
Chris@16:     static bool apply(any_image<Images>& im,Pred pred) {
Chris@16:         if (pred.template apply<typename mpl::at_c<Images,N-1>::type>()) {
Chris@16:             typename mpl::at_c<Images,N-1>::type x;
Chris@16:             im.move_in(x);
Chris@16:             return true;
Chris@16:         } else return construct_matched_t<N-1>::apply(im,pred);
Chris@16:     }
Chris@16: };
Chris@16: template <>
Chris@16: struct construct_matched_t<0> {
Chris@16:     template <typename Images,typename Pred>
Chris@16:     static bool apply(any_image<Images>&,Pred) {return false;}
Chris@16: };
Chris@16: 
Chris@16: // A function object that can be passed to apply_operation.
Chris@16: // Given a predicate IsSupported taking a view type and returning an MPL boolean,
Chris@16: // calls the apply method of OpClass with the view if the given view IsSupported, or throws an exception otherwise
Chris@16: template <typename IsSupported, typename OpClass>
Chris@16: class dynamic_io_fnobj {
Chris@16:     OpClass* _op;
Chris@16: 
Chris@16:     template <typename View>
Chris@16:     void apply(const View& view,mpl::true_ ) {_op->apply(view);}
Chris@16:     template <typename View>
Chris@16:     void apply(const View& view,mpl::false_) {io_error("dynamic_io: unsupported view type for the given file format");}
Chris@16: public:
Chris@16:     dynamic_io_fnobj(OpClass* op) : _op(op) {}
Chris@16: 
Chris@16:     typedef void result_type;
Chris@16: 
Chris@16:     template <typename View>
Chris@16:     void operator()(const View& view) {apply(view,typename IsSupported::template apply<View>::type());}
Chris@16: };
Chris@16: 
Chris@16: } // namespace detail
Chris@16: 
Chris@16: /// \brief Within the any_image, constructs an image with the given dimensions
Chris@16: ///        and a type that satisfies the given predicate
Chris@16: template <typename Images,typename Pred>
Chris@16: inline bool construct_matched(any_image<Images>& im,Pred pred) {
Chris@16:     return detail::construct_matched_t<mpl::size<Images>::value>::apply(im,pred);
Chris@16: }
Chris@16: 
Chris@16: } }  // namespace boost::gil
Chris@16: 
Chris@16: #endif