/*

    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_DYNAMICIMAGE_ANY_IMAGE_HPP

#define GIL_DYNAMICIMAGE_ANY_IMAGE_HPP



////////////////////////////////////////////////////////////////////////////////////////

/// \file               

/// \brief Support for run-time instantiated images and image views

/// \author Lubomir Bourdev and Hailin Jin \n

///         Adobe Systems Incorporated

///

///

////////////////////////////////////////////////////////////////////////////////////////



#include "any_image_view.hpp"

#include "../../image.hpp"



//#ifdef _MSC_VER

//#pragma warning(push)

//#pragma warning(disable : 4244)     // conversion from 'std::ptrdiff_t' to 'int', possible loss of data. even if we static-assert the two types are the same (on visual studio 8)

//#endif



namespace boost { namespace gil {



namespace detail {

    template <typename T> struct get_view_t       { typedef typename T::view_t type; };

    template <typename Images> struct images_get_views_t : public mpl::transform<Images, get_view_t<mpl::_1> > {};



    template <typename T> struct get_const_view_t { typedef typename T::const_view_t type; };

    template <typename Images> struct images_get_const_views_t : public mpl::transform<Images, get_const_view_t<mpl::_1> > {};



    struct recreate_image_fnobj {

        typedef void result_type;

        const point2<std::ptrdiff_t>& _dimensions;

        unsigned _alignment;



        recreate_image_fnobj(const point2<std::ptrdiff_t>& dims, unsigned alignment) : _dimensions(dims), _alignment(alignment) {}

        template <typename Image> result_type operator()(Image& img) const { img.recreate(_dimensions,_alignment); }

    };



    template <typename AnyView>  // Models AnyViewConcept

    struct any_image_get_view {

        typedef AnyView result_type;

        template <typename Image> result_type operator()(      Image& img) const { return result_type(view(img)); }

    };



    template <typename AnyConstView>  // Models AnyConstViewConcept

    struct any_image_get_const_view {

        typedef AnyConstView result_type;

        template <typename Image> result_type operator()(const Image& img) const { return result_type(const_view(img)); }

    };

}



////////////////////////////////////////////////////////////////////////////////////////

/// \ingroup ImageModel

/// \brief Represents a run-time specified image. Note it does NOT model ImageConcept

///  

/// Represents an image whose type (color space, layout, planar/interleaved organization, etc) can be specified at run time.

/// It is the runtime equivalent of \p image.

/// Some of the requirements of ImageConcept, such as the \p value_type typedef cannot be fulfilled, since the language does not allow runtime type specification.

/// Other requirements, such as access to the pixels, would be inefficient to provide. Thus \p any_image does not fully model ImageConcept.

/// In particular, its \p view and \p const_view methods return \p any_image_view, which does not fully model ImageViewConcept. See \p any_image_view for more.

////////////////////////////////////////////////////////////////////////////////////////

template <typename ImageTypes>

class any_image : public variant<ImageTypes> {

    typedef variant<ImageTypes> parent_t;

public:

    typedef any_image_view<typename detail::images_get_const_views_t<ImageTypes>::type> const_view_t;

    typedef any_image_view<typename detail::images_get_views_t<ImageTypes>::type>       view_t;

    typedef std::ptrdiff_t x_coord_t;

    typedef std::ptrdiff_t y_coord_t;

    typedef point2<std::ptrdiff_t> point_t;



    any_image()                                                          : parent_t() {}

    template <typename T> explicit any_image(const T& obj)               : parent_t(obj) {}

    template <typename T> explicit any_image(T& obj, bool do_swap)       : parent_t(obj,do_swap) {}

    any_image(const any_image& v)                                        : parent_t((const parent_t&)v)    {}



    template <typename T> any_image& operator=(const T& obj)             { parent_t::operator=(obj); return *this; }

    any_image&                       operator=(const any_image& v)       { parent_t::operator=((const parent_t&)v); return *this;}



    void recreate(const point_t& dims, unsigned alignment=1)               { apply_operation(*this,detail::recreate_image_fnobj(dims,alignment)); }

    void recreate(x_coord_t width, y_coord_t height, unsigned alignment=1) { recreate(point2<std::ptrdiff_t>(width,height),alignment); }



    std::size_t num_channels()  const { return apply_operation(*this, detail::any_type_get_num_channels()); }

    point_t     dimensions()    const { return apply_operation(*this, detail::any_type_get_dimensions()); }

    x_coord_t   width()         const { return dimensions().x; }

    y_coord_t   height()        const { return dimensions().y; }

};



///@{

/// \name view, const_view

/// \brief Get an image view from a run-time instantiated image



/// \ingroup ImageModel



/// \brief Returns the non-constant-pixel view of any image. The returned view is any view.

template <typename Types>  GIL_FORCEINLINE // Models ImageVectorConcept

typename any_image<Types>::view_t view(any_image<Types>& anyImage) { 

    return apply_operation(anyImage, detail::any_image_get_view<typename any_image<Types>::view_t>());

}



/// \brief Returns the constant-pixel view of any image. The returned view is any view.

template <typename Types> GIL_FORCEINLINE // Models ImageVectorConcept

typename any_image<Types>::const_view_t const_view(const any_image<Types>& anyImage) { 

    return apply_operation(anyImage, detail::any_image_get_const_view<typename any_image<Types>::const_view_t>());

}

///@}



} }  // namespace boost::gil



//#ifdef _MSC_VER

//#pragma warning(pop)

//#endif



#endif

