shrink.hpp

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// Copyright Tom Brinkman 2008. 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 _shrink_hpp_
#define _shrink_hpp_

#include <boost/gil/gil_all.hpp>
#include <boost/function.hpp>

namespace layer
{

template <typename view_t>
struct shrink
{
        typedef boost::function<void (view_t&)> funct_t;

        double left;
        double top;
        double right;
        double bottom;
        funct_t funct;

        shrink(funct_t funct, double left=5, double top=5,
                double right=5, double bottom=5) :
                        funct(funct), left(left), top(top), 
                                right(right), bottom(bottom){}

        void operator()(view_t& view)
        {
                if (left < 1.0) left *= view.width();
                if (right < 1.0) right *= view.width();
                if (top < 1.0) top *= view.height();
                if (bottom < 1.0) bottom *= view.height();

                double width = view.width()-left-right;
                double height = view.height()-top-bottom;
                view_t view2 = boost::gil::subimage_view(view,(int)left,(int)top,(int)width,(int)height);
                funct(view2);
        }
};      

}

#endif