pattern.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 _pattern_hpp_
#define _pattern_hpp_

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

namespace layer
{

template <typename view_t>
struct pattern
{
        view_t v2;
        pattern(view_t v2) : v2(v2){}
                
        void operator()(view_t& view)
        {
                using namespace boost::gil;

                int h = v2.height();
                int w = v2.width();
                if (h > view.height() || w > view.width())
                        return;
                
                int n = 0;
                for (int x = 0; x < view.width(); x+=w)
                {
                        for (int y = 0; y < view.height(); y+=h)
                        {
                                int aw = w;
                                if (x+w > view.width())
                                {
                                        int t = x+w-view.width();
                                        aw = w-t;       
                                }

                                int ah = h;
                                if (y+h > view.height())
                                {
                                        int t = y+h-view.height();
                                        ah = h-t;       
                                }

                                view_t v3 = subimage_view(view,x,y,aw,ah);
                                view_t v4 = subimage_view(v2,0,0,aw,ah);
                                boost::gil::copy_pixels(v4,v3);
                        }
                }
        }
};

}

#endif