aligned.hpp

Go to the documentation of this file.

// 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 _aligned_hpp_
#define _aligned_hpp_

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

namespace layer
{

template <typename view_t>
struct aligned
{
        enum 
        { 
                left = (0x1 << 0),
                center = (0x1 << 1),
                right = (0x1 << 2),
                top = (0x1 << 3),
                middle = (0x1 << 5),
                bottom = (0x1 << 7),
        }; 

        view_t& v2;
        int align;
        aligned(view_t v2, int align = center|middle) : v2(v2), align(align) {}
                
        void operator()(view_t& view)
        {
                using namespace boost::gil;

                int w = v2.width();
                int h = v2.height();

                if (h > view.height() || w > view.width())
                        return;
                
                int x = 0;
                if (align & center)
                        x = (view.width()-w)/2;
                else if (align & right)
                        x = view.width()-w;

                int y = 0;
                if (align & middle)
                        y = (view.height()-h)/2;
                else if (align & bottom)
                        y = view.height()-h;
                
                view_t v3 = subimage_view(view,x,y,w,h);
                boost::gil::copy_pixels(v2,v3);
        }
};

}

#endif