font_size.h

/*
    Copyright (C) 2014 Carl Hetherington <cth@carlh.net>
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
*/
 
#ifndef LIBSUB_FONT_SIZE_H
#define LIBSUB_FONT_SIZE_H
 
#include <boost/optional.hpp>
 
namespace sub {
 
class FontSize
{
public:
    void set_proportional (float p) {
        _proportional = p;
    }
 
    void set_points (int p) {
        _points = p;
    }
 
    boost::optional<float> proportional () const {
        return _proportional;
    }
 
    boost::optional<int> points () const {
        return _points;
    }
 
    bool specified () const;
 
    float proportional (int screen_height_in_points) const;
    int points (int screen_height_in_points) const;
 
    static FontSize from_points (int p);
    static FontSize from_proportional (float p);
 
private:
    boost::optional<float> _proportional;
    boost::optional<int> _points;
 
};
 
extern bool operator== (FontSize const & a, FontSize const & b);
 
}
 
#endif