2 Copyright (C) 2014 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #ifndef LIBSUB_FONT_SIZE_H
21 #define LIBSUB_FONT_SIZE_H
23 #include <boost/optional.hpp>
28 * @brief A description of a font's size in one of a number of ways.
30 * An object of this class holds a font's size in one way, and it can convert
31 * to another on supply of the required conversion parameters.
36 void set_proportional (float p) {
40 void set_points (int p) {
44 boost::optional<float> proportional () const {
48 boost::optional<int> points () const {
52 bool specified () const;
54 float proportional (int screen_height_in_points) const;
55 int points (int screen_height_in_points) const;
57 static FontSize from_points (int p);
58 static FontSize from_proportional (float p);
61 /** as a proportion of screen height */
62 boost::optional<float> _proportional;
64 boost::optional<int> _points;
68 extern bool operator== (FontSize const & a, FontSize const & b);