1 /* GRAPHITE2 LICENSING
2
3 Copyright 2010, SIL International
4 All rights reserved.
5
6 This library is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as published
8 by the Free Software Foundation; either version 2.1 of License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should also have received a copy of the GNU Lesser General Public
17 License along with this library in the file named "LICENSE".
18 If not, write to the Free Software Foundation, 51 Franklin Street,
19 Suite 500, Boston, MA 02110-1335, USA or visit their web page on the
20 internet at http://www.fsf.org/licenses/lgpl.html.
21
22 Alternatively, the contents of this file may be used under the terms of the
23 Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public
24 License, as published by the Free Software Foundation, either version 2
25 of the License or (at your option) any later version.
26 */
27 #pragma once
28 #include <cassert>
29 #include "graphite2/Font.h"
30 #include "inc/Main.h"
31 #include "inc/Face.h"
32
33 namespace graphite2 {
34
35 #define INVALID_ADVANCE -1e38f // can't be a static const because non-integral
36
37 class Font
38 {
39 public:
40 Font(float ppm, const Face & face, const void * appFontHandle=0, const gr_font_ops * ops=0);
41 virtual ~Font();
42
43 float advance(unsigned short glyphid) const;
44 float scale() const;
45 bool isHinted() const;
46 const Face & face() const;
throw()47 operator bool () const throw() { return m_advances; }
48
49 CLASS_NEW_DELETE;
50 private:
51 gr_font_ops m_ops;
52 const void * const m_appFontHandle;
53 float * m_advances; // One advance per glyph in pixels. Nan if not defined
54 const Face & m_face;
55 float m_scale; // scales from design units to ppm
56 bool m_hinted;
57
58 Font(const Font&);
59 Font& operator=(const Font&);
60 };
61
62 inline
advance(unsigned short glyphid)63 float Font::advance(unsigned short glyphid) const
64 {
65 if (m_advances[glyphid] == INVALID_ADVANCE)
66 m_advances[glyphid] = (*m_ops.glyph_advance_x)(m_appFontHandle, glyphid);
67 return m_advances[glyphid];
68 }
69
70 inline
scale()71 float Font::scale() const
72 {
73 return m_scale;
74 }
75
76 inline
isHinted()77 bool Font::isHinted() const
78 {
79 return m_hinted;
80 }
81
82 inline
face()83 const Face & Font::face() const
84 {
85 return m_face;
86 }
87
88 } // namespace graphite2
89
90 struct gr_font : public graphite2::Font {};
91