Font.h (2644B)
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; 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 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 71 float Font::scale() const 72 { 73 return m_scale; 74 } 75 76 inline 77 bool Font::isHinted() const 78 { 79 return m_hinted; 80 } 81 82 inline 83 const Face & Font::face() const 84 { 85 return m_face; 86 } 87 88 } // namespace graphite2 89 90 struct gr_font : public graphite2::Font {};