michael@0: /*  GRAPHITE2 LICENSING
michael@0: 
michael@0:     Copyright 2010, SIL International
michael@0:     All rights reserved.
michael@0: 
michael@0:     This library is free software; you can redistribute it and/or modify
michael@0:     it under the terms of the GNU Lesser General Public License as published
michael@0:     by the Free Software Foundation; either version 2.1 of License, or
michael@0:     (at your option) any later version.
michael@0: 
michael@0:     This program is distributed in the hope that it will be useful,
michael@0:     but WITHOUT ANY WARRANTY; without even the implied warranty of
michael@0:     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
michael@0:     Lesser General Public License for more details.
michael@0: 
michael@0:     You should also have received a copy of the GNU Lesser General Public
michael@0:     License along with this library in the file named "LICENSE".
michael@0:     If not, write to the Free Software Foundation, 51 Franklin Street, 
michael@0:     Suite 500, Boston, MA 02110-1335, USA or visit their web page on the 
michael@0:     internet at http://www.fsf.org/licenses/lgpl.html.
michael@0: 
michael@0: Alternatively, the contents of this file may be used under the terms of the
michael@0: Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public
michael@0: License, as published by the Free Software Foundation, either version 2
michael@0: of the License or (at your option) any later version.
michael@0: */
michael@0: #pragma once
michael@0: #include <cassert>
michael@0: #include "graphite2/Font.h"
michael@0: #include "inc/Main.h"
michael@0: #include "inc/Face.h"
michael@0: 
michael@0: namespace graphite2 {
michael@0: 
michael@0: #define INVALID_ADVANCE -1e38f      // can't be a static const because non-integral
michael@0: 
michael@0: class Font
michael@0: {
michael@0: public:
michael@0:     Font(float ppm, const Face & face, const void * appFontHandle=0, const gr_font_ops * ops=0);
michael@0:     virtual ~Font();
michael@0: 
michael@0:     float advance(unsigned short glyphid) const;
michael@0:     float scale() const;
michael@0:     bool isHinted() const;
michael@0:     const Face & face() const;
michael@0: 
michael@0:     CLASS_NEW_DELETE;
michael@0: private:
michael@0:     gr_font_ops         m_ops;
michael@0:     const void  * const m_appFontHandle;
michael@0:     float             * m_advances;  // One advance per glyph in pixels. Nan if not defined
michael@0:     const Face        & m_face;
michael@0:     float               m_scale;      // scales from design units to ppm
michael@0:     bool                m_hinted;
michael@0: 
michael@0:     Font(const Font&);
michael@0:     Font& operator=(const Font&);
michael@0: };
michael@0: 
michael@0: inline
michael@0: float Font::advance(unsigned short glyphid) const
michael@0: {
michael@0:     if (m_advances[glyphid] == INVALID_ADVANCE)
michael@0:         m_advances[glyphid] = (*m_ops.glyph_advance_x)(m_appFontHandle, glyphid);
michael@0:     return m_advances[glyphid];
michael@0: }
michael@0: 
michael@0: inline
michael@0: float Font::scale() const
michael@0: {
michael@0:     return m_scale;
michael@0: }
michael@0: 
michael@0: inline
michael@0: bool Font::isHinted() const
michael@0: {
michael@0:     return m_hinted;
michael@0: }
michael@0: 
michael@0: inline
michael@0: const Face & Font::face() const
michael@0: {
michael@0:     return m_face;
michael@0: }
michael@0: 
michael@0: } // namespace graphite2
michael@0: 
michael@0: struct gr_font : public graphite2::Font {};