Line data    Source code

       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             : 
      48           0 :     CLASS_NEW_DELETE;
      49             : private:
      50             :     gr_font_ops         m_ops;
      51             :     const void  * const m_appFontHandle;
      52             :     float             * m_advances;  // One advance per glyph in pixels. Nan if not defined
      53             :     const Face        & m_face;
      54             :     float               m_scale;      // scales from design units to ppm
      55             :     bool                m_hinted;
      56             : 
      57             :     Font(const Font&);
      58             :     Font& operator=(const Font&);
      59             : };
      60             : 
      61             : inline
      62           0 : float Font::advance(unsigned short glyphid) const
      63             : {
      64           0 :     if (m_advances[glyphid] == INVALID_ADVANCE)
      65           0 :         m_advances[glyphid] = (*m_ops.glyph_advance_x)(m_appFontHandle, glyphid);
      66           0 :     return m_advances[glyphid];
      67             : }
      68             : 
      69             : inline
      70           0 : float Font::scale() const
      71             : {
      72           0 :     return m_scale;
      73             : }
      74             : 
      75             : inline
      76           0 : bool Font::isHinted() const
      77             : {
      78           0 :     return m_hinted;
      79             : }
      80             : 
      81             : inline
      82           0 : const Face & Font::face() const
      83             : {
      84           0 :     return m_face;
      85             : }
      86             : 
      87             : } // namespace graphite2
      88             : 
      89             : struct gr_font : public graphite2::Font {};