michael@0: /*  GRAPHITE2 LICENSING
michael@0: 
michael@0:     Copyright 2012, 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: 
michael@0: 
michael@0: #include "graphite2/Font.h"
michael@0: #include "inc/Main.h"
michael@0: 
michael@0: namespace graphite2 {
michael@0: 
michael@0: class Face;
michael@0: class FeatureVal;
michael@0: class GlyphFace;
michael@0: class Segment;
michael@0: 
michael@0: class GlyphCache
michael@0: {
michael@0:     class Loader;
michael@0: 
michael@0:     GlyphCache(const GlyphCache&);
michael@0:     GlyphCache& operator=(const GlyphCache&);
michael@0: 
michael@0: public:
michael@0:     GlyphCache(const Face & face, const uint32 face_options);
michael@0:     ~GlyphCache();
michael@0: 
michael@0:     unsigned short  numGlyphs() const throw();
michael@0:     unsigned short  numAttrs() const throw();
michael@0:     unsigned short  unitsPerEm() const throw();
michael@0: 
michael@0:     const GlyphFace *glyph(unsigned short glyphid) const;      //result may be changed by subsequent call with a different glyphid
michael@0:     const GlyphFace *glyphSafe(unsigned short glyphid) const;
michael@0: 
michael@0:     CLASS_NEW_DELETE;
michael@0:     
michael@0: private:
michael@0:     const Loader        * _glyph_loader;
michael@0:     const GlyphFace *   * _glyphs;
michael@0:     unsigned short        _num_glyphs,
michael@0:                           _num_attrs,
michael@0:                           _upem;
michael@0: };
michael@0: 
michael@0: inline
michael@0: unsigned short GlyphCache::numGlyphs() const throw()
michael@0: {
michael@0:     return _num_glyphs;
michael@0: }
michael@0: 
michael@0: inline
michael@0: unsigned short GlyphCache::numAttrs() const throw()
michael@0: {
michael@0:     return _num_attrs;
michael@0: }
michael@0: 
michael@0: inline
michael@0: unsigned short  GlyphCache::unitsPerEm() const throw()
michael@0: {
michael@0:     return _upem;
michael@0: }
michael@0: 
michael@0: inline
michael@0: const GlyphFace *GlyphCache::glyphSafe(unsigned short glyphid) const
michael@0: {
michael@0:     return glyphid < _num_glyphs ? glyph(glyphid) : NULL;
michael@0: }
michael@0: 
michael@0: } // namespace graphite2