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: 
michael@0: #include "inc/GlyphFace.h"
michael@0: #include "graphite2/Font.h"
michael@0: 
michael@0: namespace graphite2 {
michael@0: 
michael@0: class Segment;
michael@0: class Face;
michael@0: class FeatureVal;
michael@0: 
michael@0: 
michael@0: class GlyphFaceCacheHeader
michael@0: {
michael@0: public:
michael@0:     bool initialize(const Face & face, const bool dumb_font);    //return result indicates success. Do not use if failed.
michael@0:     unsigned short numGlyphs() const { return m_nGlyphs; }
michael@0:     unsigned short numAttrs() const { return m_numAttrs; }
michael@0: 
michael@0: private:
michael@0: friend class Face;
michael@0: friend class GlyphFace;
michael@0:     const byte* m_pHead,
michael@0:     		  * m_pHHea,
michael@0:     		  * m_pHmtx,
michael@0:     		  * m_pGlat,
michael@0:     		  * m_pGloc,
michael@0:     		  * m_pGlyf,
michael@0:     		  * m_pLoca;
michael@0:     size_t		m_lHmtx,
michael@0:     			m_lGlat,
michael@0:     			m_lGlyf,
michael@0:     			m_lLoca;
michael@0: 
michael@0:     uint32			m_fGlat;
michael@0:     unsigned short 	m_numAttrs,					// number of glyph attributes per glyph
michael@0:     				m_nGlyphsWithGraphics,		//i.e. boundary box and advance
michael@0:     				m_nGlyphsWithAttributes,
michael@0:     				m_nGlyphs;					// number of glyphs in the font. Max of the above 2.
michael@0:     bool 			m_locFlagsUse32Bit;
michael@0: };
michael@0: 
michael@0: class GlyphFaceCache : public GlyphFaceCacheHeader
michael@0: {
michael@0: public:
michael@0:     static GlyphFaceCache* makeCache(const GlyphFaceCacheHeader& hdr /*, EGlyphCacheStrategy requested */);
michael@0: 
michael@0:     GlyphFaceCache(const GlyphFaceCacheHeader& hdr);
michael@0:     ~GlyphFaceCache();
michael@0: 
michael@0:     const GlyphFace *glyphSafe(unsigned short glyphid) const { return glyphid<numGlyphs()?glyph(glyphid):NULL; }
michael@0:     uint16 glyphAttr(uint16 gid, uint8 gattr) const { if (gattr>=numAttrs()) return 0; const GlyphFace*p=glyphSafe(gid); return p?p->getAttr(gattr):0; }
michael@0: 
michael@0:     void * operator new (size_t s, const GlyphFaceCacheHeader& hdr)
michael@0:     {
michael@0:         return malloc(s + sizeof(GlyphFace*)*hdr.numGlyphs());
michael@0:     }
michael@0:     // delete in case an exception is thrown in constructor
michael@0:     void operator delete(void* p, const GlyphFaceCacheHeader& ) throw()
michael@0:     {
michael@0:         free(p);
michael@0:     }
michael@0: 
michael@0:     const GlyphFace *glyph(unsigned short glyphid) const;      //result may be changed by subsequent call with a different glyphid
michael@0:     void loadAllGlyphs();
michael@0: 
michael@0:     CLASS_NEW_DELETE
michael@0:     
michael@0: private:
michael@0:     GlyphFace **glyphPtrDirect(unsigned short glyphid) const { return (GlyphFace **)((const char*)(this)+sizeof(GlyphFaceCache)+sizeof(GlyphFace*)*glyphid);}
michael@0: 
michael@0: private:      //defensive
michael@0:     GlyphFaceCache(const GlyphFaceCache&);
michael@0:     GlyphFaceCache& operator=(const GlyphFaceCache&);
michael@0: };
michael@0: 
michael@0: } // namespace graphite2