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comparison: gfx/graphite2/src/inc/GlyphFaceCache.h
gfx/graphite2/src/inc/GlyphFaceCache.h
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| 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 | |
| 29 #include "inc/GlyphFace.h" | |
| 30 #include "graphite2/Font.h" | |
| 31 | |
| 32 namespace graphite2 { | |
| 33 | |
| 34 class Segment; | |
| 35 class Face; | |
| 36 class FeatureVal; | |
| 37 | |
| 38 | |
| 39 class GlyphFaceCacheHeader | |
| 40 { | |
| 41 public: | |
| 42 bool initialize(const Face & face, const bool dumb_font); //return result indicates success. Do not use if failed. | |
| 43 unsigned short numGlyphs() const { return m_nGlyphs; } | |
| 44 unsigned short numAttrs() const { return m_numAttrs; } | |
| 45 | |
| 46 private: | |
| 47 friend class Face; | |
| 48 friend class GlyphFace; | |
| 49 const byte* m_pHead, | |
| 50 * m_pHHea, | |
| 51 * m_pHmtx, | |
| 52 * m_pGlat, | |
| 53 * m_pGloc, | |
| 54 * m_pGlyf, | |
| 55 * m_pLoca; | |
| 56 size_t m_lHmtx, | |
| 57 m_lGlat, | |
| 58 m_lGlyf, | |
| 59 m_lLoca; | |
| 60 | |
| 61 uint32 m_fGlat; | |
| 62 unsigned short m_numAttrs, // number of glyph attributes per glyph | |
| 63 m_nGlyphsWithGraphics, //i.e. boundary box and advance | |
| 64 m_nGlyphsWithAttributes, | |
| 65 m_nGlyphs; // number of glyphs in the font. Max of the above 2. | |
| 66 bool m_locFlagsUse32Bit; | |
| 67 }; | |
| 68 | |
| 69 class GlyphFaceCache : public GlyphFaceCacheHeader | |
| 70 { | |
| 71 public: | |
| 72 static GlyphFaceCache* makeCache(const GlyphFaceCacheHeader& hdr /*, EGlyphCacheStrategy requested */); | |
| 73 | |
| 74 GlyphFaceCache(const GlyphFaceCacheHeader& hdr); | |
| 75 ~GlyphFaceCache(); | |
| 76 | |
| 77 const GlyphFace *glyphSafe(unsigned short glyphid) const { return glyphid<numGlyphs()?glyph(glyphid):NULL; } | |
| 78 uint16 glyphAttr(uint16 gid, uint8 gattr) const { if (gattr>=numAttrs()) return 0; const GlyphFace*p=glyphSafe(gid); return p?p->getAttr(gattr):0; } | |
| 79 | |
| 80 void * operator new (size_t s, const GlyphFaceCacheHeader& hdr) | |
| 81 { | |
| 82 return malloc(s + sizeof(GlyphFace*)*hdr.numGlyphs()); | |
| 83 } | |
| 84 // delete in case an exception is thrown in constructor | |
| 85 void operator delete(void* p, const GlyphFaceCacheHeader& ) throw() | |
| 86 { | |
| 87 free(p); | |
| 88 } | |
| 89 | |
| 90 const GlyphFace *glyph(unsigned short glyphid) const; //result may be changed by subsequent call with a different glyphid | |
| 91 void loadAllGlyphs(); | |
| 92 | |
| 93 CLASS_NEW_DELETE | |
| 94 | |
| 95 private: | |
| 96 GlyphFace **glyphPtrDirect(unsigned short glyphid) const { return (GlyphFace **)((const char*)(this)+sizeof(GlyphFaceCache)+sizeof(GlyphFace*)*glyphid);} | |
| 97 | |
| 98 private: //defensive | |
| 99 GlyphFaceCache(const GlyphFaceCache&); | |
| 100 GlyphFaceCache& operator=(const GlyphFaceCache&); | |
| 101 }; | |
| 102 | |
| 103 } // namespace graphite2 |
