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+/* GRAPHITE2 LICENSING
+
+ Copyright 2010, SIL International
+ All rights reserved.
+
+ This library is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published
+ by the Free Software Foundation; either version 2.1 of License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should also have received a copy of the GNU Lesser General Public
+ License along with this library in the file named "LICENSE".
+ If not, write to the Free Software Foundation, 51 Franklin Street,
+ Suite 500, Boston, MA 02110-1335, USA or visit their web page on the
+ internet at http://www.fsf.org/licenses/lgpl.html.
+
+Alternatively, the contents of this file may be used under the terms of the
+Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public
+License, as published by the Free Software Foundation, either version 2
+of the License or (at your option) any later version.
+*/
+#pragma once
+/*--------------------------------------------------------------------*//*:Ignore this sentence.
+
+File: TtfUtil.h
+Responsibility: Alan Ward
+Last reviewed: Not yet.
+
+Description:
+ Utility class for handling TrueType font files.
+----------------------------------------------------------------------------------------------*/
+
+
+#include <cstddef>
+
+namespace graphite2
+{
+namespace TtfUtil
+{
+
+typedef long fontTableId32;
+typedef unsigned short gid16;
+
+#define TTF_TAG(a,b,c,d) ((a << 24UL) + (b << 16UL) + (c << 8UL) + (d))
+
+// Enumeration used to specify a table in a TTF file
+class Tag
+{
+ unsigned long _v;
+public:
+ Tag(const char n[5]) throw() : _v(TTF_TAG(n[0],n[1],n[2],n[3])) {}
+ Tag(const unsigned long tag) throw() : _v(tag) {}
+
+ operator unsigned long () const throw () { return _v; }
+
+ enum
+ {
+ Feat = TTF_TAG('F','e','a','t'),
+ Glat = TTF_TAG('G','l','a','t'),
+ Gloc = TTF_TAG('G','l','o','c'),
+ Sile = TTF_TAG('S','i','l','e'),
+ Silf = TTF_TAG('S','i','l','f'),
+ Sill = TTF_TAG('S','i','l','l'),
+ cmap = TTF_TAG('c','m','a','p'),
+ cvt = TTF_TAG('c','v','t',' '),
+ cryp = TTF_TAG('c','r','y','p'),
+ head = TTF_TAG('h','e','a','d'),
+ fpgm = TTF_TAG('f','p','g','m'),
+ gdir = TTF_TAG('g','d','i','r'),
+ glyf = TTF_TAG('g','l','y','f'),
+ hdmx = TTF_TAG('h','d','m','x'),
+ hhea = TTF_TAG('h','h','e','a'),
+ hmtx = TTF_TAG('h','m','t','x'),
+ loca = TTF_TAG('l','o','c','a'),
+ kern = TTF_TAG('k','e','r','n'),
+ LTSH = TTF_TAG('L','T','S','H'),
+ maxp = TTF_TAG('m','a','x','p'),
+ name = TTF_TAG('n','a','m','e'),
+ OS_2 = TTF_TAG('O','S','/','2'),
+ post = TTF_TAG('p','o','s','t'),
+ prep = TTF_TAG('p','r','e','p')
+ };
+};
+
+/*----------------------------------------------------------------------------------------------
+ Class providing utility methods to parse a TrueType font file (TTF).
+ Callling application handles all file input and memory allocation.
+ Assumes minimal knowledge of TTF file format.
+----------------------------------------------------------------------------------------------*/
+ ////////////////////////////////// tools to find & check TTF tables
+ bool GetHeaderInfo(size_t & lOffset, size_t & lSize);
+ bool CheckHeader(const void * pHdr);
+ bool GetTableDirInfo(const void * pHdr, size_t & lOffset, size_t & lSize);
+ bool GetTableInfo(const Tag TableTag, const void * pHdr, const void * pTableDir,
+ size_t & lOffset, size_t & lSize);
+ bool CheckTable(const Tag TableId, const void * pTable, size_t lTableSize);
+
+ ////////////////////////////////// simple font wide info
+ size_t GlyphCount(const void * pMaxp);
+#ifdef ALL_TTFUTILS
+ size_t MaxCompositeComponentCount(const void * pMaxp);
+ size_t MaxCompositeLevelCount(const void * pMaxp);
+ size_t LocaGlyphCount(size_t lLocaSize, const void * pHead); // throw (std::domain_error);
+#endif
+ int DesignUnits(const void * pHead);
+#ifdef ALL_TTFUTILS
+ int HeadTableCheckSum(const void * pHead);
+ void HeadTableCreateTime(const void * pHead, unsigned int * pnDateBC, unsigned int * pnDateAD);
+ void HeadTableModifyTime(const void * pHead, unsigned int * pnDateBC, unsigned int * pnDateAD);
+ bool IsItalic(const void * pHead);
+ int FontAscent(const void * pOs2);
+ int FontDescent(const void * pOs2);
+ bool FontOs2Style(const void *pOs2, bool & fBold, bool & fItalic);
+ bool Get31EngFamilyInfo(const void * pName, size_t & lOffset, size_t & lSize);
+ bool Get31EngFullFontInfo(const void * pName, size_t & lOffset, size_t & lSize);
+ bool Get30EngFamilyInfo(const void * pName, size_t & lOffset, size_t & lSize);
+ bool Get30EngFullFontInfo(const void * pName, size_t & lOffset, size_t & lSize);
+ int PostLookup(const void * pPost, size_t lPostSize, const void * pMaxp,
+ const char * pPostName);
+#endif
+
+ ////////////////////////////////// utility methods helpful for name table
+ bool GetNameInfo(const void * pName, int nPlatformId, int nEncodingId,
+ int nLangId, int nNameId, size_t & lOffset, size_t & lSize);
+ //size_t NameTableLength(const byte * pTable);
+#ifdef ALL_TTFUTILS
+ int GetLangsForNames(const void * pName, int nPlatformId, int nEncodingId,
+ int *nameIdList, int cNameIds, short *langIdList);
+ void SwapWString(void * pWStr, size_t nSize = 0); // throw (std::invalid_argument);
+#endif
+
+ ////////////////////////////////// cmap lookup tools
+ const void * FindCmapSubtable(const void * pCmap, int nPlatformId = 3,
+ int nEncodingId = 1, size_t length = 0);
+ bool CheckCmapSubtable4(const void * pCmap31);
+ gid16 CmapSubtable4Lookup(const void * pCmapSubtabel4, unsigned int nUnicodeId, int rangeKey = 0);
+ unsigned int CmapSubtable4NextCodepoint(const void *pCmap31, unsigned int nUnicodeId,
+ int * pRangeKey = 0);
+ bool CheckCmapSubtable12(const void *pCmap310);
+ gid16 CmapSubtable12Lookup(const void * pCmap310, unsigned int uUnicodeId, int rangeKey = 0);
+ unsigned int CmapSubtable12NextCodepoint(const void *pCmap310, unsigned int nUnicodeId,
+ int * pRangeKey = 0);
+
+ ///////////////////////////////// horizontal metric data for a glyph
+ bool HorMetrics(gid16 nGlyphId, const void * pHmtx, size_t lHmtxSize,
+ const void * pHhea, int & nLsb, unsigned int & nAdvWid);
+
+ ////////////////////////////////// primitives for loca and glyf lookup
+ size_t LocaLookup(gid16 nGlyphId, const void * pLoca, size_t lLocaSize,
+ const void * pHead); // throw (std::out_of_range);
+ void * GlyfLookup(const void * pGlyf, size_t lGlyfOffset, size_t lTableLen);
+
+ ////////////////////////////////// primitves for simple glyph data
+ bool GlyfBox(const void * pSimpleGlyf, int & xMin, int & yMin,
+ int & xMax, int & yMax);
+
+#ifdef ALL_TTFUTILS
+ int GlyfContourCount(const void * pSimpleGlyf);
+ bool GlyfContourEndPoints(const void * pSimpleGlyf, int * prgnContourEndPoint,
+ int cnPointsTotal, size_t & cnPoints);
+ bool GlyfPoints(const void * pSimpleGlyf, int * prgnX, int * prgnY,
+ char * prgbFlag, int cnPointsTotal, int & cnPoints);
+
+ // primitive to find the glyph ids in a composite glyph
+ bool GetComponentGlyphIds(const void * pSimpleGlyf, int * prgnCompId,
+ size_t cnCompIdTotal, size_t & cnCompId);
+ // primitive to find the placement data for a component in a composite glyph
+ bool GetComponentPlacement(const void * pSimpleGlyf, int nCompId,
+ bool fOffset, int & a, int & b);
+ // primitive to find the transform data for a component in a composite glyph
+ bool GetComponentTransform(const void * pSimpleGlyf, int nCompId,
+ float & flt11, float & flt12, float & flt21, float & flt22, bool & fTransOffset);
+#endif
+
+ ////////////////////////////////// operate on composite or simple glyph (auto glyf lookup)
+ void * GlyfLookup(gid16 nGlyphId, const void * pGlyf, const void * pLoca,
+ size_t lGlyfSize, size_t lLocaSize, const void * pHead); // primitive used by below methods
+
+#ifdef ALL_TTFUTILS
+ // below are primary user methods for handling glyf data
+ bool IsSpace(gid16 nGlyphId, const void * pLoca, size_t lLocaSize, const void * pHead);
+ bool IsDeepComposite(gid16 nGlyphId, const void * pGlyf, const void * pLoca,
+ size_t lGlyfSize, size_t lLocaSize, const void * pHead);
+
+ bool GlyfBox(gid16 nGlyphId, const void * pGlyf, const void * pLoca, size_t lGlyfSize, size_t lLocaSize,
+ const void * pHead, int & xMin, int & yMin, int & xMax, int & yMax);
+ bool GlyfContourCount(gid16 nGlyphId, const void * pGlyf, const void * pLoca,
+ size_t lGlyfSize, size_t lLocaSize, const void *pHead, size_t & cnContours);
+ bool GlyfContourEndPoints(gid16 nGlyphId, const void * pGlyf, const void * pLoca,
+ size_t lGlyfSize, size_t lLocaSize, const void * pHead, int * prgnContourEndPoint, size_t cnPoints);
+ bool GlyfPoints(gid16 nGlyphId, const void * pGlyf, const void * pLoca,
+ size_t lGlyfSize, size_t lLocaSize, const void * pHead, const int * prgnContourEndPoint, size_t cnEndPoints,
+ int * prgnX, int * prgnY, bool * prgfOnCurve, size_t cnPoints);
+
+ // utitily method used by high-level GlyfPoints
+ bool SimplifyFlags(char * prgbFlags, int cnPoints);
+ bool CalcAbsolutePoints(int * prgnX, int * prgnY, int cnPoints);
+#endif
+
+} // end of namespace TtfUtil
+} // end of namespace graphite2