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