// SPDX-License-Identifier: MIT OR MPL-2.0 OR LGPL-2.1-or-later OR GPL-2.0-or-later // Copyright 2010, SIL International, All rights reserved. /* Responsibility: Alan Ward Last reviewed: Not yet. Description Implements the methods for TtfUtil class. This file should remain portable to any C++ environment by only using standard C++ and the TTF structurs defined in Tt.h. */ /*********************************************************************************************** Include files ***********************************************************************************************/ // Language headers //#include <algorithm> #include <cassert> #include <cstddef> #include <cstring> #include <climits> #include <cwchar> //#include <stdexcept> // Platform headers // Module headers #include "inc/TtfUtil.h" #include "inc/TtfTypes.h" #include "inc/Endian.h" /*********************************************************************************************** Forward declarations ***********************************************************************************************/ /*********************************************************************************************** Local Constants and static variables ***********************************************************************************************/ namespace { #ifdef ALL_TTFUTILS // max number of components allowed in composite glyphs const int kMaxGlyphComponents = 8; #endif template <int R, typename T> inline float fixed_to_float(const T f) { … } /*---------------------------------------------------------------------------------------------- Table of standard Postscript glyph names. From Martin Hosken. Disagress with ttfdump.exe ---------------------------------------------------------------------------------------------*/ #ifdef ALL_TTFUTILS const int kcPostNames = 258; const char * rgPostName[kcPostNames] = { ".notdef", ".null", "nonmarkingreturn", "space", "exclam", "quotedbl", "numbersign", "dollar", "percent", "ampersand", "quotesingle", "parenleft", "parenright", "asterisk", "plus", "comma", "hyphen", "period", "slash", "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "colon", "semicolon", "less", "equal", "greater", "question", "at", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "bracketleft", "backslash", "bracketright", "asciicircum", "underscore", "grave", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "braceleft", "bar", "braceright", "asciitilde", "Adieresis", "Aring", "Ccedilla", "Eacute", "Ntilde", "Odieresis", "Udieresis", "aacute", "agrave", "acircumflex", "adieresis", "atilde", "aring", "ccedilla", "eacute", "egrave", "ecircumflex", "edieresis", "iacute", "igrave", "icircumflex", "idieresis", "ntilde", "oacute", "ograve", "ocircumflex", "odieresis", "otilde", "uacute", "ugrave", "ucircumflex", "udieresis", "dagger", "degree", "cent", "sterling", "section", "bullet", "paragraph", "germandbls", "registered", "copyright", "trademark", "acute", "dieresis", "notequal", "AE", "Oslash", "infinity", "plusminus", "lessequal", "greaterequal", "yen", "mu", "partialdiff", "summation", "product", "pi", "integral", "ordfeminine", "ordmasculine", "Omega", "ae", "oslash", "questiondown", "exclamdown", "logicalnot", "radical", "florin", "approxequal", "Delta", "guillemotleft", "guillemotright", "ellipsis", "nonbreakingspace", "Agrave", "Atilde", "Otilde", "OE", "oe", "endash", "emdash", "quotedblleft", "quotedblright", "quoteleft", "quoteright", "divide", "lozenge", "ydieresis", "Ydieresis", "fraction", "currency", "guilsinglleft", "guilsinglright", "fi", "fl", "daggerdbl", "periodcentered", "quotesinglbase", "quotedblbase", "perthousand", "Acircumflex", "Ecircumflex", "Aacute", "Edieresis", "Egrave", "Iacute", "Icircumflex", "Idieresis", "Igrave", "Oacute", "Ocircumflex", "apple", "Ograve", "Uacute", "Ucircumflex", "Ugrave", "dotlessi", "circumflex", "tilde", "macron", "breve", "dotaccent", "ring", "cedilla", "hungarumlaut", "ogonek", "caron", "Lslash", "lslash", "Scaron", "scaron", "Zcaron", "zcaron", "brokenbar", "Eth", "eth", "Yacute", "yacute", "Thorn", "thorn", "minus", "multiply", "onesuperior", "twosuperior", "threesuperior", "onehalf", "onequarter", "threequarters", "franc", "Gbreve", "gbreve", "Idotaccent", "Scedilla", "scedilla", "Cacute", "cacute", "Ccaron", "ccaron", "dcroat" }; #endif } // end of namespace /*********************************************************************************************** Methods ***********************************************************************************************/ /* Note on error processing: The code guards against bad glyph ids being used to look up data in open ended tables (loca, hmtx). If the glyph id comes from a cmap this shouldn't happen but it seems prudent to check for user errors here. The code does assume that data obtained from the TTF file is valid otherwise (though the CheckTable method seeks to check for obvious problems that might accompany a change in table versions). For example an invalid offset in the loca table which could exceed the size of the glyf table is NOT trapped. Likewise if numberOf_LongHorMetrics in the hhea table is wrong, this will NOT be trapped, which could cause a lookup in the hmtx table to exceed the table length. Of course, TTF tables that are completely corrupt will cause unpredictable results. */ /* Note on composite glyphs: Glyphs that have components that are themselves composites are not supported. IsDeepComposite can be used to test for this. False is returned from many of the methods in this cases. It is unclear how to build composite glyphs in some cases, so this code represents my best guess until test cases can be found. See notes on the high- level GlyfPoints method. */ namespace graphite2 { namespace TtfUtil { /*---------------------------------------------------------------------------------------------- Get offset and size of the offset table needed to find table directory. Return true if success, false otherwise. lSize excludes any table directory entries. ----------------------------------------------------------------------------------------------*/ bool GetHeaderInfo(size_t & lOffset, size_t & lSize) { … } /*---------------------------------------------------------------------------------------------- Check the offset table for expected data. Return true if success, false otherwise. ----------------------------------------------------------------------------------------------*/ bool CheckHeader(const void * pHdr) { … } /*---------------------------------------------------------------------------------------------- Get offset and size of the table directory. Return true if successful, false otherwise. ----------------------------------------------------------------------------------------------*/ bool GetTableDirInfo(const void * pHdr, size_t & lOffset, size_t & lSize) { … } /*---------------------------------------------------------------------------------------------- Get offset and size of the specified table. Return true if successful, false otherwise. On false, offset and size will be 0. ----------------------------------------------------------------------------------------------*/ bool GetTableInfo(const Tag TableTag, const void * pHdr, const void * pTableDir, size_t & lOffset, size_t & lSize) { … } /*---------------------------------------------------------------------------------------------- Check the specified table. Tests depend on the table type. Return true if successful, false otherwise. ----------------------------------------------------------------------------------------------*/ bool CheckTable(const Tag TableId, const void * pTable, size_t lTableSize) { … } /*---------------------------------------------------------------------------------------------- Return the number of glyphs in the font. Should never be less than zero. Note: this method is not currently used by the Graphite engine. ----------------------------------------------------------------------------------------------*/ size_t GlyphCount(const void * pMaxp) { … } #ifdef ALL_TTFUTILS /*---------------------------------------------------------------------------------------------- Return the maximum number of components for any composite glyph in the font. Note: this method is not currently used by the Graphite engine. ----------------------------------------------------------------------------------------------*/ size_t MaxCompositeComponentCount(const void * pMaxp) { const Sfnt::MaximumProfile * pTable = reinterpret_cast<const Sfnt::MaximumProfile *>(pMaxp); return be::swap(pTable->max_component_elements); } /*---------------------------------------------------------------------------------------------- Composite glyphs can be composed of glyphs that are themselves composites. This method returns the maximum number of levels like this for any glyph in the font. A non-composite glyph has a level of 1. Note: this method is not currently used by the Graphite engine. ----------------------------------------------------------------------------------------------*/ size_t MaxCompositeLevelCount(const void * pMaxp) { const Sfnt::MaximumProfile * pTable = reinterpret_cast<const Sfnt::MaximumProfile *>(pMaxp); return be::swap(pTable->max_component_depth); } /*---------------------------------------------------------------------------------------------- Return the number of glyphs in the font according to a differt source. Should never be less than zero. Return -1 on failure. Note: this method is not currently used by the Graphite engine. ----------------------------------------------------------------------------------------------*/ size_t LocaGlyphCount(size_t lLocaSize, const void * pHead) //throw(std::domain_error) { const Sfnt::FontHeader * pTable = reinterpret_cast<const Sfnt::FontHeader *>(pHead); if (be::swap(pTable->index_to_loc_format) == Sfnt::FontHeader::ShortIndexLocFormat) // loca entries are two bytes and have been divided by two return (lLocaSize >> 1) - 1; if (be::swap(pTable->index_to_loc_format) == Sfnt::FontHeader::LongIndexLocFormat) // loca entries are four bytes return (lLocaSize >> 2) - 1; return -1; //throw std::domain_error("head table in inconsistent state. The font may be corrupted"); } #endif /*---------------------------------------------------------------------------------------------- Return the design units the font is designed with ----------------------------------------------------------------------------------------------*/ int DesignUnits(const void * pHead) { … } #ifdef ALL_TTFUTILS /*---------------------------------------------------------------------------------------------- Return the checksum from the head table, which serves as a unique identifer for the font. ----------------------------------------------------------------------------------------------*/ int HeadTableCheckSum(const void * pHead) { const Sfnt::FontHeader * pTable = reinterpret_cast<const Sfnt::FontHeader *>(pHead); return be::swap(pTable->check_sum_adjustment); } /*---------------------------------------------------------------------------------------------- Return the create time from the head table. This consists of a 64-bit integer, which we return here as two 32-bit integers. Note: this method is not currently used by the Graphite engine. ----------------------------------------------------------------------------------------------*/ void HeadTableCreateTime(const void * pHead, unsigned int * pnDateBC, unsigned int * pnDateAD) { const Sfnt::FontHeader * pTable = reinterpret_cast<const Sfnt::FontHeader *>(pHead); *pnDateBC = be::swap(pTable->created[0]); *pnDateAD = be::swap(pTable->created[1]); } /*---------------------------------------------------------------------------------------------- Return the modify time from the head table.This consists of a 64-bit integer, which we return here as two 32-bit integers. Note: this method is not currently used by the Graphite engine. ----------------------------------------------------------------------------------------------*/ void HeadTableModifyTime(const void * pHead, unsigned int * pnDateBC, unsigned int *pnDateAD) { const Sfnt::FontHeader * pTable = reinterpret_cast<const Sfnt::FontHeader *>(pHead); ; *pnDateBC = be::swap(pTable->modified[0]); *pnDateAD = be::swap(pTable->modified[1]); } /*---------------------------------------------------------------------------------------------- Return true if the font is italic. ----------------------------------------------------------------------------------------------*/ bool IsItalic(const void * pHead) { const Sfnt::FontHeader * pTable = reinterpret_cast<const Sfnt::FontHeader *>(pHead); return ((be::swap(pTable->mac_style) & 0x00000002) != 0); } /*---------------------------------------------------------------------------------------------- Return the ascent for the font ----------------------------------------------------------------------------------------------*/ int FontAscent(const void * pOs2) { const Sfnt::Compatibility * pTable = reinterpret_cast<const Sfnt::Compatibility *>(pOs2); return be::swap(pTable->win_ascent); } /*---------------------------------------------------------------------------------------------- Return the descent for the font ----------------------------------------------------------------------------------------------*/ int FontDescent(const void * pOs2) { const Sfnt::Compatibility * pTable = reinterpret_cast<const Sfnt::Compatibility *>(pOs2); return be::swap(pTable->win_descent); } /*---------------------------------------------------------------------------------------------- Get the bold and italic style bits. Return true if successful. false otherwise. In addition to checking the OS/2 table, one could also check the head table's macStyle field (overridden by the OS/2 table on Win) the sub-family name in the name table (though this can contain oblique, dark, etc too) ----------------------------------------------------------------------------------------------*/ bool FontOs2Style(const void *pOs2, bool & fBold, bool & fItalic) { const Sfnt::Compatibility * pTable = reinterpret_cast<const Sfnt::Compatibility *>(pOs2); fBold = (be::swap(pTable->fs_selection) & Sfnt::Compatibility::Bold) != 0; fItalic = (be::swap(pTable->fs_selection) & Sfnt::Compatibility::Italic) != 0; return true; } #endif /*---------------------------------------------------------------------------------------------- Method for searching name table. ----------------------------------------------------------------------------------------------*/ bool GetNameInfo(const void * pName, int nPlatformId, int nEncodingId, int nLangId, int nNameId, size_t & lOffset, size_t & lSize) { … } #ifdef ALL_TTFUTILS /*---------------------------------------------------------------------------------------------- Return all the lang-IDs that have data for the given name-IDs. Assume that there is room in the return array (langIdList) for 128 items. The purpose of this method is to return a list of all possible lang-IDs. ----------------------------------------------------------------------------------------------*/ int GetLangsForNames(const void * pName, int nPlatformId, int nEncodingId, int * nameIdList, int cNameIds, short * langIdList) { const Sfnt::FontNames * pTable = reinterpret_cast<const Sfnt::FontNames *>(pName); int cLangIds = 0; uint16 cRecord = be::swap(pTable->count); if (cRecord > 127) return cLangIds; //uint16 nRecordOffset = swapw(pTable->stringOffset); const Sfnt::NameRecord * pRecord = reinterpret_cast<const Sfnt::NameRecord *>(pTable + 1); for (int i = 0; i < cRecord; ++i) { if (be::swap(pRecord->platform_id) == nPlatformId && be::swap(pRecord->platform_specific_id) == nEncodingId) { bool fNameFound = false; int nLangId = be::swap(pRecord->language_id); int nNameId = be::swap(pRecord->name_id); for (int j = 0; j < cNameIds; j++) { if (nNameId == nameIdList[j]) { fNameFound = true; break; } } if (fNameFound) { // Add it if it's not there. int ilang; for (ilang = 0; ilang < cLangIds; ilang++) if (langIdList[ilang] == nLangId) break; if (ilang >= cLangIds) { langIdList[cLangIds] = short(nLangId); cLangIds++; } if (cLangIds == 128) return cLangIds; } } pRecord++; } return cLangIds; } /*---------------------------------------------------------------------------------------------- Get the offset and size of the font family name in English for the MS Platform with Unicode writing system. The offset is within the pName data. The string is double byte with MSB first. ----------------------------------------------------------------------------------------------*/ bool Get31EngFamilyInfo(const void * pName, size_t & lOffset, size_t & lSize) { return GetNameInfo(pName, Sfnt::NameRecord::Microsoft, 1, 1033, Sfnt::NameRecord::Family, lOffset, lSize); } /*---------------------------------------------------------------------------------------------- Get the offset and size of the full font name in English for the MS Platform with Unicode writing system. The offset is within the pName data. The string is double byte with MSB first. Note: this method is not currently used by the Graphite engine. ----------------------------------------------------------------------------------------------*/ bool Get31EngFullFontInfo(const void * pName, size_t & lOffset, size_t & lSize) { return GetNameInfo(pName, Sfnt::NameRecord::Microsoft, 1, 1033, Sfnt::NameRecord::Fullname, lOffset, lSize); } /*---------------------------------------------------------------------------------------------- Get the offset and size of the font family name in English for the MS Platform with Symbol writing system. The offset is within the pName data. The string is double byte with MSB first. ----------------------------------------------------------------------------------------------*/ bool Get30EngFamilyInfo(const void * pName, size_t & lOffset, size_t & lSize) { return GetNameInfo(pName, Sfnt::NameRecord::Microsoft, 0, 1033, Sfnt::NameRecord::Family, lOffset, lSize); } /*---------------------------------------------------------------------------------------------- Get the offset and size of the full font name in English for the MS Platform with Symbol writing system. The offset is within the pName data. The string is double byte with MSB first. Note: this method is not currently used by the Graphite engine. ----------------------------------------------------------------------------------------------*/ bool Get30EngFullFontInfo(const void * pName, size_t & lOffset, size_t & lSize) { return GetNameInfo(pName, Sfnt::NameRecord::Microsoft, 0, 1033, Sfnt::NameRecord::Fullname, lOffset, lSize); } /*---------------------------------------------------------------------------------------------- Return the Glyph ID for a given Postscript name. This method finds the first glyph which matches the requested Postscript name. Ideally every glyph should have a unique Postscript name (except for special names such as .notdef), but this is not always true. On failure return value less than zero. -1 - table search failed -2 - format 3 table (no Postscript glyph info) -3 - other failures Note: this method is not currently used by the Graphite engine. ----------------------------------------------------------------------------------------------*/ int PostLookup(const void * pPost, size_t lPostSize, const void * pMaxp, const char * pPostName) { using namespace Sfnt; const Sfnt::PostScriptGlyphName * pTable = reinterpret_cast<const Sfnt::PostScriptGlyphName *>(pPost); fixed format = be::swap(pTable->format); if (format == PostScriptGlyphName::Format3) { // format 3 - no Postscript glyph info in font return -2; } // search for given Postscript name among the standard names int iPostName = -1; // index in standard names for (int i = 0; i < kcPostNames; i++) { if (!strcmp(pPostName, rgPostName[i])) { iPostName = i; break; } } if (format == PostScriptGlyphName::Format1) { // format 1 - use standard Postscript names return iPostName; } if (format == PostScriptGlyphName::Format25) { if (iPostName == -1) return -1; const PostScriptGlyphName25 * pTable25 = static_cast<const PostScriptGlyphName25 *>(pTable); int cnGlyphs = GlyphCount(pMaxp); for (gid16 nGlyphId = 0; nGlyphId < cnGlyphs && nGlyphId < kcPostNames; nGlyphId++) { // glyph_name_index25 contains bytes so no byte swapping needed // search for first glyph id that uses the standard name if (nGlyphId + pTable25->offset[nGlyphId] == iPostName) return nGlyphId; } } if (format == PostScriptGlyphName::Format2) { // format 2 const PostScriptGlyphName2 * pTable2 = static_cast<const PostScriptGlyphName2 *>(pTable); int cnGlyphs = be::swap(pTable2->number_of_glyphs); if (iPostName != -1) { // did match a standard name, look for first glyph id mapped to that name for (gid16 nGlyphId = 0; nGlyphId < cnGlyphs; nGlyphId++) { if (be::swap(pTable2->glyph_name_index[nGlyphId]) == iPostName) return nGlyphId; } } { // did not match a standard name, search font specific names size_t nStrSizeGoal = strlen(pPostName); const char * pFirstGlyphName = reinterpret_cast<const char *>( &pTable2->glyph_name_index[0] + cnGlyphs); const char * pGlyphName = pFirstGlyphName; int iInNames = 0; // index in font specific names bool fFound = false; const char * const endOfTable = reinterpret_cast<const char *>(pTable2) + lPostSize; while (pGlyphName < endOfTable && !fFound) { // search Pascal strings for first matching name size_t nStringSize = size_t(*pGlyphName); if (nStrSizeGoal != nStringSize || strncmp(pGlyphName + 1, pPostName, nStringSize)) { // did not match ++iInNames; pGlyphName += nStringSize + 1; } else { // did match fFound = true; } } if (!fFound) return -1; // no font specific name matches request iInNames += kcPostNames; for (gid16 nGlyphId = 0; nGlyphId < cnGlyphs; nGlyphId++) { // search for first glyph id that maps to the found string index if (be::swap(pTable2->glyph_name_index[nGlyphId]) == iInNames) return nGlyphId; } return -1; // no glyph mapped to this index (very strange) } } return -3; } /*---------------------------------------------------------------------------------------------- Convert a Unicode character string from big endian (MSB first, Motorola) format to little endian (LSB first, Intel) format. nSize is the number of Unicode characters in the string. It should not include any terminating null. If nSize is 0, it is assumed the string is null terminated. nSize defaults to 0. Return true if successful, false otherwise. ----------------------------------------------------------------------------------------------*/ void SwapWString(void * pWStr, size_t nSize /* = 0 */) //throw (std::invalid_argument) { if (pWStr == 0) { // throw std::invalid_argument("null pointer given"); return; } uint16 * pStr = reinterpret_cast<uint16 *>(pWStr); uint16 * const pStrEnd = pStr + (nSize == 0 ? wcslen((const wchar_t*)pStr) : nSize); for (; pStr != pStrEnd; ++pStr) *pStr = be::swap(*pStr); // std::transform(pStr, pStrEnd, pStr, read<uint16>); // for (int i = 0; i < nSize; i++) // { // swap the wide characters in the string // pStr[i] = utf16(be::swap(uint16(pStr[i]))); // } } #endif /*---------------------------------------------------------------------------------------------- Get the left-side bearing and and advance width based on the given tables and Glyph ID Return true if successful, false otherwise. On false, one or both value could be INT_MIN ----------------------------------------------------------------------------------------------*/ bool HorMetrics(gid16 nGlyphId, const void * pHmtx, size_t lHmtxSize, const void * pHhea, int & nLsb, unsigned int & nAdvWid) { … } /*---------------------------------------------------------------------------------------------- Return a pointer to the requested cmap subtable. By default find the Microsoft Unicode subtable. Pass nEncoding as -1 to find first table that matches only nPlatformId. Return NULL if the subtable cannot be found. ----------------------------------------------------------------------------------------------*/ const void * FindCmapSubtable(const void * pCmap, int nPlatformId, /* =3 */ int nEncodingId, /* = 1 */ size_t length) { … } /*---------------------------------------------------------------------------------------------- Check the Microsoft Unicode subtable for expected values ----------------------------------------------------------------------------------------------*/ bool CheckCmapSubtable4(const void * pCmapSubtable4, const void * pCmapEnd /*, unsigned int maxgid*/) { … } /*---------------------------------------------------------------------------------------------- Return the Glyph ID for the given Unicode ID in the Microsoft Unicode subtable. (Actually this code only depends on subtable being format 4.) Return 0 if the Unicode ID is not in the subtable. ----------------------------------------------------------------------------------------------*/ gid16 CmapSubtable4Lookup(const void * pCmapSubtabel4, unsigned int nUnicodeId, int rangeKey) { … } /*---------------------------------------------------------------------------------------------- Return the next Unicode value in the cmap. Pass 0 to obtain the first item. Returns 0xFFFF as the last item. pRangeKey is an optional key that is used to optimize the search; its value is the range in which the character is found. ----------------------------------------------------------------------------------------------*/ unsigned int CmapSubtable4NextCodepoint(const void *pCmap31, unsigned int nUnicodeId, int * pRangeKey) { … } /*---------------------------------------------------------------------------------------------- Check the Microsoft UCS-4 subtable for expected values. ----------------------------------------------------------------------------------------------*/ bool CheckCmapSubtable12(const void *pCmapSubtable12, const void *pCmapEnd /*, unsigned int maxgid*/) { … } /*---------------------------------------------------------------------------------------------- Return the Glyph ID for the given Unicode ID in the Microsoft UCS-4 subtable. (Actually this code only depends on subtable being format 12.) Return 0 if the Unicode ID is not in the subtable. ----------------------------------------------------------------------------------------------*/ gid16 CmapSubtable12Lookup(const void * pCmap310, unsigned int uUnicodeId, int rangeKey) { … } /*---------------------------------------------------------------------------------------------- Return the next Unicode value in the cmap. Pass 0 to obtain the first item. Returns 0x10FFFF as the last item. pRangeKey is an optional key that is used to optimize the search; its value is the range in which the character is found. ----------------------------------------------------------------------------------------------*/ unsigned int CmapSubtable12NextCodepoint(const void *pCmap310, unsigned int nUnicodeId, int * pRangeKey) { … } /*---------------------------------------------------------------------------------------------- Return the offset stored in the loca table for the given Glyph ID. (This offset is into the glyf table.) Return -1 if the lookup failed. Technically this method should return an unsigned long but it is unlikely the offset will exceed 2^31. ----------------------------------------------------------------------------------------------*/ size_t LocaLookup(gid16 nGlyphId, const void * pLoca, size_t lLocaSize, const void * pHead) // throw (std::out_of_range) { … } /*---------------------------------------------------------------------------------------------- Return a pointer into the glyf table based on the given offset (from LocaLookup). Return NULL on error. ----------------------------------------------------------------------------------------------*/ void * GlyfLookup(const void * pGlyf, size_t nGlyfOffset, size_t nTableLen) { … } /*---------------------------------------------------------------------------------------------- Get the bounding box coordinates for a simple glyf entry (non-composite). Return true if successful, false otherwise. ----------------------------------------------------------------------------------------------*/ bool GlyfBox(const void * pSimpleGlyf, int & xMin, int & yMin, int & xMax, int & yMax) { … } #ifdef ALL_TTFUTILS /*---------------------------------------------------------------------------------------------- Return the number of contours for a simple glyf entry (non-composite) Returning -1 means this is a composite glyph ----------------------------------------------------------------------------------------------*/ int GlyfContourCount(const void * pSimpleGlyf) { const Sfnt::Glyph * pGlyph = reinterpret_cast<const Sfnt::Glyph *>(pSimpleGlyf); return be::swap(pGlyph->number_of_contours); // -1 means composite glyph } /*---------------------------------------------------------------------------------------------- Get the point numbers for the end points of the glyph contours for a simple glyf entry (non-composite). cnPointsTotal - count of contours from GlyfContourCount(); (same as number of end points) prgnContourEndPoints - should point to a buffer large enough to hold cnPoints integers cnPoints - count of points placed in above range Return true if successful, false otherwise. False could indicate a multi-level composite glyphs. ----------------------------------------------------------------------------------------------*/ bool GlyfContourEndPoints(const void * pSimpleGlyf, int * prgnContourEndPoint, int cnPointsTotal, int & cnPoints) { const Sfnt::SimpleGlyph * pGlyph = reinterpret_cast<const Sfnt::SimpleGlyph *>(pSimpleGlyf); int cContours = be::swap(pGlyph->number_of_contours); if (cContours < 0) return false; // this method isn't supposed handle composite glyphs for (int i = 0; i < cContours && i < cnPointsTotal; i++) { prgnContourEndPoint[i] = be::swap(pGlyph->end_pts_of_contours[i]); } cnPoints = cContours; return true; } /*---------------------------------------------------------------------------------------------- Get the points for a simple glyf entry (non-composite) cnPointsTotal - count of points from largest end point obtained from GlyfContourEndPoints prgnX & prgnY - should point to buffers large enough to hold cnPointsTotal integers The ranges are parallel so that coordinates for point(n) are found at offset n in both ranges. This is raw point data with relative coordinates. prgbFlag - should point to a buffer a large enough to hold cnPointsTotal bytes This range is parallel to the prgnX & prgnY cnPoints - count of points placed in above ranges Return true if successful, false otherwise. False could indicate a composite glyph ----------------------------------------------------------------------------------------------*/ bool GlyfPoints(const void * pSimpleGlyf, int * prgnX, int * prgnY, char * prgbFlag, int cnPointsTotal, int & cnPoints) { using namespace Sfnt; const Sfnt::SimpleGlyph * pGlyph = reinterpret_cast<const Sfnt::SimpleGlyph *>(pSimpleGlyf); int cContours = be::swap(pGlyph->number_of_contours); // return false for composite glyph if (cContours <= 0) return false; int cPts = be::swap(pGlyph->end_pts_of_contours[cContours - 1]) + 1; if (cPts > cnPointsTotal) return false; // skip over bounding box data & point to byte count of instructions (hints) const uint8 * pbGlyph = reinterpret_cast<const uint8 *> (&pGlyph->end_pts_of_contours[cContours]); // skip over hints & point to first flag int cbHints = be::swap(*(uint16 *)pbGlyph); pbGlyph += sizeof(uint16); pbGlyph += cbHints; // load flags & point to first x coordinate int iFlag = 0; while (iFlag < cPts) { if (!(*pbGlyph & SimpleGlyph::Repeat)) { // flag isn't repeated prgbFlag[iFlag] = (char)*pbGlyph; pbGlyph++; iFlag++; } else { // flag is repeated; count specified by next byte char chFlag = (char)*pbGlyph; pbGlyph++; int cFlags = (int)*pbGlyph; pbGlyph++; prgbFlag[iFlag] = chFlag; iFlag++; for (int i = 0; i < cFlags; i++) { prgbFlag[iFlag + i] = chFlag; } iFlag += cFlags; } } if (iFlag != cPts) return false; // load x coordinates iFlag = 0; while (iFlag < cPts) { if (prgbFlag[iFlag] & SimpleGlyph::XShort) { prgnX[iFlag] = *pbGlyph; if (!(prgbFlag[iFlag] & SimpleGlyph::XIsPos)) { prgnX[iFlag] = -prgnX[iFlag]; } pbGlyph++; } else { if (prgbFlag[iFlag] & SimpleGlyph::XIsSame) { prgnX[iFlag] = 0; // do NOT increment pbGlyph } else { prgnX[iFlag] = be::swap(*(int16 *)pbGlyph); pbGlyph += sizeof(int16); } } iFlag++; } // load y coordinates iFlag = 0; while (iFlag < cPts) { if (prgbFlag[iFlag] & SimpleGlyph::YShort) { prgnY[iFlag] = *pbGlyph; if (!(prgbFlag[iFlag] & SimpleGlyph::YIsPos)) { prgnY[iFlag] = -prgnY[iFlag]; } pbGlyph++; } else { if (prgbFlag[iFlag] & SimpleGlyph::YIsSame) { prgnY[iFlag] = 0; // do NOT increment pbGlyph } else { prgnY[iFlag] = be::swap(*(int16 *)pbGlyph); pbGlyph += sizeof(int16); } } iFlag++; } cnPoints = cPts; return true; } /*---------------------------------------------------------------------------------------------- Fill prgnCompId with the component Glyph IDs from pSimpleGlyf. Client must allocate space before calling. pSimpleGlyf - assumed to point to a composite glyph cCompIdTotal - the number of elements in prgnCompId cCompId - the total number of Glyph IDs stored in prgnCompId Return true if successful, false otherwise False could indicate a non-composite glyph or the input array was not big enough ----------------------------------------------------------------------------------------------*/ bool GetComponentGlyphIds(const void * pSimpleGlyf, int * prgnCompId, size_t cnCompIdTotal, size_t & cnCompId) { using namespace Sfnt; if (GlyfContourCount(pSimpleGlyf) >= 0) return false; const Sfnt::SimpleGlyph * pGlyph = reinterpret_cast<const Sfnt::SimpleGlyph *>(pSimpleGlyf); // for a composite glyph, the special data begins here const uint8 * pbGlyph = reinterpret_cast<const uint8 *>(&pGlyph->end_pts_of_contours[0]); uint16 GlyphFlags; size_t iCurrentComp = 0; do { GlyphFlags = be::swap(*((uint16 *)pbGlyph)); pbGlyph += sizeof(uint16); prgnCompId[iCurrentComp++] = be::swap(*((uint16 *)pbGlyph)); pbGlyph += sizeof(uint16); if (iCurrentComp >= cnCompIdTotal) return false; int nOffset = 0; nOffset += GlyphFlags & CompoundGlyph::Arg1Arg2Words ? 4 : 2; nOffset += GlyphFlags & CompoundGlyph::HaveScale ? 2 : 0; nOffset += GlyphFlags & CompoundGlyph::HaveXAndYScale ? 4 : 0; nOffset += GlyphFlags & CompoundGlyph::HaveTwoByTwo ? 8 : 0; pbGlyph += nOffset; } while (GlyphFlags & CompoundGlyph::MoreComponents); cnCompId = iCurrentComp; return true; } /*---------------------------------------------------------------------------------------------- Return info on how a component glyph is to be placed pSimpleGlyph - assumed to point to a composite glyph nCompId - glyph id for component of interest bOffset - if true, a & b are the x & y offsets for this component if false, b is the point on this component that is attaching to point a on the preceding glyph Return true if successful, false otherwise False could indicate a non-composite glyph or that component wasn't found ----------------------------------------------------------------------------------------------*/ bool GetComponentPlacement(const void * pSimpleGlyf, int nCompId, bool fOffset, int & a, int & b) { using namespace Sfnt; if (GlyfContourCount(pSimpleGlyf) >= 0) return false; const Sfnt::SimpleGlyph * pGlyph = reinterpret_cast<const Sfnt::SimpleGlyph *>(pSimpleGlyf); // for a composite glyph, the special data begins here const uint8 * pbGlyph = reinterpret_cast<const uint8 *>(&pGlyph->end_pts_of_contours[0]); uint16 GlyphFlags; do { GlyphFlags = be::swap(*((uint16 *)pbGlyph)); pbGlyph += sizeof(uint16); if (be::swap(*((uint16 *)pbGlyph)) == nCompId) { pbGlyph += sizeof(uint16); // skip over glyph id of component fOffset = (GlyphFlags & CompoundGlyph::ArgsAreXYValues) == CompoundGlyph::ArgsAreXYValues; if (GlyphFlags & CompoundGlyph::Arg1Arg2Words ) { a = be::swap(*(int16 *)pbGlyph); pbGlyph += sizeof(int16); b = be::swap(*(int16 *)pbGlyph); pbGlyph += sizeof(int16); } else { // args are signed bytes a = *pbGlyph++; b = *pbGlyph++; } return true; } pbGlyph += sizeof(uint16); // skip over glyph id of component int nOffset = 0; nOffset += GlyphFlags & CompoundGlyph::Arg1Arg2Words ? 4 : 2; nOffset += GlyphFlags & CompoundGlyph::HaveScale ? 2 : 0; nOffset += GlyphFlags & CompoundGlyph::HaveXAndYScale ? 4 : 0; nOffset += GlyphFlags & CompoundGlyph::HaveTwoByTwo ? 8 : 0; pbGlyph += nOffset; } while (GlyphFlags & CompoundGlyph::MoreComponents); // didn't find requested component fOffset = true; a = 0; b = 0; return false; } /*---------------------------------------------------------------------------------------------- Return info on how a component glyph is to be transformed pSimpleGlyph - assumed to point to a composite glyph nCompId - glyph id for component of interest flt11, flt11, flt11, flt11 - a 2x2 matrix giving the transform bTransOffset - whether to transform the offset from above method The spec is unclear about the meaning of this flag Currently - initialize to true for MS rasterizer and false for Mac rasterizer, then on return it will indicate whether transform should apply to offset (MSDN CD 10/99) Return true if successful, false otherwise False could indicate a non-composite glyph or that component wasn't found ----------------------------------------------------------------------------------------------*/ bool GetComponentTransform(const void * pSimpleGlyf, int nCompId, float & flt11, float & flt12, float & flt21, float & flt22, bool & fTransOffset) { using namespace Sfnt; if (GlyfContourCount(pSimpleGlyf) >= 0) return false; const Sfnt::SimpleGlyph * pGlyph = reinterpret_cast<const Sfnt::SimpleGlyph *>(pSimpleGlyf); // for a composite glyph, the special data begins here const uint8 * pbGlyph = reinterpret_cast<const uint8 *>(&pGlyph->end_pts_of_contours[0]); uint16 GlyphFlags; do { GlyphFlags = be::swap(*((uint16 *)pbGlyph)); pbGlyph += sizeof(uint16); if (be::swap(*((uint16 *)pbGlyph)) == nCompId) { pbGlyph += sizeof(uint16); // skip over glyph id of component pbGlyph += GlyphFlags & CompoundGlyph::Arg1Arg2Words ? 4 : 2; // skip over placement data if (fTransOffset) // MS rasterizer fTransOffset = !(GlyphFlags & CompoundGlyph::UnscaledOffset); else // Apple rasterizer fTransOffset = (GlyphFlags & CompoundGlyph::ScaledOffset) != 0; if (GlyphFlags & CompoundGlyph::HaveScale) { flt11 = fixed_to_float<14>(be::swap(*(uint16 *)pbGlyph)); pbGlyph += sizeof(uint16); flt12 = 0; flt21 = 0; flt22 = flt11; } else if (GlyphFlags & CompoundGlyph::HaveXAndYScale) { flt11 = fixed_to_float<14>(be::swap(*(uint16 *)pbGlyph)); pbGlyph += sizeof(uint16); flt12 = 0; flt21 = 0; flt22 = fixed_to_float<14>(be::swap(*(uint16 *)pbGlyph)); pbGlyph += sizeof(uint16); } else if (GlyphFlags & CompoundGlyph::HaveTwoByTwo) { flt11 = fixed_to_float<14>(be::swap(*(uint16 *)pbGlyph)); pbGlyph += sizeof(uint16); flt12 = fixed_to_float<14>(be::swap(*(uint16 *)pbGlyph)); pbGlyph += sizeof(uint16); flt21 = fixed_to_float<14>(be::swap(*(uint16 *)pbGlyph)); pbGlyph += sizeof(uint16); flt22 = fixed_to_float<14>(be::swap(*(uint16 *)pbGlyph)); pbGlyph += sizeof(uint16); } else { // identity transform flt11 = 1.0; flt12 = 0.0; flt21 = 0.0; flt22 = 1.0; } return true; } pbGlyph += sizeof(uint16); // skip over glyph id of component int nOffset = 0; nOffset += GlyphFlags & CompoundGlyph::Arg1Arg2Words ? 4 : 2; nOffset += GlyphFlags & CompoundGlyph::HaveScale ? 2 : 0; nOffset += GlyphFlags & CompoundGlyph::HaveXAndYScale ? 4 : 0; nOffset += GlyphFlags & CompoundGlyph::HaveTwoByTwo ? 8 : 0; pbGlyph += nOffset; } while (GlyphFlags & CompoundGlyph::MoreComponents); // didn't find requested component fTransOffset = false; flt11 = 1; flt12 = 0; flt21 = 0; flt22 = 1; return false; } #endif /*---------------------------------------------------------------------------------------------- Return a pointer into the glyf table based on the given tables and Glyph ID Since this method doesn't check for spaces, it is good to call IsSpace before using it. Return NULL on error. ----------------------------------------------------------------------------------------------*/ void * GlyfLookup(gid16 nGlyphId, const void * pGlyf, const void * pLoca, size_t lGlyfSize, size_t lLocaSize, const void * pHead) { … } #ifdef ALL_TTFUTILS /*---------------------------------------------------------------------------------------------- Determine if a particular Glyph ID has any data in the glyf table. If it is white space, there will be no glyf data, though there will be metric data in hmtx, etc. ----------------------------------------------------------------------------------------------*/ bool IsSpace(gid16 nGlyphId, const void * pLoca, size_t lLocaSize, const void * pHead) { size_t lGlyfOffset = LocaLookup(nGlyphId, pLoca, lLocaSize, pHead); // the +1 should always work because there is a sentinel value at the end of the loca table size_t lNextGlyfOffset = LocaLookup(nGlyphId + 1, pLoca, lLocaSize, pHead); return (lNextGlyfOffset - lGlyfOffset) == 0; } /*---------------------------------------------------------------------------------------------- Determine if a particular Glyph ID is a multi-level composite. ----------------------------------------------------------------------------------------------*/ bool IsDeepComposite(gid16 nGlyphId, const void * pGlyf, const void * pLoca, size_t lGlyfSize, long lLocaSize, const void * pHead) { if (IsSpace(nGlyphId, pLoca, lLocaSize, pHead)) {return false;} void * pSimpleGlyf = GlyfLookup(nGlyphId, pGlyf, pLoca, lGlyfSize, lLocaSize, pHead); if (pSimpleGlyf == NULL) return false; // no way to really indicate an error occured here if (GlyfContourCount(pSimpleGlyf) >= 0) return false; int rgnCompId[kMaxGlyphComponents]; // assumes only a limited number of glyph components size_t cCompIdTotal = kMaxGlyphComponents; size_t cCompId = 0; if (!GetComponentGlyphIds(pSimpleGlyf, rgnCompId, cCompIdTotal, cCompId)) return false; for (size_t i = 0; i < cCompId; i++) { pSimpleGlyf = GlyfLookup(static_cast<gid16>(rgnCompId[i]), pGlyf, pLoca, lGlyfSize, lLocaSize, pHead); if (pSimpleGlyf == NULL) {return false;} if (GlyfContourCount(pSimpleGlyf) < 0) return true; } return false; } /*---------------------------------------------------------------------------------------------- Get the bounding box coordinates based on the given tables and Glyph ID Handles both simple and composite glyphs. Return true if successful, false otherwise. On false, all point values will be INT_MIN False may indicate a white space glyph ----------------------------------------------------------------------------------------------*/ 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) { xMin = yMin = xMax = yMax = INT_MIN; if (IsSpace(nGlyphId, pLoca, lLocaSize, pHead)) {return false;} void * pSimpleGlyf = GlyfLookup(nGlyphId, pGlyf, pLoca, lGlyfSize, lLocaSize, pHead); if (pSimpleGlyf == NULL) {return false;} return GlyfBox(pSimpleGlyf, xMin, yMin, xMax, yMax); } /*---------------------------------------------------------------------------------------------- Get the number of contours based on the given tables and Glyph ID Handles both simple and composite glyphs. Return true if successful, false otherwise. On false, cnContours will be INT_MIN False may indicate a white space glyph or a multi-level composite glyph. ----------------------------------------------------------------------------------------------*/ bool GlyfContourCount(gid16 nGlyphId, const void * pGlyf, const void * pLoca, size_t lGlyfSize, size_t lLocaSize, const void * pHead, size_t & cnContours) { cnContours = static_cast<size_t>(INT_MIN); if (IsSpace(nGlyphId, pLoca, lLocaSize, pHead)) {return false;} void * pSimpleGlyf = GlyfLookup(nGlyphId, pGlyf, pLoca, lGlyfSize, lLocaSize, pHead); if (pSimpleGlyf == NULL) {return false;} int cRtnContours = GlyfContourCount(pSimpleGlyf); if (cRtnContours >= 0) { cnContours = size_t(cRtnContours); return true; } //handle composite glyphs int rgnCompId[kMaxGlyphComponents]; // assumes no glyph will be made of more than 8 components size_t cCompIdTotal = kMaxGlyphComponents; size_t cCompId = 0; if (!GetComponentGlyphIds(pSimpleGlyf, rgnCompId, cCompIdTotal, cCompId)) return false; cRtnContours = 0; int cTmp = 0; for (size_t i = 0; i < cCompId; i++) { if (IsSpace(static_cast<gid16>(rgnCompId[i]), pLoca, lLocaSize, pHead)) {return false;} pSimpleGlyf = GlyfLookup(static_cast<gid16>(rgnCompId[i]), pGlyf, pLoca, lGlyfSize, lLocaSize, pHead); if (pSimpleGlyf == 0) {return false;} // return false on multi-level composite if ((cTmp = GlyfContourCount(pSimpleGlyf)) < 0) return false; cRtnContours += cTmp; } cnContours = size_t(cRtnContours); return true; } /*---------------------------------------------------------------------------------------------- Get the point numbers for the end points of the glyph contours based on the given tables and Glyph ID Handles both simple and composite glyphs. cnPoints - count of contours from GlyfContourCount (same as number of end points) prgnContourEndPoints - should point to a buffer large enough to hold cnPoints integers Return true if successful, false otherwise. On false, all end points are INT_MIN False may indicate a white space glyph or a multi-level composite glyph. ----------------------------------------------------------------------------------------------*/ bool GlyfContourEndPoints(gid16 nGlyphId, const void * pGlyf, const void * pLoca, size_t lGlyfSize, size_t lLocaSize, const void * pHead, int * prgnContourEndPoint, size_t cnPoints) { memset(prgnContourEndPoint, 0xFF, cnPoints * sizeof(int)); // std::fill_n(prgnContourEndPoint, cnPoints, INT_MIN); if (IsSpace(nGlyphId, pLoca, lLocaSize, pHead)) {return false;} void * pSimpleGlyf = GlyfLookup(nGlyphId, pGlyf, pLoca, lGlyfSize, lLocaSize, pHead); if (pSimpleGlyf == NULL) {return false;} int cContours = GlyfContourCount(pSimpleGlyf); int cActualPts = 0; if (cContours > 0) return GlyfContourEndPoints(pSimpleGlyf, prgnContourEndPoint, cnPoints, cActualPts); // handle composite glyphs int rgnCompId[kMaxGlyphComponents]; // assumes no glyph will be made of more than 8 components size_t cCompIdTotal = kMaxGlyphComponents; size_t cCompId = 0; if (!GetComponentGlyphIds(pSimpleGlyf, rgnCompId, cCompIdTotal, cCompId)) return false; int * prgnCurrentEndPoint = prgnContourEndPoint; int cCurrentPoints = cnPoints; int nPrevPt = 0; for (size_t i = 0; i < cCompId; i++) { if (IsSpace(static_cast<gid16>(rgnCompId[i]), pLoca, lLocaSize, pHead)) {return false;} pSimpleGlyf = GlyfLookup(static_cast<gid16>(rgnCompId[i]), pGlyf, pLoca, lGlyfSize, lLocaSize, pHead); if (pSimpleGlyf == NULL) {return false;} // returns false on multi-level composite if (!GlyfContourEndPoints(pSimpleGlyf, prgnCurrentEndPoint, cCurrentPoints, cActualPts)) return false; // points in composite are numbered sequentially as components are added // must adjust end point numbers for new point numbers for (int j = 0; j < cActualPts; j++) prgnCurrentEndPoint[j] += nPrevPt; nPrevPt = prgnCurrentEndPoint[cActualPts - 1] + 1; prgnCurrentEndPoint += cActualPts; cCurrentPoints -= cActualPts; } return true; } /*---------------------------------------------------------------------------------------------- Get the points for a glyph based on the given tables and Glyph ID Handles both simple and composite glyphs. cnPoints - count of points from largest end point obtained from GlyfContourEndPoints prgnX & prgnY - should point to buffers large enough to hold cnPoints integers The ranges are parallel so that coordinates for point(n) are found at offset n in both ranges. These points are in absolute coordinates. prgfOnCurve - should point to a buffer a large enough to hold cnPoints bytes (bool) This range is parallel to the prgnX & prgnY Return true if successful, false otherwise. On false, all points may be INT_MIN False may indicate a white space glyph, a multi-level composite, or a corrupt font It's not clear from the TTF spec when the transforms should be applied. Should the transform be done before or after attachment point calcs? (current code - before) Should the transform be applied to other offsets? (currently - no; however commented out code is in place so that if CompoundGlyph::UnscaledOffset on the MS rasterizer is clear (typical) then yes, and if CompoundGlyph::ScaledOffset on the Apple rasterizer is clear (typical?) then no). See GetComponentTransform. It's also unclear where point numbering with attachment poinst starts (currently - first point number is relative to whole glyph, second point number is relative to current glyph). ----------------------------------------------------------------------------------------------*/ 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) { memset(prgnX, 0x7F, cnPoints * sizeof(int)); memset(prgnY, 0x7F, cnPoints * sizeof(int)); if (IsSpace(nGlyphId, pLoca, lLocaSize, pHead)) return false; void * pSimpleGlyf = GlyfLookup(nGlyphId, pGlyf, pLoca, lGlyfSize, lLocaSize, pHead); if (pSimpleGlyf == NULL) return false; int cContours = GlyfContourCount(pSimpleGlyf); int cActualPts; if (cContours > 0) { if (!GlyfPoints(pSimpleGlyf, prgnX, prgnY, (char *)prgfOnCurve, cnPoints, cActualPts)) return false; CalcAbsolutePoints(prgnX, prgnY, cnPoints); SimplifyFlags((char *)prgfOnCurve, cnPoints); return true; } // handle composite glyphs int rgnCompId[kMaxGlyphComponents]; // assumes no glyph will be made of more than 8 components size_t cCompIdTotal = kMaxGlyphComponents; size_t cCompId = 0; // this will fail if there are more components than there is room for if (!GetComponentGlyphIds(pSimpleGlyf, rgnCompId, cCompIdTotal, cCompId)) return false; int * prgnCurrentX = prgnX; int * prgnCurrentY = prgnY; char * prgbCurrentFlag = (char *)prgfOnCurve; // converting bool to char should be safe int cCurrentPoints = cnPoints; bool fOffset = true, fTransOff = true; int a, b; float flt11, flt12, flt21, flt22; // int * prgnPrevX = prgnX; // in case first att pt number relative to preceding glyph // int * prgnPrevY = prgnY; for (size_t i = 0; i < cCompId; i++) { if (IsSpace(static_cast<gid16>(rgnCompId[i]), pLoca, lLocaSize, pHead)) {return false;} void * pCompGlyf = GlyfLookup(static_cast<gid16>(rgnCompId[i]), pGlyf, pLoca, lGlyfSize, lLocaSize, pHead); if (pCompGlyf == NULL) {return false;} // returns false on multi-level composite if (!GlyfPoints(pCompGlyf, prgnCurrentX, prgnCurrentY, prgbCurrentFlag, cCurrentPoints, cActualPts)) return false; if (!GetComponentPlacement(pSimpleGlyf, rgnCompId[i], fOffset, a, b)) return false; if (!GetComponentTransform(pSimpleGlyf, rgnCompId[i], flt11, flt12, flt21, flt22, fTransOff)) return false; bool fIdTrans = flt11 == 1.0 && flt12 == 0.0 && flt21 == 0.0 && flt22 == 1.0; // convert points to absolute coordinates // do before transform and attachment point placement are applied CalcAbsolutePoints(prgnCurrentX, prgnCurrentY, cActualPts); // apply transform - see main method note above // do before attachment point calcs if (!fIdTrans) for (int j = 0; j < cActualPts; j++) { int x = prgnCurrentX[j]; // store before transform applied int y = prgnCurrentY[j]; prgnCurrentX[j] = (int)(x * flt11 + y * flt12); prgnCurrentY[j] = (int)(x * flt21 + y * flt22); } // apply placement - see main method note above int nXOff, nYOff; if (fOffset) // explicit x & y offsets { /* ignore fTransOff for now if (fTransOff && !fIdTrans) { // transform x & y offsets nXOff = (int)(a * flt11 + b * flt12); nYOff = (int)(a * flt21 + b * flt22); } else */ { // don't transform offset nXOff = a; nYOff = b; } } else // attachment points { // in case first point is relative to preceding glyph and second relative to current // nXOff = prgnPrevX[a] - prgnCurrentX[b]; // nYOff = prgnPrevY[a] - prgnCurrentY[b]; // first point number relative to whole composite, second relative to current glyph nXOff = prgnX[a] - prgnCurrentX[b]; nYOff = prgnY[a] - prgnCurrentY[b]; } for (int j = 0; j < cActualPts; j++) { prgnCurrentX[j] += nXOff; prgnCurrentY[j] += nYOff; } // prgnPrevX = prgnCurrentX; // prgnPrevY = prgnCurrentY; prgnCurrentX += cActualPts; prgnCurrentY += cActualPts; prgbCurrentFlag += cActualPts; cCurrentPoints -= cActualPts; } SimplifyFlags((char *)prgfOnCurve, cnPoints); return true; } /*---------------------------------------------------------------------------------------------- Simplify the meaning of flags to just indicate whether point is on-curve or off-curve. ---------------------------------------------------------------------------------------------*/ bool SimplifyFlags(char * prgbFlags, int cnPoints) { for (int i = 0; i < cnPoints; i++) prgbFlags[i] = static_cast<char>(prgbFlags[i] & Sfnt::SimpleGlyph::OnCurve); return true; } /*---------------------------------------------------------------------------------------------- Convert relative point coordinates to absolute coordinates Points are stored in the font such that they are offsets from one another except for the first point of a glyph. ---------------------------------------------------------------------------------------------*/ bool CalcAbsolutePoints(int * prgnX, int * prgnY, int cnPoints) { int nX = prgnX[0]; int nY = prgnY[0]; for (int i = 1; i < cnPoints; i++) { prgnX[i] += nX; nX = prgnX[i]; prgnY[i] += nY; nY = prgnY[i]; } return true; } #endif /*---------------------------------------------------------------------------------------------- Return the length of the 'name' table in bytes. Currently used. ---------------------------------------------------------------------------------------------*/ #if 0 size_t NameTableLength(const byte * pTable) { byte * pb = (const_cast<byte *>(pTable)) + 2; // skip format size_t cRecords = *pb++ << 8; cRecords += *pb++; int dbStringOffset0 = (*pb++) << 8; dbStringOffset0 += *pb++; int dbMaxStringOffset = 0; for (size_t irec = 0; irec < cRecords; irec++) { int nPlatform = (*pb++) << 8; nPlatform += *pb++; int nEncoding = (*pb++) << 8; nEncoding += *pb++; int nLanguage = (*pb++) << 8; nLanguage += *pb++; int nName = (*pb++) << 8; nName += *pb++; int cbStringLen = (*pb++) << 8; cbStringLen += *pb++; int dbStringOffset = (*pb++) << 8; dbStringOffset += *pb++; if (dbMaxStringOffset < dbStringOffset + cbStringLen) dbMaxStringOffset = dbStringOffset + cbStringLen; } return dbStringOffset0 + dbMaxStringOffset; } #endif } // end of namespace TtfUtil } // end of namespace graphite
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