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deleted file mode 100644
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@@ -1,1980 +0,0 @@
-/* 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.
-*/
-/*--------------------------------------------------------------------*//*:Ignore this sentence.
-
-File: TtfUtil.cpp
-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.
--------------------------------------------------------------------------------*//*:End Ignore*/
-
-
-/***********************************************************************************************
- 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
-{
- // max number of components allowed in composite glyphs
- const int kMaxGlyphComponents = 8;
-
- template <int R, typename T>
- inline float fixed_to_float(const T f) {
- return float(f)/float(2^R);
- }
-
-/*----------------------------------------------------------------------------------------------
- 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)
-{
- lOffset = 0;
- lSize = offsetof(Sfnt::OffsetSubTable, table_directory);
- assert(sizeof(uint32) + 4*sizeof (uint16) == lSize);
- return true;
-}
-
-/*----------------------------------------------------------------------------------------------
- Check the offset table for expected data.
- Return true if success, false otherwise.
-----------------------------------------------------------------------------------------------*/
-bool CheckHeader(const void * pHdr)
-{
- const Sfnt::OffsetSubTable * pOffsetTable
- = reinterpret_cast<const Sfnt::OffsetSubTable *>(pHdr);
-
- return pHdr && be::swap(pOffsetTable->scaler_type) == Sfnt::OffsetSubTable::TrueTypeWin;
-}
-
-/*----------------------------------------------------------------------------------------------
- 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)
-{
- const Sfnt::OffsetSubTable * pOffsetTable
- = reinterpret_cast<const Sfnt::OffsetSubTable *>(pHdr);
-
- lOffset = offsetof(Sfnt::OffsetSubTable, table_directory);
- lSize = be::swap(pOffsetTable->num_tables)
- * sizeof(Sfnt::OffsetSubTable::Entry);
-
- return true;
-}
-
-
-/*----------------------------------------------------------------------------------------------
- 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)
-{
- const Sfnt::OffsetSubTable * pOffsetTable
- = reinterpret_cast<const Sfnt::OffsetSubTable *>(pHdr);
- const size_t num_tables = be::swap(pOffsetTable->num_tables);
- const Sfnt::OffsetSubTable::Entry
- * entry_itr = reinterpret_cast<const Sfnt::OffsetSubTable::Entry *>(
- pTableDir),
- * const dir_end = entry_itr + num_tables;
-
- if (num_tables > 40)
- return false;
-
- for (;entry_itr != dir_end; ++entry_itr) // 40 - safe guard
- {
- if (be::swap(entry_itr->tag) == TableTag)
- {
- lOffset = be::swap(entry_itr->offset);
- lSize = be::swap(entry_itr->length);
- return true;
- }
- }
-
- return false;
-}
-
-/*----------------------------------------------------------------------------------------------
- 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)
-{
- using namespace Sfnt;
-
- if (pTable == 0) return false;
-
- switch(TableId)
- {
- case Tag::cmap: // cmap
- {
- const Sfnt::CharacterCodeMap * const pCmap
- = reinterpret_cast<const Sfnt::CharacterCodeMap *>(pTable);
- return be::swap(pCmap->version) == 0;
- }
-
- case Tag::head: // head
- {
- const Sfnt::FontHeader * const pHead
- = reinterpret_cast<const Sfnt::FontHeader *>(pTable);
- bool r = be::swap(pHead->version) == OneFix
- && be::swap(pHead->magic_number) == FontHeader::MagicNumber
- && be::swap(pHead->glyph_data_format)
- == FontHeader::GlypDataFormat
- && (be::swap(pHead->index_to_loc_format)
- == FontHeader::ShortIndexLocFormat
- || be::swap(pHead->index_to_loc_format)
- == FontHeader::LongIndexLocFormat)
- && sizeof(FontHeader) <= lTableSize;
- return r;
- }
-
- case Tag::post: // post
- {
- const Sfnt::PostScriptGlyphName * const pPost
- = reinterpret_cast<const Sfnt::PostScriptGlyphName *>(pTable);
- const fixed format = be::swap(pPost->format);
- bool r = format == PostScriptGlyphName::Format1
- || format == PostScriptGlyphName::Format2
- || format == PostScriptGlyphName::Format3
- || format == PostScriptGlyphName::Format25;
- return r;
- }
-
- case Tag::hhea: // hhea
- {
- const Sfnt::HorizontalHeader * pHhea =
- reinterpret_cast<const Sfnt::HorizontalHeader *>(pTable);
- bool r = be::swap(pHhea->version) == OneFix
- && be::swap(pHhea->metric_data_format) == 0
- && sizeof (Sfnt::HorizontalHeader) <= lTableSize;
- return r;
- }
-
- case Tag::maxp: // maxp
- {
- const Sfnt::MaximumProfile * pMaxp =
- reinterpret_cast<const Sfnt::MaximumProfile *>(pTable);
- bool r = be::swap(pMaxp->version) == OneFix
- && sizeof(Sfnt::MaximumProfile) <= lTableSize;
- return r;
- }
-
- case Tag::OS_2: // OS/2
- {
- const Sfnt::Compatibility * pOs2
- = reinterpret_cast<const Sfnt::Compatibility *>(pTable);
- if (be::swap(pOs2->version) == 0)
- { // OS/2 table version 1 size
-// if (sizeof(Sfnt::Compatibility)
-// - sizeof(uint32)*2 - sizeof(int16)*2
-// - sizeof(uint16)*3 <= lTableSize)
- if (sizeof(Sfnt::Compatibility0) <= lTableSize)
- return true;
- }
- else if (be::swap(pOs2->version) == 1)
- { // OS/2 table version 2 size
-// if (sizeof(Sfnt::Compatibility)
-// - sizeof(int16) *2
-// - sizeof(uint16)*3 <= lTableSize)
- if (sizeof(Sfnt::Compatibility1) <= lTableSize)
- return true;
- }
- else if (be::swap(pOs2->version) == 2)
- { // OS/2 table version 3 size
- if (sizeof(Sfnt::Compatibility2) <= lTableSize)
- return true;
- }
- else if (be::swap(pOs2->version) == 3 || be::swap(pOs2->version) == 4)
- { // OS/2 table version 4 size - version 4 changed the meaning of some fields which we don't use
- if (sizeof(Sfnt::Compatibility3) <= lTableSize)
- return true;
- }
- else
- return false;
- break;
- }
-
- case Tag::name:
- {
- const Sfnt::FontNames * pName
- = reinterpret_cast<const Sfnt::FontNames *>(pTable);
- return be::swap(pName->format) == 0;
- }
-
- default:
- break;
- }
-
- return true;
-}
-
-/*----------------------------------------------------------------------------------------------
- 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)
-{
- const Sfnt::MaximumProfile * pTable =
- reinterpret_cast<const Sfnt::MaximumProfile *>(pMaxp);
- return be::swap(pTable->num_glyphs);
-}
-
-#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)
-{
- const Sfnt::FontHeader * pTable =
- reinterpret_cast<const Sfnt::FontHeader *>(pHead);
-
- return be::swap(pTable->units_per_em);
-}
-
-#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)
-{
- lOffset = 0;
- lSize = 0;
-
- const Sfnt::FontNames * pTable = reinterpret_cast<const Sfnt::FontNames *>(pName);
- uint16 cRecord = be::swap(pTable->count);
- uint16 nRecordOffset = be::swap(pTable->string_offset);
- 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 &&
- be::swap(pRecord->language_id) == nLangId &&
- be::swap(pRecord->name_id) == nNameId)
- {
- lOffset = be::swap(pRecord->offset) + nRecordOffset;
- lSize = be::swap(pRecord->length);
- return true;
- }
- pRecord++;
- }
-
- return false;
-}
-
-#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)
-{
- const Sfnt::HorizontalMetric * phmtx =
- reinterpret_cast<const Sfnt::HorizontalMetric *>(pHmtx);
-
- const Sfnt::HorizontalHeader * phhea =
- reinterpret_cast<const Sfnt::HorizontalHeader *>(pHhea);
-
- size_t cLongHorMetrics = be::swap(phhea->num_long_hor_metrics);
- if (nGlyphId < cLongHorMetrics)
- { // glyph id is acceptable
- if (nGlyphId * sizeof(Sfnt::HorizontalMetric) >= lHmtxSize) return false;
- nAdvWid = be::swap(phmtx[nGlyphId].advance_width);
- nLsb = be::swap(phmtx[nGlyphId].left_side_bearing);
- }
- else
- {
- // guard against bad glyph id
- size_t lLsbOffset = sizeof(Sfnt::HorizontalMetric) * cLongHorMetrics +
- sizeof(int16) * (nGlyphId - cLongHorMetrics); // offset in bytes
- // We test like this as LsbOffset is an offset not a length.
- if (lLsbOffset > lHmtxSize - sizeof(int16))
- {
- nLsb = 0;
- return false;
- }
- nAdvWid = be::swap(phmtx[cLongHorMetrics - 1].advance_width);
- nLsb = be::peek<int16>(reinterpret_cast<const byte *>(phmtx) + lLsbOffset);
- }
-
- return true;
-}
-
-/*----------------------------------------------------------------------------------------------
- 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)
-{
- const Sfnt::CharacterCodeMap * pTable = reinterpret_cast<const Sfnt::CharacterCodeMap *>(pCmap);
- uint16 csuPlatforms = be::swap(pTable->num_subtables);
- if (length && (sizeof(Sfnt::CharacterCodeMap) + 8 * (csuPlatforms - 1) > length))
- return NULL;
- for (int i = 0; i < csuPlatforms; i++)
- {
- if (be::swap(pTable->encoding[i].platform_id) == nPlatformId &&
- (nEncodingId == -1 || be::swap(pTable->encoding[i].platform_specific_id) == nEncodingId))
- {
- uint32 offset = be::swap(pTable->encoding[i].offset);
- const uint8 * pRtn = reinterpret_cast<const uint8 *>(pCmap) + offset;
- if (length)
- {
- if (offset > length) return NULL;
- uint16 format = be::read<uint16>(pRtn);
- if (format == 4)
- {
- uint16 subTableLength = be::peek<uint16>(pRtn);
- if (i + 1 == csuPlatforms)
- {
- if (subTableLength > length - offset)
- return NULL;
- }
- else if (subTableLength > be::swap(pTable->encoding[i+1].offset))
- return NULL;
- }
- if (format == 12)
- {
- uint32 subTableLength = be::peek<uint32>(pRtn);
- if (i + 1 == csuPlatforms)
- {
- if (subTableLength > length - offset)
- return NULL;
- }
- else if (subTableLength > be::swap(pTable->encoding[i+1].offset))
- return NULL;
- }
- }
- return reinterpret_cast<const uint8 *>(pCmap) + offset;
- }
- }
-
- return 0;
-}
-
-/*----------------------------------------------------------------------------------------------
- Check the Microsoft Unicode subtable for expected values
-----------------------------------------------------------------------------------------------*/
-bool CheckCmapSubtable4(const void * pCmapSubtable4)
-{
- if (!pCmapSubtable4) return false;
- const Sfnt::CmapSubTable * pTable = reinterpret_cast<const Sfnt::CmapSubTable *>(pCmapSubtable4);
- // Bob H says ome freeware TT fonts have version 1 (eg, CALIGULA.TTF)
- // so don't check subtable version. 21 Mar 2002 spec changes version to language.
- if (be::swap(pTable->format) != 4) return false;
- const Sfnt::CmapSubTableFormat4 * pTable4 = reinterpret_cast<const Sfnt::CmapSubTableFormat4 *>(pCmapSubtable4);
- uint16 length = be::swap(pTable4->length);
- if (length < sizeof(Sfnt::CmapSubTableFormat4))
- return false;
- uint16 nRanges = be::swap(pTable4->seg_count_x2) >> 1;
- if (length < sizeof(Sfnt::CmapSubTableFormat4) + 4 * nRanges * sizeof(uint16))
- return false;
- // check last range is properly terminated
- uint16 chEnd = be::peek<uint16>(pTable4->end_code + nRanges - 1);
- return (chEnd == 0xFFFF);
-}
-
-/*----------------------------------------------------------------------------------------------
- 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)
-{
- const Sfnt::CmapSubTableFormat4 * pTable = reinterpret_cast<const Sfnt::CmapSubTableFormat4 *>(pCmapSubtabel4);
-
- uint16 nSeg = be::swap(pTable->seg_count_x2) >> 1;
-
- uint16 n;
- const uint16 * pLeft, * pMid;
- uint16 cMid, chStart, chEnd;
-
- if (rangeKey)
- {
- pMid = &(pTable->end_code[rangeKey]);
- chEnd = be::peek<uint16>(pMid);
- n = rangeKey;
- }
- else
- {
- // Binary search of the endCode[] array
- pLeft = &(pTable->end_code[0]);
- n = nSeg;
- while (n > 0)
- {
- cMid = n >> 1; // Pick an element in the middle
- pMid = pLeft + cMid;
- chEnd = be::peek<uint16>(pMid);
- if (nUnicodeId <= chEnd)
- {
- if (cMid == 0 || nUnicodeId > be::peek<uint16>(pMid -1))
- break; // Must be this seg or none!
- n = cMid; // Continue on left side, omitting mid point
- }
- else
- {
- pLeft = pMid + 1; // Continue on right side, omitting mid point
- n -= (cMid + 1);
- }
- }
-
- if (!n)
- return 0;
- }
-
- // Ok, we're down to one segment and pMid points to the endCode element
- // Either this is it or none is.
-
- chStart = be::peek<uint16>(pMid += nSeg + 1);
- if (chEnd >= nUnicodeId && nUnicodeId >= chStart)
- {
- // Found correct segment. Find Glyph Id
- int16 idDelta = be::peek<uint16>(pMid += nSeg);
- uint16 idRangeOffset = be::peek<uint16>(pMid += nSeg);
-
- if (idRangeOffset == 0)
- return (uint16)(idDelta + nUnicodeId); // must use modulus 2^16
-
- // Look up value in glyphIdArray
- const ptrdiff_t offset = (nUnicodeId - chStart) + (idRangeOffset >> 1) +
- (pMid - reinterpret_cast<const uint16 *>(pTable));
- if (offset * 2 >= be::swap<uint16>(pTable->length))
- return 0;
- gid16 nGlyphId = be::peek<uint16>(reinterpret_cast<const uint16 *>(pTable)+offset);
- // If this value is 0, return 0. Else add the idDelta
- return nGlyphId ? nGlyphId + idDelta : 0;
- }
-
- return 0;
-}
-
-/*----------------------------------------------------------------------------------------------
- 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)
-{
- const Sfnt::CmapSubTableFormat4 * pTable = reinterpret_cast<const Sfnt::CmapSubTableFormat4 *>(pCmap31);
-
- uint16 nRange = be::swap(pTable->seg_count_x2) >> 1;
-
- uint32 nUnicodePrev = (uint32)nUnicodeId;
-
- const uint16 * pStartCode = &(pTable->end_code[0])
- + nRange // length of end code array
- + 1; // reserved word
-
- if (nUnicodePrev == 0)
- {
- // return the first codepoint.
- if (pRangeKey)
- *pRangeKey = 0;
- return be::peek<uint16>(pStartCode);
- }
- else if (nUnicodePrev >= 0xFFFF)
- {
- if (pRangeKey)
- *pRangeKey = nRange - 1;
- return 0xFFFF;
- }
-
- int iRange = (pRangeKey) ? *pRangeKey : 0;
- // Just in case we have a bad key:
- while (iRange > 0 && be::peek<uint16>(pStartCode + iRange) > nUnicodePrev)
- iRange--;
- while (be::peek<uint16>(pTable->end_code + iRange) < nUnicodePrev)
- iRange++;
-
- // Now iRange is the range containing nUnicodePrev.
- unsigned int nStartCode = be::peek<uint16>(pStartCode + iRange);
- unsigned int nEndCode = be::peek<uint16>(pTable->end_code + iRange);
-
- if (nStartCode > nUnicodePrev)
- // Oops, nUnicodePrev is not in the cmap! Adjust so we get a reasonable
- // answer this time around.
- nUnicodePrev = nStartCode - 1;
-
- if (nEndCode > nUnicodePrev)
- {
- // Next is in the same range; it is the next successive codepoint.
- if (pRangeKey)
- *pRangeKey = iRange;
- return nUnicodePrev + 1;
- }
-
- // Otherwise the next codepoint is the first one in the next range.
- // There is guaranteed to be a next range because there must be one that
- // ends with 0xFFFF.
- if (pRangeKey)
- *pRangeKey = iRange + 1;
- return be::peek<uint16>(pStartCode + iRange + 1);
-}
-
-/*----------------------------------------------------------------------------------------------
- Check the Microsoft UCS-4 subtable for expected values.
-----------------------------------------------------------------------------------------------*/
-bool CheckCmapSubtable12(const void *pCmapSubtable12)
-{
- if (!pCmapSubtable12) return false;
- const Sfnt::CmapSubTable * pTable = reinterpret_cast<const Sfnt::CmapSubTable *>(pCmapSubtable12);
- if (be::swap(pTable->format) != 12)
- return false;
- const Sfnt::CmapSubTableFormat12 * pTable12 = reinterpret_cast<const Sfnt::CmapSubTableFormat12 *>(pCmapSubtable12);
- uint32 length = be::swap(pTable12->length);
- if (length < sizeof(Sfnt::CmapSubTableFormat12))
- return false;
-
- return (length == (sizeof(Sfnt::CmapSubTableFormat12) + (be::swap(pTable12->num_groups) - 1)
- * sizeof(uint32) * 3));
-}
-
-/*----------------------------------------------------------------------------------------------
- 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)
-{
- const Sfnt::CmapSubTableFormat12 * pTable = reinterpret_cast<const Sfnt::CmapSubTableFormat12 *>(pCmap310);
-
- //uint32 uLength = be::swap(pTable->length); //could use to test for premature end of table
- uint32 ucGroups = be::swap(pTable->num_groups);
-
- for (unsigned int i = rangeKey; i < ucGroups; i++)
- {
- uint32 uStartCode = be::swap(pTable->group[i].start_char_code);
- uint32 uEndCode = be::swap(pTable->group[i].end_char_code);
- if (uUnicodeId >= uStartCode && uUnicodeId <= uEndCode)
- {
- uint32 uDiff = uUnicodeId - uStartCode;
- uint32 uStartGid = be::swap(pTable->group[i].start_glyph_id);
- return static_cast<gid16>(uStartGid + uDiff);
- }
- }
-
- return 0;
-}
-
-/*----------------------------------------------------------------------------------------------
- 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)
-{
- const Sfnt::CmapSubTableFormat12 * pTable = reinterpret_cast<const Sfnt::CmapSubTableFormat12 *>(pCmap310);
-
- int nRange = be::swap(pTable->num_groups);
-
- uint32 nUnicodePrev = (uint32)nUnicodeId;
-
- if (nUnicodePrev == 0)
- {
- // return the first codepoint.
- if (pRangeKey)
- *pRangeKey = 0;
- return be::swap(pTable->group[0].start_char_code);
- }
- else if (nUnicodePrev >= 0x10FFFF)
- {
- if (pRangeKey)
- *pRangeKey = nRange;
- return 0x10FFFF;
- }
-
- int iRange = (pRangeKey) ? *pRangeKey : 0;
- // Just in case we have a bad key:
- while (iRange > 0 && be::swap(pTable->group[iRange].start_char_code) > nUnicodePrev)
- iRange--;
- while (be::swap(pTable->group[iRange].end_char_code) < nUnicodePrev)
- iRange++;
-
- // Now iRange is the range containing nUnicodePrev.
-
- unsigned int nStartCode = be::swap(pTable->group[iRange].start_char_code);
- unsigned int nEndCode = be::swap(pTable->group[iRange].end_char_code);
-
- if (nStartCode > nUnicodePrev)
- // Oops, nUnicodePrev is not in the cmap! Adjust so we get a reasonable
- // answer this time around.
- nUnicodePrev = nStartCode - 1;
-
- if (nEndCode > nUnicodePrev)
- {
- // Next is in the same range; it is the next successive codepoint.
- if (pRangeKey)
- *pRangeKey = iRange;
- return nUnicodePrev + 1;
- }
-
- // Otherwise the next codepoint is the first one in the next range, or 10FFFF if we're done.
- if (pRangeKey)
- *pRangeKey = iRange + 1;
- return (iRange + 1 >= nRange) ? 0x10FFFF : be::swap(pTable->group[iRange + 1].start_char_code);
-}
-
-/*----------------------------------------------------------------------------------------------
- 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)
-{
- const Sfnt::FontHeader * pTable = reinterpret_cast<const Sfnt::FontHeader *>(pHead);
-
- // CheckTable verifies the index_to_loc_format is valid
- if (be::swap(pTable->index_to_loc_format) == Sfnt::FontHeader::ShortIndexLocFormat)
- { // loca entries are two bytes and have been divided by two
- if (nGlyphId < (lLocaSize >> 1) - 1) // allow sentinel value to be accessed
- {
- const uint16 * pShortTable = reinterpret_cast<const uint16 *>(pLoca);
- return (be::peek<uint16>(pShortTable + nGlyphId) << 1);
- }
- }
-
- if (be::swap(pTable->index_to_loc_format) == Sfnt::FontHeader::LongIndexLocFormat)
- { // loca entries are four bytes
- if (nGlyphId < (lLocaSize >> 2) - 1)
- {
- const uint32 * pLongTable = reinterpret_cast<const uint32 *>(pLoca);
- return be::peek<uint32>(pLongTable + nGlyphId);
- }
- }
-
- // only get here if glyph id was bad
- return -1;
- //throw std::out_of_range("glyph id out of range for font");
-}
-
-/*----------------------------------------------------------------------------------------------
- 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)
-{
- const uint8 * pByte = reinterpret_cast<const uint8 *>(pGlyf);
- if (nGlyfOffset == size_t(-1) || nGlyfOffset >= nTableLen)
- return NULL;
- return const_cast<uint8 *>(pByte + nGlyfOffset);
-}
-
-/*----------------------------------------------------------------------------------------------
- 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)
-{
- const Sfnt::Glyph * pGlyph = reinterpret_cast<const Sfnt::Glyph *>(pSimpleGlyf);
-
- xMin = be::swap(pGlyph->x_min);
- yMin = be::swap(pGlyph->y_min);
- xMax = be::swap(pGlyph->x_max);
- yMax = be::swap(pGlyph->y_max);
-
- return true;
-}
-
-#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)
-{
- // test for valid glyph id
- // CheckTable verifies the index_to_loc_format is valid
-
- 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)
- if (nGlyphId >= (lLocaSize >> 1) - 1) // don't allow nGlyphId to access sentinel
- {
-// throw std::out_of_range("glyph id out of range for font");
- return NULL;
- }
- }
- if (be::swap(pTable->index_to_loc_format) == Sfnt::FontHeader::LongIndexLocFormat)
- { // loca entries are four bytes
- if (nGlyphId >= (lLocaSize >> 2) - 1)
- {
-// throw std::out_of_range("glyph id out of range for font");
- return NULL;
- }
- }
-
- long lGlyfOffset = LocaLookup(nGlyphId, pLoca, lLocaSize, pHead);
- void * pSimpleGlyf = GlyfLookup(pGlyf, lGlyfOffset, lGlyfSize); // invalid loca offset returns null
- return pSimpleGlyf;
-}
-
-#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
- // TODO: doesn't support composite glyphs whose components are themselves components
- 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