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<?php
/*******************************************************************************
* TTFontFile class *
* *
* This class is based on The ReportLab Open Source PDF library *
* written in Python - http://www.reportlab.com/software/opensource/ *
* together with ideas from the OpenOffice source code and others. *
* *
* Version: 1.04 *
* Date: 2011-09-18 *
* Author: Ian Back <ianb@bpm1.com> *
* License: LGPL *
* Copyright (c) Ian Back, 2010 *
* This header must be retained in any redistribution or *
* modification of the file. *
* *
*******************************************************************************/
// Define the value used in the "head" table of a created TTF file
// 0x74727565 "true" for Mac
// 0x00010000 for Windows
// Either seems to work for a font embedded in a PDF file
// when read by Adobe Reader on a Windows PC(!)
define("_TTF_MAC_HEADER", false);
// TrueType Font Glyph operators
define("GF_WORDS",(1 << 0));
define("GF_SCALE",(1 << 3));
define("GF_MORE",(1 << 5));
define("GF_XYSCALE",(1 << 6));
define("GF_TWOBYTWO",(1 << 7));
class TTFontFile {
var $maxUni;
var $_pos;
var $numTables;
var $searchRange;
var $entrySelector;
var $rangeShift;
var $tables;
var $otables;
var $filename;
var $fh;
var $hmetrics;
var $glyphPos;
var $charToGlyph;
var $ascent;
var $descent;
var $name;
var $familyName;
var $styleName;
var $fullName;
var $uniqueFontID;
var $unitsPerEm;
var $bbox;
var $capHeight;
var $stemV;
var $italicAngle;
var $flags;
var $underlinePosition;
var $underlineThickness;
var $charWidths;
var $defaultWidth;
var $maxStrLenRead;
function TTFontFile() {
$this->maxStrLenRead = 200000; // Maximum size of glyf table to read in as string (otherwise reads each glyph from file)
}
function getMetrics($file) {
$this->filename = $file;
$this->fh = fopen($file,'rb') or die('Can\'t open file ' . $file);
$this->_pos = 0;
$this->charWidths = '';
$this->glyphPos = array();
$this->charToGlyph = array();
$this->tables = array();
$this->otables = array();
$this->ascent = 0;
$this->descent = 0;
$this->TTCFonts = array();
$this->version = $version = $this->read_ulong();
if ($version==0x4F54544F)
die("Postscript outlines are not supported");
if ($version==0x74746366)
die("ERROR - TrueType Fonts Collections not supported");
if (!in_array($version, array(0x00010000,0x74727565)))
die("Not a TrueType font: version=".$version);
$this->readTableDirectory();
$this->extractInfo();
fclose($this->fh);
}
function readTableDirectory() {
$this->numTables = $this->read_ushort();
$this->searchRange = $this->read_ushort();
$this->entrySelector = $this->read_ushort();
$this->rangeShift = $this->read_ushort();
$this->tables = array();
for ($i=0;$i<$this->numTables;$i++) {
$record = array();
$record['tag'] = $this->read_tag();
$record['checksum'] = array($this->read_ushort(),$this->read_ushort());
$record['offset'] = $this->read_ulong();
$record['length'] = $this->read_ulong();
$this->tables[$record['tag']] = $record;
}
}
function sub32($x, $y) {
$xlo = $x[1];
$xhi = $x[0];
$ylo = $y[1];
$yhi = $y[0];
if ($ylo > $xlo) { $xlo += 1 << 16; $yhi += 1; }
$reslo = $xlo-$ylo;
if ($yhi > $xhi) { $xhi += 1 << 16; }
$reshi = $xhi-$yhi;
$reshi = $reshi & 0xFFFF;
return array($reshi, $reslo);
}
function calcChecksum($data) {
if (mb_strlen($data,'8bit') % 4) { $data .= str_repeat("\0",(4-(mb_strlen($data,'8bit') % 4))); }
$hi=0x0000;
$lo=0x0000;
for($i=0;$i<mb_strlen($data,'8bit');$i+=4) {
$hi += (ord($data[$i])<<8) + ord($data[$i+1]);
$lo += (ord($data[$i+2])<<8) + ord($data[$i+3]);
$hi += $lo >> 16;
$lo = $lo & 0xFFFF;
$hi = $hi & 0xFFFF;
}
return array($hi, $lo);
}
function get_table_pos($tag) {
$offset = $this->tables[$tag]['offset'];
$length = $this->tables[$tag]['length'];
return array($offset, $length);
}
function seek($pos) {
$this->_pos = $pos;
fseek($this->fh,$this->_pos);
}
function skip($delta) {
$this->_pos = $this->_pos + $delta;
fseek($this->fh,$this->_pos);
}
function seek_table($tag, $offset_in_table = 0) {
$tpos = $this->get_table_pos($tag);
$this->_pos = $tpos[0] + $offset_in_table;
fseek($this->fh, $this->_pos);
return $this->_pos;
}
function read_tag() {
$this->_pos += 4;
return fread($this->fh,4);
}
function read_short() {
$this->_pos += 2;
$s = fread($this->fh,2);
$a = (ord($s[0])<<8) + ord($s[1]);
if ($a & (1 << 15) ) { $a = ($a - (1 << 16)) ; }
return $a;
}
function unpack_short($s) {
$a = (ord($s[0])<<8) + ord($s[1]);
if ($a & (1 << 15) ) {
$a = ($a - (1 << 16));
}
return $a;
}
function read_ushort() {
$this->_pos += 2;
$s = fread($this->fh,2);
return (ord($s[0])<<8) + ord($s[1]);
}
function read_ulong() {
$this->_pos += 4;
$s = fread($this->fh,4);
// if large uInt32 as an integer, PHP converts it to -ve
return (ord($s[0])*16777216) + (ord($s[1])<<16) + (ord($s[2])<<8) + ord($s[3]); // 16777216 = 1<<24
}
function get_ushort($pos) {
fseek($this->fh,$pos);
$s = fread($this->fh,2);
return (ord($s[0])<<8) + ord($s[1]);
}
function get_ulong($pos) {
fseek($this->fh,$pos);
$s = fread($this->fh,4);
// iF large uInt32 as an integer, PHP converts it to -ve
return (ord($s[0])*16777216) + (ord($s[1])<<16) + (ord($s[2])<<8) + ord($s[3]); // 16777216 = 1<<24
}
function pack_short($val) {
if ($val<0) {
$val = abs($val);
$val = ~$val;
$val += 1;
}
return pack("n",$val);
}
function splice($stream, $offset, $value) {
return mb_substr($stream,0,$offset,'8bit') . $value . mb_substr($stream,$offset+mb_strlen($value,'8bit'),mb_strlen($stream,'8bit'),'8bit');
}
function _set_ushort($stream, $offset, $value) {
$up = pack("n", $value);
return $this->splice($stream, $offset, $up);
}
function _set_short($stream, $offset, $val) {
if ($val<0) {
$val = abs($val);
$val = ~$val;
$val += 1;
}
$up = pack("n",$val);
return $this->splice($stream, $offset, $up);
}
function get_chunk($pos, $length) {
fseek($this->fh,$pos);
if ($length <1) { return ''; }
return (fread($this->fh,$length));
}
function get_table($tag) {
list($pos, $length) = $this->get_table_pos($tag);
if ($length == 0) { die('Truetype font ('.$this->filename.'): error reading table: '.$tag); }
fseek($this->fh,$pos);
return (fread($this->fh,$length));
}
function add($tag, $data) {
if ($tag == 'head') {
$data = $this->splice($data, 8, "\0\0\0\0");
}
$this->otables[$tag] = $data;
}
/////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////
function extractInfo() {
///////////////////////////////////
// name - Naming table
///////////////////////////////////
$this->sFamilyClass = 0;
$this->sFamilySubClass = 0;
$name_offset = $this->seek_table("name");
$format = $this->read_ushort();
if ($format != 0)
die("Unknown name table format ".$format);
$numRecords = $this->read_ushort();
$string_data_offset = $name_offset + $this->read_ushort();
$names = array(1=>'',2=>'',3=>'',4=>'',6=>'');
$K = array_keys($names);
$nameCount = count($names);
for ($i=0;$i<$numRecords; $i++) {
$platformId = $this->read_ushort();
$encodingId = $this->read_ushort();
$languageId = $this->read_ushort();
$nameId = $this->read_ushort();
$length = $this->read_ushort();
$offset = $this->read_ushort();
if (!in_array($nameId,$K)) continue;
$N = '';
if ($platformId == 3 && $encodingId == 1 && $languageId == 0x409) { // Microsoft, Unicode, US English, PS Name
$opos = $this->_pos;
$this->seek($string_data_offset + $offset);
if ($length % 2 != 0)
die("PostScript name is UTF-16BE string of odd length");
$length /= 2;
$N = '';
while ($length > 0) {
$char = $this->read_ushort();
$N .= (chr($char));
$length -= 1;
}
$this->_pos = $opos;
$this->seek($opos);
}
else if ($platformId == 1 && $encodingId == 0 && $languageId == 0) { // Macintosh, Roman, English, PS Name
$opos = $this->_pos;
$N = $this->get_chunk($string_data_offset + $offset, $length);
$this->_pos = $opos;
$this->seek($opos);
}
if ($N && $names[$nameId]=='') {
$names[$nameId] = $N;
$nameCount -= 1;
if ($nameCount==0) break;
}
}
if ($names[6])
$psName = $names[6];
else if ($names[4])
$psName = preg_replace('/ /','-',$names[4]);
else if ($names[1])
$psName = preg_replace('/ /','-',$names[1]);
else
$psName = '';
if (!$psName)
die("Could not find PostScript font name");
$this->name = $psName;
if ($names[1]) { $this->familyName = $names[1]; } else { $this->familyName = $psName; }
if ($names[2]) { $this->styleName = $names[2]; } else { $this->styleName = 'Regular'; }
if ($names[4]) { $this->fullName = $names[4]; } else { $this->fullName = $psName; }
if ($names[3]) { $this->uniqueFontID = $names[3]; } else { $this->uniqueFontID = $psName; }
if ($names[6]) { $this->fullName = $names[6]; }
///////////////////////////////////
// head - Font header table
///////////////////////////////////
$this->seek_table("head");
$this->skip(18);
$this->unitsPerEm = $unitsPerEm = $this->read_ushort();
$scale = 1000 / $unitsPerEm;
$this->skip(16);
$xMin = $this->read_short();
$yMin = $this->read_short();
$xMax = $this->read_short();
$yMax = $this->read_short();
$this->bbox = array(($xMin*$scale), ($yMin*$scale), ($xMax*$scale), ($yMax*$scale));
$this->skip(3*2);
$indexToLocFormat = $this->read_ushort();
$glyphDataFormat = $this->read_ushort();
if ($glyphDataFormat != 0)
die('Unknown glyph data format '.$glyphDataFormat);
///////////////////////////////////
// hhea metrics table
///////////////////////////////////
// ttf2t1 seems to use this value rather than the one in OS/2 - so put in for compatibility
if (isset($this->tables["hhea"])) {
$this->seek_table("hhea");
$this->skip(4);
$hheaAscender = $this->read_short();
$hheaDescender = $this->read_short();
$this->ascent = ($hheaAscender *$scale);
$this->descent = ($hheaDescender *$scale);
}
///////////////////////////////////
// OS/2 - OS/2 and Windows metrics table
///////////////////////////////////
if (isset($this->tables["OS/2"])) {
$this->seek_table("OS/2");
$version = $this->read_ushort();
$this->skip(2);
$usWeightClass = $this->read_ushort();
$this->skip(2);
$fsType = $this->read_ushort();
if ($fsType == 0x0002 || ($fsType & 0x0300) != 0) {
die('ERROR - Font file '.$this->filename.' cannot be embedded due to copyright restrictions.');
$this->restrictedUse = true;
}
$this->skip(20);
$sF = $this->read_short();
$this->sFamilyClass = ($sF >> 8);
$this->sFamilySubClass = ($sF & 0xFF);
$this->_pos += 10; //PANOSE = 10 byte length
$panose = fread($this->fh,10);
$this->skip(26);
$sTypoAscender = $this->read_short();
$sTypoDescender = $this->read_short();
if (!$this->ascent) $this->ascent = ($sTypoAscender*$scale);
if (!$this->descent) $this->descent = ($sTypoDescender*$scale);
if ($version > 1) {
$this->skip(16);
$sCapHeight = $this->read_short();
$this->capHeight = ($sCapHeight*$scale);
}
else {
$this->capHeight = $this->ascent;
}
}
else {
$usWeightClass = 500;
if (!$this->ascent) $this->ascent = ($yMax*$scale);
if (!$this->descent) $this->descent = ($yMin*$scale);
$this->capHeight = $this->ascent;
}
$this->stemV = 50 + intval(pow(($usWeightClass / 65.0),2));
///////////////////////////////////
// post - PostScript table
///////////////////////////////////
$this->seek_table("post");
$this->skip(4);
$this->italicAngle = $this->read_short() + $this->read_ushort() / 65536.0;
$this->underlinePosition = $this->read_short() * $scale;
$this->underlineThickness = $this->read_short() * $scale;
$isFixedPitch = $this->read_ulong();
$this->flags = 4;
if ($this->italicAngle!= 0)
$this->flags = $this->flags | 64;
if ($usWeightClass >= 600)
$this->flags = $this->flags | 262144;
if ($isFixedPitch)
$this->flags = $this->flags | 1;
///////////////////////////////////
// hhea - Horizontal header table
///////////////////////////////////
$this->seek_table("hhea");
$this->skip(32);
$metricDataFormat = $this->read_ushort();
if ($metricDataFormat != 0)
die('Unknown horizontal metric data format '.$metricDataFormat);
$numberOfHMetrics = $this->read_ushort();
if ($numberOfHMetrics == 0)
die('Number of horizontal metrics is 0');
///////////////////////////////////
// maxp - Maximum profile table
///////////////////////////////////
$this->seek_table("maxp");
$this->skip(4);
$numGlyphs = $this->read_ushort();
///////////////////////////////////
// cmap - Character to glyph index mapping table
///////////////////////////////////
$cmap_offset = $this->seek_table("cmap");
$this->skip(2);
$cmapTableCount = $this->read_ushort();
$unicode_cmap_offset = 0;
for ($i=0;$i<$cmapTableCount;$i++) {
$platformID = $this->read_ushort();
$encodingID = $this->read_ushort();
$offset = $this->read_ulong();
$save_pos = $this->_pos;
if (($platformID == 3 && $encodingID == 1) || $platformID == 0) { // Microsoft, Unicode
$format = $this->get_ushort($cmap_offset + $offset);
if ($format == 4) {
if (!$unicode_cmap_offset) $unicode_cmap_offset = $cmap_offset + $offset;
break;
}
}
$this->seek($save_pos );
}
if (!$unicode_cmap_offset)
die('Font ('.$this->filename .') does not have cmap for Unicode (platform 3, encoding 1, format 4, or platform 0, any encoding, format 4)');
$glyphToChar = array();
$charToGlyph = array();
$this->getCMAP4($unicode_cmap_offset, $glyphToChar, $charToGlyph );
///////////////////////////////////
// hmtx - Horizontal metrics table
///////////////////////////////////
$this->getHMTX($numberOfHMetrics, $numGlyphs, $glyphToChar, $scale);
}
/////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////
function makeSubset($file, &$subset) {
$this->filename = $file;
$this->fh = fopen($file ,'rb') or die('Can\'t open file ' . $file);
$this->_pos = 0;
$this->charWidths = '';
$this->glyphPos = array();
$this->charToGlyph = array();
$this->tables = array();
$this->otables = array();
$this->ascent = 0;
$this->descent = 0;
$this->skip(4);
$this->maxUni = 0;
$this->readTableDirectory();
///////////////////////////////////
// head - Font header table
///////////////////////////////////
$this->seek_table("head");
$this->skip(50);
$indexToLocFormat = $this->read_ushort();
$glyphDataFormat = $this->read_ushort();
///////////////////////////////////
// hhea - Horizontal header table
///////////////////////////////////
$this->seek_table("hhea");
$this->skip(32);
$metricDataFormat = $this->read_ushort();
$orignHmetrics = $numberOfHMetrics = $this->read_ushort();
///////////////////////////////////
// maxp - Maximum profile table
///////////////////////////////////
$this->seek_table("maxp");
$this->skip(4);
$numGlyphs = $this->read_ushort();
///////////////////////////////////
// cmap - Character to glyph index mapping table
///////////////////////////////////
$cmap_offset = $this->seek_table("cmap");
$this->skip(2);
$cmapTableCount = $this->read_ushort();
$unicode_cmap_offset = 0;
for ($i=0;$i<$cmapTableCount;$i++) {
$platformID = $this->read_ushort();
$encodingID = $this->read_ushort();
$offset = $this->read_ulong();
$save_pos = $this->_pos;
if (($platformID == 3 && $encodingID == 1) || $platformID == 0) { // Microsoft, Unicode
$format = $this->get_ushort($cmap_offset + $offset);
if ($format == 4) {
$unicode_cmap_offset = $cmap_offset + $offset;
break;
}
}
$this->seek($save_pos );
}
if (!$unicode_cmap_offset)
die('Font ('.$this->filename .') does not have cmap for Unicode (platform 3, encoding 1, format 4, or platform 0, any encoding, format 4)');
$glyphToChar = array();
$charToGlyph = array();
$this->getCMAP4($unicode_cmap_offset, $glyphToChar, $charToGlyph );
$this->charToGlyph = $charToGlyph;
///////////////////////////////////
// hmtx - Horizontal metrics table
///////////////////////////////////
$scale = 1; // not used
$this->getHMTX($numberOfHMetrics, $numGlyphs, $glyphToChar, $scale);
///////////////////////////////////
// loca - Index to location
///////////////////////////////////
$this->getLOCA($indexToLocFormat, $numGlyphs);
$subsetglyphs = array(0=>0);
$subsetCharToGlyph = array();
foreach($subset AS $code) {
if (isset($this->charToGlyph[$code])) {
$subsetglyphs[$this->charToGlyph[$code]] = $code; // Old Glyph ID => Unicode
$subsetCharToGlyph[$code] = $this->charToGlyph[$code]; // Unicode to old GlyphID
}
$this->maxUni = max($this->maxUni, $code);
}
list($start,$dummy) = $this->get_table_pos('glyf');
$glyphSet = array();
ksort($subsetglyphs);
$n = 0;
$fsLastCharIndex = 0; // maximum Unicode index (character code) in this font, according to the cmap subtable for platform ID 3 and platform- specific encoding ID 0 or 1.
foreach($subsetglyphs AS $originalGlyphIdx => $uni) {
$fsLastCharIndex = max($fsLastCharIndex , $uni);
$glyphSet[$originalGlyphIdx] = $n; // old glyphID to new glyphID
$n++;
}
ksort($subsetCharToGlyph);
foreach($subsetCharToGlyph AS $uni => $originalGlyphIdx) {
$codeToGlyph[$uni] = $glyphSet[$originalGlyphIdx] ;
}
$this->codeToGlyph = $codeToGlyph;
ksort($subsetglyphs);
foreach($subsetglyphs AS $originalGlyphIdx => $uni) {
$this->getGlyphs($originalGlyphIdx, $start, $glyphSet, $subsetglyphs);
}
$numGlyphs = $numberOfHMetrics = count($subsetglyphs );
//tables copied from the original
$tags = array ('name');
foreach($tags AS $tag) { $this->add($tag, $this->get_table($tag)); }
$tags = array ('cvt ', 'fpgm', 'prep', 'gasp');
foreach($tags AS $tag) {
if (isset($this->tables[$tag])) { $this->add($tag, $this->get_table($tag)); }
}
// post - PostScript
$opost = $this->get_table('post');
$post = "\x00\x03\x00\x00" . mb_substr($opost,4,12,'8bit') . "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
$this->add('post', $post);
// Sort CID2GID map into segments of contiguous codes
ksort($codeToGlyph);
unset($codeToGlyph[0]);
//unset($codeToGlyph[65535]);
$rangeid = 0;
$range = array();
$prevcid = -2;
$prevglidx = -1;
// for each character
foreach ($codeToGlyph as $cid => $glidx) {
if ($cid == ($prevcid + 1) && $glidx == ($prevglidx + 1)) {
$range[$rangeid][] = $glidx;
} else {
// new range
$rangeid = $cid;
$range[$rangeid] = array();
$range[$rangeid][] = $glidx;
}
$prevcid = $cid;
$prevglidx = $glidx;
}
// cmap - Character to glyph mapping - Format 4 (MS / )
$segCount = count($range) + 1; // + 1 Last segment has missing character 0xFFFF
$searchRange = 1;
$entrySelector = 0;
while ($searchRange * 2 <= $segCount ) {
$searchRange = $searchRange * 2;
$entrySelector = $entrySelector + 1;
}
$searchRange = $searchRange * 2;
$rangeShift = $segCount * 2 - $searchRange;
$length = 16 + (8*$segCount ) + ($numGlyphs+1);
$cmap = array(0, 1, // Index : version, number of encoding subtables
3, 1, // Encoding Subtable : platform (MS=3), encoding (Unicode)
0, 12, // Encoding Subtable : offset (hi,lo)
4, $length, 0, // Format 4 Mapping subtable: format, length, language
$segCount*2,
$searchRange,
$entrySelector,
$rangeShift);
// endCode(s)
foreach($range AS $start=>$subrange) {
$endCode = $start + (count($subrange)-1);
$cmap[] = $endCode; // endCode(s)
}
$cmap[] = 0xFFFF; // endCode of last Segment
$cmap[] = 0; // reservedPad
// startCode(s)
foreach($range AS $start=>$subrange) {
$cmap[] = $start; // startCode(s)
}
$cmap[] = 0xFFFF; // startCode of last Segment
// idDelta(s)
foreach($range AS $start=>$subrange) {
$idDelta = -($start-$subrange[0]);
$n += count($subrange);
$cmap[] = $idDelta; // idDelta(s)
}
$cmap[] = 1; // idDelta of last Segment
// idRangeOffset(s)
foreach($range AS $subrange) {
$cmap[] = 0; // idRangeOffset[segCount] Offset in bytes to glyph indexArray, or 0
}
$cmap[] = 0; // idRangeOffset of last Segment
foreach($range AS $subrange) {
foreach($subrange AS $glidx) {
$cmap[] = $glidx;
}
}
$cmap[] = 0; // Mapping for last character
$cmapstr = '';
foreach($cmap AS $cm) { $cmapstr .= pack("n",$cm); }
$this->add('cmap', $cmapstr);
// glyf - Glyph data
list($glyfOffset,$glyfLength) = $this->get_table_pos('glyf');
if ($glyfLength < $this->maxStrLenRead) {
$glyphData = $this->get_table('glyf');
}
$offsets = array();
$glyf = '';
$pos = 0;
$hmtxstr = '';
$xMinT = 0;
$yMinT = 0;
$xMaxT = 0;
$yMaxT = 0;
$advanceWidthMax = 0;
$minLeftSideBearing = 0;
$minRightSideBearing = 0;
$xMaxExtent = 0;
$maxPoints = 0; // points in non-compound glyph
$maxContours = 0; // contours in non-compound glyph
$maxComponentPoints = 0; // points in compound glyph
$maxComponentContours = 0; // contours in compound glyph
$maxComponentElements = 0; // number of glyphs referenced at top level
$maxComponentDepth = 0; // levels of recursion, set to 0 if font has only simple glyphs
$this->glyphdata = array();
foreach($subsetglyphs AS $originalGlyphIdx => $uni) {
// hmtx - Horizontal Metrics
$hm = $this->getHMetric($orignHmetrics, $originalGlyphIdx);
$hmtxstr .= $hm;
$offsets[] = $pos;
$glyphPos = $this->glyphPos[$originalGlyphIdx];
$glyphLen = $this->glyphPos[$originalGlyphIdx + 1] - $glyphPos;
if ($glyfLength < $this->maxStrLenRead) {
$data = mb_substr($glyphData,$glyphPos,$glyphLen,'8bit');
}
else {
if ($glyphLen > 0) $data = $this->get_chunk($glyfOffset+$glyphPos,$glyphLen);
else $data = '';
}
if ($glyphLen > 0) {
$up = unpack("n", mb_substr($data,0,2,'8bit'));
}
if ($glyphLen > 2 && ($up[1] & (1 << 15)) ) { // If number of contours <= -1 i.e. composiste glyph
$pos_in_glyph = 10;
$flags = GF_MORE;
$nComponentElements = 0;
while ($flags & GF_MORE) {
$nComponentElements += 1; // number of glyphs referenced at top level
$up = unpack("n", mb_substr($data,$pos_in_glyph,2,'8bit'));
$flags = $up[1];
$up = unpack("n", mb_substr($data,$pos_in_glyph+2,2,'8bit'));
$glyphIdx = $up[1];
$this->glyphdata[$originalGlyphIdx]['compGlyphs'][] = $glyphIdx;
$data = $this->_set_ushort($data, $pos_in_glyph + 2, $glyphSet[$glyphIdx]);
$pos_in_glyph += 4;
if ($flags & GF_WORDS) { $pos_in_glyph += 4; }
else { $pos_in_glyph += 2; }
if ($flags & GF_SCALE) { $pos_in_glyph += 2; }
else if ($flags & GF_XYSCALE) { $pos_in_glyph += 4; }
else if ($flags & GF_TWOBYTWO) { $pos_in_glyph += 8; }
}
$maxComponentElements = max($maxComponentElements, $nComponentElements);
}
$glyf .= $data;
$pos += $glyphLen;
if ($pos % 4 != 0) {
$padding = 4 - ($pos % 4);
$glyf .= str_repeat("\0",$padding);
$pos += $padding;
}
}
$offsets[] = $pos;
$this->add('glyf', $glyf);
// hmtx - Horizontal Metrics
$this->add('hmtx', $hmtxstr);
// loca - Index to location
$locastr = '';
if ((($pos + 1) >> 1) > 0xFFFF) {
$indexToLocFormat = 1; // long format
foreach($offsets AS $offset) { $locastr .= pack("N",$offset); }
}
else {
$indexToLocFormat = 0; // short format
foreach($offsets AS $offset) { $locastr .= pack("n",($offset/2)); }
}
$this->add('loca', $locastr);
// head - Font header
$head = $this->get_table('head');
$head = $this->_set_ushort($head, 50, $indexToLocFormat);
$this->add('head', $head);
// hhea - Horizontal Header
$hhea = $this->get_table('hhea');
$hhea = $this->_set_ushort($hhea, 34, $numberOfHMetrics);
$this->add('hhea', $hhea);
// maxp - Maximum Profile
$maxp = $this->get_table('maxp');
$maxp = $this->_set_ushort($maxp, 4, $numGlyphs);
$this->add('maxp', $maxp);
// OS/2 - OS/2
$os2 = $this->get_table('OS/2');
$this->add('OS/2', $os2 );
fclose($this->fh);
// Put the TTF file together
$stm = '';
$this->endTTFile($stm);
return $stm ;
}
//////////////////////////////////////////////////////////////////////////////////
// Recursively get composite glyph data
function getGlyphData($originalGlyphIdx, &$maxdepth, &$depth, &$points, &$contours) {
$depth++;
$maxdepth = max($maxdepth, $depth);
if (count($this->glyphdata[$originalGlyphIdx]['compGlyphs'])) {
foreach($this->glyphdata[$originalGlyphIdx]['compGlyphs'] AS $glyphIdx) {
$this->getGlyphData($glyphIdx, $maxdepth, $depth, $points, $contours);
}
}
else if (($this->glyphdata[$originalGlyphIdx]['nContours'] > 0) && $depth > 0) { // simple
$contours += $this->glyphdata[$originalGlyphIdx]['nContours'];
$points += $this->glyphdata[$originalGlyphIdx]['nPoints'];
}
$depth--;
}
//////////////////////////////////////////////////////////////////////////////////
// Recursively get composite glyphs
function getGlyphs($originalGlyphIdx, &$start, &$glyphSet, &$subsetglyphs) {
$glyphPos = $this->glyphPos[$originalGlyphIdx];
$glyphLen = $this->glyphPos[$originalGlyphIdx + 1] - $glyphPos;
if (!$glyphLen) {
return;
}
$this->seek($start + $glyphPos);
$numberOfContours = $this->read_short();
if ($numberOfContours < 0) {
$this->skip(8);
$flags = GF_MORE;
while ($flags & GF_MORE) {
$flags = $this->read_ushort();
$glyphIdx = $this->read_ushort();
if (!isset($glyphSet[$glyphIdx])) {
$glyphSet[$glyphIdx] = count($subsetglyphs); // old glyphID to new glyphID
$subsetglyphs[$glyphIdx] = true;
}
$savepos = ftell($this->fh);
$this->getGlyphs($glyphIdx, $start, $glyphSet, $subsetglyphs);
$this->seek($savepos);
if ($flags & GF_WORDS)
$this->skip(4);
else
$this->skip(2);
if ($flags & GF_SCALE)
$this->skip(2);
else if ($flags & GF_XYSCALE)
$this->skip(4);
else if ($flags & GF_TWOBYTWO)
$this->skip(8);
}
}
}
//////////////////////////////////////////////////////////////////////////////////
function getHMTX($numberOfHMetrics, $numGlyphs, &$glyphToChar, $scale) {
$start = $this->seek_table("hmtx");
$aw = 0;
$this->charWidths = str_pad('', 256*256*2, "\x00");
$nCharWidths = 0;
if (($numberOfHMetrics*4) < $this->maxStrLenRead) {
$data = $this->get_chunk($start,($numberOfHMetrics*4));
$arr = unpack("n*", $data);
}
else { $this->seek($start); }
for( $glyph=0; $glyph<$numberOfHMetrics; $glyph++) {
if (($numberOfHMetrics*4) < $this->maxStrLenRead) {
$aw = $arr[($glyph*2)+1];
}
else {
$aw = $this->read_ushort();
$lsb = $this->read_ushort();
}
if (isset($glyphToChar[$glyph]) || $glyph == 0) {
if ($aw >= (1 << 15) ) { $aw = 0; } // 1.03 Some (arabic) fonts have -ve values for width
// although should be unsigned value - comes out as e.g. 65108 (intended -50)
if ($glyph == 0) {
$this->defaultWidth = $scale*$aw;
continue;
}
foreach($glyphToChar[$glyph] AS $char) {
if ($char != 0 && $char != 65535) {
$w = intval(round($scale*$aw));
if ($w == 0) { $w = 65535; }
if ($char < 196608) {
$this->charWidths[$char*2] = chr($w >> 8);
$this->charWidths[$char*2 + 1] = chr($w & 0xFF);
$nCharWidths++;
}
}
}
}
}
$data = $this->get_chunk(($start+$numberOfHMetrics*4),($numGlyphs*2));
$arr = unpack("n*", $data);
$diff = $numGlyphs-$numberOfHMetrics;
for( $pos=0; $pos<$diff; $pos++) {
$glyph = $pos + $numberOfHMetrics;
if (isset($glyphToChar[$glyph])) {
foreach($glyphToChar[$glyph] AS $char) {
if ($char != 0 && $char != 65535) {
$w = intval(round($scale*$aw));
if ($w == 0) { $w = 65535; }
if ($char < 196608) {
$this->charWidths[$char*2] = chr($w >> 8);
$this->charWidths[$char*2 + 1] = chr($w & 0xFF);
$nCharWidths++;
}
}
}
}
}
// NB 65535 is a set width of 0
// First bytes define number of chars in font
$this->charWidths[0] = chr($nCharWidths >> 8);
$this->charWidths[1] = chr($nCharWidths & 0xFF);
}
function getHMetric($numberOfHMetrics, $gid) {
$start = $this->seek_table("hmtx");
if ($gid < $numberOfHMetrics) {
$this->seek($start+($gid*4));
$hm = fread($this->fh,4);
}
else {
$this->seek($start+(($numberOfHMetrics-1)*4));
$hm = fread($this->fh,2);
$this->seek($start+($numberOfHMetrics*2)+($gid*2));
$hm .= fread($this->fh,2);
}
return $hm;
}
function getLOCA($indexToLocFormat, $numGlyphs) {
$start = $this->seek_table('loca');
$this->glyphPos = array();
if ($indexToLocFormat == 0) {
$data = $this->get_chunk($start,($numGlyphs*2)+2);
$arr = unpack("n*", $data);
for ($n=0; $n<=$numGlyphs; $n++) {
$this->glyphPos[] = ($arr[$n+1] * 2);
}
}
else if ($indexToLocFormat == 1) {
$data = $this->get_chunk($start,($numGlyphs*4)+4);
$arr = unpack("N*", $data);
for ($n=0; $n<=$numGlyphs; $n++) {
$this->glyphPos[] = ($arr[$n+1]);
}
}
else
die('Unknown location table format '.$indexToLocFormat);
}
// CMAP Format 4
function getCMAP4($unicode_cmap_offset, &$glyphToChar, &$charToGlyph ) {
$this->maxUniChar = 0;
$this->seek($unicode_cmap_offset + 2);
$length = $this->read_ushort();
$limit = $unicode_cmap_offset + $length;
$this->skip(2);
$segCount = $this->read_ushort() / 2;
$this->skip(6);
$endCount = array();
for($i=0; $i<$segCount; $i++) { $endCount[] = $this->read_ushort(); }
$this->skip(2);
$startCount = array();
for($i=0; $i<$segCount; $i++) { $startCount[] = $this->read_ushort(); }
$idDelta = array();
for($i=0; $i<$segCount; $i++) { $idDelta[] = $this->read_short(); } // ???? was unsigned short
$idRangeOffset_start = $this->_pos;
$idRangeOffset = array();
for($i=0; $i<$segCount; $i++) { $idRangeOffset[] = $this->read_ushort(); }
for ($n=0;$n<$segCount;$n++) {
$endpoint = ($endCount[$n] + 1);
for ($unichar=$startCount[$n];$unichar<$endpoint;$unichar++) {
if ($idRangeOffset[$n] == 0)
$glyph = ($unichar + $idDelta[$n]) & 0xFFFF;
else {
$offset = ($unichar - $startCount[$n]) * 2 + $idRangeOffset[$n];
$offset = $idRangeOffset_start + 2 * $n + $offset;
if ($offset >= $limit)
$glyph = 0;
else {
$glyph = $this->get_ushort($offset);
if ($glyph != 0)
$glyph = ($glyph + $idDelta[$n]) & 0xFFFF;
}
}
$charToGlyph[$unichar] = $glyph;
if ($unichar < 196608) { $this->maxUniChar = max($unichar,$this->maxUniChar); }
$glyphToChar[$glyph][] = $unichar;
}
}
}
// Put the TTF file together
function endTTFile(&$stm) {
$stm = '';
$numTables = count($this->otables);
$searchRange = 1;
$entrySelector = 0;
while ($searchRange * 2 <= $numTables) {
$searchRange = $searchRange * 2;
$entrySelector = $entrySelector + 1;
}
$searchRange = $searchRange * 16;
$rangeShift = $numTables * 16 - $searchRange;
// Header
if (_TTF_MAC_HEADER) {
$stm .= (pack("Nnnnn", 0x74727565, $numTables, $searchRange, $entrySelector, $rangeShift)); // Mac
}
else {
$stm .= (pack("Nnnnn", 0x00010000 , $numTables, $searchRange, $entrySelector, $rangeShift)); // Windows
}
// Table directory
$tables = $this->otables;
ksort ($tables);
$offset = 12 + $numTables * 16;
foreach ($tables AS $tag=>$data) {
if ($tag == 'head') { $head_start = $offset; }
$stm .= $tag;
$checksum = $this->calcChecksum($data);
$stm .= pack("nn", $checksum[0],$checksum[1]);
$stm .= pack("NN", $offset, mb_strlen($data,'8bit'));
$paddedLength = (mb_strlen($data,'8bit')+3)&~3;
$offset = $offset + $paddedLength;
}
// Table data
foreach ($tables AS $tag=>$data) {
$data .= "\0\0\0";
$stm .= mb_substr($data,0,(mb_strlen($data,'8bit')&~3),'8bit');
}
$checksum = $this->calcChecksum($stm);
$checksum = $this->sub32(array(0xB1B0,0xAFBA), $checksum);
$chk = pack("nn", $checksum[0],$checksum[1]);
$stm = $this->splice($stm,($head_start + 8),$chk);
return $stm ;
}
}
?>