crm.fsf.org/20131203/files/sites/all/modules-new/civicrm/vendor/phenx/php-font-lib/src/FontLib/Table/Type/cmap.php

   1 <?php
   2 /**
   3  * @package php-font-lib
   4  * @link    https://github.com/PhenX/php-font-lib
   5  * @author  Fabien Ménager <fabien.menager@gmail.com>
   6  * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
   7  */
   8
   9 namespace FontLib\Table\Type;
  10 use FontLib\Table\Table;
  11
  12 /**
  13  * `cmap` font table.
  14  *
  15  * @package php-font-lib
  16  */
  17 class cmap extends Table {
  18   private static $header_format = array(
  19     "version"         => self::uint16,
  20     "numberSubtables" => self::uint16,
  21   );
  22
  23   private static $subtable_header_format = array(
  24     "platformID"         => self::uint16,
  25     "platformSpecificID" => self::uint16,
  26     "offset"             => self::uint32,
  27   );
  28
  29   private static $subtable_v4_format = array(
  30     "length"        => self::uint16,
  31     "language"      => self::uint16,
  32     "segCountX2"    => self::uint16,
  33     "searchRange"   => self::uint16,
  34     "entrySelector" => self::uint16,
  35     "rangeShift"    => self::uint16,
  36   );
  37
  38   protected function _parse() {
  39     $font = $this->getFont();
  40
  41     $cmap_offset = $font->pos();
  42
  43     $data = $font->unpack(self::$header_format);
  44
  45     $subtables = array();
  46     for ($i = 0; $i < $data["numberSubtables"]; $i++) {
  47       $subtables[] = $font->unpack(self::$subtable_header_format);
  48     }
  49     $data["subtables"] = $subtables;
  50
  51     foreach ($data["subtables"] as $i => &$subtable) {
  52       $font->seek($cmap_offset + $subtable["offset"]);
  53
  54       $subtable["format"] = $font->readUInt16();
  55
  56       // @todo Only CMAP version 4
  57       if ($subtable["format"] != 4) {
  58         unset($data["subtables"][$i]);
  59         $data["numberSubtables"]--;
  60         continue;
  61       }
  62
  63       $subtable += $font->unpack(self::$subtable_v4_format);
  64       $segCount             = $subtable["segCountX2"] / 2;
  65       $subtable["segCount"] = $segCount;
  66
  67       $endCode = $font->r(array(self::uint16, $segCount));
  68
  69       $font->readUInt16(); // reservedPad
  70
  71       $startCode = $font->r(array(self::uint16, $segCount));
  72       $idDelta   = $font->r(array(self::int16, $segCount));
  73
  74       $ro_start      = $font->pos();
  75       $idRangeOffset = $font->r(array(self::uint16, $segCount));
  76
  77       $glyphIndexArray = array();
  78       for ($i = 0; $i < $segCount; $i++) {
  79         $c1 = $startCode[$i];
  80         $c2 = $endCode[$i];
  81         $d  = $idDelta[$i];
  82         $ro = $idRangeOffset[$i];
  83
  84         if ($ro > 0) {
  85           $font->seek($subtable["offset"] + 2 * $i + $ro);
  86         }
  87
  88         for ($c = $c1; $c <= $c2; $c++) {
  89           if ($ro == 0) {
  90             $gid = ($c + $d) & 0xFFFF;
  91           }
  92           else {
  93             $offset = ($c - $c1) * 2 + $ro;
  94             $offset = $ro_start + 2 * $i + $offset;
  95
  96             $font->seek($offset);
  97             $gid = $font->readUInt16();
  98
  99             if ($gid != 0) {
 100               $gid = ($gid + $d) & 0xFFFF;
 101             }
 102           }
 103
 104           if ($gid > 0) {
 105             $glyphIndexArray[$c] = $gid;
 106           }
 107         }
 108       }
 109
 110       $subtable += array(
 111         "endCode"         => $endCode,
 112         "startCode"       => $startCode,
 113         "idDelta"         => $idDelta,
 114         "idRangeOffset"   => $idRangeOffset,
 115         "glyphIndexArray" => $glyphIndexArray,
 116       );
 117     }
 118
 119     $this->data = $data;
 120   }
 121
 122   function _encode() {
 123     $font = $this->getFont();
 124
 125     $subset          = $font->getSubset();
 126     $glyphIndexArray = $font->getUnicodeCharMap();
 127
 128     $newGlyphIndexArray = array();
 129     foreach ($glyphIndexArray as $code => $gid) {
 130       $new_gid = array_search($gid, $subset);
 131       if ($new_gid !== false) {
 132         $newGlyphIndexArray[$code] = $new_gid;
 133       }
 134     }
 135
 136     ksort($newGlyphIndexArray); // Sort by char code
 137
 138     $segments = array();
 139
 140     $i        = -1;
 141     $prevCode = 0xFFFF;
 142     $prevGid  = 0xFFFF;
 143
 144     foreach ($newGlyphIndexArray as $code => $gid) {
 145       if (
 146         $prevCode + 1 != $code ||
 147         $prevGid + 1 != $gid
 148       ) {
 149         $i++;
 150         $segments[$i] = array();
 151       }
 152
 153       $segments[$i][] = array($code, $gid);
 154
 155       $prevCode = $code;
 156       $prevGid  = $gid;
 157     }
 158
 159     $segments[][] = array(0xFFFF, 0xFFFF);
 160
 161     $startCode = array();
 162     $endCode   = array();
 163     $idDelta   = array();
 164
 165     foreach ($segments as $codes) {
 166       $start = reset($codes);
 167       $end   = end($codes);
 168
 169       $startCode[] = $start[0];
 170       $endCode[]   = $end[0];
 171       $idDelta[]   = $start[1] - $start[0];
 172     }
 173
 174     $segCount      = count($startCode);
 175     $idRangeOffset = array_fill(0, $segCount, 0);
 176
 177     $searchRange   = 1;
 178     $entrySelector = 0;
 179     while ($searchRange * 2 <= $segCount) {
 180       $searchRange *= 2;
 181       $entrySelector++;
 182     }
 183     $searchRange *= 2;
 184     $rangeShift = $segCount * 2 - $searchRange;
 185
 186     $subtables = array(
 187       array(
 188         // header
 189         "platformID"         => 3, // Unicode
 190         "platformSpecificID" => 1,
 191         "offset"             => null,
 192
 193         // subtable
 194         "format"             => 4,
 195         "length"             => null,
 196         "language"           => 0,
 197         "segCount"           => $segCount,
 198         "segCountX2"         => $segCount * 2,
 199         "searchRange"        => $searchRange,
 200         "entrySelector"      => $entrySelector,
 201         "rangeShift"         => $rangeShift,
 202         "startCode"          => $startCode,
 203         "endCode"            => $endCode,
 204         "idDelta"            => $idDelta,
 205         "idRangeOffset"      => $idRangeOffset,
 206         "glyphIndexArray"    => $newGlyphIndexArray,
 207       )
 208     );
 209
 210     $data = array(
 211       "version"         => 0,
 212       "numberSubtables" => count($subtables),
 213       "subtables"       => $subtables,
 214     );
 215
 216     $length = $font->pack(self::$header_format, $data);
 217
 218     $subtable_headers_size   = $data["numberSubtables"] * 8; // size of self::$subtable_header_format
 219     $subtable_headers_offset = $font->pos();
 220
 221     $length += $font->write(str_repeat("\0", $subtable_headers_size), $subtable_headers_size);
 222
 223     // write subtables data
 224     foreach ($data["subtables"] as $i => $subtable) {
 225       $length_before                   = $length;
 226       $data["subtables"][$i]["offset"] = $length;
 227
 228       $length += $font->writeUInt16($subtable["format"]);
 229
 230       $before_subheader = $font->pos();
 231       $length += $font->pack(self::$subtable_v4_format, $subtable);
 232
 233       $segCount = $subtable["segCount"];
 234       $length += $font->w(array(self::uint16, $segCount), $subtable["endCode"]);
 235       $length += $font->writeUInt16(0); // reservedPad
 236       $length += $font->w(array(self::uint16, $segCount), $subtable["startCode"]);
 237       $length += $font->w(array(self::int16, $segCount), $subtable["idDelta"]);
 238       $length += $font->w(array(self::uint16, $segCount), $subtable["idRangeOffset"]);
 239       $length += $font->w(array(self::uint16, $segCount), array_values($subtable["glyphIndexArray"]));
 240
 241       $after_subtable = $font->pos();
 242
 243       $subtable["length"] = $length - $length_before;
 244       $font->seek($before_subheader);
 245       $length += $font->pack(self::$subtable_v4_format, $subtable);
 246
 247       $font->seek($after_subtable);
 248     }
 249
 250     // write subtables headers
 251     $font->seek($subtable_headers_offset);
 252     foreach ($data["subtables"] as $subtable) {
 253       $font->pack(self::$subtable_header_format, $subtable);
 254     }
 255
 256     return $length;
 257   }
 258 }