vendor/phenx/php-font-lib/src/FontLib/Table/Type/loca.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  * `loca` font table.
  14  *
  15  * @package php-font-lib
  16  */
  17 class loca extends Table {
  18   protected function _parse() {
  19     $font   = $this->getFont();
  20     $offset = $font->pos();
  21
  22     $indexToLocFormat = $font->getData("head", "indexToLocFormat");
  23     $numGlyphs        = $font->getData("maxp", "numGlyphs");
  24
  25     $font->seek($offset);
  26
  27     $data = array();
  28
  29     // 2 bytes
  30     if ($indexToLocFormat == 0) {
  31       $d   = $font->read(($numGlyphs + 1) * 2);
  32       $loc = unpack("n*", $d);
  33
  34       for ($i = 0; $i <= $numGlyphs; $i++) {
  35         $data[] = isset($loc[$i + 1]) ?  $loc[$i + 1] * 2 : 0;
  36       }
  37     }
  38
  39     // 4 bytes
  40     else {
  41       if ($indexToLocFormat == 1) {
  42         $d   = $font->read(($numGlyphs + 1) * 4);
  43         $loc = unpack("N*", $d);
  44
  45         for ($i = 0; $i <= $numGlyphs; $i++) {
  46           $data[] = isset($loc[$i + 1]) ? $loc[$i + 1] : 0;
  47         }
  48       }
  49     }
  50
  51     $this->data = $data;
  52   }
  53
  54   function _encode() {
  55     $font = $this->getFont();
  56     $data = $this->data;
  57
  58     $indexToLocFormat = $font->getData("head", "indexToLocFormat");
  59     $numGlyphs        = $font->getData("maxp", "numGlyphs");
  60     $length           = 0;
  61
  62     // 2 bytes
  63     if ($indexToLocFormat == 0) {
  64       for ($i = 0; $i <= $numGlyphs; $i++) {
  65         $length += $font->writeUInt16($data[$i] / 2);
  66       }
  67     }
  68
  69     // 4 bytes
  70     else {
  71       if ($indexToLocFormat == 1) {
  72         for ($i = 0; $i <= $numGlyphs; $i++) {
  73           $length += $font->writeUInt32($data[$i]);
  74         }
  75       }
  76     }
  77
  78     return $length;
  79   }
  80 }