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sources/3rdparty/dompdf/lib/php-font-lib/classes/font_table_glyf.cls.php 2.58 KB
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  <?php
  /**
   * @package php-font-lib
   * @link    http://php-font-lib.googlecode.com/
   * @author  Fabien Ménager <fabien.menager@gmail.com>
   * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
   * @version $Id: font_table_glyf.cls.php 40 2012-01-22 21:48:41Z fabien.menager $
   */
  
  /**
   * `glyf` font table.
   * 
   * @package php-font-lib
   */
  class Font_Table_glyf extends Font_Table {
    const ARG_1_AND_2_ARE_WORDS    = 1;
    const ARGS_ARE_XY_VALUES       = 2;
    const ROUND_XY_TO_GRID         = 4;
    const WE_HAVE_A_SCALE          = 8;
    const MORE_COMPONENTS          = 32;
    const WE_HAVE_AN_X_AND_Y_SCALE = 64;
    const WE_HAVE_A_TWO_BY_TWO     = 128;
    const WE_HAVE_INSTRUCTIONS     = 256;
    const USE_MY_METRICS           = 512;
    const OVERLAP_COMPOUND         = 1024;
    
    protected function getGlyphData($offset, $loca, $gid){
      $font = $this->getFont();
      
      /*$entryStart = $this->entry->offset;
      $start = $entryStart + $loca[$gid];
      $font->seek($start);
      
      $data = $font->unpack(array(
        "numberOfContours" => self::int16,
        "xMin" => self::FWord,
        "yMin" => self::FWord,
        "xMax" => self::FWord,
        "yMax" => self::FWord,
      ));
      
      $data["outline"] = $font->read($loca[$gid+1] - $font->pos() - $entryStart);*/
      
      $font->seek($offset + $loca[$gid]);
      return $font->read($loca[$gid+1] - $loca[$gid]);
    }
    
    protected function _parse(){
      $font = $this->getFont();
      $offset = $font->pos();
      
      $loca = $font->getData("loca");
      $real_loca = array_slice($loca, 0, -1); // Not the last dummy loca entry
      
      $data = array();
      
      foreach($real_loca as $gid => $location) {
        $data[$gid] = $this->getGlyphData($offset, $loca, $gid);
      }
      
      $this->data = $data;
    }
    
    protected function _encode() {
      $font = $this->getFont();
      $subset = $font->getSubset();
      $compoundGlyphOffsets = $font->compound_glyph_offsets;
      $data = $this->data;
      
      $loca = array();
      
      $length = 0;
      foreach($subset as $gid) {
        $loca[] = $length;
        $raw = $data[$gid];
        $len = strlen($raw);
        
        if (isset($compoundGlyphOffsets[$gid])) {
          $offsets = $compoundGlyphOffsets[$gid];
          foreach($offsets as $offset => $newGid) {
            list($raw[$offset], $raw[$offset+1]) = pack("n", $newGid);
          }
        }
        
        $length += $font->write($raw, strlen($raw));
      }
      
      $loca[] = $length; // dummy loca
      $font->getTableObject("loca")->data = $loca;
      
      return $length;
    }
  }