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<?php
/**
* @package php-font-lib
* @link https://github.com/PhenX/php-font-lib
* @author Fabien Ménager <fabien.menager@gmail.com>
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
*/
namespace FontLib\Table\Type;
use FontLib\Table\Table;
/**
* `hmtx` font table.
*
* @package php-font-lib
*/
class hmtx extends Table {
protected function _parse() {
$font = $this->getFont();
$offset = $font->pos();
$numOfLongHorMetrics = $font->getData("hhea", "numOfLongHorMetrics");
$numGlyphs = $font->getData("maxp", "numGlyphs");
$font->seek($offset);
$data = array();
$metrics = $font->readUInt16Many($numOfLongHorMetrics * 2);
for ($gid = 0, $mid = 0; $gid < $numOfLongHorMetrics; $gid++) {
$advanceWidth = isset($metrics[$mid]) ? $metrics[$mid] : 0;
$mid += 1;
$leftSideBearing = isset($metrics[$mid]) ? $metrics[$mid] : 0;
$mid += 1;
$data[$gid] = array($advanceWidth, $leftSideBearing);
}
if ($numOfLongHorMetrics < $numGlyphs) {
$lastWidth = end($data);
$data = array_pad($data, $numGlyphs, $lastWidth);
}
$this->data = $data;
}
protected function _encode() {
$font = $this->getFont();
$subset = $font->getSubset();
$data = $this->data;
$length = 0;
foreach ($subset as $gid) {
$length += $font->writeUInt16($data[$gid][0]);
$length += $font->writeUInt16($data[$gid][1]);
}
return $length;
}
}
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