<?php

/**
 * @package php-font-lib
 * @link    https://github.com/dompdf/php-font-lib
 * @author  Fabien Ménager <fabien.menager@gmail.com>
 * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 */
namespace DynamicOOOS\FontLib\Table\Type;

use DynamicOOOS\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)[0];
            $numLeft = $numGlyphs - $numOfLongHorMetrics;
            $metrics = $font->readUInt16Many($numLeft);
            for ($i = 0; $i < $numLeft; $i++) {
                $gid = $numOfLongHorMetrics + $i;
                $leftSideBearing = isset($metrics[$i]) ? $metrics[$i] : 0;
                $data[$gid] = array($lastWidth, $leftSideBearing);
            }
        }
        $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;
    }
}
