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1<?php
2/**
3 * Pop PHP Framework (https://www.popphp.org/)
4 *
5 * @link       https://github.com/popphp/popphp-framework
6 * @author     Nick Sagona, III <dev@noladev.com>
7 * @copyright  Copyright (c) 2009-2025 NOLA Interactive, LLC.
8 * @license    https://www.popphp.org/license     New BSD License
9 */
10
11/**
12 * @namespace
13 */
14namespace Pop\Pdf\Build\Font\TrueType\Table;
15
16/**
17 * HHEA table class
18 *
19 * @category   Pop
20 * @package    Pop\Pdf
21 * @author     Nick Sagona, III <dev@noladev.com>
22 * @copyright  Copyright (c) 2009-2025 NOLA Interactive, LLC.
23 * @license    https://www.popphp.org/license     New BSD License
24 * @version    5.2.2
25 */
26class Hhea extends AbstractTable
27{
28
29    /**
30     * Font table properties
31     * @var array
32     */
33    protected array $properties = [
34        'ascent'           => 0,
35        'descent'          => 0,
36        'numberOfHMetrics' => 0
37    ];
38
39    /**
40     * Constructor
41     *
42     * Instantiate a TTF 'hhea' table object.
43     *
44     * @param  \Pop\Pdf\Build\Font\TrueType $font
45     */
46    public function __construct(\Pop\Pdf\Build\Font\TrueType $font)
47    {
48        $bytePos = $font->tableInfo['hhea']->offset + 4;
49
50        $ary = unpack(
51            'nascent/' .
52            'ndescent', $font->read($bytePos, 4)
53        );
54
55        $ary = $font->shiftToSigned($ary);
56        $this->properties['ascent']  = $font->toEmSpace($ary['ascent']);
57        $this->properties['descent'] = $font->toEmSpace($ary['descent']);
58
59        $bytePos = $font->tableInfo['hhea']->offset + 34;
60        $ary = unpack('nnumberOfHMetrics/', $font->read($bytePos, 2));
61        $this->properties['numberOfHMetrics'] = $ary['numberOfHMetrics'];
62    }
63
64}