Mask.php

См. документацию.

<?php
 
namespace Bitrix\Main\File\Image;
 
class Mask implements \ArrayAccess
{
    protected $mask = [
        [1, 1, 1],
        [1, 1, 1],
        [1, 1, 1],
    ];

    public function __construct(array $mask = null)
    {
        if($mask !== null)
        {
            $this->mask = $mask;
        }
    }

    public function getValue()
    {
        return $this->mask;
    }

    public function getVector()
    {
        $result = [];
        foreach ($this->mask as $row)
        {
            foreach ($row as $column)
            {
                $result[] = $column;
            }
        }
        return $result;
    }

    public static function createSharpen($precision)
    {
        $mask = null;
        if($precision > 0)
        {
            $k = 1.0/((int)$precision);
            $mask = [
                [-$k, -$k, -$k],
                [-$k, 1+8*$k, -$k],
                [-$k, -$k, -$k],
            ];
        }
        return new static($mask);
    }
 
    public function offsetSet($offset, $value): void
    {
        if(is_null($offset))
        {
            $this->mask[] = $value;
        }
        else
        {
            $this->mask[$offset] = $value;
        }
    }
 
    public function offsetExists($offset): bool
    {
        return isset($this->mask[$offset]);
    }
 
    public function offsetUnset($offset): void
    {
        unset($this->mask[$offset]);
    }
 
    #[\ReturnTypeWillChange]
    public function offsetGet($offset)
    {
        return ($this->mask[$offset] ?? null);
    }
}