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https://github.com/chillerlan/php-qrcode.git
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codemasher
93 lines
2.3 KiB
PHP
93 lines
2.3 KiB
PHP
<?php
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/**
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* Class MaskPattern
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*
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* @created 19.01.2021
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* @author smiley <smiley@chillerlan.net>
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* @copyright 2021 smiley
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* @license MIT
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*/
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namespace chillerlan\QRCode\Common;
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use chillerlan\QRCode\QRCodeException;
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use Closure;
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/**
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* ISO/IEC 18004:2000 Section 8.8.1
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*/
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final class MaskPattern{
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public const PATTERN_000 = 0b000;
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public const PATTERN_001 = 0b001;
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public const PATTERN_010 = 0b010;
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public const PATTERN_011 = 0b011;
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public const PATTERN_100 = 0b100;
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public const PATTERN_101 = 0b101;
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public const PATTERN_110 = 0b110;
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public const PATTERN_111 = 0b111;
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/**
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* @var int[]
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*/
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public const PATTERNS = [
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self::PATTERN_000,
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self::PATTERN_001,
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self::PATTERN_010,
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self::PATTERN_011,
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self::PATTERN_100,
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self::PATTERN_101,
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self::PATTERN_110,
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self::PATTERN_111,
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];
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/**
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* The current mask pattern value (0-7)
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*/
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private int $maskPattern;
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/**
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* MaskPattern constructor.
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*
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* @throws \chillerlan\QRCode\QRCodeException
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*/
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public function __construct(int $maskPattern){
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if((0b111 & $maskPattern) !== $maskPattern){
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throw new QRCodeException('invalid mask pattern');
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}
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$this->maskPattern = $maskPattern;
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}
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/**
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* Returns the current mask pattern
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*/
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public function getPattern():int{
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return $this->maskPattern;
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}
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/**
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* Returns a closure that applies the mask for the chosen mask pattern.
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*
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* Note that some versions of the QR code standard have had errors in the section about mask patterns.
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* The information below has been corrected.
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*
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* @see https://www.thonky.com/qr-code-tutorial/mask-patterns
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*/
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public function getMask():Closure{
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// $x = column (width), $y = row (height)
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return [
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self::PATTERN_000 => fn(int $x, int $y):int => ($x + $y) % 2,
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self::PATTERN_001 => fn(int $x, int $y):int => $y % 2,
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self::PATTERN_010 => fn(int $x, int $y):int => $x % 3,
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self::PATTERN_011 => fn(int $x, int $y):int => ($x + $y) % 3,
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self::PATTERN_100 => fn(int $x, int $y):int => ((int)($y / 2) + (int)($x / 3)) % 2,
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self::PATTERN_101 => fn(int $x, int $y):int => (($x * $y) % 2) + (($x * $y) % 3),
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self::PATTERN_110 => fn(int $x, int $y):int => ((($x * $y) % 2) + (($x * $y) % 3)) % 2,
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self::PATTERN_111 => fn(int $x, int $y):int => ((($x * $y) % 3) + (($x + $y) % 2)) % 2,
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][$this->maskPattern];
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}
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}
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