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diff --git a/vendor/chillerlan/php-qrcode/src/Common/LuminanceSourceAbstract.php b/vendor/chillerlan/php-qrcode/src/Common/LuminanceSourceAbstract.php
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index 000000000..e4373b87d
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+++ b/vendor/chillerlan/php-qrcode/src/Common/LuminanceSourceAbstract.php
@@ -0,0 +1,107 @@
+<?php
+/**
+ * Class LuminanceSourceAbstract
+ *
+ * @created      24.01.2021
+ * @author       ZXing Authors
+ * @author       Ashot Khanamiryan
+ * @author       Smiley <smiley@chillerlan.net>
+ * @copyright    2021 Smiley
+ * @license      Apache-2.0
+ */
+
+namespace chillerlan\QRCode\Common;
+
+use chillerlan\QRCode\Decoder\QRCodeDecoderException;
+use chillerlan\QRCode\QROptions;
+use chillerlan\Settings\SettingsContainerInterface;
+use function array_slice, array_splice, file_exists, is_file, is_readable, realpath;
+
+/**
+ * The purpose of this class hierarchy is to abstract different bitmap implementations across
+ * platforms into a standard interface for requesting greyscale luminance values.
+ *
+ * @author dswitkin@google.com (Daniel Switkin)
+ */
+abstract class LuminanceSourceAbstract implements LuminanceSourceInterface{
+
+	/** @var \chillerlan\QRCode\QROptions|\chillerlan\Settings\SettingsContainerInterface */
+	protected SettingsContainerInterface $options;
+	protected array $luminances;
+	protected int   $width;
+	protected int   $height;
+
+	/**
+	 *
+	 */
+	public function __construct(int $width, int $height, ?SettingsContainerInterface $options = null){
+		$this->width   = $width;
+		$this->height  = $height;
+		$this->options = ($options ?? new QROptions);
+
+		$this->luminances = [];
+	}
+
+	/** @inheritDoc */
+	public function getLuminances():array{
+		return $this->luminances;
+	}
+
+	/** @inheritDoc */
+	public function getWidth():int{
+		return $this->width;
+	}
+
+	/** @inheritDoc */
+	public function getHeight():int{
+		return $this->height;
+	}
+
+	/**
+	 * @inheritDoc
+	 * @throws \chillerlan\QRCode\Decoder\QRCodeDecoderException
+	 */
+	public function getRow(int $y):array{
+
+		if($y < 0 || $y >= $this->getHeight()){
+			throw new QRCodeDecoderException('Requested row is outside the image: '.$y);
+		}
+
+		$arr = [];
+
+		array_splice($arr, 0, $this->width, array_slice($this->luminances, ($y * $this->width), $this->width));
+
+		return $arr;
+	}
+
+	/**
+	 *
+	 */
+	protected function setLuminancePixel(int $r, int $g, int $b):void{
+		$this->luminances[] = ($r === $g && $g === $b)
+			// Image is already greyscale, so pick any channel.
+			? $r // (($r + 128) % 256) - 128;
+			// Calculate luminance cheaply, favoring green.
+			: (($r + 2 * $g + $b) / 4); // (((($r + 2 * $g + $b) / 4) + 128) % 256) - 128;
+	}
+
+	/**
+	 * @throws \chillerlan\QRCode\Decoder\QRCodeDecoderException
+	 */
+	protected static function checkFile(string $path):string{
+		$path = trim($path);
+
+		if(!file_exists($path) || !is_file($path) || !is_readable($path)){
+			throw new QRCodeDecoderException('invalid file: '.$path);
+		}
+
+		$realpath = realpath($path);
+
+		if($realpath === false){
+			throw new QRCodeDecoderException('unable to resolve path: '.$path);
+		}
+
+		return $realpath;
+	}
+
+}