# woocommerce-pos/1.10.20/vendor_prefixed/chillerlan/php-qrcode/src/Common/LuminanceSourceAbstract.php

WCPOS – Point of Sale (POS) plugin for WooCommerce, version 1.10.20. 94 lines.

- Page: https://pluginprobe.com/plugins/woocommerce-pos/1.10.20/code/vendor_prefixed/chillerlan/php-qrcode/src/Common/LuminanceSourceAbstract.php
- Raw: https://pluginprobe.com/plugins/woocommerce-pos/1.10.20/raw/vendor_prefixed/chillerlan/php-qrcode/src/Common/LuminanceSourceAbstract.php
- Modified: 2026-06-09T13:55:26+00:00

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```php
<?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 WCPOS\Vendor\chillerlan\QRCode\Common;

use WCPOS\Vendor\chillerlan\QRCode\Decoder\QRCodeDecoderException;
use WCPOS\Vendor\chillerlan\QRCode\QROptions;
use WCPOS\Vendor\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 ? $r : ($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;
    }
}

```