<?php

/**
 * Class GDLuminanceSource
 *
 * @created      17.01.2021
 * @author       Ashot Khanamiryan
 * @author       Smiley <smiley@chillerlan.net>
 * @copyright    2021 Smiley
 * @license      MIT
 *
 * @noinspection PhpComposerExtensionStubsInspection
 */
namespace WCPOS\Vendor\chillerlan\QRCode\Common;

use WCPOS\Vendor\chillerlan\QRCode\Decoder\QRCodeDecoderException;
use WCPOS\Vendor\chillerlan\Settings\SettingsContainerInterface;
use function file_get_contents, get_resource_type, imagecolorat, imagecolorsforindex, imagecreatefromstring, imagefilter, imagesx, imagesy, is_resource;
use const IMG_FILTER_BRIGHTNESS, IMG_FILTER_CONTRAST, IMG_FILTER_GRAYSCALE, IMG_FILTER_NEGATE, PHP_MAJOR_VERSION;
/**
 * This class is used to help decode images from files which arrive as GD Resource
 * It does not support rotation.
 */
class GDLuminanceSource extends LuminanceSourceAbstract
{
    /**
     * @var resource|\GdImage
     */
    protected $gdImage;
    /**
     * GDLuminanceSource constructor.
     *
     * @param resource|\GdImage                                    $gdImage
     * @param \chillerlan\Settings\SettingsContainerInterface|null $options
     *
     * @throws \chillerlan\QRCode\Decoder\QRCodeDecoderException
     */
    public function __construct($gdImage, ?SettingsContainerInterface $options = null)
    {
        /** @noinspection PhpFullyQualifiedNameUsageInspection */
        if (PHP_MAJOR_VERSION >= 8 && !$gdImage instanceof \GdImage || PHP_MAJOR_VERSION < 8 && (!is_resource($gdImage) || get_resource_type($gdImage) !== 'gd')) {
            throw new QRCodeDecoderException('Invalid GD image source.');
            // @codeCoverageIgnore
        }
        parent::__construct(imagesx($gdImage), imagesy($gdImage), $options);
        $this->gdImage = $gdImage;
        if ($this->options->readerGrayscale) {
            imagefilter($this->gdImage, IMG_FILTER_GRAYSCALE);
        }
        if ($this->options->readerInvertColors) {
            imagefilter($this->gdImage, IMG_FILTER_NEGATE);
        }
        if ($this->options->readerIncreaseContrast) {
            imagefilter($this->gdImage, IMG_FILTER_BRIGHTNESS, -100);
            imagefilter($this->gdImage, IMG_FILTER_CONTRAST, -100);
        }
        $this->setLuminancePixels();
    }
    /**
     *
     */
    protected function setLuminancePixels() : void
    {
        for ($j = 0; $j < $this->height; $j++) {
            for ($i = 0; $i < $this->width; $i++) {
                $argb = imagecolorat($this->gdImage, $i, $j);
                $pixel = imagecolorsforindex($this->gdImage, $argb);
                $this->setLuminancePixel($pixel['red'], $pixel['green'], $pixel['blue']);
            }
        }
    }
    /** @inheritDoc */
    public static function fromFile(string $path, ?SettingsContainerInterface $options = null) : self
    {
        return new self(imagecreatefromstring(file_get_contents(self::checkFile($path))), $options);
    }
    /** @inheritDoc */
    public static function fromBlob(string $blob, ?SettingsContainerInterface $options = null) : self
    {
        return new self(imagecreatefromstring($blob), $options);
    }
}