ImageResizeAfterProductSave.php

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<?php
declare(strict_types=1);

namespace Magento\Catalog\Observer;

use Magento\Framework\Event\ObserverInterface;
use Magento\Framework\App\State;
use Magento\MediaStorage\Service\ImageResize;

class ImageResizeAfterProductSave implements ObserverInterface
{
    private $imageResize;

    private $state;

    public function __construct(
        ImageResize $imageResize,
        State $state
    ) {
        $this->imageResize = $imageResize;
        $this->state = $state;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $product = $observer->getEvent()->getProduct();

        if ($this->state->isAreaCodeEmulated()) {
            return;
        }

        if (!(bool) $product->getId()) {
            foreach ($product->getMediaGalleryImages() as $image) {
                $this->imageResize->resizeFromImageName($image->getFile());
            }
        } else {
            $new = $product->getData('media_gallery');
            $original = $product->getOrigData('media_gallery');
            $mediaGallery = !empty($new['images']) ? array_column($new['images'], 'file') : [];
            $mediaOriginalGallery = !empty($original['images']) ? array_column($original['images'], 'file') : [];

            foreach (array_diff($mediaGallery, $mediaOriginalGallery) as $image) {
                $this->imageResize->resizeFromImageName($image);
            }
        }
    }
}