ImageInfo.php

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<?php
namespace TYPO3\CMS\Core\Type\File;

use TYPO3\CMS\Core\Imaging\GraphicalFunctions;
use TYPO3\CMS\Core\Log\LogManager;
use TYPO3\CMS\Core\Utility\GeneralUtility;

class ImageInfo extends FileInfo
{
    protected $imageSizes;

    public function getWidth()
    {
        $imageSizes = $this->getImageSizes();
        return $imageSizes[0];
    }

    public function getHeight()
    {
        $imageSizes = $this->getImageSizes();
        return $imageSizes[1];
    }

    protected function getImageSizes()
    {
        if (is_null($this->imageSizes)) {
            $this->imageSizes = getimagesize($this->getPathname());

            // Fallback to IM identify
            if ($this->imageSizes === false) {
                $this->imageSizes = $this->getGraphicalFunctions()->imageMagickIdentify($this->getPathname());
            }

            // Extra fallback for SVG
            if (empty($this->imageSizes) && $this->getMimeType() === 'image/svg+xml') {
                $this->imageSizes = $this->extractSvgImageSizes();
            }

            // In case the image size could not be retrieved, log the incident as a warning.
            if (empty($this->imageSizes)) {
                $this->getLogger()->warning('I could not retrieve the image size for file ' . $this->getPathname());
                $this->imageSizes = array(0, 0);
            }
        }
        return $this->imageSizes;
    }

    protected function extractSvgImageSizes()
    {
        $imagesSizes = array();

        $xml = simplexml_load_file($this->getPathname());
        $xmlAttributes = $xml->attributes();

        // First check if width+height are set
        if (!empty($xmlAttributes['width']) && !empty($xmlAttributes['height'])) {
            $imagesSizes = array((int)$xmlAttributes['width'], (int)$xmlAttributes['height']);

        // Fallback to viewBox
        } elseif (!empty($xmlAttributes['viewBox'])) {
            $viewBox = explode(' ', $xmlAttributes['viewBox']);
            $imagesSizes = array((int)$viewBox[2], (int)$viewBox[3]);
        }

        return $imagesSizes !== array() ? $imagesSizes : false;
    }

    protected function getLogger()
    {
        $loggerManager = GeneralUtility::makeInstance(LogManager::class);

        return $loggerManager->getLogger(get_class($this));
    }

    protected function getGraphicalFunctions()
    {
        static $graphicalFunctions = null;

        if ($graphicalFunctions === null) {
            $graphicalFunctions = GeneralUtility::makeInstance(GraphicalFunctions::class);
        }

        return $graphicalFunctions;
    }
}