LogoView.php

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<?php
namespace TYPO3\CMS\Backend\View;

class LogoView {

    protected $logo = '';

    public function __construct() {
        $this->logo = 'gfx/typo3-topbar@2x.png';
    }

    public function render() {
        $imgInfo = getimagesize(PATH_site . TYPO3_mainDir . $this->logo);
        $imgUrl = $this->logo;

        // Overwrite with custom logo
        if ($GLOBALS['TBE_STYLES']['logo']) {
            $imgInfo = @getimagesize(\TYPO3\CMS\Core\Utility\GeneralUtility::resolveBackPath((PATH_typo3 . $GLOBALS['TBE_STYLES']['logo']), 3));
            $imgUrl = $GLOBALS['TBE_STYLES']['logo'];
        }

        // High-res?
        $width = $imgInfo[0];
        $height = $imgInfo[1];

        if (strpos($imgUrl, '@2x.')) {
            $width = $width/2;
            $height = $height/2;
        }

        $logoTag = '<img src="' . $imgUrl . '" width="' . $width . '" height="' . $height . '" title="TYPO3 Content Management System" alt="" />';
        return '<a href="' . TYPO3_URL_GENERAL . '" target="_blank">' . $logoTag . '</a>';
    }

    public function setLogo($logo) {
        if (!is_string($logo)) {
            throw new \InvalidArgumentException('parameter $logo must be of type string', 1194041104);
        }
        $this->logo = $logo;
    }

}