ResourceLoaderSkinModule.php

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<?php
class ResourceLoaderSkinModule extends ResourceLoaderFileModule {
    public $targets = [ 'desktop', 'mobile' ];
 
    public function getStyles( ResourceLoaderContext $context ) {
        $logo = $this->getLogoData( $this->getConfig() );
        $styles = parent::getStyles( $context );
        $this->normalizeStyles( $styles );
 
        $default = !is_array( $logo ) ? $logo : $logo['1x'];
        $styles['all'][] = '.mw-wiki-logo { background-image: ' .
                CSSMin::buildUrlValue( $default ) .
                '; }';
 
        if ( is_array( $logo ) ) {
            if ( isset( $logo['svg'] ) ) {
                $styles['all'][] = '.mw-wiki-logo { ' .
                    'background-image: -webkit-linear-gradient(transparent, transparent), ' .
                        CSSMin::buildUrlValue( $logo['svg'] ) . '; ' .
                    'background-image: linear-gradient(transparent, transparent), ' .
                        CSSMin::buildUrlValue( $logo['svg'] ) . ';' .
                    'background-size: 135px auto; }';
            } else {
                if ( isset( $logo['1.5x'] ) ) {
                    $styles[
                        '(-webkit-min-device-pixel-ratio: 1.5), ' .
                        '(min--moz-device-pixel-ratio: 1.5), ' .
                    '(min-resolution: 1.5dppx), ' .
                        '(min-resolution: 144dpi)'
                    ][] = '.mw-wiki-logo { background-image: ' .
                    CSSMin::buildUrlValue( $logo['1.5x'] ) . ';' .
                    'background-size: 135px auto; }';
                }
                if ( isset( $logo['2x'] ) ) {
                    $styles[
                        '(-webkit-min-device-pixel-ratio: 2), ' .
                        '(min--moz-device-pixel-ratio: 2), ' .
                        '(min-resolution: 2dppx), ' .
                        '(min-resolution: 192dpi)'
                    ][] = '.mw-wiki-logo { background-image: ' .
                    CSSMin::buildUrlValue( $logo['2x'] ) . ';' .
                    'background-size: 135px auto; }';
                }
            }
        }
 
        return $styles;
    }
 
    private function normalizeStyles( &$styles ) {
        foreach ( $styles as $key => $val ) {
            if ( !is_array( $val ) ) {
                $styles[$key] = [ $val ];
            }
        }
    }
 
    protected function getLogoData( Config $conf ) {
        return static::getLogo( $conf );
    }
 
    public static function getLogo( Config $conf ) {
        $logo = $conf->get( 'Logo' );
        $logoHD = $conf->get( 'LogoHD' );
 
        $logo1Url = OutputPage::transformResourcePath( $conf, $logo );
 
        if ( !$logoHD ) {
            return $logo1Url;
        }
 
        $logoUrls = [
            '1x' => $logo1Url,
        ];
 
        if ( isset( $logoHD['svg'] ) ) {
            $logoUrls['svg'] = OutputPage::transformResourcePath(
                $conf,
                $logoHD['svg']
            );
        } else {
            // Only 1.5x and 2x are supported
            if ( isset( $logoHD['1.5x'] ) ) {
                $logoUrls['1.5x'] = OutputPage::transformResourcePath(
                    $conf,
                    $logoHD['1.5x']
                );
            }
            if ( isset( $logoHD['2x'] ) ) {
                $logoUrls['2x'] = OutputPage::transformResourcePath(
                    $conf,
                    $logoHD['2x']
                );
            }
        }
 
        return $logoUrls;
    }
 
    public function isKnownEmpty( ResourceLoaderContext $context ) {
        // Regardless of whether the files are specified, we always
        // provide mw-wiki-logo styles.
        return false;
    }
 
    public function getDefinitionSummary( ResourceLoaderContext $context ) {
        $summary = parent::getDefinitionSummary( $context );
        $summary[] = [
            'logo' => $this->getConfig()->get( 'Logo' ),
            'logoHD' => $this->getConfig()->get( 'LogoHD' ),
        ];
        return $summary;
    }
}