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;
    }
 
    public function getPreloadLinks( ResourceLoaderContext $context ) {
        return $this->getLogoPreloadlinks();
    }
 
    private function getLogoPreloadlinks() {
        $logo = $this->getLogoData( $this->getConfig() );
 
        $logosPerDppx = [];
        $logos = [];
 
        $preloadLinks = [];
 
        if ( !is_array( $logo ) ) {
            // No media queries required if we only have one variant
            $preloadLinks[$logo] = [ 'as' => 'image' ];
            return $preloadLinks;
        }
 
        if ( isset( $logo['svg'] ) ) {
            // No media queries required if we only have a 1x and svg variant
            // because all preload-capable browsers support SVGs
            $preloadLinks[$logo['svg']] = [ 'as' => 'image' ];
            return $preloadLinks;
        }
 
        foreach ( $logo as $dppx => $src ) {
            // Keys are in this format: "1.5x"
            $dppx = substr( $dppx, 0, -1 );
            $logosPerDppx[$dppx] = $src;
        }
 
        // Because PHP can't have floats as array keys
        uksort( $logosPerDppx, function ( $a, $b ) {
            $a = floatval( $a );
            $b = floatval( $b );
            // Sort from smallest to largest (e.g. 1x, 1.5x, 2x)
            return $a <=> $b;
        } );
 
        foreach ( $logosPerDppx as $dppx => $src ) {
            $logos[] = [
                'dppx' => $dppx,
                'src' => $src
            ];
        }
 
        $logosCount = count( $logos );
        // Logic must match ResourceLoaderSkinModule:
        // - 1x applies to resolution < 1.5dppx
        // - 1.5x applies to resolution >= 1.5dppx && < 2dppx
        // - 2x applies to resolution >= 2dppx
        // Note that min-resolution and max-resolution are both inclusive.
        for ( $i = 0; $i < $logosCount; $i++ ) {
            if ( $i === 0 ) {
                // Smallest dppx
                // min-resolution is ">=" (larger than or equal to)
                // "not min-resolution" is essentially "<"
                $media_query = 'not all and (min-resolution: ' . $logos[1]['dppx'] . 'dppx)';
            } elseif ( $i !== $logosCount - 1 ) {
                // In between
                // Media query expressions can only apply "not" to the entire expression
                // (e.g. can't express ">= 1.5 and not >= 2).
                // Workaround: Use <= 1.9999 in place of < 2.
                $upper_bound = floatval( $logos[$i + 1]['dppx'] ) - 0.000001;
                $media_query = '(min-resolution: ' . $logos[$i]['dppx'] .
                    'dppx) and (max-resolution: ' . $upper_bound . 'dppx)';
            } else {
                // Largest dppx
                $media_query = '(min-resolution: ' . $logos[$i]['dppx'] . 'dppx)';
            }
 
            $preloadLinks[$logos[$i]['src']] = [
                'as' => 'image',
                'media' => $media_query
            ];
        }
 
        return $preloadLinks;
    }
 
    private function normalizeStyles( &$styles ) {
        foreach ( $styles as $key => $val ) {
            if ( !is_array( $val ) ) {
                $styles[$key] = [ $val ];
            }
        }
    }
 
    protected function getLogoData( 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;
    }
}