Merge "RevisionStoreDbTestBase, remove redundant needsDB override"

[lhc/web/wiklou.git] / includes / resourceloader / ResourceLoaderSkinModule.php

diff --git a/includes/resourceloader/ResourceLoaderSkinModule.php b/includes/resourceloader/ResourceLoaderSkinModule.php
index de25d32..e0fbeee 100644 (file)
--- a/includes/resourceloader/ResourceLoaderSkinModule.php
+++ b/includes/resourceloader/ResourceLoaderSkinModule.php
@@ -76,6 +76,89 @@ class ResourceLoaderSkinModule extends ResourceLoaderFileModule {
                return $styles;
        }
 
+       /**
+        * @param ResourceLoaderContext $context
+        * @return array
+        */
+       public function getPreloadLinks( ResourceLoaderContext $context ) {
+               return $this->getLogoPreloadlinks();
+       }
+
+       /**
+        * Helper method for getPreloadLinks()
+        * @return array
+        */
+       private function getLogoPreloadlinks() {
+               $logo = $this->getLogoData( $this->getConfig() );
+
+               $tags = [];
+               $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;
+       }
+
        /**
         * Ensure all media keys use array values.
         *
@@ -93,25 +176,14 @@ class ResourceLoaderSkinModule extends ResourceLoaderFileModule {
        }
 
        /**
-        * Non-static proxy to ::getLogo (for overloading in sub classes or tests).
-        *
-        * @codeCoverageIgnore
         * @since 1.31
-        * @param Config $conf
-        * @return string|array
-        */
-       protected function getLogoData( Config $conf ) {
-               return static::getLogo( $conf );
-       }
-
-       /**
         * @param Config $conf
         * @return string|array Single url if no variants are defined,
         *  or an array of logo urls keyed by dppx in form "<float>x".
         *  Key "1x" is always defined. Key "svg" may also be defined,
         *  in which case variants other than "1x" are omitted.
         */
-       public static function getLogo( Config $conf ) {
+       protected function getLogoData( Config $conf ) {
                $logo = $conf->get( 'Logo' );
                $logoHD = $conf->get( 'LogoHD' );