Merge "Detect tofu before applying any default fonts"

Resources.php

@@ -143,10 +143,10 @@ $wgResourceModules['ext.uls.preferences'] = array(
 
 $wgResourceModules['ext.uls.webfonts'] = array(
 	'scripts' => 'resources/js/ext.uls.webfonts.js',
-	'styles' => 'resources/css/ext.uls.webfonts.css',
 	'dependencies' => array(
 		'jquery.webfonts',
 		'ext.uls.init',
+		'jquery.uls.data',
 		'ext.uls.webfonts.repository',
 		'ext.uls.preferences',
 	),

UniversalLanguageSelector.php

@@ -155,7 +155,7 @@ $GLOBALS['wgULSNoImeSelectors'] = array( '#wpCaptchaWord', '.ve-ce-documentNode'
  * Autonym
  * @since 2013.09
  */
-$GLOBALS['wgULSNoWebfontsSelectors'] = array( '.autonym' );
+$GLOBALS['wgULSNoWebfontsSelectors'] = array( '#p-lang li.interlanguage-link > a' );
 
 /**
  * Base path of ULS font repository.

lib/jquery.webfonts.js

@@ -58,13 +58,14 @@
 		/**
 		 * Get the default font family for given language.
 		 * @param {String} language Language code.
+		 * @param {array} classes
 		 * @return {String} Font family name
 		 */
-		getFont: function( language ) {
+		getFont: function( language, classes ) {
 			language = ( language || this.language ).toLowerCase();
 
 			if ( this.options.fontSelector ) {
-				return this.options.fontSelector( this.repository, language );
+				return this.options.fontSelector( this.repository, language, classes );
 			} else {
 				return this.repository.defaultFont( language );
 			}
@@ -199,7 +200,6 @@
 				// Note: it depends on the browser whether this returns font names
 				// which don't exist. In Chrome it does, while in Opera it doesn't.
 				fontFamilyStyle = $element.css( 'fontFamily' );
-
 				// Note: It is unclear whether this can ever be falsy. Maybe also
 				// browser specific.
 				if ( fontFamilyStyle ) {
@@ -220,7 +220,7 @@
 						// browser settings.
 						return;
 					} else {
-						fontFamily = webfonts.getFont( element.lang );
+						fontFamily = webfonts.getFont( element.lang, element.className.split(/\s+/) );
 					}
 
 					if ( !fontFamily ) {
@@ -269,8 +269,8 @@
 
 			// whether the font is inherited from top element to which plugin applied
 			return this.$element.css( 'fontFamily' ) !== elementFontFamily
-				// whether the element has generic font family
-				&& ( $.inArray( elementFontFamily,
+					// whether the element has generic font family
+					&& ( $.inArray( elementFontFamily,
 					['monospace', 'serif', 'cursive','fantasy', 'sans-serif'] ) < 0 );
 		},
 

resources/css/ext.uls.webfonts.css

@@ -1,4 +0,0 @@
-#p-lang li.interlanguage-link,
-.autonym { /* provide autonym class for simplifying the Autonym font usage */
-	font-family: 'Autonym', sans-serif;
-}

resources/js/ext.uls.webfonts.js

@@ -18,7 +18,11 @@
  */
 ( function ( $, mw, undefined ) {
 	'use strict';
-	var mediawikiFontRepository, ulsPreferences;
+	var mediawikiFontRepository, ulsPreferences,
+		// Text to prepend the sample text. 0D00 is an unassigned unicode point.
+		tofuSalt = '\u0D00',
+		// cache languages with tofu.
+		tofuLanguages = {};
 
 	mw.webfonts = mw.webfonts || {};
 	ulsPreferences = mw.uls.preferences();
@@ -48,19 +52,107 @@
 		}
 	};
 
+
+	/**
+	 * Detect tofu
+	 *
+	 * Create a temporary span in the page with fontsize 72px and font-family
+	 * sans-serif for each letter of the text.
+	 * For each of these spans, calculate the width and height. If they are same
+	 * for all spans, we can understand that each of the letter is rendered using
+	 * same glyph - it must be a tofu.
+	 *
+	 * @param {string} text
+	 * @return {boolean}
+	 */
+	function detectTofu( text ) {
+		var index,
+			$fixture,
+			width = {},
+			height = {},
+			length = Math.min( 4, text.length ),
+			detected = false;
+
+		text = tofuSalt + text;
+		$fixture = $( '<span>' )
+			.css( {
+				fontSize: '72px',
+				fontFamily: 'sans-serif'
+			} )
+			.appendTo( 'body' );
+
+		for ( index = 0; index < length; index++ ) {
+			$fixture.text( text[index] );
+			width[index] = $fixture.width() || width[index-1];
+			height[index] = $fixture.height();
+
+			if( index > 0 &&
+				( width[index] !== width[index - 1] ||
+					height[index] !== height[index - 1] )
+			) {
+				detected = false;
+				break;
+			}
+		}
+
+		$fixture.remove();
+
+		if ( index === length ) {
+			detected = true;
+		}
+
+		return detected;
+	}
+
 	mediawikiFontRepository = $.webfonts.repository;
 	mediawikiFontRepository.base = mw.config.get( 'wgULSFontRepositoryBasePath' );
 
 	mw.webfonts.setup = function () {
 		// Initialize webfonts
 		$.fn.webfonts.defaults = $.extend( $.fn.webfonts.defaults, {
-			fontSelector: function ( repository, language ) {
-				var font;
+			 /**
+			  * Font selector - depending the language and optionally
+			  * based on the class given choose a font.
+			  *
+			  * @param {Object} repository
+			  * @param {string} language
+			  * @param {array} classes
+			  */
+			fontSelector: function ( repository, language, classes ) {
+				var font, tofu, autonym, defaultFont;
 
+				if ( !language ) {
+					return null;
+				}
+
+				defaultFont = repository.defaultFont( language );
+
+				if ( classes && $.inArray( 'autonym', classes ) >= 0 ) {
+					autonym = true;
+				}
+
+				// If the user has a font preference, apply it always.
 				font = mw.webfonts.preferences.getFont( language );
+				if ( !font || autonym ) {
+					// Is there any default font for this language?
+					if ( ( !defaultFont || defaultFont === 'system' ) && !autonym ) {
+						return font;
+					}
 
-				if ( !font ) {
-					font = repository.defaultFont( language );
+					// There is a default font for this language,
+					// but check whether the user sees tofu for it.
+					tofu = tofuLanguages[language] ||
+						detectTofu( $.uls.data.getAutonym( language ) );
+
+					if ( tofu ) {
+						mw.log( 'tofu detected for ' + language );
+						// Cache the languages with tofu
+						tofuLanguages[language] = true;
+						font = autonym ? 'Autonym' : defaultFont;
+					} else {
+						// No tofu and no font preference. Use system font.
+						font = 'system';
+					}
 				}
 
 				if ( font === 'system' ) {
@@ -70,15 +162,16 @@
 
 				return font;
 			},
+
 			exclude: ( function () {
 				var excludes = $.fn.webfonts.defaults.exclude;
 
 				if ( mw.user.options.get( 'editfont' ) !== 'default' ) {
-					// Exclude textboxes from webfonts if user has edit area font option
+					// Exclude textboxes from webfonts if the user has edit area font option
 					// set using 'Preferences' page
-					excludes = ( excludes )
-						? excludes + ',textarea'
-						: 'textarea';
+					excludes = ( excludes ) ?
+						excludes + ',textarea' :
+						'textarea';
 				}
 
 				return excludes;