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+/**
+ * @output wp-includes/js/wp-emoji-loader.js
+ */
+
+( function( window, document, settings ) {
+ var src, ready, ii, tests;
+
+ // Create a canvas element for testing native browser support of emoji.
+ var canvas = document.createElement( 'canvas' );
+ var context = canvas.getContext && canvas.getContext( '2d' );
+
+ /**
+ * Checks if two sets of Emoji characters render the same visually.
+ *
+ * @since 4.9.0
+ *
+ * @private
+ *
+ * @param {number[]} set1 Set of Emoji character codes.
+ * @param {number[]} set2 Set of Emoji character codes.
+ *
+ * @return {boolean} True if the two sets render the same.
+ */
+ function emojiSetsRenderIdentically( set1, set2 ) {
+ var stringFromCharCode = String.fromCharCode;
+
+ // Cleanup from previous test.
+ context.clearRect( 0, 0, canvas.width, canvas.height );
+ context.fillText( stringFromCharCode.apply( this, set1 ), 0, 0 );
+ var rendered1 = canvas.toDataURL();
+
+ // Cleanup from previous test.
+ context.clearRect( 0, 0, canvas.width, canvas.height );
+ context.fillText( stringFromCharCode.apply( this, set2 ), 0, 0 );
+ var rendered2 = canvas.toDataURL();
+
+ return rendered1 === rendered2;
+ }
+
+ /**
+ * Detects if the browser supports rendering emoji or flag emoji.
+ *
+ * Flag emoji are a single glyph made of two characters, so some browsers
+ * (notably, Firefox OS X) don't support them.
+ *
+ * @since 4.2.0
+ *
+ * @private
+ *
+ * @param {string} type Whether to test for support of "flag" or "emoji".
+ *
+ * @return {boolean} True if the browser can render emoji, false if it cannot.
+ */
+ function browserSupportsEmoji( type ) {
+ var isIdentical;
+
+ if ( ! context || ! context.fillText ) {
+ return false;
+ }
+
+ /*
+ * Chrome on OS X added native emoji rendering in M41. Unfortunately,
+ * it doesn't work when the font is bolder than 500 weight. So, we
+ * check for bold rendering support to avoid invisible emoji in Chrome.
+ */
+ context.textBaseline = 'top';
+ context.font = '600 32px Arial';
+
+ switch ( type ) {
+ case 'flag':
+ /*
+ * Test for Transgender flag compatibility. This flag is shortlisted for the Emoji 13 spec,
+ * but has landed in Twemoji early, so we can add support for it, too.
+ *
+ * To test for support, we try to render it, and compare the rendering to how it would look if
+ * the browser doesn't render it correctly (white flag emoji + transgender symbol).
+ */
+ isIdentical = emojiSetsRenderIdentically(
+ [ 0x1F3F3, 0xFE0F, 0x200D, 0x26A7, 0xFE0F ],
+ [ 0x1F3F3, 0xFE0F, 0x200B, 0x26A7, 0xFE0F ]
+ );
+
+ if ( isIdentical ) {
+ return false;
+ }
+
+ /*
+ * Test for UN flag compatibility. This is the least supported of the letter locale flags,
+ * so gives us an easy test for full support.
+ *
+ * To test for support, we try to render it, and compare the rendering to how it would look if
+ * the browser doesn't render it correctly ([U] + [N]).
+ */
+ isIdentical = emojiSetsRenderIdentically(
+ [ 0xD83C, 0xDDFA, 0xD83C, 0xDDF3 ],
+ [ 0xD83C, 0xDDFA, 0x200B, 0xD83C, 0xDDF3 ]
+ );
+
+ if ( isIdentical ) {
+ return false;
+ }
+
+ /*
+ * Test for English flag compatibility. England is a country in the United Kingdom, it
+ * does not have a two letter locale code but rather an five letter sub-division code.
+ *
+ * To test for support, we try to render it, and compare the rendering to how it would look if
+ * the browser doesn't render it correctly (black flag emoji + [G] + [B] + [E] + [N] + [G]).
+ */
+ isIdentical = emojiSetsRenderIdentically(
+ [ 0xD83C, 0xDFF4, 0xDB40, 0xDC67, 0xDB40, 0xDC62, 0xDB40, 0xDC65, 0xDB40, 0xDC6E, 0xDB40, 0xDC67, 0xDB40, 0xDC7F ],
+ [ 0xD83C, 0xDFF4, 0x200B, 0xDB40, 0xDC67, 0x200B, 0xDB40, 0xDC62, 0x200B, 0xDB40, 0xDC65, 0x200B, 0xDB40, 0xDC6E, 0x200B, 0xDB40, 0xDC67, 0x200B, 0xDB40, 0xDC7F ]
+ );
+
+ return ! isIdentical;
+ case 'emoji':
+ /*
+ * Love is love.
+ *
+ * To test for Emoji 12 support, try to render a new emoji: men holding hands, with different skin
+ * tone modifiers.
+ *
+ * When updating this test for future Emoji releases, ensure that individual emoji that make up the
+ * sequence come from older emoji standards.
+ */
+ isIdentical = emojiSetsRenderIdentically(
+ [0xD83D, 0xDC68, 0xD83C, 0xDFFE, 0x200D, 0xD83E, 0xDD1D, 0x200D, 0xD83D, 0xDC68, 0xD83C, 0xDFFC],
+ [0xD83D, 0xDC68, 0xD83C, 0xDFFE, 0x200B, 0xD83E, 0xDD1D, 0x200B, 0xD83D, 0xDC68, 0xD83C, 0xDFFC]
+ );
+
+ return ! isIdentical;
+ }
+
+ return false;
+ }
+
+ /**
+ * Adds a script to the head of the document.
+ *
+ * @ignore
+ *
+ * @since 4.2.0
+ *
+ * @param {Object} src The url where the script is located.
+ * @return {void}
+ */
+ function addScript( src ) {
+ var script = document.createElement( 'script' );
+
+ script.src = src;
+ script.defer = script.type = 'text/javascript';
+ document.getElementsByTagName( 'head' )[0].appendChild( script );
+ }
+
+ tests = Array( 'flag', 'emoji' );
+
+ settings.supports = {
+ everything: true,
+ everythingExceptFlag: true
+ };
+
+ /*
+ * Tests the browser support for flag emojis and other emojis, and adjusts the
+ * support settings accordingly.
+ */
+ for( ii = 0; ii < tests.length; ii++ ) {
+ settings.supports[ tests[ ii ] ] = browserSupportsEmoji( tests[ ii ] );
+
+ settings.supports.everything = settings.supports.everything && settings.supports[ tests[ ii ] ];
+
+ if ( 'flag' !== tests[ ii ] ) {
+ settings.supports.everythingExceptFlag = settings.supports.everythingExceptFlag && settings.supports[ tests[ ii ] ];
+ }
+ }
+
+ settings.supports.everythingExceptFlag = settings.supports.everythingExceptFlag && ! settings.supports.flag;
+
+ // Sets DOMReady to false and assigns a ready function to settings.
+ settings.DOMReady = false;
+ settings.readyCallback = function() {
+ settings.DOMReady = true;
+ };
+
+ // When the browser can not render everything we need to load a polyfill.
+ if ( ! settings.supports.everything ) {
+ ready = function() {
+ settings.readyCallback();
+ };
+
+ /*
+ * Cross-browser version of adding a dom ready event.
+ */
+ if ( document.addEventListener ) {
+ document.addEventListener( 'DOMContentLoaded', ready, false );
+ window.addEventListener( 'load', ready, false );
+ } else {
+ window.attachEvent( 'onload', ready );
+ document.attachEvent( 'onreadystatechange', function() {
+ if ( 'complete' === document.readyState ) {
+ settings.readyCallback();
+ }
+ } );
+ }
+
+ src = settings.source || {};
+
+ if ( src.concatemoji ) {
+ addScript( src.concatemoji );
+ } else if ( src.wpemoji && src.twemoji ) {
+ addScript( src.twemoji );
+ addScript( src.wpemoji );
+ }
+ }
+
+} )( window, document, window._wpemojiSettings );