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Edit File: wp-emoji-loader.js
( function( window, document, settings ) { var src, ready, ii, tests; /** * Detect 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 * * @param type {String} Whether to test for support of "simple", "flag", "diversity" or "unicode8" emoji. * @return {Boolean} True if the browser can render emoji, false if it cannot. */ function browserSupportsEmoji( type ) { var canvas = document.createElement( 'canvas' ), context = canvas.getContext && canvas.getContext( '2d' ), stringFromCharCode = String.fromCharCode, flag, flag2, tonedata, tone, tone2; 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': /* * This works because the image will be one of three things: * - Two empty squares, if the browser doesn't render emoji * - Two squares with 'A' and 'U' in them, if the browser doesn't render flag emoji * - The Australian flag * * The first two will encode to small images (1-2KB data URLs), the third will encode * to a larger image (4-5KB data URL). */ context.fillText( stringFromCharCode( 55356, 56806, 55356, 56826 ), 0, 0 ); if ( canvas.toDataURL().length < 3000 ) { return false; } context.clearRect( 0, 0, canvas.width, canvas.height ); /* * Test for rainbow flag compatibility. As the rainbow flag was added out of sequence with * the usual Unicode release cycle, some browsers support it, and some don't, even if their * Unicode support is up to date. * * 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 + rainbow emoji). */ context.fillText( stringFromCharCode( 55356, 57331, 65039, 8205, 55356, 57096 ), 0, 0 ); flag = canvas.toDataURL(); context.clearRect( 0, 0, canvas.width, canvas.height ); context.fillText( stringFromCharCode( 55356, 57331, 55356, 57096 ), 0, 0 ); flag2 = canvas.toDataURL(); return flag !== flag2; case 'diversity': /* * This tests if the browser supports the Emoji Diversity specification, by rendering an * emoji with no skin tone specified (in this case, Santa). It then adds a skin tone, and * compares if the emoji rendering has changed. */ context.fillText( stringFromCharCode( 55356, 57221 ), 0, 0 ); tonedata = context.getImageData( 16, 16, 1, 1 ).data; tone = tonedata[0] + ',' + tonedata[1] + ',' + tonedata[2] + ',' + tonedata[3]; context.fillText( stringFromCharCode( 55356, 57221, 55356, 57343 ), 0, 0 ); // Chrome has issues comparing arrays, and Safari has issues converting arrays to strings. // So, we create our own string and compare that, instead. tonedata = context.getImageData( 16, 16, 1, 1 ).data; tone2 = tonedata[0] + ',' + tonedata[1] + ',' + tonedata[2] + ',' + tonedata[3]; return tone !== tone2; case 'simple': /* * This creates a smiling emoji, and checks to see if there is any image data in the * center pixel. In browsers that don't support emoji, the character will be rendered * as an empty square, so the center pixel will be blank. */ context.fillText( stringFromCharCode( 55357, 56835 ), 0, 0 ); return context.getImageData( 16, 16, 1, 1 ).data[0] !== 0; case 'unicode8': /* * To check for Unicode 8 support, let's try rendering the most important advancement * that the Unicode Consortium have made in years: the burrito. */ context.fillText( stringFromCharCode( 55356, 57135 ), 0, 0 ); return context.getImageData( 16, 16, 1, 1 ).data[0] !== 0; case 'unicode9': /* * Do Unicode 9 emoji render? * ¯\_(ツ)_/¯ */ context.fillText( stringFromCharCode( 55358, 56631 ), 0, 0 ); return context.getImageData( 16, 16, 1, 1 ).data[0] !== 0; } return false; } function addScript( src ) { var script = document.createElement( 'script' ); script.src = src; script.type = 'text/javascript'; document.getElementsByTagName( 'head' )[0].appendChild( script ); } tests = Array( 'simple', 'flag', 'unicode8', 'diversity', 'unicode9' ); settings.supports = { everything: true, everythingExceptFlag: true }; 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; settings.DOMReady = false; settings.readyCallback = function() { settings.DOMReady = true; }; if ( ! settings.supports.everything ) { ready = function() { settings.readyCallback(); }; 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 );
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