X-Git-Url: https://scripts.mit.edu/gitweb/autoinstalls/wordpress.git/blobdiff_plain/0459461f9ea42e0b090759ff6fe5f48360bef750..16e7b37c7914d753890c1a05a9335f3b43751eb8:/wp-includes/js/wp-emoji-loader.js diff --git a/wp-includes/js/wp-emoji-loader.js b/wp-includes/js/wp-emoji-loader.js index 83f431cc..0b474f83 100644 --- a/wp-includes/js/wp-emoji-loader.js +++ b/wp-includes/js/wp-emoji-loader.js @@ -1,5 +1,12 @@ ( function( window, document, settings ) { - var src, ready; + 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' ); /** * Detect if the browser supports rendering emoji or flag emoji. Flag emoji are a single glyph @@ -7,19 +14,20 @@ * * @since 4.2.0 * - * @param type {String} Whether to test for support of "simple" or "flag" emoji. + * @param type {String} Whether to test for support of "flag" or "emoji4" 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, - tone; + var stringFromCharCode = String.fromCharCode, + flag, flag2, technologist, technologist2; if ( ! context || ! context.fillText ) { return false; } + // Cleanup from previous test. + context.clearRect( 0, 0, canvas.width, canvas.height ); + /* * 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 @@ -28,69 +36,96 @@ context.textBaseline = 'top'; context.font = '600 32px Arial'; - if ( 'flag' === type ) { - /* - * 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 ); - return canvas.toDataURL().length > 3000; - } else if ( 'diversity' === type ) { - /* - * 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 ); - tone = context.getImageData( 16, 16, 1, 1 ).data.toString(); - context.fillText( stringFromCharCode( 55356, 57221, 55356, 57343 ), 0, 0 ); - // Chrome has issues comparing arrays, so we compare it as a string, instead. - return tone !== context.getImageData( 16, 16, 1, 1 ).data.toString(); - } else { - if ( 'simple' === type ) { + 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 'U' and 'N' in them, if the browser doesn't render flag emoji + * - The United Nations 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, 56826, 55356, 56819 ), 0, 0 ); + if ( canvas.toDataURL().length < 3000 ) { + return false; + } + + context.clearRect( 0, 0, canvas.width, canvas.height ); + /* - * 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. + * 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( 55357, 56835 ), 0, 0 ); - } else { + 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 'emoji4': /* - * To check for Unicode 8 support, let's try rendering the most important advancement - * that the Unicode Consortium have made in years: the burrito. + * Emoji 4 has the best technologists. So does WordPress! + * + * To test for support, try to render a new emoji (woman technologist: medium skin tone), + * then compare it to how it would look if the browser doesn't render it correctly + * (woman technologist: medium skin tone + personal computer). */ - context.fillText( stringFromCharCode( 55356, 57135 ), 0, 0 ); - } - return context.getImageData( 16, 16, 1, 1 ).data[0] !== 0; + context.fillText( stringFromCharCode( 55357, 56425, 55356, 57341, 8205, 55357, 56507), 0, 0 ); + technologist = canvas.toDataURL(); + + context.clearRect( 0, 0, canvas.width, canvas.height ); + + context.fillText( stringFromCharCode( 55357, 56425, 55356, 57341, 55357, 56507), 0, 0 ); + technologist2 = canvas.toDataURL(); + + return technologist !== technologist2; } + + return false; } function addScript( src ) { var script = document.createElement( 'script' ); script.src = src; - script.type = 'text/javascript'; + script.defer = script.type = 'text/javascript'; document.getElementsByTagName( 'head' )[0].appendChild( script ); } + tests = Array( 'flag', 'emoji4' ); + settings.supports = { - simple: browserSupportsEmoji( 'simple' ), - flag: browserSupportsEmoji( 'flag' ), - unicode8: browserSupportsEmoji( 'unicode8' ), - diversity: browserSupportsEmoji( 'diversity' ) + 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.simple || ! settings.supports.flag || ! settings.supports.unicode8 || ! settings.supports.diversity ) { + if ( ! settings.supports.everything ) { ready = function() { settings.readyCallback(); };