( function( window, document, settings ) {
- var src, ready;
+ var src, ready, ii, tests;
/**
* Detect if the browser supports rendering emoji or flag emoji. Flag emoji are a single glyph
*
* @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 "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,
- tone;
+ tonedata, tone, tone2;
if ( ! context || ! context.fillText ) {
return false;
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 '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;
+ 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;
+
+ 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 );
- } else {
+ 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;
+ return context.getImageData( 16, 16, 1, 1 ).data[0] !== 0;
}
+
+ return false;
}
function addScript( src ) {
document.getElementsByTagName( 'head' )[0].appendChild( script );
}
+ tests = Array( 'simple', 'flag', 'unicode8', 'diversity' );
+
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();
};
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