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Emoji: Move a comment to match the restructure in [31779], and add an extra comment explaining how emoji rendering support is detected.

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See #31242



git-svn-id: https://develop.svn.wordpress.org/trunk@31788 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Gary Pendergast 2015-03-16 00:05:05 +00:00
parent f078bc93aa
commit ad7456fe03
1 changed files with 8 additions and 3 deletions
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11
src/wp-includes/js/wp-emoji.js
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@ -82,6 +82,11 @@
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';
@ -99,9 +104,9 @@
return canvas.toDataURL().length > 3000;
} else {
/*
* 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.
* 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( String.fromCharCode( 55357, 56835 ), 0, 0 );
return context.getImageData( 16, 16, 1, 1 ).data[0] !== 0;