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use computed style when calculating bg birghtness

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This commit is contained in:
Hakim El Hattab
2014-09-09 17:18:15 +02:00
parent 20e72df4bf
commit 9fb0c5f3d3
2 changed files with 21 additions and 7 deletions
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7
js/reveal.js
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@ -714,15 +714,16 @@
if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
container.appendChild( element );
// If this slide has a background color, add a class that
// signals if it is light
if( element.style.backgroundColor && colorBrightness( element.style.backgroundColor ) > 128 ) {
var computedBackgroundColor = window.getComputedStyle( element ).backgroundColor;
if( computedBackgroundColor && colorBrightness( computedBackgroundColor ) > 128 ) {
slide.classList.add( 'is-background-light' );
element.classList.add( 'is-background-light' );
}
container.appendChild( element );
return element;
}