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add is-background-light class to slides/backgrounds that are > 128 brightness

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This commit is contained in:
Hakim El Hattab 2014-09-09 16:50:23 +02:00
parent 8a50a46665
commit 20e72df4bf
1 changed files with 10 additions and 6 deletions
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16
js/reveal.js
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@ -714,8 +714,11 @@
if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
if( data.backgroundColor ) {
// 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 ) {
slide.classList.add( 'is-background-light' );
element.classList.add( 'is-background-light' );
}
container.appendChild( element );
@ -1122,7 +1125,11 @@
if( typeof color === 'string' ) color = colorToRgb( color );
return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
if( color ) {
return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
}
return null;
}
@ -4100,9 +4107,6 @@
addEventListeners: addEventListeners,
removeEventListeners: removeEventListeners,
colorToRgb: colorToRgb,
colorBrightness: colorBrightness,
// Facility for persisting and restoring the presentation state
getState: getState,
setState: setState,