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@@ -714,8 +714,11 @@
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if( data.backgroundPosition ) element.style.backgroundPosition = data.backgroundPosition;
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if( data.backgroundTransition ) element.setAttribute( 'data-background-transition', data.backgroundTransition );
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- if( data.backgroundColor ) {
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-
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+ // If this slide has a background color, add a class that
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+ // signals if it is light
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+ if( element.style.backgroundColor && colorBrightness( element.style.backgroundColor ) > 128 ) {
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+ slide.classList.add( 'is-background-light' );
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+ element.classList.add( 'is-background-light' );
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}
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container.appendChild( element );
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@@ -1122,7 +1125,11 @@
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if( typeof color === 'string' ) color = colorToRgb( color );
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- return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
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+ if( color ) {
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+ return ( color.r * 299 + color.g * 587 + color.b * 114 ) / 1000;
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+ }
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+
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+ return null;
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}
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@@ -4100,9 +4107,6 @@
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addEventListeners: addEventListeners,
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removeEventListeners: removeEventListeners,
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- colorToRgb: colorToRgb,
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- colorBrightness: colorBrightness,
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-
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// Facility for persisting and restoring the presentation state
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getState: getState,
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setState: setState,
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