revamp pdf printing to support per-slide backgrounds (closes #453)

6 files changed, 77 insertions, 40 deletions

diff --git a/css/print/pdf.css b/css/print/pdf.css
index 9811096..d278865 100644
--- a/css/print/pdf.css
+++ b/css/print/pdf.css
@@ -17,8 +17,9 @@
 
 body {
 	font-size: 18pt;
-	width: auto;
-	height: auto;
+	width: 297mm;
+	height: 229mm;
+	margin: 0 auto !important;
 	border: 0;
 	padding: 0;
 	float: none !important;
@@ -88,10 +89,8 @@ ul, ol, div, p {
 
 	left: auto;
 	top: auto;
-	margin-left: auto;
-	margin-right: auto;
-	margin-top: auto;
-	padding: auto;
+	margin: 0 !important;
+	padding: 0 !important;
 
 	overflow: visible;
 	display: block;
@@ -113,18 +112,18 @@ ul, ol, div, p {
 	page-break-after: always !important;
 
 	visibility: visible !important;
-	position: static !important;
+	position: relative !important;
 	width: 100% !important;
-	height: auto !important;
-	min-height: initial !important;
+	height: 229mm !important;
+	min-height: 229mm !important;
 	display: block !important;
-	overflow: visible !important;
+	overflow: hidden !important;
 
 	left: 0 !important;
 	top: 0 !important;
-	margin-left: 0px !important;
-	margin-top: 50px !important;
-	padding: 20px 0px !important;
+	margin: 0 !important;
+	padding: 2cm 1cm 0 1cm !important;
+	box-sizing: border-box !important;
 
 	opacity: 1 !important;
 
@@ -139,9 +138,11 @@ ul, ol, div, p {
 	        transform: none !important;
 }
 .reveal section.stack {
-	margin: 0px !important;
-	padding: 0px !important;
+	margin: 0 !important;
+	padding: 0 !important;
 	page-break-after: avoid !important;
+	height: auto !important;
+	min-height: auto !important;
 }
 .reveal section .fragment {
 	opacity: 1 !important;
@@ -152,6 +153,17 @@ ul, ol, div, p {
 	    -ms-transform: none !important;
 	        transform: none !important;
 }
+.reveal section .slide-background {
+	position: absolute;
+	top: 0;
+	left: 0;
+	width: 100%;
+	z-index: 0;
+}
+.reveal section>* {
+	position: relative;
+	z-index: 1;
+}
 .reveal img {
 	box-shadow: none;
 }
diff --git a/css/reveal.css b/css/reveal.css
index 1f0b1f8..b878b91 100644
--- a/css/reveal.css
+++ b/css/reveal.css
@@ -1309,7 +1309,7 @@ body {
 	width: 100%;
 	height: 100%;
 }
-	.reveal>.background div {
+	.reveal .slide-background {
 		position: absolute;
 		width: 100%;
 		height: 100%;
@@ -1327,13 +1327,18 @@ body {
 		     -o-transition: all 650ms ease;
 		        transition: all 650ms ease;
 	}
-	.reveal>.background div.present {
+	.reveal .slide-background.present {
 		opacity: 1;
 		visibility: visible;
 	}
 
+	.print-pdf .reveal .slide-background {
+		opacity: 1 !important;
+		visibility: visible !important;
+	}
+
 /* Linear sliding transition style */
-.reveal[data-background-transition=linear]>.background div {
+.reveal[data-background-transition=linear]>.background .slide-background {
 	opacity: 1;
 
 	-webkit-backface-visibility: hidden;
@@ -1341,14 +1346,14 @@ body {
 	    -ms-backface-visibility: hidden;
 	        backface-visibility: hidden;
 }
-	.reveal[data-background-transition=linear]>.background div.past {
+	.reveal[data-background-transition=linear]>.background .slide-background.past {
 		-webkit-transform: translate(-100%, 0);
 		   -moz-transform: translate(-100%, 0);
 		    -ms-transform: translate(-100%, 0);
 		     -o-transform: translate(-100%, 0);
 		        transform: translate(-100%, 0);
 	}
-	.reveal[data-background-transition=linear]>.background div.future {
+	.reveal[data-background-transition=linear]>.background .slide-background.future {
 		-webkit-transform: translate(100%, 0);
 		   -moz-transform: translate(100%, 0);
 		    -ms-transform: translate(100%, 0);
@@ -1356,14 +1361,14 @@ body {
 		        transform: translate(100%, 0);
 	}
 
-	.reveal[data-background-transition=linear]>.background div>div.past {
+	.reveal[data-background-transition=linear]>.background .slide-background>.slide-background.past {
 		-webkit-transform: translate(0, -100%);
 		   -moz-transform: translate(0, -100%);
 		    -ms-transform: translate(0, -100%);
 		     -o-transform: translate(0, -100%);
 		        transform: translate(0, -100%);
 	}
-	.reveal[data-background-transition=linear]>.background div>div.future {
+	.reveal[data-background-transition=linear]>.background .slide-background>.slide-background.future {
 		-webkit-transform: translate(0, 100%);
 		   -moz-transform: translate(0, 100%);
 		    -ms-transform: translate(0, 100%);
@@ -1373,13 +1378,13 @@ body {
 
 
 /* Global transition speed settings */
-.reveal[data-transition-speed="fast"]>.background div {
+.reveal[data-transition-speed="fast"]>.background .slide-background {
 	-webkit-transition-duration: 300ms;
 	   -moz-transition-duration: 300ms;
 	    -ms-transition-duration: 300ms;
 	        transition-duration: 300ms;
 }
-.reveal[data-transition-speed="slow"]>.background div {
+.reveal[data-transition-speed="slow"]>.background .slide-background {
 	-webkit-transition-duration: 900ms;
 	   -moz-transition-duration: 900ms;
 	    -ms-transition-duration: 900ms;
diff --git a/css/reveal.min.css b/css/reveal.min.css
index 2f5f914..90620d7 100644
--- a/css/reveal.min.css
+++ b/css/reveal.min.css
@@ -4,4 +4,4 @@
  * MIT licensed
  *
  * Copyright (C) 2013 Hakim El Hattab, http://hakim.se
- */ html,body,.reveal div,.reveal span,.reveal applet,.reveal object,.reveal iframe,.reveal h1,.reveal h2,.reveal h3,.reveal h4,.reveal h5,.reveal h6,.reveal p,.reveal blockquote,.reveal pre,.reveal a,.reveal abbr,.reveal acronym,.reveal address,.reveal big,.reveal cite,.reveal code,.reveal del,.reveal dfn,.reveal em,.reveal img,.reveal ins,.reveal kbd,.reveal q,.reveal s,.reveal samp,.reveal small,.reveal strike,.reveal strong,.reveal sub,.reveal sup,.reveal tt,.reveal var,.reveal b,.reveal u,.reveal i,.reveal center,.reveal dl,.reveal dt,.reveal dd,.reveal ol,.reveal ul,.reveal li,.reveal fieldset,.reveal form,.reveal label,.reveal legend,.reveal table,.reveal caption,.reveal tbody,.reveal tfoot,.reveal thead,.reveal tr,.reveal th,.reveal td,.reveal article,.reveal aside,.reveal canvas,.reveal details,.reveal embed,.reveal figure,.reveal figcaption,.reveal footer,.reveal header,.reveal hgroup,.reveal menu,.reveal nav,.reveal output,.reveal ruby,.reveal section,.reveal summary,.reveal time,.reveal mark,.reveal audio,video{margin:0;padding:0;border:0;font-size:100%;font:inherit;vertical-align:baseline}.reveal article,.reveal aside,.reveal details,.reveal figcaption,.reveal figure,.reveal footer,.reveal header,.reveal hgroup,.reveal menu,.reveal nav,.reveal section{display:block}html,body{width:100%;height:100%;overflow:hidden}body{position:relative;line-height:1}::selection{background:#FF5E99;color:#fff;text-shadow:none}.reveal h1,.reveal h2,.reveal h3,.reveal h4,.reveal h5,.reveal h6{-webkit-hyphens:auto;-moz-hyphens:auto;hyphens:auto;word-wrap:break-word}.reveal h1{font-size:3.77em}.reveal h2{font-size:2.11em}.reveal h3{font-size:1.55em}.reveal h4{font-size:1em}.reveal .slides section .fragment{opacity:0;-webkit-transition:all .2s ease;-moz-transition:all .2s ease;-ms-transition:all .2s ease;-o-transition:all .2s ease;transition:all .2s ease}.reveal .slides section .fragment.visible{opacity:1}.reveal .slides section .fragment.grow{opacity:1}.reveal 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\ No newline at end of file
diff --git a/index.html b/index.html
index 982cfec..aa4913f 100644
--- a/index.html
+++ b/index.html
@@ -201,19 +201,13 @@
 							<img width="178" height="238" src="https://s3.amazonaws.com/hakim-static/reveal-js/arrow.png" alt="Down arrow">
 						</a>
 					</section>
-					<section data-background="https://s3.amazonaws.com/hakim-static/reveal-js/cornify.gif">
+					<section data-background="https://s3.amazonaws.com/hakim-static/reveal-js/arrow.png">
 						<h2>Image Backgrounds</h2>
 						<pre><code>&lt;section data-background="image.png"&gt;</code></pre>
-						<a href="#" class="image navigate-down">
-							<img width="178" height="238" src="https://s3.amazonaws.com/hakim-static/reveal-js/arrow.png" alt="Down arrow">
-						</a>
 					</section>
-					<section data-background="https://s3.amazonaws.com/hakim-static/reveal-js/cornify.gif" data-background-repeat="repeat" data-background-size="100px">
+					<section data-background="https://s3.amazonaws.com/hakim-static/reveal-js/arrow.png" data-background-repeat="repeat" data-background-size="100px">
 						<h2>Repeated Image Backgrounds</h2>
 						<pre><code style="word-wrap: break-word;">&lt;section data-background="image.png" data-background-repeat="repeat" data-background-size="100px"&gt;</code></pre>
-						<a href="#" class="image navigate-next">
-							<img width="178" height="238" src="https://s3.amazonaws.com/hakim-static/reveal-js/arrow.png" alt="Up arrow" style="-webkit-transform: rotate(-90deg);">
-						</a>
 					</section>
 				</section>
 
diff --git a/js/reveal.js b/js/reveal.js
index 5ac219e..73eddeb 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -254,6 +254,10 @@ var Reveal = (function(){
 	 */
 	function createBackgrounds() {
 
+		if( isPrintingPDF() ) {
+			document.body.classList.add( 'print-pdf' );
+		}
+
 		// Clear prior backgrounds
 		dom.background.innerHTML = '';
 		dom.background.classList.add( 'no-transition' );
@@ -271,6 +275,7 @@ var Reveal = (function(){
 			};
 
 			var element = document.createElement( 'div' );
+			element.className = 'slide-background';
 
 			if( data.background ) {
 				// Auto-wrap image urls in url(...)
@@ -297,12 +302,24 @@ var Reveal = (function(){
 		// Iterate over all horizontal slides
 		toArray( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) ).forEach( function( slideh ) {
 
-			var backgroundStack = _createBackground( slideh, dom.background );
+			var backgroundStack;
+
+			if( isPrintingPDF() ) {
+				backgroundStack = _createBackground( slideh, slideh );
+			}
+			else {
+				backgroundStack = _createBackground( slideh, dom.background );
+			}
 
 			// Iterate over all vertical slides
 			toArray( slideh.querySelectorAll( 'section' ) ).forEach( function( slidev ) {
 
-				_createBackground( slidev, backgroundStack );
+				if( isPrintingPDF() ) {
+					_createBackground( slidev, slidev );
+				}
+				else {
+					_createBackground( slidev, backgroundStack );
+				}
 
 			} );
 
@@ -598,6 +615,15 @@ var Reveal = (function(){
 	}
 
 	/**
+	 * Checks if this instance is being used to print a PDF.
+	 */
+	function isPrintingPDF() {
+
+		return ( /print-pdf/gi ).test( window.location.search );
+
+	}
+
+	/**
 	 * Causes the address bar to hide on mobile devices,
 	 * more vertical space ftw.
 	 */
@@ -713,7 +739,7 @@ var Reveal = (function(){
 	 */
 	function layout() {
 
-		if( dom.wrapper ) {
+		if( dom.wrapper && !isPrintingPDF() ) {
 
 			// Available space to scale within
 			var availableWidth = dom.wrapper.offsetWidth,
@@ -1491,11 +1517,11 @@ var Reveal = (function(){
 		// states of their slides (past/present/future)
 		toArray( dom.background.childNodes ).forEach( function( backgroundh, h ) {
 
-			backgroundh.className = ( h < indexh ? 'past' : h > indexh ? 'future' : 'present' );
+			backgroundh.className = 'slide-background ' + ( h < indexh ? 'past' : h > indexh ? 'future' : 'present' );
 
 			toArray( backgroundh.childNodes ).forEach( function( backgroundv, v ) {
 
-				backgroundv.className = ( v < indexv ? 'past' : v > indexv ? 'future' : 'present' );
+				backgroundv.className = 'slide-background ' + ( v < indexv ? 'past' : v > indexv ? 'future' : 'present' );
 
 			} );
 
diff --git a/js/reveal.min.js b/js/reveal.min.js
index aa2cf31..1769f69 100644
--- a/js/reveal.min.js
+++ b/js/reveal.min.js
@@ -1,8 +1,8 @@
 /*!
- * reveal.js 2.5.0 (2013-06-04, 20:58)
+ * reveal.js 2.5.0 (2013-06-07, 17:32)
  * http://lab.hakim.se/reveal-js
  * MIT licensed
  *
  * Copyright (C) 2013 Hakim El Hattab, http://hakim.se
  */
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class="navigate-down"></div>',Mt.wrapper.appendChild(t)}if(!Mt.wrapper.querySelector(".state-background")){var n=document.createElement("div");n.classList.add("state-background"),Mt.wrapper.appendChild(n)}if(!Mt.wrapper.querySelector(".pause-overlay")){var r=document.createElement("div");r.classList.add("pause-overlay"),Mt.wrapper.appendChild(r)}Mt.progress=document.querySelector(".reveal .progress"),Mt.progressbar=document.querySelector(".reveal .progress span"),St.controls&&(Mt.controls=document.querySelector(".reveal .controls"),Mt.controlsLeft=d(document.querySelectorAll(".navigate-left")),Mt.controlsRight=d(document.querySelectorAll(".navigate-right")),Mt.controlsUp=d(document.querySelectorAll(".navigate-up")),Mt.controlsDown=d(document.querySelectorAll(".navigate-down")),Mt.controlsPrev=d(document.querySelectorAll(".navigate-prev")),Mt.controlsNext=d(document.querySelectorAll(".navigate-next")))}function n(){function e(e,t){var n={background:e.getAttribute("data-background"),backgroundSize:e.getAttribute("data-background-size"),backgroundColor:e.getAttribute("data-background-color"),backgroundRepeat:e.getAttribute("data-background-repeat"),backgroundPosition:e.getAttribute("data-background-position")},r=document.createElement("div");return n.background&&(/\.(png|jpg|jpeg|gif|bmp)$/gi.test(n.background)?r.style.backgroundImage="url("+n.background+")":r.style.background=n.background),n.backgroundSize&&(r.style.backgroundSize=n.backgroundSize),n.backgroundColor&&(r.style.backgroundColor=n.backgroundColor),n.backgroundRepeat&&(r.style.backgroundRepeat=n.backgroundRepeat),n.backgroundPosition&&(r.style.backgroundPosition=n.backgroundPosition),t.appendChild(r),r}Mt.background.innerHTML="",Mt.background.classList.add("no-transition"),d(document.querySelectorAll(Lt)).forEach(function(t){var n=e(t,Mt.background);d(t.querySelectorAll("section")).forEach(function(t){e(t,n)})})}function 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