bt: display commentary

Signed-off-by: Sean Cross <sean@xobs.io>

css/theme/lca2020.css

@@ -24,6 +24,19 @@ body {
     background-color: #fff;
 }
 
+.reveal .commentary {
+    bottom: 100px;
+    right: 0em;
+    padding-bottom: 1em;
+    padding-right: 1em;
+    position: absolute;
+    background-color: rgba(0,0,0, 0.50);
+    font-size: 16pt;
+    font-family: serif;
+    z-index: 10;
+    color: white;
+}
+
 .reveal .footer {
     position: absolute;
     bottom: 0em;

index.html

@@ -84,10 +84,17 @@
             <span class="theme">Who’s Watching</span><span class="hashtag"> | #LCA2020</span><span class="twitter"> |
                 @linuxconfau</span>
         </div>
+        <div class="commentary"></div>
         <div class="slides">
             <section data-background-image="css/theme/lca2019-title-bg-transparent.svg">
                 <h2 style="background-color: transparent;">Betrusted: Being Secure</h2>
                 <h5 style="background-color: transparent;">That's no Blackberry, it's a chat client!</h5>
+                <p align="right">
+                    <small>bunnie - <a href="https://bunniestudios.com/">https://bunniestudios.com/</a> - @bunnievorpal</small>
+                </p>
+                <p align="right">
+                    <small>Tom Marble - <a href="https://info9.net/wiki/tmarble/">https://info9.net/wiki/tmarble/</a></small>
+                </p>
                 <p align="right">
                     <small>Sean Cross - <a href="https://xobs.io/">https://xobs.io/</a> - @xobs</small>
                 </p>
@@ -105,6 +112,12 @@
 
                 <section>
                     <h2>Betrusted Goals</h2>
+                    <ul>
+                        <li>&lt;=4 MB RAM</li>
+                        <li>Process Isolation</li>
+                        <li>Safe language</li>
+                        <li class="fragment">Microkernel</li>
+                    </ul>
                     <aside class="notes">
                         With Betrusted, we wanted to reduce the code footprint.  This will allow
                         us to run with less RAM -- ideally 4 MB or less.  We also wanted to have
@@ -186,9 +199,28 @@
                         have keepout areas of the screen and add IMEs to the input, which
                         would quickly introduce incompatibility with Redox.
 
+                        Finally, we would like to be able to use stable Rust for our applications,
+                        which we can almost do with Xous.  We're just waiting for either the
+                        "alloc_error_handler" attribute to be stabilized (issue 66740), or
+                        defaulting handle_alloc_error to panic (issue 66741), which would give
+                        us everything we'd need to use alloc on stable Rust.
+
                         In short, Tock is too small, and Redox is too big.
                     </aside>
                 </section>
+
+                <section>
+                    <h2>Other Alternatives and Inspirations</h2>
+                    <aside class="notes">
+                        There are many alternative operating systems.  We can draw inspiration
+                        from them, even if we don't use them directly.
+
+                        For example, both the QNX microkernel and Solaris Doors implementation
+                        allow for one process to pass a message to another, which then inherits
+                        its remaining quantum and runlevel.  This prevents priority inversions
+                        and makes syscalls relatively cheap.
+                    </aside>
+                </section>
             </section>
 
         </div>
@@ -207,7 +239,7 @@
             controls: presenter ? false : true,
             progress: true,
             history: true,
-            center: true,
+            center: false,
             controlsTutorial: presenter ? false : true,
 
             slideNumber: presenter ? null : 'c/t',
@@ -215,7 +247,7 @@
             // The "normal" size of the presentation, aspect ratio will be preserved
             // when the presentation is scaled to fit different resolutions. Can be
             // specified using percentage units.
-            width: "100%",
+            width: 960,
             height: 700,
 
             // Factor of the display size that should remain empty around the content
@@ -251,6 +283,22 @@
                 },
             ]
         });
+
+        Reveal.addEventListener( 'slidechanged', function( event ) {
+            // event.previousSlide, event.currentSlide, event.indexh, event.indexv
+            var commentaries = document.getElementsByClassName("commentary");
+            Array.prototype.forEach.call(commentaries, cmt => {
+                cmt.innerHTML = "";
+            });
+            // debugger;
+            event.currentSlide.childNodes.forEach(element => {
+                if ((element.nodeName == "ASIDE") && (element.className == "notes")) {
+                    Array.prototype.forEach.call(commentaries, cmt => {
+                        cmt.innerHTML = "<p>" + element.innerHTML.replace("\n\n", "</p><p>") + "</p>";
+                    });
+                }
+            });
+        } );
     </script>
 </body>