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dl-test.html
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dl-test.html
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<html>
<head>
<style>
div {
display: inline-block;
}
.square {
width:10px;
height:10px;
background-color:green;
}
.wrapper {
display: inline;
position: relative;
z-index: 0;
}
body {
overflow: hidden;
}
.active {
transform: translate3d(1px, 1px, 1px);
}
.inactive {
transform: translate(1px);
}
.flattened {
opacity: 0.95;
}
</style>
</head>
<body id="body">
displaylist_mutate
</body>
<script>
function parseArgs() {
var query = window.location.search.substring(1);
var split = query.split("&");
var args = {}
for (var i = 0; i < split.length; i++) {
var pair = split[i].split("=");
var key = pair[0];
var value = true;
if (pair.length >= 2) {
value = pair[1];
}
args[key] = value;
}
return args;
}
var gArgs = null;
function arg(key, defaultVal) {
if (gArgs === null) {
gArgs = parseArgs();
}
if (!(key in gArgs))
return defaultVal;
return gArgs[key];
}
/**
* count=<number>
*
* Specify the number of rects to create, defaults
* to 1000.
*/
var divCount = arg("count", 10000);
/**
* layer=active|inactive|flattened|none
*
* Specifies what type of Layer to create around each rects.
* active and inactive create a transform, with active using 3d
* to force an active layer.
* flattened creates an opacity, which gecko will flatten away.
* Default is none, which creates no layers.
*/
var layerType = arg("layer", "none");
/**
* modify=all|one|iterate|offscreen
*
* Specifies which rect to modify each frame.
* all modifies all rectangles, one modifies only the first.
* iterate (the default) modifies a successive rect each frame.
*/
var modify = arg("modify", "iterate");
/**
* rebuild
*
* Forces a full display item rebuild each frame (disables
* retained-dl) by triggering a no-op style change on the
* body element.
*/
var rebuild = arg("rebuild", false);
/**
* siblings
*
* Max number of siblings for each group of rectangles
* before we wrap them in a container element.
*/
var siblings = arg("siblings", 0);
var depth = (siblings == 0) ? 1 : Math.pow(divCount, 1/siblings);
var created = 0;
function createNodes(depth) {
var elem = document.createElement("div");
if (depth == 0) {
elem.id = created++;
elem.className = "square " + layerType;
return elem;
} else {
elem.className = "wrapper";
}
for (var i = 0; i < ((siblings == 0) ? divCount : siblings); i++) {
if (created == divCount) {
return elem;
}
elem.appendChild(createNodes(depth - 1));
}
return elem;
}
document.getElementById("body").appendChild(createNodes(Math.floor(depth)));
if (modify == "offscreen") {
var div = document.createElement("div");
div.id = "offscreen";
div.className = layerType;
div.style.display = "block";
div.style.position = "absolute";
div.style.top = "2000px";
document.getElementById("body").appendChild(div);
}
function toggleSquare(index) {
if (document.getElementById(index).style.backgroundColor == "red") {
document.getElementById(index).style.backgroundColor = "green";
} else {
document.getElementById(index).style.backgroundColor = "red";
}
}
var iteration = 0;
function runFrame() {
if (modify == "all") {
for (var i = 0; i < divCount; i++) {
toggleSquare(i);
}
} else if (modify == "offscreen") {
toggleSquare("offscreen");
} else {
toggleSquare(iteration);
if (modify == "iterate") {
iteration++;
iteration = iteration % divCount;
}
}
if (rebuild) {
if (document.body.style.left == "1px") {
document.body.style.left = "2px";
} else {
document.body.style.left = "1px";
}
}
window.requestAnimationFrame(runFrame);
}
window.requestAnimationFrame(runFrame);
</script>
</html>