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<!DOCTYPE html>
<html>
<head>
<style>
div {
position: absolute;
z-index: 1;
width: 100px;
height: 100px;
}
.composited {
-webkit-transform: translatez(0);
top: 60px;
left: 60px;
width: 400px;
height: 400px;
background-color: gray;
}
.overlap1 {
top: 140px;
left: 140px;
background-color: blue;
}
.overlap2 {
top: 220px;
left: 220px;
background-color: lime;
}
.overlap3 {
top: 300px;
left: 300px;
background-color: magenta;
}
div:hover {
background-color: green;
}
.green {
background-color: green;
}
#C {
display: none;
}
#testResults {
display: none;
}
</style>
<script>
if (window.testRunner)
testRunner.dumpAsText();
var isInteractive = true;
if (window.internals) {
internals.settings.setLayerSquashingEnabled(true);
isInteractive = false;
}
function resetLayers()
{
document.getElementById("A").style.display = "block";
document.getElementById("B").style.display = "block";
document.getElementById("C").style.display = "none";
if (isInteractive) {
document.removeEventListener("click", resetLayers);
document.addEventListener("click", addOverlap3);
}
}
function addOverlap2()
{
document.getElementById("B").style.display = "block";
if (isInteractive) {
document.removeEventListener("click", addOverlap2);
document.addEventListener("click", resetLayers);
}
}
function removeOverlap1()
{
document.getElementById("A").style.display = "none";
if (isInteractive) {
document.removeEventListener("click", removeOverlap1);
document.addEventListener("click", addOverlap2);
}
}
function removeOverlap2()
{
document.getElementById("B").style.display = "none";
if (isInteractive) {
document.removeEventListener("click", removeOverlap2);
document.addEventListener("click", removeOverlap1);
}
}
function addOverlap3()
{
document.getElementById("C").style.display = "block";
if (isInteractive) {
document.removeEventListener("click", addOverlap3);
document.addEventListener("click", removeOverlap2);
}
}
document.addEventListener("click", addOverlap3);
function runTest()
{
if (!window.internals)
return;
// Case 1
document.getElementById('Case1').textContent = window.internals.layerTreeAsText(document);
// Case 2
window.internals.startTrackingRepaints(document);
addOverlap3();
document.getElementById('Case2').textContent = window.internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_REPAINT_RECTS);
window.internals.stopTrackingRepaints(document);
// Case 3
window.internals.startTrackingRepaints(document);
removeOverlap2();
document.getElementById('Case3').textContent = window.internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_REPAINT_RECTS);
window.internals.stopTrackingRepaints(document);
// Case 4
window.internals.startTrackingRepaints(document);
removeOverlap1();
document.getElementById('Case4').textContent = window.internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_REPAINT_RECTS);
window.internals.stopTrackingRepaints(document);
// Case 5
window.internals.startTrackingRepaints(document);
addOverlap2();
document.getElementById('Case5').textContent = window.internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_REPAINT_RECTS);
window.internals.stopTrackingRepaints(document);
// Case 6
window.internals.startTrackingRepaints(document);
resetLayers();
document.getElementById('Case6').textContent = window.internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_REPAINT_RECTS);
window.internals.stopTrackingRepaints(document);
// Display the test results only after test is done so that it does not affect repaint rect results.
document.getElementById('testResults').style.display = "block";
}
</script>
</head>
<body onload="runTest()">
<p>Test that layers can be nicely added or removed from a squashed layer, without unnecessary repaints on any layer.
Click anywhere to test interactively; keep clicking to proceed through the test.</p>
<div class="composited"></div>
<div id="A" class="overlap1"></div>
<div id="B" class="overlap2"></div>
<div id="C" class="overlap3"></div>
<div id="testResults">
CASE 1, original layer tree with overlap1 and overlap2:
<pre id="Case1"></pre>
CASE 2, overlap3 gets added:
<pre id="Case2"></pre>
CASE 3, overlap2 gets removed. Since this does not resize the layer, there should only be a repaint of overlap2:
<pre id="Case3"></pre>
CASE 4, overlap1 gets removed:
<pre id="Case4"></pre>
CASE 5, overlap2 gets added back:
<pre id="Case5"></pre>
CASE 6, overlap1 gets added back, and overlap3 gets removed:
<pre id="Case6"></pre>
</div>
</body>
</html>
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