squashed-layer-loses-graphicslayer.html

<!DOCTYPE html>
<html>
<head>
<script src="../../resources/run-after-layout-and-paint.js"></script>
<style>
div {
  position: absolute;
  z-index: 1;
  width: 100px;
  height: 100px;
}

.composited {
  will-change: transform;
}

.underneath {
  top: 60px;
  left: 60px;
  background-color: gray;
}

.overlap1 {
  top: 140px;
  left: 140px;
  background-color: blue;
}

.overlap2 {
  top: 160px;
  left: 160px;
  background-color: lime;
}

.overlap3 {
  top: 180px;
  left: 180px;
  background-color: magenta;
}

div:hover {
  background-color: green;
  transform: none;
}

.green {
  background-color: green;
}

#testResults {
  display: none;
}

</style>
<script>
    if (window.testRunner) {
        testRunner.dumpAsText();
        testRunner.waitUntilDone();
    }

    function runTest()
    {
        if (!window.internals)
            return;
        runAfterLayoutAndPaint(executeTestCases);
    }

    function executeTestCases()
    {
        // Case 1
        document.getElementById('Case1').textContent = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_INVALIDATIONS);

        // Case 2
        internals.startTrackingRepaints(document);
        document.getElementById("forceComposited").className = "underneath";
        document.getElementById('Case2').textContent = internals.layerTreeAsText(document, internals.LAYER_TREE_INCLUDES_INVALIDATIONS);
        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";

        if (window.testRunner)
            testRunner.notifyDone();
    }
</script>
</head>

<body onload="runTest()">

  <p>A squashing Layer that becomes non-composited should correctly send
     a repaint invalidation to the new container GraphicsLayer that it paints
     into. When run interactively, hovering over the force-composited gray div
     should not cause other layers to disappear.</p>

  <div id="forceComposited" class="composited underneath"></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:
    <pre id="Case1"></pre>

    CASE 2, The original composited layer is no longer composited, which then also removes all squashing layers. The important point is that there should be an appropriate repaint to the root GraphicsLayer:
    <pre id="Case2"></pre>

  </div>

</body>

</html>
chromium/third_party/blink/web_tests/compositing/squashing/squashed-layer-loses-graphicslayer.html
