2010-04-23 Simon Fraser <simon.fraser@apple.com>
Reviewed by Dan Bernstein.
ASSERT(willBeComposited == needsToBeComposited(layer)); on gmail.com
https://bugs.webkit.org/show_bug.cgi?id=38066
When a layer goes into compositing mode because it has a negative z-index child that is going
into compositing mode, then set willBeComposited to true. Also add another assertion to catch
any other cases where the state of willBeComposited is mismanaged.
Test: compositing/composited-negative-zindex-child.html
* rendering/RenderLayerCompositor.cpp:
(WebCore::RenderLayerCompositor::computeCompositingRequirements):
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@58203 268f45cc-cd09-0410-ab3c-d52691b4dbfc
diff --git a/LayoutTests/compositing/composited-negative-zindex-child.html b/LayoutTests/compositing/composited-negative-zindex-child.html
new file mode 100644
index 0000000..5805793
--- /dev/null
+++ b/LayoutTests/compositing/composited-negative-zindex-child.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+
+<html>
+<head>
+ <style type="text/css" media="screen">
+ .box {
+ height: 100px;
+ width: 100px;
+ position: absolute;
+ z-index: 0;
+ }
+
+ .parent {
+ border: 1px solid black;
+ }
+
+ .child {
+ top: 10px;
+ left: 10px;
+ background-color: silver;
+ z-index: -1;
+ }
+ </style>
+ <script type="text/javascript" charset="utf-8">
+ if (window.layoutTestController)
+ layoutTestController.dumpAsText();
+
+ function doTest() {
+ document.getElementById('child').style.webkitTransform = 'translateZ(0)';
+ }
+ window.addEventListener('load', doTest, false);
+ </script>
+</head>
+<body>
+ <p>This test should not assert in debug builds.</p>
+ <div class="parent box">
+ <div id="child" class="child box"></div>
+ </div>
+</body>
+</html>
