Bug 54575 – Assertion failure in DrawingAreaImpl::display when calling WKPageForceRepaint on a page that uses accelerated compositing

• Component: Layout and Rendering
• Status: RESOLVED FIXED

[Adam Roben (:aroben)]

If you call WKPageForceRepaint on a page that uses accelerated compositing, the web process fails an assertion in DrawingAreaImpl::display:


ASSERTION FAILED: !m_layerTreeHost
/Volumes/Data/Users/aroben/dev/WebKit/OpenSource/Source/WebKit2/WebProcess/WebPage/DrawingAreaImpl.cpp(356) : void WebKit::DrawingAreaImpl::display()
 -> WebKit::DrawingAreaImpl::display()
 -> WebKit::DrawingAreaImpl::forceRepaint()
 -> WebKit::WebPage::forceRepaint(unsigned long long)
 -> void CoreIPC::callMemberFunction<WebKit::WebPage, void (WebKit::WebPage::*)(unsigned long long), unsigned long long>(CoreIPC::Arguments1<unsigned long long> const&, WebKit::WebPage*, void (WebKit::WebPage::*)(unsigned long long))
 -> void CoreIPC::handleMessage<Messages::WebPage::ForceRepaint, WebKit::WebPage, void (WebKit::WebPage::*)(unsigned long long)>(CoreIPC::ArgumentDecoder*, WebKit::WebPage*, void (WebKit::WebPage::*)(unsigned long long))
 -> WebKit::WebPage::didReceiveWebPageMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*)
 -> WebKit::WebPage::didReceiveMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*)
 -> WebKit::WebProcess::didReceiveMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*)
 -> CoreIPC::Connection::dispatchMessage(CoreIPC::Connection::Message<CoreIPC::ArgumentDecoder>&)
 -> CoreIPC::Connection::dispatchMessages()
 -> MemberFunctionWorkItem0<CoreIPC::Connection>::execute()
 -> RunLoop::performWork()
 -> RunLoop::performWork(void*)
 -> __CFRunLoopDoSources0
 -> __CFRunLoopRun
 -> CFRunLoopRunSpecific
 -> RunCurrentEventLoopInMode
 -> ReceiveNextEventCommon
 -> BlockUntilNextEventMatchingListInMode
 -> _DPSNextEvent
 -> -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:]
 -> -[NSApplication run]
 -> RunLoop::run()
 -> WebKit::WebProcessMain(WebKit::CommandLine const&)
 -> _ZL10WebKitMainRKN6WebKit11CommandLineE
 -> WebKitMain
 -> main
 -> start
 -> 0x6

[Adam Roben (:aroben)]

<rdar://problem/8979594>

[Anders Carlsson]

Created attachment 82673 [details]
Patch

[Adam Roben (:aroben)]

Comment on attachment 82673 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=82673&action=review

Please add a test case.

> Source/WebKit2/WebProcess/WebPage/DrawingAreaImpl.cpp:149
> +    if (m_layerTreeHost) {
> +        m_layerTreeHost->forceRepaint();
> +
> +        return;
> +    }

I don't think you need the extra blank line in here.

[Anders Carlsson]

Created attachment 82675 [details]
Patch

[Adam Roben (:aroben)]

Comment on attachment 82675 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=82675&action=review

> Tools/TestWebKitAPI/Tests/WebKit2/ForceRepaint.cpp:52
> +    WKRetainPtr<WKContextRef> context(AdoptWK, WKContextCreate());

You can use Util::adoptWK here instead if you like.

> Tools/TestWebKitAPI/Tests/WebKit2/ForceRepaint.cpp:62
> +    WKRetainPtr<WKURLRef> url(AdoptWK, Util::createURLForResource("simple-accelerated-compositing", "html"));

You can use Util::adoptWK here instead.

[Anders Carlsson]

Committed r78729: <http://trac.webkit.org/changeset/78729>