디지털 장인정신

I investigated when enabling Accelerated Compositing. However, process is the same to software path until RenderLayer::styleChanged() in 3. Notify filters changed.

1. Animation loop : loop using timer in AnimationControllerPrivate

FrameView::serviceScriptedAnimations() <- request animation frame callback

AnimationController::serviceAnimations()

AnimationControllerPrivate::animationFrameCallbackFired()

AnimationControllerPrivate::updateAnimationTimer()

1) m_animationTimer.startRepeating() if needed: creating loop

AnimationControllerPrivate::updateAnimations()

Document::updateStyleIfNeeded()

void RenderObject::setAnimatableStyle(PassRefPtr<RenderStyle> style)

{

    if (!isText() && style)

        setStyle(animation()->updateAnimations(this, style.get()));

    else

        setStyle(style);

}

1) Blend FilterOperation

2) Notify filters changed

2. Blend FilterOperation : Create FilterOperations per frame.

AnimationController::updateAnimations()

CompositeAnimation::animate()

KeyframeAnimation::animate()

CSSPropertyAnimation::blendProperties()

PropertyWrapperAcceleratedFilter::blend()

BasicColorMatrixFilterOperation::blend()

3. Notify filters changed : notify FilterOperations changed to RenderLayer

RenderObject::setStyle()

RenderLayerModelObject::styleDidChange()

RenderLayer::styleChanged()

4) ensure backing if needed

5) notify flush

4. ensure backing if needed : create RenderLayerBacking at the first time.

RenderLayerCompositor::updateLayerCompositingState()

RenderLayerCompositor::updateBacking()

RenderLayer::ensureBacking()

5. notify flush : notify FilterOperations changed to GraphicsLayer

RenderLayerBacking::updateGraphicsLayerGeometry()

RenderLayerBacking::updateFilters()

GraphicsLayerTextureMapper::setFilters()

LayerTreeCoordinator[AcceleratedCompositingContext]::scheduleLayerFlush()

Refer to

http://lists.webkit.org/pipermail/webkit-gtk/2012-May/001078.html

void WebProcess::postInjectedBundleMessage(const CoreIPC::DataReference& messageData)

{

    InjectedBundle* injectedBundle = WebProcess::shared().injectedBundle();

    ...

}

in Tools/WebKitTestRunner/InjectedBundle/InjectedBundleMain.cpp

void WKBundleInitialize(WKBundleRef bundle, WKTypeRef initializationUserData)

{

    WTR::InjectedBundle::shared().initialize(bundle, initializationUserData);

}

in Tools/WebKitTestRunner/InjectedBundle/InjectedBundle.cpp

void InjectedBundle::initialize(WKBundleRef bundle, WKTypeRef initializationUserData)

{

    WKBundleClient client = {

    };

    WKBundleSetClient(m_bundle, &client);

}

in Source/WebKit2/WebProcess/InjectedBundle/InjectedBundle.cpp

void InjectedBundle::initializeClient(WKBundleClient* client)

{

    m_client.initialize(client);

}

2. create page

in Source/WebKit2/WebProcess/WebPage/WebPage/WebPage.cpp

PassRefPtr<WebPage> WebPage::create(uint64_t pageID, const WebPageCreationParameters& parameters)

{

    ....

    if (page->pageGroup()->isVisibleToInjectedBundle() && WebProcess::shared().injectedBundle())

        WebProcess::shared().injectedBundle()->didCreatePage(page.get());

    ....

}

in Tools/WebKitTestRunner/InjectedBundle/InjectedBundle.cpp

void InjectedBundle::didCreatePage(WKBundlePageRef page)

{

    m_pages.append(adoptPtr(new InjectedBundlePage(page)));

}

in Tools/WebKitTestRunner/InjectedBundle/InjectedBundlePage.cpp

InjectedBundlePage::InjectedBundlePage(WKBundlePageRef page)

    : m_page(page)

    , m_world(AdoptWK, WKBundleScriptWorldCreateWorld())

{

    WKBundlePageLoaderClient loaderClient = {    };

    WKBundlePageSetPageLoaderClient(m_page, &loaderClient);

    WKBundlePageResourceLoadClient resourceLoadClient = {    };

    WKBundlePageSetResourceLoadClient(m_page, &resourceLoadClient);

    WKBundlePagePolicyClient policyClient = {    };

    WKBundlePageSetPolicyClient(m_page, &policyClient);

    WKBundlePageUIClient uiClient = {    };

    WKBundlePageSetUIClient(m_page, &uiClient);

    WKBundlePageEditorClient editorClient = {    };

    WKBundlePageSetEditorClient(m_page, &editorClient);

#if ENABLE(FULLSCREEN_API)

    WKBundlePageFullScreenClient fullScreenClient = {    };

    WKBundlePageSetFullScreenClient(m_page, &fullScreenClient);

#endif

}

in Source/WebKit2/WebProcess/WebPage/WebPage/WebPage.cpp

void WebPage::initializeInjectedBundleLoaderClient(WKBundlePageLoaderClient* client)

{

    ....

    m_loaderClient.initialize(client);

}

3. loader callback

in Source/WebKit2/WebProcess/WebCoreSupport/WebFrameLoaderClient.cpp

void WebFrameLoaderClient::postProgressFinishedNotification()

{

    if (WebPage* webPage = m_frame->page()) {

        if (m_frame->isMainFrame()) {

            // Notify the bundle client.

            webPage->injectedBundleLoaderClient().didFinishProgress(webPage);

            webPage->send(Messages::WebPageProxy::DidFinishProgress());

        }

    }

}

in Tools/WebKitTestRunner/InjectedBundle/InjectedBundlePage.cpp

void InjectedBundlePage::didFinishProgress(WKBundlePageRef, const void *clientInfo)

{

    static_cast<InjectedBundlePage*>(const_cast<void*>(clientInfo))->didFinishProgress();

}

Build

InjectedBundle은 shared library로 따로 빌드된다. WebKitTestRunner를 실행히 env로 shared library의 path가 세팅된다.

in  Tools/WebKitTestRunner/GNUmakefile.am

# The InjectedBundle library allows the render process to load harness code.

if ENABLE_WEBKIT2

noinst_LTLIBRARIES += Libraries/libTestRunnerInjectedBundle.la

endif

How to send InjectedBundle path from UI Process to Web Process

위에서 서술하다 싶이 env로 UI Process의 TestController가 알아낸후 WebContext에게 알려준다.

in Tools/WebKitTestRunner/gtk/main.cpp

int main(int argc, char** argv)

{

    gtk_init(&argc, &argv);

    // Prefer the not installed web and plugin processes.

    WTR::TestController controller(argc, const_cast<const char**>(argv));

    return 0;

}

in Tools/WebKitTestRunner/TestController.cpp

void TestController::initialize(int argc, const char* argv[])

{

    ...

    initializeInjectedBundlePath();

    ...

    m_context.adopt(WKContextCreateWithInjectedBundlePath(injectedBundlePath()));

    ...

}

in Source/WebKit2/UIrocess/WebContext.cpp

PassRefPtr<WebContext> WebContext::create(const String& injectedBundlePath)

{

    JSC::initializeThreading();

    WTF::initializeMainThread();

    RunLoop::initializeMainRunLoop();

    return adoptRef(new WebContext(ProcessModelSharedSecondaryProcess, injectedBundlePath));

}

What is InjectedBundle in UI Process

UI Process에도 callback을 inject하는 듯한 코드들이 있다. (밑에처럼)

이것은 shared library를 ld하여 callback을 등록한다는 개념의 injected bundle보다는, 그냥 callback을 등록하는 코드이다.

코드를 reuse하기위해 콜백등록 패턴을 그냥 쓰는데, 코드를 읽는데 굉장한 혼란을 준다.

in Tools/WebKitTestRunner/TestController.cpp

void TestController::initialize(int argc, const char* argv[])

{

    ...

    WKContextInjectedBundleClient injectedBundleClient = {

        kWKContextInjectedBundleClientCurrentVersion,

        this,

        didReceiveMessageFromInjectedBundle,

        didReceiveSynchronousMessageFromInjectedBundle,

        0 // getInjectedBundleInitializationUserData

    };

    WKContextSetInjectedBundleClient(m_context.get(), &injectedBundleClient);

    ...

}

how to use

http://lbrandy.com/blog/2008/11/oprofile-profiling-in-linux-for-fun-and-profit/

how to profile WebKit

http://trac.webkit.org/wiki/QtWebKitProfilingSetup

how to build vmlinux and attach to oprofile

http://lovebug356.blogspot.kr/2008/06/oprofile-setup-on-ubuntu.html

ubuntu 12.04 is not supported

https://launchpad.net/ubuntu/precise/amd64/oprofile/0.9.6-1.3ubuntu1

various profile wiki

http://wiki.gnashdev.org/Profiling