[Webkit-unassigned] [Bug 238846] ImageBitmapRenderingContext::setOutputBitmap() can trigger accelerated drawing in the webcontent process

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=238846

--- Comment #4 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
I confirm your findings:

* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.1
  * frame #0: 0x00000001e00ff320 IOSurface`IOSurfaceCreate
    frame #1: 0x00000001165d0f04 WebCore`WebCore::IOSurface::create(WebCore::IOSurfacePool*, WebCore::IntSize, WebCore::IntSize, WebCore::DestinationColorSpace const&, WebCore::IOSurface::Format) + 372
    frame #2: 0x0000000117651e64 WebCore`WebCore::ImageBufferIOSurfaceBackend::create(WebCore::ImageBufferBackend::Parameters const&, WebCore::ImageBuffer::CreationContext const&) + 328
    frame #3: 0x00000001165ddf44 WebCore`WTF::RefPtr<WebCore::IOSurfaceImageBuffer, WTF::RawPtrTraits<WebCore::IOSurfaceImageBuffer>, WTF::DefaultRefDerefTraits<WebCore::IOSurfaceImageBuffer> > WebCore::ConcreteImageBuffer<WebCore::ImageBufferIOSurfaceBackend>::create<WebCore::IOSurfaceImageBuffer>(WebCore::FloatSize const&, float, WebCore::DestinationColorSpace const&, WebCore::PixelFormat, WebCore::ImageBuffer::CreationContext const&) + 84
    frame #4: 0x00000001170c2bb4 WebCore`WebCore::ImageBitmapRenderingContext::setOutputBitmap(WTF::RefPtr<WebCore::ImageBitmap, WTF::RawPtrTraits<WebCore::ImageBitmap>, WTF::DefaultRefDerefTraits<WebCore::ImageBitmap> >) + 296
    frame #5: 0x00000001170c2918 WebCore`WebCore::ImageBitmapRenderingContext::create(WebCore::CanvasBase&, WebCore::ImageBitmapRenderingContextSettings&&) + 232
    frame #6: 0x0000000116f87c5c WebCore`WebCore::HTMLCanvasElement::getContext(JSC::JSGlobalObject&, WTF::String const&, WTF::FixedVector<JSC::Strong<JSC::Unknown, (JSC::ShouldStrongDestructorGrabLock)0> >&&) + 980
    frame #7: 0x0000000115fc65ac WebCore`WebCore::jsHTMLCanvasElementPrototypeFunction_getContext(JSC::JSGlobalObject*, JSC::CallFrame*) + 328
    frame #8: 0x0000000bece6c204
    frame #9: 0x0000000bece64248
    frame #10: 0x0000000bece64248
    frame #11: 0x0000000bece64848
    frame #12: 0x000000010dcaba84 JavaScriptCore`JSC::Interpreter::executeCall(JSC::JSGlobalObject*, JSC::JSObject*, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 520
    frame #13: 0x000000010df438f0 JavaScriptCore`JSC::profiledCall(JSC::JSGlobalObject*, JSC::ProfilingReason, JSC::JSValue, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, WTF::NakedPtr<JSC::Exception>&) + 104
    frame #14: 0x0000000116992974 WebCore`WebCore::JSEventListener::handleEvent(WebCore::ScriptExecutionContext&, WebCore::Event&) + 936
    frame #15: 0x0000000116d17068 WebCore`WebCore::EventTarget::innerInvokeEventListeners(WebCore::Event&, WTF::Vector<WTF::RefPtr<WebCore::RegisteredEventListener, WTF::RawPtrTraits<WebCore::RegisteredEventListener>, WTF::DefaultRefDerefTraits<WebCore::RegisteredEventListener> >, 1ul, WTF::CrashOnOverflow, 2ul, WTF::FastMalloc>, WebCore::EventTarget::EventInvokePhase) + 556
    frame #16: 0x0000000116d16ad8 WebCore`WebCore::EventTarget::fireEventListeners(WebCore::Event&, WebCore::EventTarget::EventInvokePhase) + 520
    frame #17: 0x0000000116d0b820 WebCore`WebCore::dispatchEventInDOM(WebCore::Event&, WebCore::EventPath const&) + 240
    frame #18: 0x0000000116d0a94c WebCore`WebCore::EventDispatcher::dispatchEvent(WebCore::Node&, WebCore::Event&) + 824
    frame #19: 0x0000000116fbd964 WebCore`WebCore::HTMLImageLoader::dispatchLoadEvent() + 356
    frame #20: 0x000000011731e004 WebCore`WebCore::ImageLoader::dispatchPendingLoadEvent() + 112
    frame #21: 0x000000011731dcc0 WebCore`WebCore::ImageLoader::dispatchPendingEvent(WebCore::EventSender<WebCore::ImageLoader>*) + 100
    frame #22: 0x000000011731e208 WebCore`WebCore::EventSender<WebCore::ImageLoader>::dispatchPendingEvents(WebCore::Page*) + 284
    frame #23: 0x0000000116ca96dc WebCore`WebCore::Document::implicitClose() + 484

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