203105 2019-10-17 09:58:24 -0700 VRDisplay should not prevent entering the back/forward cache 2019-11-07 06:44:39 -0800 1 1 1 Unclassified WebKit WebCore Misc. WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 202293 1 cdumez svillar aperez bugs-noreply svillar webkit-bug-importer zan oldest_to_newest 1581018 0 cdumez 2019-10-17 09:58:24 -0700 VRDisplay should not prevent entering the back/forward cache. 1583484 1 cdumez 2019-10-24 13:20:21 -0700 Would someone be able to work on this? 1584855 2 svillar 2019-10-29 01:30:06 -0700 Chris could you add a little bit more context? 1584915 3 cdumez 2019-10-29 08:21:28 -0700 (In reply to Sergio Villar Senin from comment #2) > Chris could you add a little bit more context? We are working on making the back/forward cache (formerly known as the page cache) 100% successful at caching pages. As a result of this, we no longer allow ActiveDOMObjects to prevent caching. ALL ActiveDOMObject (including VRDisplay) need to suspend correctly. Currently, any page which uses a VRDisplay will not be able to enter the back/forward cache because of this code: // FIXME: This should never prevent entering the back/forward cache. bool VRDisplay::shouldPreventEnteringBackForwardCache_DEPRECATED() const { return true; } This method needs to be removed to allow the page to enter the back/forward cache. Then you'll likely need to override ActiveDOMObject's suspend() and resume() to implement correct suspension. Looking at VRDisplay, it is likely the following needs to be done: 1. Instead of dispatching events synchronously, append tasks to the WindowEventLoop to dispatch them. The WindowEventLoop correctly suspends while in the cache. 2. Call suspend() / resume() on m_scriptedAnimationController to suspend animations while in the cache 3. Maybe call stopPresenting() on suspension? I don't know much about VRDisplay. 1585303 4 svillar 2019-10-30 01:43:21 -0700 (In reply to Chris Dumez from comment #3) > (In reply to Sergio Villar Senin from comment #2) > > Chris could you add a little bit more context? > > We are working on making the back/forward cache (formerly known as the page > cache) 100% successful at caching pages. As a result of this, we no longer > allow ActiveDOMObjects to prevent caching. ALL ActiveDOMObject (including > VRDisplay) need to suspend correctly. > > Currently, any page which uses a VRDisplay will not be able to enter the > back/forward cache because of this code: > // FIXME: This should never prevent entering the back/forward cache. > bool VRDisplay::shouldPreventEnteringBackForwardCache_DEPRECATED() const > { > return true; > } Ah I was not aware of such a thing, it was not there when I added the code. > This method needs to be removed to allow the page to enter the back/forward > cache. Then you'll likely need to override ActiveDOMObject's suspend() and > resume() to implement correct suspension. Looking at VRDisplay, it is likely > the following needs to be done: > 1. Instead of dispatching events synchronously, append tasks to the > WindowEventLoop to dispatch them. The WindowEventLoop correctly suspends > while in the cache. > 2. Call suspend() / resume() on m_scriptedAnimationController to suspend > animations while in the cache > 3. Maybe call stopPresenting() on suspension? I don't know much about > VRDisplay. I understand the issue now, I'll come up with something. 1585351 5 cdumez 2019-10-30 08:04:20 -0700 (In reply to Sergio Villar Senin from comment #4) > (In reply to Chris Dumez from comment #3) > > (In reply to Sergio Villar Senin from comment #2) > > > Chris could you add a little bit more context? > > > > We are working on making the back/forward cache (formerly known as the page > > cache) 100% successful at caching pages. As a result of this, we no longer > > allow ActiveDOMObjects to prevent caching. ALL ActiveDOMObject (including > > VRDisplay) need to suspend correctly. > > > > Currently, any page which uses a VRDisplay will not be able to enter the > > back/forward cache because of this code: > > // FIXME: This should never prevent entering the back/forward cache. > > bool VRDisplay::shouldPreventEnteringBackForwardCache_DEPRECATED() const > > { > > return true; > > } > > Ah I was not aware of such a thing, it was not there when I added the code. It was there, it was just named differently. It used to be: bool VRDisplay::canSuspendForPageCache() const { return false; } I am pretty sure you added that code and the name is pretty clear about the implications. 1585358 6 cdumez 2019-10-30 08:19:40 -0700 > > This method needs to be removed to allow the page to enter the back/forward > > cache. Then you'll likely need to override ActiveDOMObject's suspend() and > > resume() to implement correct suspension. Looking at VRDisplay, it is likely > > the following needs to be done: > > 1. Instead of dispatching events synchronously, append tasks to the > > WindowEventLoop to dispatch them. The WindowEventLoop correctly suspends > > while in the cache. > > 2. Call suspend() / resume() on m_scriptedAnimationController to suspend > > animations while in the cache > > 3. Maybe call stopPresenting() on suspension? I don't know much about > > VRDisplay. > > I understand the issue now, I'll come up with something. Thanks for you help. 1587045 7 zan 2019-11-04 10:24:47 -0800 (In reply to Chris Dumez from comment #3) > 1. Instead of dispatching events synchronously, append tasks to the > WindowEventLoop to dispatch them. The WindowEventLoop correctly suspends > while in the cache. Right now the events are only dispatched against the DOMWindow object. Should the dispatch be asynchronous regardless of the target? 1587060 8 cdumez 2019-11-04 11:00:36 -0800 (In reply to Zan Dobersek from comment #7) > (In reply to Chris Dumez from comment #3) > > 1. Instead of dispatching events synchronously, append tasks to the > > WindowEventLoop to dispatch them. The WindowEventLoop correctly suspends > > while in the cache. > > Right now the events are only dispatched against the DOMWindow object. > Should the dispatch be asynchronous regardless of the target? Yes, I believe so. 1587388 9 382822 zan 2019-11-05 07:15:31 -0800 Created attachment 382822 WIP Test pending. 1587397 10 382824 svillar 2019-11-05 08:10:41 -0800 Created attachment 382824 Patch 1587400 11 382824 cdumez 2019-11-05 08:14:45 -0800 Comment on attachment 382824 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=382824&action=review > Source/WebCore/Modules/webvr/VRDisplay.cpp:216 > +void VRDisplay::dispatchVRDisplayEventInWindowEventLoop(const WTF::AtomString& eventName, Optional<VRDisplayEventReason>&& reason) Ryosuke already added ActiveDOMObject::queueTaskToDispatchEvent() for this purpose. > Source/WebCore/Modules/webvr/VRDisplay.cpp:258 > + stopPresenting(); Note that you may want to do this only if the reason for suspension is BackForwardCache. 1587406 12 382827 svillar 2019-11-05 08:52:03 -0800 Created attachment 382827 Dispatch events in DOMWindow 1587416 13 382827 cdumez 2019-11-05 09:10:51 -0800 Comment on attachment 382827 Dispatch events in DOMWindow Please see previous review comments. 1587423 14 zan 2019-11-05 09:17:51 -0800 We can use ActiveDOMObject::queueTaskKeepingObjectAlive(). The event-dispatch version doesn't properly handle the target for this case. 1587426 15 cdumez 2019-11-05 09:25:28 -0800 (In reply to Zan Dobersek from comment #14) > We can use ActiveDOMObject::queueTaskKeepingObjectAlive(). The > event-dispatch version doesn't properly handle the target for this case. I did not understand this comment. 1587429 16 382827 zan 2019-11-05 09:28:04 -0800 Comment on attachment 382827 Dispatch events in DOMWindow View in context: https://bugs.webkit.org/attachment.cgi?id=382827&action=review Inlining the comment into the patch ... > Source/WebCore/Modules/webvr/VRDisplay.cpp:224 > + auto event = VRDisplayEvent::create(eventName, makeRefPtr(this), WTFMove(reason)); > + document()->eventLoop().queueTask(TaskSource::UserInteraction, *document(), [this, event = WTFMove(event)]() mutable { > + if (!document()) > + return; > + if (auto* window = document()->domWindow()) > + window->dispatchEvent(event); > + }); This should use the queueTaskKeepingObjectAlive() function. queueTaskToDispatchEvent() would be an option if the VRDisplay object was the target of these events, but it's not. 1587732 17 382909 svillar 2019-11-06 03:57:41 -0800 Created attachment 382909 Patch 1587749 18 svillar 2019-11-06 05:02:08 -0800 (In reply to Zan Dobersek from comment #16) > Comment on attachment 382827 [details] > Dispatch events in DOMWindow > > View in context: > https://bugs.webkit.org/attachment.cgi?id=382827&action=review > > Inlining the comment into the patch ... > > > Source/WebCore/Modules/webvr/VRDisplay.cpp:224 > > + auto event = VRDisplayEvent::create(eventName, makeRefPtr(this), WTFMove(reason)); > > + document()->eventLoop().queueTask(TaskSource::UserInteraction, *document(), [this, event = WTFMove(event)]() mutable { > > + if (!document()) > > + return; > > + if (auto* window = document()->domWindow()) > > + window->dispatchEvent(event); > > + }); > > This should use the queueTaskKeepingObjectAlive() function. > queueTaskToDispatchEvent() would be an option if the VRDisplay object was > the target of these events, but it's not. Right. I guess in the end it's a matter of taste as it does not change essentially anything wrt eventLoop()->queueTask(), but I replaced it in the new patch version. 1587781 19 382909 cdumez 2019-11-06 08:06:03 -0800 Comment on attachment 382909 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=382909&action=review > Source/WebCore/ChangeLog:16 > + No new tests were added as there is no testing machinery for WebVR so far. It's unclear how :( > Source/WebCore/Modules/webvr/VRDisplay.cpp:216 > +void VRDisplay::dispatchVRDisplayEventInEventLoop(const WTF::AtomString& eventName, Optional<VRDisplayEventReason>&& reason) We likely don't need the WTF:: > Source/WebCore/Modules/webvr/VRDisplay.cpp:261 > + stopPresenting(); As mentioned earlier, you likely want to stop presenting ONLY if ReasonForSuspension is ReasonForSuspension::BackForwardCache. > Source/WebCore/Modules/webvr/VRDisplay.h:119 > + void dispatchVRDisplayEventInEventLoop(const WTF::AtomString& eventName, Optional<VRDisplayEventReason>&&); WTF:: likely unnecessary. 1588131 20 svillar 2019-11-07 00:06:16 -0800 Committed r252178: <https://trac.webkit.org/changeset/252178> 1588132 21 webkit-bug-importer 2019-11-07 00:07:19 -0800 <rdar://problem/56974306> 1588193 22 cdumez 2019-11-07 06:44:39 -0800 Thanks for fixing! 382822 2019-11-05 07:15:31 -0800 2019-11-05 08:10:37 -0800 WIP bug-203105-20191105161530.patch text/plain 5663 zan 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