Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 370 insertions, 0 deletions

diff --git a/dom/smil/SMILTimeValueSpec.cpp b/dom/smil/SMILTimeValueSpec.cpp
new file mode 100644
index 0000000000..177c813bbc
--- /dev/null
+++ b/dom/smil/SMILTimeValueSpec.cpp
@@ -0,0 +1,370 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/EventListenerManager.h"
+#include "mozilla/SMILInstanceTime.h"
+#include "mozilla/SMILInterval.h"
+#include "mozilla/SMILParserUtils.h"
+#include "mozilla/SMILTimeContainer.h"
+#include "mozilla/SMILTimedElement.h"
+#include "mozilla/SMILTimeValueSpec.h"
+#include "mozilla/SMILTimeValue.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/Event.h"
+#include "mozilla/dom/SVGAnimationElement.h"
+#include "mozilla/dom/TimeEvent.h"
+#include "nsString.h"
+#include <limits>
+
+using namespace mozilla::dom;
+
+namespace mozilla {
+
+//----------------------------------------------------------------------
+// Nested class: EventListener
+
+NS_IMPL_ISUPPORTS(SMILTimeValueSpec::EventListener, nsIDOMEventListener)
+
+NS_IMETHODIMP
+SMILTimeValueSpec::EventListener::HandleEvent(Event* aEvent) {
+  if (mSpec) {
+    mSpec->HandleEvent(aEvent);
+  }
+  return NS_OK;
+}
+
+//----------------------------------------------------------------------
+// Implementation
+
+SMILTimeValueSpec::SMILTimeValueSpec(SMILTimedElement& aOwner, bool aIsBegin)
+    : mOwner(&aOwner), mIsBegin(aIsBegin), mReferencedElement(this) {}
+
+SMILTimeValueSpec::~SMILTimeValueSpec() {
+  UnregisterFromReferencedElement(mReferencedElement.get());
+  if (mEventListener) {
+    mEventListener->Disconnect();
+    mEventListener = nullptr;
+  }
+}
+
+nsresult SMILTimeValueSpec::SetSpec(const nsAString& aStringSpec,
+                                    Element& aContextElement) {
+  SMILTimeValueSpecParams params;
+
+  if (!SMILParserUtils::ParseTimeValueSpecParams(aStringSpec, params))
+    return NS_ERROR_FAILURE;
+
+  mParams = params;
+
+  // According to SMIL 3.0:
+  //   The special value "indefinite" does not yield an instance time in the
+  //   begin list. It will, however yield a single instance with the value
+  //   "indefinite" in an end list. This value is not removed by a reset.
+  if (mParams.mType == SMILTimeValueSpecParams::OFFSET ||
+      (!mIsBegin && mParams.mType == SMILTimeValueSpecParams::INDEFINITE)) {
+    mOwner->AddInstanceTime(new SMILInstanceTime(mParams.mOffset), mIsBegin);
+  }
+
+  // Fill in the event symbol to simplify handling later
+  if (mParams.mType == SMILTimeValueSpecParams::REPEAT) {
+    mParams.mEventSymbol = nsGkAtoms::repeatEvent;
+  }
+
+  ResolveReferences(aContextElement);
+
+  return NS_OK;
+}
+
+void SMILTimeValueSpec::ResolveReferences(Element& aContextElement) {
+  if (mParams.mType != SMILTimeValueSpecParams::SYNCBASE && !IsEventBased()) {
+    return;
+  }
+
+  // If we're not bound to the document yet, don't worry, we'll get called again
+  // when that happens
+  if (!aContextElement.IsInComposedDoc()) return;
+
+  // Hold ref to the old element so that it isn't destroyed in between resetting
+  // the referenced element and using the pointer to update the referenced
+  // element.
+  RefPtr<Element> oldReferencedElement = mReferencedElement.get();
+
+  if (mParams.mDependentElemID) {
+    mReferencedElement.ResetWithID(aContextElement, mParams.mDependentElemID);
+  } else if (mParams.mType == SMILTimeValueSpecParams::EVENT) {
+    Element* target = mOwner->GetTargetElement();
+    mReferencedElement.ResetWithElement(target);
+  } else {
+    MOZ_ASSERT(false, "Syncbase or repeat spec without ID");
+  }
+  UpdateReferencedElement(oldReferencedElement, mReferencedElement.get());
+}
+
+bool SMILTimeValueSpec::IsEventBased() const {
+  return mParams.mType == SMILTimeValueSpecParams::EVENT ||
+         mParams.mType == SMILTimeValueSpecParams::REPEAT;
+}
+
+void SMILTimeValueSpec::HandleNewInterval(
+    SMILInterval& aInterval, const SMILTimeContainer* aSrcContainer) {
+  const SMILInstanceTime& baseInstance =
+      mParams.mSyncBegin ? *aInterval.Begin() : *aInterval.End();
+  SMILTimeValue newTime =
+      ConvertBetweenTimeContainers(baseInstance.Time(), aSrcContainer);
+
+  // Apply offset
+  if (!ApplyOffset(newTime)) {
+    NS_WARNING("New time overflows SMILTime, ignoring");
+    return;
+  }
+
+  // Create the instance time and register it with the interval
+  RefPtr<SMILInstanceTime> newInstance = new SMILInstanceTime(
+      newTime, SMILInstanceTime::SOURCE_SYNCBASE, this, &aInterval);
+  mOwner->AddInstanceTime(newInstance, mIsBegin);
+}
+
+void SMILTimeValueSpec::HandleTargetElementChange(Element* aNewTarget) {
+  if (!IsEventBased() || mParams.mDependentElemID) return;
+
+  mReferencedElement.ResetWithElement(aNewTarget);
+}
+
+void SMILTimeValueSpec::HandleChangedInstanceTime(
+    const SMILInstanceTime& aBaseTime, const SMILTimeContainer* aSrcContainer,
+    SMILInstanceTime& aInstanceTimeToUpdate, bool aObjectChanged) {
+  // If the instance time is fixed (e.g. because it's being used as the begin
+  // time of an active or postactive interval) we just ignore the change.
+  if (aInstanceTimeToUpdate.IsFixedTime()) return;
+
+  SMILTimeValue updatedTime =
+      ConvertBetweenTimeContainers(aBaseTime.Time(), aSrcContainer);
+
+  // Apply offset
+  if (!ApplyOffset(updatedTime)) {
+    NS_WARNING("Updated time overflows SMILTime, ignoring");
+    return;
+  }
+
+  // The timed element that owns the instance time does the updating so it can
+  // re-sort its array of instance times more efficiently
+  if (aInstanceTimeToUpdate.Time() != updatedTime || aObjectChanged) {
+    mOwner->UpdateInstanceTime(&aInstanceTimeToUpdate, updatedTime, mIsBegin);
+  }
+}
+
+void SMILTimeValueSpec::HandleDeletedInstanceTime(
+    SMILInstanceTime& aInstanceTime) {
+  mOwner->RemoveInstanceTime(&aInstanceTime, mIsBegin);
+}
+
+bool SMILTimeValueSpec::DependsOnBegin() const { return mParams.mSyncBegin; }
+
+void SMILTimeValueSpec::Traverse(
+    nsCycleCollectionTraversalCallback* aCallback) {
+  mReferencedElement.Traverse(aCallback);
+}
+
+void SMILTimeValueSpec::Unlink() {
+  UnregisterFromReferencedElement(mReferencedElement.get());
+  mReferencedElement.Unlink();
+}
+
+//----------------------------------------------------------------------
+// Implementation helpers
+
+void SMILTimeValueSpec::UpdateReferencedElement(Element* aFrom, Element* aTo) {
+  if (aFrom == aTo) return;
+
+  UnregisterFromReferencedElement(aFrom);
+
+  switch (mParams.mType) {
+    case SMILTimeValueSpecParams::SYNCBASE: {
+      SMILTimedElement* to = GetTimedElement(aTo);
+      if (to) {
+        to->AddDependent(*this);
+      }
+    } break;
+
+    case SMILTimeValueSpecParams::EVENT:
+    case SMILTimeValueSpecParams::REPEAT:
+      RegisterEventListener(aTo);
+      break;
+
+    default:
+      // not a referencing-type
+      break;
+  }
+}
+
+void SMILTimeValueSpec::UnregisterFromReferencedElement(Element* aElement) {
+  if (!aElement) return;
+
+  if (mParams.mType == SMILTimeValueSpecParams::SYNCBASE) {
+    SMILTimedElement* timedElement = GetTimedElement(aElement);
+    if (timedElement) {
+      timedElement->RemoveDependent(*this);
+    }
+    mOwner->RemoveInstanceTimesForCreator(this, mIsBegin);
+  } else if (IsEventBased()) {
+    UnregisterEventListener(aElement);
+  }
+}
+
+SMILTimedElement* SMILTimeValueSpec::GetTimedElement(Element* aElement) {
+  auto* animationElement = SVGAnimationElement::FromNodeOrNull(aElement);
+  return animationElement ? &animationElement->TimedElement() : nullptr;
+}
+
+// Indicates whether we're allowed to register an event-listener
+// when scripting is disabled.
+bool SMILTimeValueSpec::IsEventAllowedWhenScriptingIsDisabled() {
+  // The category of (SMIL-specific) "repeat(n)" events are allowed.
+  if (mParams.mType == SMILTimeValueSpecParams::REPEAT) {
+    return true;
+  }
+
+  // A specific list of other SMIL-related events are allowed, too.
+  if (mParams.mType == SMILTimeValueSpecParams::EVENT &&
+      (mParams.mEventSymbol == nsGkAtoms::repeat ||
+       mParams.mEventSymbol == nsGkAtoms::repeatEvent ||
+       mParams.mEventSymbol == nsGkAtoms::beginEvent ||
+       mParams.mEventSymbol == nsGkAtoms::endEvent)) {
+    return true;
+  }
+
+  return false;
+}
+
+void SMILTimeValueSpec::RegisterEventListener(Element* aTarget) {
+  MOZ_ASSERT(IsEventBased(),
+             "Attempting to register event-listener for unexpected "
+             "SMILTimeValueSpec type");
+  MOZ_ASSERT(mParams.mEventSymbol,
+             "Attempting to register event-listener but there is no event "
+             "name");
+
+  if (!aTarget) return;
+
+  // When script is disabled, only allow registration for limited events.
+  if (!aTarget->GetOwnerDocument()->IsScriptEnabled() &&
+      !IsEventAllowedWhenScriptingIsDisabled()) {
+    return;
+  }
+
+  if (!mEventListener) {
+    mEventListener = new EventListener(this);
+  }
+
+  EventListenerManager* elm = aTarget->GetOrCreateListenerManager();
+  if (!elm) {
+    return;
+  }
+
+  elm->AddEventListenerByType(mEventListener,
+                              nsDependentAtomString(mParams.mEventSymbol),
+                              AllEventsAtSystemGroupBubble());
+}
+
+void SMILTimeValueSpec::UnregisterEventListener(Element* aTarget) {
+  if (!aTarget || !mEventListener) {
+    return;
+  }
+
+  EventListenerManager* elm = aTarget->GetOrCreateListenerManager();
+  if (!elm) {
+    return;
+  }
+
+  elm->RemoveEventListenerByType(mEventListener,
+                                 nsDependentAtomString(mParams.mEventSymbol),
+                                 AllEventsAtSystemGroupBubble());
+}
+
+void SMILTimeValueSpec::HandleEvent(Event* aEvent) {
+  MOZ_ASSERT(mEventListener, "Got event without an event listener");
+  MOZ_ASSERT(IsEventBased(), "Got event for non-event SMILTimeValueSpec");
+  MOZ_ASSERT(aEvent, "No event supplied");
+
+  // XXX In the long run we should get the time from the event itself which will
+  // store the time in global document time which we'll need to convert to our
+  // time container
+  SMILTimeContainer* container = mOwner->GetTimeContainer();
+  if (!container) return;
+
+  if (mParams.mType == SMILTimeValueSpecParams::REPEAT &&
+      !CheckRepeatEventDetail(aEvent)) {
+    return;
+  }
+
+  SMILTime currentTime = container->GetCurrentTimeAsSMILTime();
+  SMILTimeValue newTime(currentTime);
+  if (!ApplyOffset(newTime)) {
+    NS_WARNING("New time generated from event overflows SMILTime, ignoring");
+    return;
+  }
+
+  RefPtr<SMILInstanceTime> newInstance =
+      new SMILInstanceTime(newTime, SMILInstanceTime::SOURCE_EVENT);
+  mOwner->AddInstanceTime(newInstance, mIsBegin);
+}
+
+bool SMILTimeValueSpec::CheckRepeatEventDetail(Event* aEvent) {
+  TimeEvent* timeEvent = aEvent->AsTimeEvent();
+  if (!timeEvent) {
+    NS_WARNING("Received a repeat event that was not a DOMTimeEvent");
+    return false;
+  }
+
+  int32_t detail = timeEvent->Detail();
+  return detail > 0 && (uint32_t)detail == mParams.mRepeatIteration;
+}
+
+SMILTimeValue SMILTimeValueSpec::ConvertBetweenTimeContainers(
+    const SMILTimeValue& aSrcTime, const SMILTimeContainer* aSrcContainer) {
+  // If the source time is either indefinite or unresolved the result is going
+  // to be the same
+  if (!aSrcTime.IsDefinite()) return aSrcTime;
+
+  // Convert from source time container to our parent time container
+  const SMILTimeContainer* dstContainer = mOwner->GetTimeContainer();
+  if (dstContainer == aSrcContainer) return aSrcTime;
+
+  // If one of the elements is not attached to a time container then we can't do
+  // any meaningful conversion
+  if (!aSrcContainer || !dstContainer) return SMILTimeValue();  // unresolved
+
+  SMILTimeValue docTime =
+      aSrcContainer->ContainerToParentTime(aSrcTime.GetMillis());
+
+  if (docTime.IsIndefinite())
+    // This will happen if the source container is paused and we have a future
+    // time. Just return the indefinite time.
+    return docTime;
+
+  MOZ_ASSERT(docTime.IsDefinite(),
+             "ContainerToParentTime gave us an unresolved or indefinite time");
+
+  return dstContainer->ParentToContainerTime(docTime.GetMillis());
+}
+
+bool SMILTimeValueSpec::ApplyOffset(SMILTimeValue& aTime) const {
+  // indefinite + offset = indefinite. Likewise for unresolved times.
+  if (!aTime.IsDefinite()) {
+    return true;
+  }
+
+  double resultAsDouble =
+      (double)aTime.GetMillis() + mParams.mOffset.GetMillis();
+  if (resultAsDouble > double(std::numeric_limits<SMILTime>::max()) ||
+      resultAsDouble < double(std::numeric_limits<SMILTime>::min())) {
+    return false;
+  }
+  aTime.SetMillis(aTime.GetMillis() + mParams.mOffset.GetMillis());
+  return true;
+}
+
+}  // namespace mozilla