1 files changed, 183 insertions, 0 deletions
diff --git a/dom/svg/SVGAnimatedPointList.cpp b/dom/svg/SVGAnimatedPointList.cpp
new file mode 100644
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+++ b/dom/svg/SVGAnimatedPointList.cpp
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+/* -*- 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 "SVGAnimatedPointList.h"
+
+#include <utility>
+
+#include "DOMSVGPointList.h"
+#include "SVGPointListSMILType.h"
+#include "mozilla/SMILValue.h"
+#include "mozilla/dom/SVGElement.h"
+
+using namespace mozilla::dom;
+
+// See the comments in this file's header!
+
+namespace mozilla {
+
+nsresult SVGAnimatedPointList::SetBaseValueString(const nsAString& aValue) {
+  SVGPointList newBaseValue;
+
+  // The spec says that the point data is parsed and accepted up to the first
+  // error encountered, so we don't return early if an error occurs. However,
+  // we do want to throw any error code from setAttribute if there's a problem.
+
+  nsresult rv = newBaseValue.SetValueFromString(aValue);
+
+  // We must send these notifications *before* changing mBaseVal! Our baseVal's
+  // DOM wrapper list may have to remove DOM items from itself, and any removed
+  // DOM items need to copy their internal counterpart's values *before* we
+  // change them. See the comments in
+  // DOMSVGPointList::InternalListWillChangeTo().
+
+  DOMSVGPointList* baseValWrapper =
+      DOMSVGPointList::GetDOMWrapperIfExists(GetBaseValKey());
+  if (baseValWrapper) {
+    baseValWrapper->InternalListWillChangeTo(newBaseValue);
+  }
+
+  DOMSVGPointList* animValWrapper = nullptr;
+  if (!IsAnimating()) {  // DOM anim val wraps our base val too!
+    animValWrapper = DOMSVGPointList::GetDOMWrapperIfExists(GetAnimValKey());
+    if (animValWrapper) {
+      animValWrapper->InternalListWillChangeTo(newBaseValue);
+    }
+  }
+
+  // Only now may we modify mBaseVal!
+
+  // We don't need to call DidChange* here - we're only called by
+  // SVGElement::ParseAttribute under Element::SetAttr,
+  // which takes care of notifying.
+
+  mBaseVal.SwapWith(newBaseValue);
+  return rv;
+}
+
+void SVGAnimatedPointList::ClearBaseValue() {
+  // We must send these notifications *before* changing mBaseVal! (See above.)
+
+  DOMSVGPointList* baseValWrapper =
+      DOMSVGPointList::GetDOMWrapperIfExists(GetBaseValKey());
+  if (baseValWrapper) {
+    baseValWrapper->InternalListWillChangeTo(SVGPointList());
+  }
+
+  if (!IsAnimating()) {  // DOM anim val wraps our base val too!
+    DOMSVGPointList* animValWrapper =
+        DOMSVGPointList::GetDOMWrapperIfExists(GetAnimValKey());
+    if (animValWrapper) {
+      animValWrapper->InternalListWillChangeTo(SVGPointList());
+    }
+  }
+
+  mBaseVal.Clear();
+  // Caller notifies
+}
+
+nsresult SVGAnimatedPointList::SetAnimValue(const SVGPointList& aNewAnimValue,
+                                            SVGElement* aElement) {
+  // Note that a new animation may totally change the number of items in the
+  // animVal list, either replacing what was essentially a mirror of the
+  // baseVal list, or else replacing and overriding an existing animation.
+  // It is not possible for us to reliably distinguish between calls to this
+  // method that are setting a new sample for an existing animation (in which
+  // case our list length isn't changing and we wouldn't need to notify our DOM
+  // wrapper to keep its length in sync), and calls to this method that are
+  // setting the first sample of a new animation that will override the base
+  // value/an existing animation (in which case our length may be changing and
+  // our DOM wrapper may need to be notified). Happily though, it's cheap to
+  // just blindly notify our animVal's DOM wrapper of our new value each time
+  // this method is called, so that's what we do.
+
+  // We must send this notification *before* changing mAnimVal! (See above.)
+
+  DOMSVGPointList* domWrapper =
+      DOMSVGPointList::GetDOMWrapperIfExists(GetAnimValKey());
+  if (domWrapper) {
+    domWrapper->InternalListWillChangeTo(aNewAnimValue);
+  }
+  if (!mAnimVal) {
+    mAnimVal = MakeUnique<SVGPointList>();
+  }
+  nsresult rv = mAnimVal->CopyFrom(aNewAnimValue);
+  if (NS_FAILED(rv)) {
+    // OOM. We clear the animation and, importantly, ClearAnimValue() ensures
+    // that mAnimVal's DOM wrapper (if any) is kept in sync!
+    ClearAnimValue(aElement);
+    return rv;
+  }
+  aElement->DidAnimatePointList();
+  return NS_OK;
+}
+
+void SVGAnimatedPointList::ClearAnimValue(SVGElement* aElement) {
+  // We must send these notifications *before* changing mAnimVal! (See above.)
+
+  DOMSVGPointList* domWrapper =
+      DOMSVGPointList::GetDOMWrapperIfExists(GetAnimValKey());
+  if (domWrapper) {
+    // When all animation ends, animVal simply mirrors baseVal, which may have
+    // a different number of items to the last active animated value.
+    //
+    domWrapper->InternalListWillChangeTo(mBaseVal);
+  }
+  mAnimVal = nullptr;
+  aElement->DidAnimatePointList();
+}
+
+UniquePtr<SMILAttr> SVGAnimatedPointList::ToSMILAttr(SVGElement* aElement) {
+  return MakeUnique<SMILAnimatedPointList>(this, aElement);
+}
+
+nsresult SVGAnimatedPointList::SMILAnimatedPointList::ValueFromString(
+    const nsAString& aStr, const dom::SVGAnimationElement* /*aSrcElement*/,
+    SMILValue& aValue, bool& aPreventCachingOfSandwich) const {
+  SMILValue val(&SVGPointListSMILType::sSingleton);
+  SVGPointListAndInfo* list = static_cast<SVGPointListAndInfo*>(val.mU.mPtr);
+  nsresult rv = list->SetValueFromString(aStr);
+  if (NS_SUCCEEDED(rv)) {
+    list->SetInfo(mElement);
+    aValue = std::move(val);
+  }
+  return rv;
+}
+
+SMILValue SVGAnimatedPointList::SMILAnimatedPointList::GetBaseValue() const {
+  // To benefit from Return Value Optimization and avoid copy constructor calls
+  // due to our use of return-by-value, we must return the exact same object
+  // from ALL return points. This function must only return THIS variable:
+  SMILValue val;
+
+  SMILValue tmp(&SVGPointListSMILType::sSingleton);
+  auto* list = static_cast<SVGPointListAndInfo*>(tmp.mU.mPtr);
+  nsresult rv = list->CopyFrom(mVal->mBaseVal);
+  if (NS_SUCCEEDED(rv)) {
+    list->SetInfo(mElement);
+    std::swap(val, tmp);
+  }
+  return val;
+}
+
+nsresult SVGAnimatedPointList::SMILAnimatedPointList::SetAnimValue(
+    const SMILValue& aValue) {
+  NS_ASSERTION(aValue.mType == &SVGPointListSMILType::sSingleton,
+               "Unexpected type to assign animated value");
+  if (aValue.mType == &SVGPointListSMILType::sSingleton) {
+    mVal->SetAnimValue(*static_cast<SVGPointListAndInfo*>(aValue.mU.mPtr),
+                       mElement);
+  }
+  return NS_OK;
+}
+
+void SVGAnimatedPointList::SMILAnimatedPointList::ClearAnimValue() {
+  if (mVal->mAnimVal) {
+    mVal->ClearAnimValue(mElement);
+  }
+}
+
+}  // namespace mozilla