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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /dom/svg/DOMSVGPointList.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'dom/svg/DOMSVGPointList.cpp')
-rw-r--r--dom/svg/DOMSVGPointList.cpp479
1 files changed, 479 insertions, 0 deletions
diff --git a/dom/svg/DOMSVGPointList.cpp b/dom/svg/DOMSVGPointList.cpp
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+++ b/dom/svg/DOMSVGPointList.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 "nsSVGElement.h"
+#include "DOMSVGPointList.h"
+#include "DOMSVGPoint.h"
+#include "nsError.h"
+#include "SVGAnimatedPointList.h"
+#include "nsCOMPtr.h"
+#include "nsSVGAttrTearoffTable.h"
+#include "nsContentUtils.h"
+#include "mozilla/dom/SVGPointListBinding.h"
+#include <algorithm>
+
+// See the comment in this file's header.
+
+// local helper functions
+namespace {
+
+void
+UpdateListIndicesFromIndex(FallibleTArray<mozilla::nsISVGPoint*>& aItemsArray,
+ uint32_t aStartingIndex)
+{
+ uint32_t length = aItemsArray.Length();
+
+ for (uint32_t i = aStartingIndex; i < length; ++i) {
+ if (aItemsArray[i]) {
+ aItemsArray[i]->UpdateListIndex(i);
+ }
+ }
+}
+
+} // namespace
+
+namespace mozilla {
+
+ static inline
+nsSVGAttrTearoffTable<void, DOMSVGPointList>&
+SVGPointListTearoffTable()
+{
+ static nsSVGAttrTearoffTable<void, DOMSVGPointList>
+ sSVGPointListTearoffTable;
+ return sSVGPointListTearoffTable;
+}
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(DOMSVGPointList)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(DOMSVGPointList)
+ // No unlinking of mElement, we'd need to null out the value pointer (the
+ // object it points to is held by the element) and null-check it everywhere.
+ NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(DOMSVGPointList)
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mElement)
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(DOMSVGPointList)
+ NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
+NS_IMPL_CYCLE_COLLECTION_TRACE_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(DOMSVGPointList)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(DOMSVGPointList)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DOMSVGPointList)
+ NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+ NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+//----------------------------------------------------------------------
+// Helper class: AutoChangePointListNotifier
+// Stack-based helper class to pair calls to WillChangePointList and
+// DidChangePointList.
+class MOZ_RAII AutoChangePointListNotifier
+{
+public:
+ explicit AutoChangePointListNotifier(DOMSVGPointList* aPointList MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
+ : mPointList(aPointList)
+ {
+ MOZ_GUARD_OBJECT_NOTIFIER_INIT;
+ MOZ_ASSERT(mPointList, "Expecting non-null pointList");
+ mEmptyOrOldValue =
+ mPointList->Element()->WillChangePointList();
+ }
+
+ ~AutoChangePointListNotifier()
+ {
+ mPointList->Element()->DidChangePointList(mEmptyOrOldValue);
+ if (mPointList->AttrIsAnimating()) {
+ mPointList->Element()->AnimationNeedsResample();
+ }
+ }
+
+private:
+ DOMSVGPointList* const mPointList;
+ nsAttrValue mEmptyOrOldValue;
+ MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
+};
+
+
+/* static */ already_AddRefed<DOMSVGPointList>
+DOMSVGPointList::GetDOMWrapper(void *aList,
+ nsSVGElement *aElement,
+ bool aIsAnimValList)
+{
+ RefPtr<DOMSVGPointList> wrapper =
+ SVGPointListTearoffTable().GetTearoff(aList);
+ if (!wrapper) {
+ wrapper = new DOMSVGPointList(aElement, aIsAnimValList);
+ SVGPointListTearoffTable().AddTearoff(aList, wrapper);
+ }
+ return wrapper.forget();
+}
+
+/* static */ DOMSVGPointList*
+DOMSVGPointList::GetDOMWrapperIfExists(void *aList)
+{
+ return SVGPointListTearoffTable().GetTearoff(aList);
+}
+
+DOMSVGPointList::~DOMSVGPointList()
+{
+ // There are now no longer any references to us held by script or list items.
+ // Note we must use GetAnimValKey/GetBaseValKey here, NOT InternalList()!
+ void *key = mIsAnimValList ?
+ InternalAList().GetAnimValKey() :
+ InternalAList().GetBaseValKey();
+ SVGPointListTearoffTable().RemoveTearoff(key);
+}
+
+JSObject*
+DOMSVGPointList::WrapObject(JSContext *cx, JS::Handle<JSObject*> aGivenProto)
+{
+ return mozilla::dom::SVGPointListBinding::Wrap(cx, this, aGivenProto);
+}
+
+void
+DOMSVGPointList::InternalListWillChangeTo(const SVGPointList& aNewValue)
+{
+ // When the number of items in our internal counterpart changes, we MUST stay
+ // in sync. Everything in the scary comment in
+ // DOMSVGLengthList::InternalBaseValListWillChangeTo applies here too!
+
+ uint32_t oldLength = mItems.Length();
+
+ uint32_t newLength = aNewValue.Length();
+ if (newLength > nsISVGPoint::MaxListIndex()) {
+ // It's safe to get out of sync with our internal list as long as we have
+ // FEWER items than it does.
+ newLength = nsISVGPoint::MaxListIndex();
+ }
+
+ RefPtr<DOMSVGPointList> kungFuDeathGrip;
+ if (newLength < oldLength) {
+ // RemovingFromList() might clear last reference to |this|.
+ // Retain a temporary reference to keep from dying before returning.
+ kungFuDeathGrip = this;
+ }
+
+ // If our length will decrease, notify the items that will be removed:
+ for (uint32_t i = newLength; i < oldLength; ++i) {
+ if (mItems[i]) {
+ mItems[i]->RemovingFromList();
+ }
+ }
+
+ if (!mItems.SetLength(newLength, fallible)) {
+ // We silently ignore SetLength OOM failure since being out of sync is safe
+ // so long as we have *fewer* items than our internal list.
+ mItems.Clear();
+ return;
+ }
+
+ // If our length has increased, null out the new pointers:
+ for (uint32_t i = oldLength; i < newLength; ++i) {
+ mItems[i] = nullptr;
+ }
+}
+
+bool
+DOMSVGPointList::AttrIsAnimating() const
+{
+ return InternalAList().IsAnimating();
+}
+
+bool
+DOMSVGPointList::AnimListMirrorsBaseList() const
+{
+ return GetDOMWrapperIfExists(InternalAList().GetAnimValKey()) &&
+ !AttrIsAnimating();
+}
+
+SVGPointList&
+DOMSVGPointList::InternalList() const
+{
+ SVGAnimatedPointList *alist = mElement->GetAnimatedPointList();
+ return mIsAnimValList && alist->IsAnimating() ? *alist->mAnimVal : alist->mBaseVal;
+}
+
+SVGAnimatedPointList&
+DOMSVGPointList::InternalAList() const
+{
+ MOZ_ASSERT(mElement->GetAnimatedPointList(), "Internal error");
+ return *mElement->GetAnimatedPointList();
+}
+
+// ----------------------------------------------------------------------------
+// nsIDOMSVGPointList implementation:
+
+void
+DOMSVGPointList::Clear(ErrorResult& aError)
+{
+ if (IsAnimValList()) {
+ aError.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
+ return;
+ }
+
+ if (LengthNoFlush() > 0) {
+ AutoChangePointListNotifier notifier(this);
+ // DOM list items that are to be removed must be removed before we change
+ // the internal list, otherwise they wouldn't be able to copy their
+ // internal counterparts' values!
+
+ InternalListWillChangeTo(SVGPointList()); // clears mItems
+
+ if (!AttrIsAnimating()) {
+ // The anim val list is in sync with the base val list
+ DOMSVGPointList *animList =
+ GetDOMWrapperIfExists(InternalAList().GetAnimValKey());
+ if (animList) {
+ animList->InternalListWillChangeTo(SVGPointList()); // clears its mItems
+ }
+ }
+
+ InternalList().Clear();
+ }
+}
+
+already_AddRefed<nsISVGPoint>
+DOMSVGPointList::Initialize(nsISVGPoint& aNewItem, ErrorResult& aError)
+{
+ if (IsAnimValList()) {
+ aError.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
+ return nullptr;
+ }
+
+ // If aNewItem is already in a list we should insert a clone of aNewItem,
+ // and for consistency, this should happen even if *this* is the list that
+ // aNewItem is currently in. Note that in the case of aNewItem being in this
+ // list, the Clear() call before the InsertItemBefore() call would remove it
+ // from this list, and so the InsertItemBefore() call would not insert a
+ // clone of aNewItem, it would actually insert aNewItem. To prevent that
+ // from happening we have to do the clone here, if necessary.
+
+ nsCOMPtr<nsISVGPoint> domItem = &aNewItem;
+ if (domItem->HasOwner() || domItem->IsReadonly() ||
+ domItem->IsTranslatePoint()) {
+ domItem = domItem->Copy(); // must do this before changing anything!
+ }
+
+ ErrorResult rv;
+ Clear(rv);
+ MOZ_ASSERT(!rv.Failed());
+ return InsertItemBefore(*domItem, 0, aError);
+}
+
+already_AddRefed<nsISVGPoint>
+DOMSVGPointList::GetItem(uint32_t index, ErrorResult& error)
+{
+ bool found;
+ RefPtr<nsISVGPoint> item = IndexedGetter(index, found, error);
+ if (!found) {
+ error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
+ }
+ return item.forget();
+}
+
+already_AddRefed<nsISVGPoint>
+DOMSVGPointList::IndexedGetter(uint32_t aIndex, bool& aFound,
+ ErrorResult& aError)
+{
+ if (IsAnimValList()) {
+ Element()->FlushAnimations();
+ }
+ aFound = aIndex < LengthNoFlush();
+ if (aFound) {
+ return GetItemAt(aIndex);
+ }
+ return nullptr;
+}
+
+already_AddRefed<nsISVGPoint>
+DOMSVGPointList::InsertItemBefore(nsISVGPoint& aNewItem, uint32_t aIndex,
+ ErrorResult& aError)
+{
+ if (IsAnimValList()) {
+ aError.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
+ return nullptr;
+ }
+
+ aIndex = std::min(aIndex, LengthNoFlush());
+ if (aIndex >= nsISVGPoint::MaxListIndex()) {
+ aError.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
+ return nullptr;
+ }
+
+ nsCOMPtr<nsISVGPoint> domItem = &aNewItem;
+ if (domItem->HasOwner() || domItem->IsReadonly() ||
+ domItem->IsTranslatePoint()) {
+ domItem = domItem->Copy(); // must do this before changing anything!
+ }
+
+ // Ensure we have enough memory so we can avoid complex error handling below:
+ if (!mItems.SetCapacity(mItems.Length() + 1, fallible) ||
+ !InternalList().SetCapacity(InternalList().Length() + 1)) {
+ aError.Throw(NS_ERROR_OUT_OF_MEMORY);
+ return nullptr;
+ }
+ if (AnimListMirrorsBaseList()) {
+ DOMSVGPointList *animVal =
+ GetDOMWrapperIfExists(InternalAList().GetAnimValKey());
+ MOZ_ASSERT(animVal, "animVal must be a valid pointer");
+ if (!animVal->mItems.SetCapacity(
+ animVal->mItems.Length() + 1, fallible)) {
+ aError.Throw(NS_ERROR_OUT_OF_MEMORY);
+ return nullptr;
+ }
+ }
+
+ AutoChangePointListNotifier notifier(this);
+ // Now that we know we're inserting, keep animVal list in sync as necessary.
+ MaybeInsertNullInAnimValListAt(aIndex);
+
+ InternalList().InsertItem(aIndex, domItem->ToSVGPoint());
+ MOZ_ALWAYS_TRUE(mItems.InsertElementAt(aIndex, domItem, fallible));
+
+ // This MUST come after the insertion into InternalList(), or else under the
+ // insertion into InternalList() the values read from domItem would be bad
+ // data from InternalList() itself!:
+ domItem->InsertingIntoList(this, aIndex, IsAnimValList());
+
+ UpdateListIndicesFromIndex(mItems, aIndex + 1);
+
+ return domItem.forget();
+}
+
+already_AddRefed<nsISVGPoint>
+DOMSVGPointList::ReplaceItem(nsISVGPoint& aNewItem, uint32_t aIndex,
+ ErrorResult& aError)
+{
+ if (IsAnimValList()) {
+ aError.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
+ return nullptr;
+ }
+
+ if (aIndex >= LengthNoFlush()) {
+ aError.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
+ return nullptr;
+ }
+
+ nsCOMPtr<nsISVGPoint> domItem = &aNewItem;
+ if (domItem->HasOwner() || domItem->IsReadonly() ||
+ domItem->IsTranslatePoint()) {
+ domItem = domItem->Copy(); // must do this before changing anything!
+ }
+
+ AutoChangePointListNotifier notifier(this);
+ if (mItems[aIndex]) {
+ // Notify any existing DOM item of removal *before* modifying the lists so
+ // that the DOM item can copy the *old* value at its index:
+ mItems[aIndex]->RemovingFromList();
+ }
+
+ InternalList()[aIndex] = domItem->ToSVGPoint();
+ mItems[aIndex] = domItem;
+
+ // This MUST come after the ToSVGPoint() call, otherwise that call
+ // would end up reading bad data from InternalList()!
+ domItem->InsertingIntoList(this, aIndex, IsAnimValList());
+
+ return domItem.forget();
+}
+
+already_AddRefed<nsISVGPoint>
+DOMSVGPointList::RemoveItem(uint32_t aIndex, ErrorResult& aError)
+{
+ if (IsAnimValList()) {
+ aError.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
+ return nullptr;
+ }
+
+ if (aIndex >= LengthNoFlush()) {
+ aError.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
+ return nullptr;
+ }
+
+ AutoChangePointListNotifier notifier(this);
+ // Now that we know we're removing, keep animVal list in sync as necessary.
+ // Do this *before* touching InternalList() so the removed item can get its
+ // internal value.
+ MaybeRemoveItemFromAnimValListAt(aIndex);
+
+ // We have to return the removed item, so get it, creating it if necessary:
+ RefPtr<nsISVGPoint> result = GetItemAt(aIndex);
+
+ // Notify the DOM item of removal *before* modifying the lists so that the
+ // DOM item can copy its *old* value:
+ mItems[aIndex]->RemovingFromList();
+
+ InternalList().RemoveItem(aIndex);
+ mItems.RemoveElementAt(aIndex);
+
+ UpdateListIndicesFromIndex(mItems, aIndex);
+
+ return result.forget();
+}
+
+already_AddRefed<nsISVGPoint>
+DOMSVGPointList::GetItemAt(uint32_t aIndex)
+{
+ MOZ_ASSERT(aIndex < mItems.Length());
+
+ if (!mItems[aIndex]) {
+ mItems[aIndex] = new DOMSVGPoint(this, aIndex, IsAnimValList());
+ }
+ RefPtr<nsISVGPoint> result = mItems[aIndex];
+ return result.forget();
+}
+
+void
+DOMSVGPointList::MaybeInsertNullInAnimValListAt(uint32_t aIndex)
+{
+ MOZ_ASSERT(!IsAnimValList(), "call from baseVal to animVal");
+
+ if (!AnimListMirrorsBaseList()) {
+ return;
+ }
+
+ // The anim val list is in sync with the base val list
+ DOMSVGPointList *animVal =
+ GetDOMWrapperIfExists(InternalAList().GetAnimValKey());
+
+ MOZ_ASSERT(animVal, "AnimListMirrorsBaseList() promised a non-null animVal");
+ MOZ_ASSERT(animVal->mItems.Length() == mItems.Length(),
+ "animVal list not in sync!");
+ MOZ_ALWAYS_TRUE(animVal->mItems.InsertElementAt(aIndex, nullptr, fallible));
+
+ UpdateListIndicesFromIndex(animVal->mItems, aIndex + 1);
+}
+
+void
+DOMSVGPointList::MaybeRemoveItemFromAnimValListAt(uint32_t aIndex)
+{
+ MOZ_ASSERT(!IsAnimValList(), "call from baseVal to animVal");
+
+ if (!AnimListMirrorsBaseList()) {
+ return;
+ }
+
+ // This needs to be a strong reference; otherwise, the RemovingFromList call
+ // below might drop the last reference to animVal before we're done with it.
+ RefPtr<DOMSVGPointList> animVal =
+ GetDOMWrapperIfExists(InternalAList().GetAnimValKey());
+
+ MOZ_ASSERT(animVal, "AnimListMirrorsBaseList() promised a non-null animVal");
+ MOZ_ASSERT(animVal->mItems.Length() == mItems.Length(),
+ "animVal list not in sync!");
+
+ if (animVal->mItems[aIndex]) {
+ animVal->mItems[aIndex]->RemovingFromList();
+ }
+ animVal->mItems.RemoveElementAt(aIndex);
+
+ UpdateListIndicesFromIndex(animVal->mItems, aIndex);
+}
+
+} // namespace mozilla