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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/DOMSVGTransformList.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'dom/svg/DOMSVGTransformList.cpp')
-rw-r--r--dom/svg/DOMSVGTransformList.cpp445
1 files changed, 445 insertions, 0 deletions
diff --git a/dom/svg/DOMSVGTransformList.cpp b/dom/svg/DOMSVGTransformList.cpp
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+++ b/dom/svg/DOMSVGTransformList.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 "DOMSVGTransformList.h"
+#include "mozilla/dom/SVGTransform.h"
+#include "mozilla/dom/SVGMatrix.h"
+#include "nsSVGAnimatedTransformList.h"
+#include "nsSVGElement.h"
+#include "mozilla/dom/SVGTransformListBinding.h"
+#include "nsError.h"
+#include <algorithm>
+
+// local helper functions
+namespace {
+
+void UpdateListIndicesFromIndex(
+ FallibleTArray<mozilla::dom::SVGTransform*>& 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 {
+
+using namespace dom;
+
+// We could use NS_IMPL_CYCLE_COLLECTION(, except that in Unlink() we need to
+// clear our SVGAnimatedTransformList's weak ref to us to be safe. (The other
+// option would be to not unlink and rely on the breaking of the other edges in
+// the cycle, as NS_SVG_VAL_IMPL_CYCLE_COLLECTION does.)
+NS_IMPL_CYCLE_COLLECTION_CLASS(DOMSVGTransformList)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(DOMSVGTransformList)
+ if (tmp->mAList) {
+ if (tmp->IsAnimValList()) {
+ tmp->mAList->mAnimVal = nullptr;
+ } else {
+ tmp->mAList->mBaseVal = nullptr;
+ }
+ NS_IMPL_CYCLE_COLLECTION_UNLINK(mAList)
+ }
+ NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(DOMSVGTransformList)
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAList)
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(DOMSVGTransformList)
+ NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
+NS_IMPL_CYCLE_COLLECTION_TRACE_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(DOMSVGTransformList)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(DOMSVGTransformList)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DOMSVGTransformList)
+ NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+ NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+//----------------------------------------------------------------------
+// DOMSVGTransformList methods:
+
+JSObject*
+DOMSVGTransformList::WrapObject(JSContext *cx, JS::Handle<JSObject*> aGivenProto)
+{
+ return mozilla::dom::SVGTransformListBinding::Wrap(cx, this, aGivenProto);
+}
+
+//----------------------------------------------------------------------
+// Helper class: AutoChangeTransformListNotifier
+// Stack-based helper class to pair calls to WillChangeTransformList and
+// DidChangeTransformList.
+class MOZ_RAII AutoChangeTransformListNotifier
+{
+public:
+ explicit AutoChangeTransformListNotifier(DOMSVGTransformList* aTransformList MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
+ : mTransformList(aTransformList)
+ {
+ MOZ_GUARD_OBJECT_NOTIFIER_INIT;
+ MOZ_ASSERT(mTransformList, "Expecting non-null transformList");
+ mEmptyOrOldValue =
+ mTransformList->Element()->WillChangeTransformList();
+ }
+
+ ~AutoChangeTransformListNotifier()
+ {
+ mTransformList->Element()->DidChangeTransformList(mEmptyOrOldValue);
+ if (mTransformList->IsAnimating()) {
+ mTransformList->Element()->AnimationNeedsResample();
+ }
+ }
+
+private:
+ DOMSVGTransformList* const mTransformList;
+ nsAttrValue mEmptyOrOldValue;
+ MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
+};
+
+void
+DOMSVGTransformList::InternalListLengthWillChange(uint32_t aNewLength)
+{
+ uint32_t oldLength = mItems.Length();
+
+ if (aNewLength > SVGTransform::MaxListIndex()) {
+ // It's safe to get out of sync with our internal list as long as we have
+ // FEWER items than it does.
+ aNewLength = SVGTransform::MaxListIndex();
+ }
+
+ RefPtr<DOMSVGTransformList> kungFuDeathGrip;
+ if (aNewLength < 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 = aNewLength; i < oldLength; ++i) {
+ if (mItems[i]) {
+ mItems[i]->RemovingFromList();
+ }
+ }
+
+ if (!mItems.SetLength(aNewLength, 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 < aNewLength; ++i) {
+ mItems[i] = nullptr;
+ }
+}
+
+SVGTransformList&
+DOMSVGTransformList::InternalList() const
+{
+ nsSVGAnimatedTransformList *alist = Element()->GetAnimatedTransformList();
+ return IsAnimValList() && alist->mAnimVal ?
+ *alist->mAnimVal :
+ alist->mBaseVal;
+}
+
+//----------------------------------------------------------------------
+void
+DOMSVGTransformList::Clear(ErrorResult& error)
+{
+ if (IsAnimValList()) {
+ error.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
+ return;
+ }
+
+ if (LengthNoFlush() > 0) {
+ AutoChangeTransformListNotifier notifier(this);
+ // Notify any existing DOM items of removal *before* truncating the lists
+ // so that they can find their SVGTransform internal counterparts and copy
+ // their values. This also notifies the animVal list:
+ mAList->InternalBaseValListWillChangeLengthTo(0);
+
+ mItems.Clear();
+ InternalList().Clear();
+ }
+}
+
+already_AddRefed<SVGTransform>
+DOMSVGTransformList::Initialize(SVGTransform& newItem, ErrorResult& error)
+{
+ if (IsAnimValList()) {
+ error.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
+ return nullptr;
+ }
+
+ // If newItem is already in a list we should insert a clone of newItem, and
+ // for consistency, this should happen even if *this* is the list that
+ // newItem is currently in. Note that in the case of newItem 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 newItem, it would actually insert newItem. To prevent that from
+ // happening we have to do the clone here, if necessary.
+
+ RefPtr<SVGTransform> domItem = &newItem;
+ if (domItem->HasOwner()) {
+ domItem = newItem.Clone();
+ }
+
+ Clear(error);
+ MOZ_ASSERT(!error.Failed(), "How could this fail?");
+ return InsertItemBefore(*domItem, 0, error);
+}
+
+already_AddRefed<SVGTransform>
+DOMSVGTransformList::GetItem(uint32_t index, ErrorResult& error)
+{
+ bool found;
+ RefPtr<SVGTransform> item = IndexedGetter(index, found, error);
+ if (!found) {
+ error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
+ }
+ return item.forget();
+}
+
+already_AddRefed<SVGTransform>
+DOMSVGTransformList::IndexedGetter(uint32_t index, bool& found,
+ ErrorResult& error)
+{
+ if (IsAnimValList()) {
+ Element()->FlushAnimations();
+ }
+ found = index < LengthNoFlush();
+ if (found) {
+ return GetItemAt(index);
+ }
+ return nullptr;
+}
+
+already_AddRefed<SVGTransform>
+DOMSVGTransformList::InsertItemBefore(SVGTransform& newItem,
+ uint32_t index, ErrorResult& error)
+{
+ if (IsAnimValList()) {
+ error.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
+ return nullptr;
+ }
+
+ index = std::min(index, LengthNoFlush());
+ if (index >= SVGTransform::MaxListIndex()) {
+ error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
+ return nullptr;
+ }
+
+ RefPtr<SVGTransform> domItem = &newItem;
+ if (newItem.HasOwner()) {
+ domItem = newItem.Clone(); // 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)) {
+ error.Throw(NS_ERROR_OUT_OF_MEMORY);
+ return nullptr;
+ }
+ if (AnimListMirrorsBaseList()) {
+ if (!mAList->mAnimVal->mItems.SetCapacity(
+ mAList->mAnimVal->mItems.Length() + 1, fallible)) {
+ error.Throw(NS_ERROR_OUT_OF_MEMORY);
+ return nullptr;
+ }
+ }
+
+ AutoChangeTransformListNotifier notifier(this);
+ // Now that we know we're inserting, keep animVal list in sync as necessary.
+ MaybeInsertNullInAnimValListAt(index);
+
+ InternalList().InsertItem(index, domItem->ToSVGTransform());
+ MOZ_ALWAYS_TRUE(mItems.InsertElementAt(index, domItem.get(), 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, index, IsAnimValList());
+
+ UpdateListIndicesFromIndex(mItems, index + 1);
+
+ return domItem.forget();
+}
+
+already_AddRefed<SVGTransform>
+DOMSVGTransformList::ReplaceItem(SVGTransform& newItem,
+ uint32_t index, ErrorResult& error)
+{
+ if (IsAnimValList()) {
+ error.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
+ return nullptr;
+ }
+
+ if (index >= LengthNoFlush()) {
+ error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
+ return nullptr;
+ }
+
+ RefPtr<SVGTransform> domItem = &newItem;
+ if (newItem.HasOwner()) {
+ domItem = newItem.Clone(); // must do this before changing anything!
+ }
+
+ AutoChangeTransformListNotifier notifier(this);
+ if (mItems[index]) {
+ // 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[index]->RemovingFromList();
+ }
+
+ InternalList()[index] = domItem->ToSVGTransform();
+ mItems[index] = domItem;
+
+ // This MUST come after the ToSVGPoint() call, otherwise that call
+ // would end up reading bad data from InternalList()!
+ domItem->InsertingIntoList(this, index, IsAnimValList());
+
+ return domItem.forget();
+}
+
+already_AddRefed<SVGTransform>
+DOMSVGTransformList::RemoveItem(uint32_t index, ErrorResult& error)
+{
+ if (IsAnimValList()) {
+ error.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
+ return nullptr;
+ }
+
+ if (index >= LengthNoFlush()) {
+ error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
+ return nullptr;
+ }
+
+ AutoChangeTransformListNotifier 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(index);
+
+ // We have to return the removed item, so get it, creating it if necessary:
+ RefPtr<SVGTransform> result = GetItemAt(index);
+
+ // Notify the DOM item of removal *before* modifying the lists so that the
+ // DOM item can copy its *old* value:
+ result->RemovingFromList();
+
+ InternalList().RemoveItem(index);
+ mItems.RemoveElementAt(index);
+
+ UpdateListIndicesFromIndex(mItems, index);
+
+ return result.forget();
+}
+
+already_AddRefed<SVGTransform>
+DOMSVGTransformList::CreateSVGTransformFromMatrix(dom::SVGMatrix& matrix)
+{
+ RefPtr<SVGTransform> result = new SVGTransform(matrix.GetMatrix());
+ return result.forget();
+}
+
+already_AddRefed<SVGTransform>
+DOMSVGTransformList::Consolidate(ErrorResult& error)
+{
+ if (IsAnimValList()) {
+ error.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
+ return nullptr;
+ }
+
+ if (LengthNoFlush() == 0) {
+ return nullptr;
+ }
+
+ // Note that SVG 1.1 says, "The consolidation operation creates new
+ // SVGTransform object as the first and only item in the list" hence, even if
+ // LengthNoFlush() == 1 we can't return that one item (after making it a
+ // matrix type). We must orphan the existing item and then make a new one.
+
+ // First calculate our matrix
+ gfxMatrix mx = InternalList().GetConsolidationMatrix();
+
+ // Then orphan the existing items
+ Clear(error);
+ MOZ_ASSERT(!error.Failed(), "How could this fail?");
+
+ // And append the new transform
+ RefPtr<SVGTransform> transform = new SVGTransform(mx);
+ return InsertItemBefore(*transform, LengthNoFlush(), error);
+}
+
+//----------------------------------------------------------------------
+// Implementation helpers:
+
+already_AddRefed<SVGTransform>
+DOMSVGTransformList::GetItemAt(uint32_t aIndex)
+{
+ MOZ_ASSERT(aIndex < mItems.Length());
+
+ if (!mItems[aIndex]) {
+ mItems[aIndex] = new SVGTransform(this, aIndex, IsAnimValList());
+ }
+ RefPtr<SVGTransform> result = mItems[aIndex];
+ return result.forget();
+}
+
+void
+DOMSVGTransformList::MaybeInsertNullInAnimValListAt(uint32_t aIndex)
+{
+ MOZ_ASSERT(!IsAnimValList(), "call from baseVal to animVal");
+
+ if (!AnimListMirrorsBaseList()) {
+ return;
+ }
+
+ DOMSVGTransformList* animVal = mAList->mAnimVal;
+
+ 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
+DOMSVGTransformList::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<DOMSVGTransformList> animVal = mAList->mAnimVal;
+
+ 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