mirror of
https://github.com/classilla/tenfourfox.git
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480 lines
14 KiB
C++
480 lines
14 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsSVGElement.h"
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#include "DOMSVGPointList.h"
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#include "DOMSVGPoint.h"
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#include "nsError.h"
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#include "SVGAnimatedPointList.h"
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#include "nsCOMPtr.h"
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#include "nsSVGAttrTearoffTable.h"
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#include "nsContentUtils.h"
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#include "mozilla/dom/SVGPointListBinding.h"
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#include <algorithm>
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// See the comment in this file's header.
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// local helper functions
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namespace {
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void
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UpdateListIndicesFromIndex(FallibleTArray<mozilla::nsISVGPoint*>& aItemsArray,
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uint32_t aStartingIndex)
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{
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uint32_t length = aItemsArray.Length();
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for (uint32_t i = aStartingIndex; i < length; ++i) {
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if (aItemsArray[i]) {
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aItemsArray[i]->UpdateListIndex(i);
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}
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}
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}
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} // namespace
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namespace mozilla {
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static inline
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nsSVGAttrTearoffTable<void, DOMSVGPointList>&
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SVGPointListTearoffTable()
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{
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static nsSVGAttrTearoffTable<void, DOMSVGPointList>
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sSVGPointListTearoffTable;
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return sSVGPointListTearoffTable;
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}
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NS_IMPL_CYCLE_COLLECTION_CLASS(DOMSVGPointList)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(DOMSVGPointList)
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// No unlinking of mElement, we'd need to null out the value pointer (the
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// object it points to is held by the element) and null-check it everywhere.
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NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(DOMSVGPointList)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mElement)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(DOMSVGPointList)
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NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
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NS_IMPL_CYCLE_COLLECTION_TRACE_END
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NS_IMPL_CYCLE_COLLECTING_ADDREF(DOMSVGPointList)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(DOMSVGPointList)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DOMSVGPointList)
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NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
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NS_INTERFACE_MAP_ENTRY(nsISupports)
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NS_INTERFACE_MAP_END
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//----------------------------------------------------------------------
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// Helper class: AutoChangePointListNotifier
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// Stack-based helper class to pair calls to WillChangePointList and
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// DidChangePointList.
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class MOZ_RAII AutoChangePointListNotifier
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{
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public:
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explicit AutoChangePointListNotifier(DOMSVGPointList* aPointList MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
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: mPointList(aPointList)
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{
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MOZ_GUARD_OBJECT_NOTIFIER_INIT;
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MOZ_ASSERT(mPointList, "Expecting non-null pointList");
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mEmptyOrOldValue =
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mPointList->Element()->WillChangePointList();
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}
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~AutoChangePointListNotifier()
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{
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mPointList->Element()->DidChangePointList(mEmptyOrOldValue);
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if (mPointList->AttrIsAnimating()) {
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mPointList->Element()->AnimationNeedsResample();
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}
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}
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private:
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DOMSVGPointList* const mPointList;
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nsAttrValue mEmptyOrOldValue;
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MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
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};
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/* static */ already_AddRefed<DOMSVGPointList>
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DOMSVGPointList::GetDOMWrapper(void *aList,
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nsSVGElement *aElement,
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bool aIsAnimValList)
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{
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RefPtr<DOMSVGPointList> wrapper =
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SVGPointListTearoffTable().GetTearoff(aList);
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if (!wrapper) {
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wrapper = new DOMSVGPointList(aElement, aIsAnimValList);
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SVGPointListTearoffTable().AddTearoff(aList, wrapper);
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}
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return wrapper.forget();
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}
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/* static */ DOMSVGPointList*
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DOMSVGPointList::GetDOMWrapperIfExists(void *aList)
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{
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return SVGPointListTearoffTable().GetTearoff(aList);
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}
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DOMSVGPointList::~DOMSVGPointList()
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{
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// There are now no longer any references to us held by script or list items.
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// Note we must use GetAnimValKey/GetBaseValKey here, NOT InternalList()!
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void *key = mIsAnimValList ?
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InternalAList().GetAnimValKey() :
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InternalAList().GetBaseValKey();
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SVGPointListTearoffTable().RemoveTearoff(key);
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}
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JSObject*
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DOMSVGPointList::WrapObject(JSContext *cx, JS::Handle<JSObject*> aGivenProto)
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{
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return mozilla::dom::SVGPointListBinding::Wrap(cx, this, aGivenProto);
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}
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void
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DOMSVGPointList::InternalListWillChangeTo(const SVGPointList& aNewValue)
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{
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// When the number of items in our internal counterpart changes, we MUST stay
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// in sync. Everything in the scary comment in
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// DOMSVGLengthList::InternalBaseValListWillChangeTo applies here too!
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uint32_t oldLength = mItems.Length();
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uint32_t newLength = aNewValue.Length();
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if (newLength > nsISVGPoint::MaxListIndex()) {
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// It's safe to get out of sync with our internal list as long as we have
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// FEWER items than it does.
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newLength = nsISVGPoint::MaxListIndex();
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}
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RefPtr<DOMSVGPointList> kungFuDeathGrip;
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if (newLength < oldLength) {
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// RemovingFromList() might clear last reference to |this|.
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// Retain a temporary reference to keep from dying before returning.
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kungFuDeathGrip = this;
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}
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// If our length will decrease, notify the items that will be removed:
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for (uint32_t i = newLength; i < oldLength; ++i) {
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if (mItems[i]) {
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mItems[i]->RemovingFromList();
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}
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}
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if (!mItems.SetLength(newLength, fallible)) {
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// We silently ignore SetLength OOM failure since being out of sync is safe
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// so long as we have *fewer* items than our internal list.
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mItems.Clear();
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return;
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}
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// If our length has increased, null out the new pointers:
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for (uint32_t i = oldLength; i < newLength; ++i) {
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mItems[i] = nullptr;
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}
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}
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bool
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DOMSVGPointList::AttrIsAnimating() const
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{
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return InternalAList().IsAnimating();
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}
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bool
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DOMSVGPointList::AnimListMirrorsBaseList() const
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{
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return GetDOMWrapperIfExists(InternalAList().GetAnimValKey()) &&
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!AttrIsAnimating();
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}
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SVGPointList&
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DOMSVGPointList::InternalList() const
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{
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SVGAnimatedPointList *alist = mElement->GetAnimatedPointList();
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return mIsAnimValList && alist->IsAnimating() ? *alist->mAnimVal : alist->mBaseVal;
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}
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SVGAnimatedPointList&
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DOMSVGPointList::InternalAList() const
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{
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MOZ_ASSERT(mElement->GetAnimatedPointList(), "Internal error");
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return *mElement->GetAnimatedPointList();
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}
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// ----------------------------------------------------------------------------
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// nsIDOMSVGPointList implementation:
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void
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DOMSVGPointList::Clear(ErrorResult& aError)
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{
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if (IsAnimValList()) {
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aError.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
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return;
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}
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if (LengthNoFlush() > 0) {
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AutoChangePointListNotifier notifier(this);
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// DOM list items that are to be removed must be removed before we change
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// the internal list, otherwise they wouldn't be able to copy their
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// internal counterparts' values!
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InternalListWillChangeTo(SVGPointList()); // clears mItems
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if (!AttrIsAnimating()) {
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// The anim val list is in sync with the base val list
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DOMSVGPointList *animList =
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GetDOMWrapperIfExists(InternalAList().GetAnimValKey());
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if (animList) {
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animList->InternalListWillChangeTo(SVGPointList()); // clears its mItems
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}
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}
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InternalList().Clear();
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}
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}
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already_AddRefed<nsISVGPoint>
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DOMSVGPointList::Initialize(nsISVGPoint& aNewItem, ErrorResult& aError)
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{
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if (IsAnimValList()) {
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aError.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
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return nullptr;
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}
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// If aNewItem is already in a list we should insert a clone of aNewItem,
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// and for consistency, this should happen even if *this* is the list that
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// aNewItem is currently in. Note that in the case of aNewItem being in this
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// list, the Clear() call before the InsertItemBefore() call would remove it
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// from this list, and so the InsertItemBefore() call would not insert a
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// clone of aNewItem, it would actually insert aNewItem. To prevent that
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// from happening we have to do the clone here, if necessary.
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nsCOMPtr<nsISVGPoint> domItem = &aNewItem;
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if (domItem->HasOwner() || domItem->IsReadonly() ||
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domItem->IsTranslatePoint()) {
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domItem = domItem->Copy(); // must do this before changing anything!
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}
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ErrorResult rv;
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Clear(rv);
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MOZ_ASSERT(!rv.Failed());
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return InsertItemBefore(*domItem, 0, aError);
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}
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already_AddRefed<nsISVGPoint>
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DOMSVGPointList::GetItem(uint32_t index, ErrorResult& error)
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{
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bool found;
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RefPtr<nsISVGPoint> item = IndexedGetter(index, found, error);
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if (!found) {
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error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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}
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return item.forget();
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}
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already_AddRefed<nsISVGPoint>
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DOMSVGPointList::IndexedGetter(uint32_t aIndex, bool& aFound,
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ErrorResult& aError)
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{
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if (IsAnimValList()) {
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Element()->FlushAnimations();
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}
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aFound = aIndex < LengthNoFlush();
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if (aFound) {
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return GetItemAt(aIndex);
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}
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return nullptr;
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}
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already_AddRefed<nsISVGPoint>
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DOMSVGPointList::InsertItemBefore(nsISVGPoint& aNewItem, uint32_t aIndex,
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ErrorResult& aError)
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{
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if (IsAnimValList()) {
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aError.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
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return nullptr;
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}
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aIndex = std::min(aIndex, LengthNoFlush());
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if (aIndex >= nsISVGPoint::MaxListIndex()) {
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aError.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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return nullptr;
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}
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nsCOMPtr<nsISVGPoint> domItem = &aNewItem;
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if (domItem->HasOwner() || domItem->IsReadonly() ||
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domItem->IsTranslatePoint()) {
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domItem = domItem->Copy(); // must do this before changing anything!
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}
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// Ensure we have enough memory so we can avoid complex error handling below:
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if (!mItems.SetCapacity(mItems.Length() + 1, fallible) ||
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!InternalList().SetCapacity(InternalList().Length() + 1)) {
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aError.Throw(NS_ERROR_OUT_OF_MEMORY);
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return nullptr;
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}
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if (AnimListMirrorsBaseList()) {
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DOMSVGPointList *animVal =
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GetDOMWrapperIfExists(InternalAList().GetAnimValKey());
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MOZ_ASSERT(animVal, "animVal must be a valid pointer");
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if (!animVal->mItems.SetCapacity(
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animVal->mItems.Length() + 1, fallible)) {
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aError.Throw(NS_ERROR_OUT_OF_MEMORY);
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return nullptr;
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}
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}
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AutoChangePointListNotifier notifier(this);
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// Now that we know we're inserting, keep animVal list in sync as necessary.
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MaybeInsertNullInAnimValListAt(aIndex);
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InternalList().InsertItem(aIndex, domItem->ToSVGPoint());
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MOZ_ALWAYS_TRUE(mItems.InsertElementAt(aIndex, domItem, fallible));
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// This MUST come after the insertion into InternalList(), or else under the
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// insertion into InternalList() the values read from domItem would be bad
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// data from InternalList() itself!:
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domItem->InsertingIntoList(this, aIndex, IsAnimValList());
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UpdateListIndicesFromIndex(mItems, aIndex + 1);
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return domItem.forget();
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}
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already_AddRefed<nsISVGPoint>
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DOMSVGPointList::ReplaceItem(nsISVGPoint& aNewItem, uint32_t aIndex,
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ErrorResult& aError)
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{
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if (IsAnimValList()) {
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aError.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
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return nullptr;
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}
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if (aIndex >= LengthNoFlush()) {
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aError.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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return nullptr;
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}
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nsCOMPtr<nsISVGPoint> domItem = &aNewItem;
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if (domItem->HasOwner() || domItem->IsReadonly() ||
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domItem->IsTranslatePoint()) {
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domItem = domItem->Copy(); // must do this before changing anything!
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}
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AutoChangePointListNotifier notifier(this);
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if (mItems[aIndex]) {
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// Notify any existing DOM item of removal *before* modifying the lists so
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// that the DOM item can copy the *old* value at its index:
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mItems[aIndex]->RemovingFromList();
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}
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InternalList()[aIndex] = domItem->ToSVGPoint();
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mItems[aIndex] = domItem;
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// This MUST come after the ToSVGPoint() call, otherwise that call
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// would end up reading bad data from InternalList()!
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domItem->InsertingIntoList(this, aIndex, IsAnimValList());
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return domItem.forget();
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}
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already_AddRefed<nsISVGPoint>
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DOMSVGPointList::RemoveItem(uint32_t aIndex, ErrorResult& aError)
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{
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if (IsAnimValList()) {
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aError.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
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return nullptr;
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}
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if (aIndex >= LengthNoFlush()) {
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aError.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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return nullptr;
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}
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AutoChangePointListNotifier notifier(this);
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// Now that we know we're removing, keep animVal list in sync as necessary.
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// Do this *before* touching InternalList() so the removed item can get its
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// internal value.
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MaybeRemoveItemFromAnimValListAt(aIndex);
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// We have to return the removed item, so get it, creating it if necessary:
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RefPtr<nsISVGPoint> result = GetItemAt(aIndex);
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// Notify the DOM item of removal *before* modifying the lists so that the
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// DOM item can copy its *old* value:
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mItems[aIndex]->RemovingFromList();
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InternalList().RemoveItem(aIndex);
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mItems.RemoveElementAt(aIndex);
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UpdateListIndicesFromIndex(mItems, aIndex);
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return result.forget();
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}
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already_AddRefed<nsISVGPoint>
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DOMSVGPointList::GetItemAt(uint32_t aIndex)
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{
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MOZ_ASSERT(aIndex < mItems.Length());
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if (!mItems[aIndex]) {
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mItems[aIndex] = new DOMSVGPoint(this, aIndex, IsAnimValList());
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}
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RefPtr<nsISVGPoint> result = mItems[aIndex];
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return result.forget();
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}
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void
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DOMSVGPointList::MaybeInsertNullInAnimValListAt(uint32_t aIndex)
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{
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MOZ_ASSERT(!IsAnimValList(), "call from baseVal to animVal");
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if (!AnimListMirrorsBaseList()) {
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return;
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}
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// The anim val list is in sync with the base val list
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DOMSVGPointList *animVal =
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GetDOMWrapperIfExists(InternalAList().GetAnimValKey());
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MOZ_ASSERT(animVal, "AnimListMirrorsBaseList() promised a non-null animVal");
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MOZ_ASSERT(animVal->mItems.Length() == mItems.Length(),
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"animVal list not in sync!");
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MOZ_ALWAYS_TRUE(animVal->mItems.InsertElementAt(aIndex, nullptr, fallible));
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UpdateListIndicesFromIndex(animVal->mItems, aIndex + 1);
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}
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void
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DOMSVGPointList::MaybeRemoveItemFromAnimValListAt(uint32_t aIndex)
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{
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MOZ_ASSERT(!IsAnimValList(), "call from baseVal to animVal");
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if (!AnimListMirrorsBaseList()) {
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return;
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}
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// This needs to be a strong reference; otherwise, the RemovingFromList call
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// below might drop the last reference to animVal before we're done with it.
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RefPtr<DOMSVGPointList> animVal =
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GetDOMWrapperIfExists(InternalAList().GetAnimValKey());
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MOZ_ASSERT(animVal, "AnimListMirrorsBaseList() promised a non-null animVal");
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MOZ_ASSERT(animVal->mItems.Length() == mItems.Length(),
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"animVal list not in sync!");
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if (animVal->mItems[aIndex]) {
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animVal->mItems[aIndex]->RemovingFromList();
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}
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animVal->mItems.RemoveElementAt(aIndex);
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UpdateListIndicesFromIndex(animVal->mItems, aIndex);
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}
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} // namespace mozilla
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