mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-08-15 02:29:04 +00:00
446 lines
14 KiB
C++
446 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 "DOMSVGTransformList.h"
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#include "mozilla/dom/SVGTransform.h"
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#include "mozilla/dom/SVGMatrix.h"
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#include "nsSVGAnimatedTransformList.h"
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#include "nsSVGElement.h"
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#include "mozilla/dom/SVGTransformListBinding.h"
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#include "nsError.h"
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#include <algorithm>
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// local helper functions
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namespace {
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void UpdateListIndicesFromIndex(
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FallibleTArray<mozilla::dom::SVGTransform*>& 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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using namespace dom;
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// We could use NS_IMPL_CYCLE_COLLECTION(, except that in Unlink() we need to
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// clear our SVGAnimatedTransformList's weak ref to us to be safe. (The other
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// option would be to not unlink and rely on the breaking of the other edges in
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// the cycle, as NS_SVG_VAL_IMPL_CYCLE_COLLECTION does.)
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NS_IMPL_CYCLE_COLLECTION_CLASS(DOMSVGTransformList)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(DOMSVGTransformList)
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if (tmp->mAList) {
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if (tmp->IsAnimValList()) {
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tmp->mAList->mAnimVal = nullptr;
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} else {
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tmp->mAList->mBaseVal = nullptr;
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}
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mAList)
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}
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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(DOMSVGTransformList)
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAList)
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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(DOMSVGTransformList)
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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(DOMSVGTransformList)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(DOMSVGTransformList)
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DOMSVGTransformList)
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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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// DOMSVGTransformList methods:
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JSObject*
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DOMSVGTransformList::WrapObject(JSContext *cx, JS::Handle<JSObject*> aGivenProto)
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{
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return mozilla::dom::SVGTransformListBinding::Wrap(cx, this, aGivenProto);
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}
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//----------------------------------------------------------------------
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// Helper class: AutoChangeTransformListNotifier
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// Stack-based helper class to pair calls to WillChangeTransformList and
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// DidChangeTransformList.
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class MOZ_RAII AutoChangeTransformListNotifier
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{
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public:
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explicit AutoChangeTransformListNotifier(DOMSVGTransformList* aTransformList MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
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: mTransformList(aTransformList)
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{
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MOZ_GUARD_OBJECT_NOTIFIER_INIT;
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MOZ_ASSERT(mTransformList, "Expecting non-null transformList");
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mEmptyOrOldValue =
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mTransformList->Element()->WillChangeTransformList();
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}
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~AutoChangeTransformListNotifier()
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{
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mTransformList->Element()->DidChangeTransformList(mEmptyOrOldValue);
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if (mTransformList->IsAnimating()) {
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mTransformList->Element()->AnimationNeedsResample();
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}
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}
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private:
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DOMSVGTransformList* const mTransformList;
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nsAttrValue mEmptyOrOldValue;
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MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
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};
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void
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DOMSVGTransformList::InternalListLengthWillChange(uint32_t aNewLength)
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{
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uint32_t oldLength = mItems.Length();
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if (aNewLength > SVGTransform::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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aNewLength = SVGTransform::MaxListIndex();
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}
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RefPtr<DOMSVGTransformList> kungFuDeathGrip;
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if (aNewLength < 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 = aNewLength; 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(aNewLength, 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 < aNewLength; ++i) {
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mItems[i] = nullptr;
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}
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}
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SVGTransformList&
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DOMSVGTransformList::InternalList() const
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{
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nsSVGAnimatedTransformList *alist = Element()->GetAnimatedTransformList();
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return IsAnimValList() && alist->mAnimVal ?
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*alist->mAnimVal :
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alist->mBaseVal;
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}
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//----------------------------------------------------------------------
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void
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DOMSVGTransformList::Clear(ErrorResult& error)
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{
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if (IsAnimValList()) {
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error.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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AutoChangeTransformListNotifier notifier(this);
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// Notify any existing DOM items of removal *before* truncating the lists
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// so that they can find their SVGTransform internal counterparts and copy
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// their values. This also notifies the animVal list:
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mAList->InternalBaseValListWillChangeLengthTo(0);
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mItems.Clear();
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InternalList().Clear();
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}
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}
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already_AddRefed<SVGTransform>
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DOMSVGTransformList::Initialize(SVGTransform& newItem, ErrorResult& error)
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{
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if (IsAnimValList()) {
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error.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
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return nullptr;
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}
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// If newItem is already in a list we should insert a clone of newItem, and
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// for consistency, this should happen even if *this* is the list that
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// newItem is currently in. Note that in the case of newItem 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 newItem, it would actually insert newItem. To prevent that from
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// happening we have to do the clone here, if necessary.
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RefPtr<SVGTransform> domItem = &newItem;
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if (domItem->HasOwner()) {
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domItem = newItem.Clone();
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}
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Clear(error);
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MOZ_ASSERT(!error.Failed(), "How could this fail?");
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return InsertItemBefore(*domItem, 0, error);
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}
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already_AddRefed<SVGTransform>
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DOMSVGTransformList::GetItem(uint32_t index, ErrorResult& error)
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{
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bool found;
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RefPtr<SVGTransform> 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<SVGTransform>
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DOMSVGTransformList::IndexedGetter(uint32_t index, bool& found,
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ErrorResult& error)
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{
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if (IsAnimValList()) {
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Element()->FlushAnimations();
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}
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found = index < LengthNoFlush();
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if (found) {
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return GetItemAt(index);
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}
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return nullptr;
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}
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already_AddRefed<SVGTransform>
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DOMSVGTransformList::InsertItemBefore(SVGTransform& newItem,
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uint32_t index, ErrorResult& error)
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{
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if (IsAnimValList()) {
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error.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
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return nullptr;
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}
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index = std::min(index, LengthNoFlush());
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if (index >= SVGTransform::MaxListIndex()) {
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error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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return nullptr;
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}
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RefPtr<SVGTransform> domItem = &newItem;
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if (newItem.HasOwner()) {
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domItem = newItem.Clone(); // 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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error.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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if (!mAList->mAnimVal->mItems.SetCapacity(
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mAList->mAnimVal->mItems.Length() + 1, fallible)) {
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error.Throw(NS_ERROR_OUT_OF_MEMORY);
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return nullptr;
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}
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}
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AutoChangeTransformListNotifier 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(index);
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InternalList().InsertItem(index, domItem->ToSVGTransform());
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MOZ_ALWAYS_TRUE(mItems.InsertElementAt(index, domItem.get(), 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, index, IsAnimValList());
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UpdateListIndicesFromIndex(mItems, index + 1);
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return domItem.forget();
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}
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already_AddRefed<SVGTransform>
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DOMSVGTransformList::ReplaceItem(SVGTransform& newItem,
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uint32_t index, ErrorResult& error)
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{
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if (IsAnimValList()) {
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error.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
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return nullptr;
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}
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if (index >= LengthNoFlush()) {
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error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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return nullptr;
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}
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RefPtr<SVGTransform> domItem = &newItem;
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if (newItem.HasOwner()) {
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domItem = newItem.Clone(); // must do this before changing anything!
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}
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AutoChangeTransformListNotifier notifier(this);
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if (mItems[index]) {
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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[index]->RemovingFromList();
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}
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InternalList()[index] = domItem->ToSVGTransform();
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mItems[index] = 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, index, IsAnimValList());
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return domItem.forget();
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}
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already_AddRefed<SVGTransform>
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DOMSVGTransformList::RemoveItem(uint32_t index, ErrorResult& error)
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{
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if (IsAnimValList()) {
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error.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
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return nullptr;
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}
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if (index >= LengthNoFlush()) {
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error.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
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return nullptr;
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}
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AutoChangeTransformListNotifier 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(index);
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// We have to return the removed item, so get it, creating it if necessary:
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RefPtr<SVGTransform> result = GetItemAt(index);
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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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result->RemovingFromList();
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InternalList().RemoveItem(index);
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mItems.RemoveElementAt(index);
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UpdateListIndicesFromIndex(mItems, index);
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return result.forget();
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}
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already_AddRefed<SVGTransform>
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DOMSVGTransformList::CreateSVGTransformFromMatrix(dom::SVGMatrix& matrix)
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{
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RefPtr<SVGTransform> result = new SVGTransform(matrix.GetMatrix());
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return result.forget();
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}
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already_AddRefed<SVGTransform>
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DOMSVGTransformList::Consolidate(ErrorResult& error)
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{
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if (IsAnimValList()) {
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error.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
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return nullptr;
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}
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if (LengthNoFlush() == 0) {
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return nullptr;
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}
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// Note that SVG 1.1 says, "The consolidation operation creates new
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// SVGTransform object as the first and only item in the list" hence, even if
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// LengthNoFlush() == 1 we can't return that one item (after making it a
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// matrix type). We must orphan the existing item and then make a new one.
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// First calculate our matrix
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gfxMatrix mx = InternalList().GetConsolidationMatrix();
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// Then orphan the existing items
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Clear(error);
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MOZ_ASSERT(!error.Failed(), "How could this fail?");
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// And append the new transform
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RefPtr<SVGTransform> transform = new SVGTransform(mx);
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return InsertItemBefore(*transform, LengthNoFlush(), error);
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}
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//----------------------------------------------------------------------
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// Implementation helpers:
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already_AddRefed<SVGTransform>
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DOMSVGTransformList::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 SVGTransform(this, aIndex, IsAnimValList());
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}
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RefPtr<SVGTransform> result = mItems[aIndex];
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return result.forget();
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}
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void
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DOMSVGTransformList::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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DOMSVGTransformList* animVal = mAList->mAnimVal;
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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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DOMSVGTransformList::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<DOMSVGTransformList> animVal = mAList->mAnimVal;
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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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