dom/svg/DOMSVGAnimatedTransformList.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "DOMSVGAnimatedTransformList.h"
   8
   9 #include "DOMSVGTransformList.h"
  10 #include "SVGAnimatedTransformList.h"
  11 #include "SVGAttrTearoffTable.h"
  12 #include "mozilla/dom/SVGAnimatedTransformListBinding.h"
  13
  14 namespace mozilla::dom {
  15
  16 static SVGAttrTearoffTable<SVGAnimatedTransformList,
  17                            DOMSVGAnimatedTransformList>
  18     sSVGAnimatedTransformListTearoffTable;
  19
  20 NS_SVG_VAL_IMPL_CYCLE_COLLECTION_WRAPPERCACHED(DOMSVGAnimatedTransformList,
  21                                                mElement)
  22
  23 JSObject* DOMSVGAnimatedTransformList::WrapObject(
  24     JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
  25   return SVGAnimatedTransformList_Binding::Wrap(aCx, this, aGivenProto);
  26 }
  27
  28 //----------------------------------------------------------------------
  29 already_AddRefed<DOMSVGTransformList> DOMSVGAnimatedTransformList::BaseVal() {
  30   if (!mBaseVal) {
  31     mBaseVal = new DOMSVGTransformList(this, InternalAList().GetBaseValue());
  32   }
  33   RefPtr<DOMSVGTransformList> baseVal = mBaseVal;
  34   return baseVal.forget();
  35 }
  36
  37 already_AddRefed<DOMSVGTransformList> DOMSVGAnimatedTransformList::AnimVal() {
  38   if (!mAnimVal) {
  39     mAnimVal = new DOMSVGTransformList(this, InternalAList().GetAnimValue());
  40   }
  41   RefPtr<DOMSVGTransformList> animVal = mAnimVal;
  42   return animVal.forget();
  43 }
  44
  45 /* static */
  46 already_AddRefed<DOMSVGAnimatedTransformList>
  47 DOMSVGAnimatedTransformList::GetDOMWrapper(SVGAnimatedTransformList* aList,
  48                                            SVGElement* aElement) {
  49   RefPtr<DOMSVGAnimatedTransformList> wrapper =
  50       sSVGAnimatedTransformListTearoffTable.GetTearoff(aList);
  51   if (!wrapper) {
  52     wrapper = new DOMSVGAnimatedTransformList(aElement);
  53     sSVGAnimatedTransformListTearoffTable.AddTearoff(aList, wrapper);
  54   }
  55   return wrapper.forget();
  56 }
  57
  58 /* static */
  59 DOMSVGAnimatedTransformList* DOMSVGAnimatedTransformList::GetDOMWrapperIfExists(
  60     SVGAnimatedTransformList* aList) {
  61   return sSVGAnimatedTransformListTearoffTable.GetTearoff(aList);
  62 }
  63
  64 DOMSVGAnimatedTransformList::~DOMSVGAnimatedTransformList() {
  65   // Script no longer has any references to us, to our base/animVal objects, or
  66   // to any of their list items.
  67   sSVGAnimatedTransformListTearoffTable.RemoveTearoff(&InternalAList());
  68 }
  69
  70 void DOMSVGAnimatedTransformList::InternalBaseValListWillChangeLengthTo(
  71     uint32_t aNewLength) {
  72   // When the number of items in our internal counterpart's baseVal changes,
  73   // we MUST keep our baseVal in sync. If we don't, script will either see a
  74   // list that is too short and be unable to access indexes that should be
  75   // valid, or else, MUCH WORSE, script will see a list that is too long and be
  76   // able to access "items" at indexes that are out of bounds (read/write to
  77   // bad memory)!!
  78
  79   RefPtr<DOMSVGAnimatedTransformList> kungFuDeathGrip;
  80   if (mBaseVal) {
  81     if (aNewLength < mBaseVal->LengthNoFlush()) {
  82       // InternalListLengthWillChange might clear last reference to |this|.
  83       // Retain a temporary reference to keep from dying before returning.
  84       kungFuDeathGrip = this;
  85     }
  86     mBaseVal->InternalListLengthWillChange(aNewLength);
  87   }
  88
  89   // If our attribute is not animating, then our animVal mirrors our baseVal
  90   // and we must sync its length too. (If our attribute is animating, then the
  91   // SMIL engine takes care of calling InternalAnimValListWillChangeLengthTo()
  92   // if necessary.)
  93
  94   if (!IsAnimating()) {
  95     InternalAnimValListWillChangeLengthTo(aNewLength);
  96   }
  97 }
  98
  99 void DOMSVGAnimatedTransformList::InternalAnimValListWillChangeLengthTo(
 100     uint32_t aNewLength) {
 101   if (mAnimVal) {
 102     mAnimVal->InternalListLengthWillChange(aNewLength);
 103   }
 104 }
 105
 106 bool DOMSVGAnimatedTransformList::IsAnimating() const {
 107   return InternalAList().IsAnimating();
 108 }
 109
 110 SVGAnimatedTransformList& DOMSVGAnimatedTransformList::InternalAList() {
 111   return *mElement->GetAnimatedTransformList();
 112 }
 113
 114 const SVGAnimatedTransformList& DOMSVGAnimatedTransformList::InternalAList()
 115     const {
 116   return *mElement->GetAnimatedTransformList();
 117 }
 118
 119 }  // namespace mozilla::dom