1 files changed, 449 insertions, 0 deletions
diff --git a/dom/svg/DOMSVGLength.cpp b/dom/svg/DOMSVGLength.cpp
new file mode 100644
index 0000000000..b3b06d711b
--- /dev/null
+++ b/dom/svg/DOMSVGLength.cpp
@@ -0,0 +1,449 @@
+/* -*- 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 "DOMSVGLength.h"
+
+#include "DOMSVGLengthList.h"
+#include "DOMSVGAnimatedLengthList.h"
+#include "nsError.h"
+#include "nsMathUtils.h"
+#include "SVGAnimatedLength.h"
+#include "SVGAnimatedLengthList.h"
+#include "SVGAttrTearoffTable.h"
+#include "SVGLength.h"
+#include "mozilla/dom/SVGElement.h"
+#include "mozilla/dom/SVGLengthBinding.h"
+#include "mozilla/FloatingPoint.h"
+
+// See the architecture comment in DOMSVGAnimatedLengthList.h.
+
+namespace mozilla {
+
+namespace dom {
+
+static SVGAttrTearoffTable<SVGAnimatedLength, DOMSVGLength>
+    sBaseSVGLengthTearOffTable, sAnimSVGLengthTearOffTable;
+
+// We could use NS_IMPL_CYCLE_COLLECTION(, except that in Unlink() we need to
+// clear our list'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(DOMSVGLength)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(DOMSVGLength)
+  tmp->CleanupWeakRefs();
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mOwner)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(DOMSVGLength)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwner)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(DOMSVGLength)
+  NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
+NS_IMPL_CYCLE_COLLECTION_TRACE_END
+
+NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(DOMSVGLength, AddRef)
+NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(DOMSVGLength, Release)
+
+DOMSVGLength::DOMSVGLength(DOMSVGLengthList* aList, uint8_t aAttrEnum,
+                           uint32_t aListIndex, bool aIsAnimValItem)
+    : mOwner(aList),
+      mListIndex(aListIndex),
+      mAttrEnum(aAttrEnum),
+      mIsAnimValItem(aIsAnimValItem),
+      mUnit(SVGLength_Binding::SVG_LENGTHTYPE_NUMBER) {
+  MOZ_ASSERT(aList, "bad arg");
+  MOZ_ASSERT(mAttrEnum == aAttrEnum, "bitfield too small");
+  MOZ_ASSERT(aListIndex <= MaxListIndex(), "list index too large");
+  MOZ_ASSERT(IndexIsValid(), "Bad index for DOMSVGNumber!");
+}
+
+DOMSVGLength::DOMSVGLength()
+    : mOwner(nullptr),
+      mListIndex(0),
+      mAttrEnum(0),
+      mIsAnimValItem(false),
+      mUnit(SVGLength_Binding::SVG_LENGTHTYPE_NUMBER) {}
+
+DOMSVGLength::DOMSVGLength(SVGAnimatedLength* aVal, SVGElement* aSVGElement,
+                           bool aAnimVal)
+    : mOwner(aSVGElement),
+      mListIndex(0),
+      mAttrEnum(aVal->mAttrEnum),
+      mIsAnimValItem(aAnimVal),
+      mUnit(SVGLength_Binding::SVG_LENGTHTYPE_NUMBER) {
+  MOZ_ASSERT(aVal, "bad arg");
+  MOZ_ASSERT(mAttrEnum == aVal->mAttrEnum, "bitfield too small");
+}
+
+void DOMSVGLength::CleanupWeakRefs() {
+  // Our mList's weak ref to us must be nulled out when we die (or when we're
+  // cycle collected), so we that don't leave behind a pointer to
+  // free / soon-to-be-free memory.
+  if (nsCOMPtr<DOMSVGLengthList> lengthList = do_QueryInterface(mOwner)) {
+    MOZ_ASSERT(lengthList->mItems[mListIndex] == this,
+               "Clearing out the wrong list index...?");
+    lengthList->mItems[mListIndex] = nullptr;
+  }
+
+  // Similarly, we must update the tearoff table to remove its (non-owning)
+  // pointer to mVal.
+  if (nsCOMPtr<SVGElement> svg = do_QueryInterface(mOwner)) {
+    auto& table = mIsAnimValItem ? sAnimSVGLengthTearOffTable
+                                 : sBaseSVGLengthTearOffTable;
+    table.RemoveTearoff(svg->GetAnimatedLength(mAttrEnum));
+  }
+}
+
+already_AddRefed<DOMSVGLength> DOMSVGLength::GetTearOff(SVGAnimatedLength* aVal,
+                                                        SVGElement* aSVGElement,
+                                                        bool aAnimVal) {
+  auto& table =
+      aAnimVal ? sAnimSVGLengthTearOffTable : sBaseSVGLengthTearOffTable;
+  RefPtr<DOMSVGLength> domLength = table.GetTearoff(aVal);
+  if (!domLength) {
+    domLength = new DOMSVGLength(aVal, aSVGElement, aAnimVal);
+    table.AddTearoff(aVal, domLength);
+  }
+
+  return domLength.forget();
+}
+
+DOMSVGLength* DOMSVGLength::Copy() {
+  NS_ASSERTION(HasOwner(), "unexpected caller");
+  DOMSVGLength* copy = new DOMSVGLength();
+  uint16_t unit;
+  float value;
+  if (nsCOMPtr<SVGElement> svg = do_QueryInterface(mOwner)) {
+    SVGAnimatedLength* length = svg->GetAnimatedLength(mAttrEnum);
+    unit = length->GetSpecifiedUnitType();
+    value = mIsAnimValItem ? length->GetAnimValInSpecifiedUnits()
+                           : length->GetBaseValInSpecifiedUnits();
+  } else {
+    const SVGLength& length = InternalItem();
+    unit = length.GetUnit();
+    value = length.GetValueInCurrentUnits();
+  }
+  copy->NewValueSpecifiedUnits(unit, value, IgnoreErrors());
+  return copy;
+}
+
+uint16_t DOMSVGLength::UnitType() {
+  if (mIsAnimValItem) {
+    Element()->FlushAnimations();
+  }
+  if (nsCOMPtr<SVGElement> svg = do_QueryInterface(mOwner)) {
+    return svg->GetAnimatedLength(mAttrEnum)->GetSpecifiedUnitType();
+  }
+  return HasOwner() ? InternalItem().GetUnit() : mUnit;
+}
+
+float DOMSVGLength::GetValue(ErrorResult& aRv) {
+  if (mIsAnimValItem) {
+    Element()->FlushAnimations();  // May make HasOwner() == false
+  }
+
+  if (nsCOMPtr<SVGElement> svg = do_QueryInterface(mOwner)) {
+    SVGAnimatedLength* length = svg->GetAnimatedLength(mAttrEnum);
+    return mIsAnimValItem ? length->GetAnimValue(svg)
+                          : length->GetBaseValue(svg);
+  }
+
+  if (nsCOMPtr<DOMSVGLengthList> lengthList = do_QueryInterface(mOwner)) {
+    float value = InternalItem().GetValueInUserUnits(lengthList->Element(),
+                                                     lengthList->Axis());
+    if (!IsFinite(value)) {
+      aRv.Throw(NS_ERROR_FAILURE);
+    }
+    return value;
+  }
+
+  float unitToPx;
+  if (UserSpaceMetrics::ResolveAbsoluteUnit(mUnit, unitToPx)) {
+    return mValue * unitToPx;
+  }
+
+  // else [SVGWG issue] Can't convert this length's value to user units
+  // ReportToConsole
+  aRv.Throw(NS_ERROR_FAILURE);
+  return 0.0f;
+}
+
+void DOMSVGLength::SetValue(float aUserUnitValue, ErrorResult& aRv) {
+  if (mIsAnimValItem) {
+    aRv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
+    return;
+  }
+
+  if (nsCOMPtr<SVGElement> svg = do_QueryInterface(mOwner)) {
+    aRv = svg->GetAnimatedLength(mAttrEnum)->SetBaseValue(aUserUnitValue, svg,
+                                                          true);
+    return;
+  }
+
+  // Although the value passed in is in user units, this method does not turn
+  // this length into a user unit length. Instead it converts the user unit
+  // value to this length's current unit and sets that, leaving this length's
+  // unit as it is.
+
+  if (nsCOMPtr<DOMSVGLengthList> lengthList = do_QueryInterface(mOwner)) {
+    SVGLength& internalItem = InternalItem();
+    if (internalItem.GetValueInUserUnits(
+            lengthList->Element(), lengthList->Axis()) == aUserUnitValue) {
+      return;
+    }
+    float uuPerUnit = internalItem.GetUserUnitsPerUnit(lengthList->Element(),
+                                                       lengthList->Axis());
+    if (uuPerUnit > 0) {
+      float newValue = aUserUnitValue / uuPerUnit;
+      if (IsFinite(newValue)) {
+        AutoChangeLengthListNotifier notifier(this);
+        internalItem.SetValueAndUnit(newValue, internalItem.GetUnit());
+        return;
+      }
+    }
+  } else if (mUnit == SVGLength_Binding::SVG_LENGTHTYPE_NUMBER ||
+             mUnit == SVGLength_Binding::SVG_LENGTHTYPE_PX) {
+    mValue = aUserUnitValue;
+    return;
+  }
+  // else [SVGWG issue] Can't convert user unit value to this length's unit
+  // ReportToConsole
+  aRv.Throw(NS_ERROR_FAILURE);
+}
+
+float DOMSVGLength::ValueInSpecifiedUnits() {
+  if (mIsAnimValItem) {
+    Element()->FlushAnimations();  // May make HasOwner() == false
+  }
+  if (nsCOMPtr<SVGElement> svg = do_QueryInterface(mOwner)) {
+    SVGAnimatedLength* length = svg->GetAnimatedLength(mAttrEnum);
+    return mIsAnimValItem ? length->GetAnimValInSpecifiedUnits()
+                          : length->GetBaseValInSpecifiedUnits();
+  }
+
+  return HasOwner() ? InternalItem().GetValueInCurrentUnits() : mValue;
+}
+
+void DOMSVGLength::SetValueInSpecifiedUnits(float aValue, ErrorResult& aRv) {
+  if (mIsAnimValItem) {
+    aRv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
+    return;
+  }
+
+  if (nsCOMPtr<SVGElement> svg = do_QueryInterface(mOwner)) {
+    svg->GetAnimatedLength(mAttrEnum)->SetBaseValueInSpecifiedUnits(aValue, svg,
+                                                                    true);
+    return;
+  }
+
+  if (HasOwner()) {
+    SVGLength& internalItem = InternalItem();
+    if (internalItem.GetValueInCurrentUnits() == aValue) {
+      return;
+    }
+    AutoChangeLengthListNotifier notifier(this);
+    internalItem.SetValueInCurrentUnits(aValue);
+    return;
+  }
+  mValue = aValue;
+}
+
+void DOMSVGLength::SetValueAsString(const nsAString& aValue, ErrorResult& aRv) {
+  if (mIsAnimValItem) {
+    aRv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
+    return;
+  }
+
+  if (nsCOMPtr<SVGElement> svg = do_QueryInterface(mOwner)) {
+    aRv = svg->GetAnimatedLength(mAttrEnum)->SetBaseValueString(aValue, svg,
+                                                                true);
+    return;
+  }
+
+  SVGLength value;
+  if (!value.SetValueFromString(aValue)) {
+    aRv.Throw(NS_ERROR_DOM_SYNTAX_ERR);
+    return;
+  }
+  if (HasOwner()) {
+    SVGLength& internalItem = InternalItem();
+    if (internalItem == value) {
+      return;
+    }
+    AutoChangeLengthListNotifier notifier(this);
+    internalItem = value;
+    return;
+  }
+  mValue = value.GetValueInCurrentUnits();
+  mUnit = value.GetUnit();
+}
+
+void DOMSVGLength::GetValueAsString(nsAString& aValue) {
+  if (mIsAnimValItem) {
+    Element()->FlushAnimations();  // May make HasOwner() == false
+  }
+
+  if (nsCOMPtr<SVGElement> svg = do_QueryInterface(mOwner)) {
+    SVGAnimatedLength* length = svg->GetAnimatedLength(mAttrEnum);
+    if (mIsAnimValItem) {
+      length->GetAnimValueString(aValue);
+    } else {
+      length->GetBaseValueString(aValue);
+    }
+    return;
+  }
+  if (HasOwner()) {
+    InternalItem().GetValueAsString(aValue);
+    return;
+  }
+  SVGLength(mValue, mUnit).GetValueAsString(aValue);
+}
+
+void DOMSVGLength::NewValueSpecifiedUnits(uint16_t aUnit, float aValue,
+                                          ErrorResult& aRv) {
+  if (mIsAnimValItem) {
+    aRv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
+    return;
+  }
+
+  if (nsCOMPtr<SVGElement> svg = do_QueryInterface(mOwner)) {
+    svg->GetAnimatedLength(mAttrEnum)->NewValueSpecifiedUnits(aUnit, aValue,
+                                                              svg);
+    return;
+  }
+
+  if (!SVGLength::IsValidUnitType(aUnit)) {
+    aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
+    return;
+  }
+  if (HasOwner()) {
+    SVGLength& internalItem = InternalItem();
+    if (internalItem == SVGLength(aValue, aUnit)) {
+      return;
+    }
+    AutoChangeLengthListNotifier notifier(this);
+    internalItem.SetValueAndUnit(aValue, uint8_t(aUnit));
+    return;
+  }
+  mUnit = uint8_t(aUnit);
+  mValue = aValue;
+}
+
+void DOMSVGLength::ConvertToSpecifiedUnits(uint16_t aUnit, ErrorResult& aRv) {
+  if (mIsAnimValItem) {
+    aRv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
+    return;
+  }
+
+  if (nsCOMPtr<SVGElement> svg = do_QueryInterface(mOwner)) {
+    svg->GetAnimatedLength(mAttrEnum)->ConvertToSpecifiedUnits(aUnit, svg);
+    return;
+  }
+
+  if (!SVGLength::IsValidUnitType(aUnit)) {
+    aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
+    return;
+  }
+
+  float val;
+  if (nsCOMPtr<DOMSVGLengthList> lengthList = do_QueryInterface(mOwner)) {
+    SVGLength& length = InternalItem();
+    if (length.GetUnit() == aUnit) {
+      return;
+    }
+    val = length.GetValueInSpecifiedUnit(aUnit, lengthList->Element(),
+                                         lengthList->Axis());
+  } else {
+    val = SVGLength(mValue, mUnit).GetValueInSpecifiedUnit(aUnit, nullptr, 0);
+  }
+  if (IsFinite(val)) {
+    if (HasOwner()) {
+      AutoChangeLengthListNotifier notifier(this);
+      InternalItem().SetValueAndUnit(val, aUnit);
+    } else {
+      mValue = val;
+      mUnit = aUnit;
+    }
+    return;
+  }
+  // else [SVGWG issue] Can't convert unit
+  // ReportToConsole
+  aRv.Throw(NS_ERROR_FAILURE);
+}
+
+JSObject* DOMSVGLength::WrapObject(JSContext* aCx,
+                                   JS::Handle<JSObject*> aGivenProto) {
+  return SVGLength_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+void DOMSVGLength::InsertingIntoList(DOMSVGLengthList* aList, uint8_t aAttrEnum,
+                                     uint32_t aListIndex, bool aIsAnimValItem) {
+  NS_ASSERTION(!HasOwner(), "Inserting item that is already in a list");
+
+  mOwner = aList;
+  mAttrEnum = aAttrEnum;
+  mListIndex = aListIndex;
+  mIsAnimValItem = aIsAnimValItem;
+
+  MOZ_ASSERT(IndexIsValid(), "Bad index for DOMSVGLength!");
+}
+
+void DOMSVGLength::RemovingFromList() {
+  mValue = InternalItem().GetValueInCurrentUnits();
+  mUnit = InternalItem().GetUnit();
+  mOwner = nullptr;
+  mIsAnimValItem = false;
+}
+
+SVGLength DOMSVGLength::ToSVGLength() {
+  if (nsCOMPtr<SVGElement> svg = do_QueryInterface(mOwner)) {
+    SVGAnimatedLength* length = svg->GetAnimatedLength(mAttrEnum);
+    return SVGLength(mIsAnimValItem ? length->GetAnimValInSpecifiedUnits()
+                                    : length->GetBaseValInSpecifiedUnits(),
+                     length->GetSpecifiedUnitType());
+  }
+  return HasOwner() ? InternalItem() : SVGLength(mValue, mUnit);
+}
+
+bool DOMSVGLength::IsAnimating() const {
+  if (nsCOMPtr<DOMSVGLengthList> lengthList = do_QueryInterface(mOwner)) {
+    return lengthList->IsAnimating();
+  }
+  nsCOMPtr<SVGElement> svg = do_QueryInterface(mOwner);
+  return svg && svg->GetAnimatedLength(mAttrEnum)->IsAnimated();
+}
+
+SVGElement* DOMSVGLength::Element() {
+  if (nsCOMPtr<DOMSVGLengthList> lengthList = do_QueryInterface(mOwner)) {
+    return lengthList->Element();
+  }
+  nsCOMPtr<SVGElement> svg = do_QueryInterface(mOwner);
+  return svg;
+}
+
+SVGLength& DOMSVGLength::InternalItem() {
+  nsCOMPtr<DOMSVGLengthList> lengthList = do_QueryInterface(mOwner);
+  SVGAnimatedLengthList* alist =
+      lengthList->Element()->GetAnimatedLengthList(mAttrEnum);
+  return mIsAnimValItem && alist->mAnimVal ? (*alist->mAnimVal)[mListIndex]
+                                           : alist->mBaseVal[mListIndex];
+}
+
+#ifdef DEBUG
+bool DOMSVGLength::IndexIsValid() {
+  nsCOMPtr<DOMSVGLengthList> lengthList = do_QueryInterface(mOwner);
+  SVGAnimatedLengthList* alist =
+      lengthList->Element()->GetAnimatedLengthList(mAttrEnum);
+  return (mIsAnimValItem && mListIndex < alist->GetAnimValue().Length()) ||
+         (!mIsAnimValItem && mListIndex < alist->GetBaseValue().Length());
+}
+#endif
+
+}  // namespace dom
+}  // namespace mozilla