1 files changed, 298 insertions, 0 deletions
diff --git a/dom/svg/SVGAnimatedTransformList.cpp b/dom/svg/SVGAnimatedTransformList.cpp
new file mode 100644
index 0000000000..3f1f029a98
--- /dev/null
+++ b/dom/svg/SVGAnimatedTransformList.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 "SVGAnimatedTransformList.h"
+
+#include <utility>
+
+#include "DOMSVGAnimatedTransformList.h"
+#include "SVGTransform.h"
+#include "SVGTransformListSMILType.h"
+#include "mozilla/SMILValue.h"
+#include "mozilla/SVGContentUtils.h"
+#include "mozilla/dom/MutationEventBinding.h"
+#include "mozilla/dom/SVGAnimationElement.h"
+#include "nsCharSeparatedTokenizer.h"
+#include "nsContentUtils.h"
+
+using namespace mozilla::dom;
+using namespace mozilla::dom::SVGTransform_Binding;
+
+namespace mozilla {
+
+nsresult SVGAnimatedTransformList::SetBaseValueString(const nsAString& aValue,
+                                                      SVGElement* aSVGElement) {
+  SVGTransformList newBaseValue;
+  nsresult rv = newBaseValue.SetValueFromString(aValue);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  return SetBaseValue(newBaseValue, aSVGElement);
+}
+
+nsresult SVGAnimatedTransformList::SetBaseValue(const SVGTransformList& aValue,
+                                                SVGElement* aSVGElement) {
+  DOMSVGAnimatedTransformList* domWrapper =
+      DOMSVGAnimatedTransformList::GetDOMWrapperIfExists(this);
+  if (domWrapper) {
+    // We must send this notification *before* changing mBaseVal! If the length
+    // of our baseVal is being reduced, our baseVal's DOM wrapper list may have
+    // to remove DOM items from itself, and any removed DOM items need to copy
+    // their internal counterpart values *before* we change them.
+    //
+    domWrapper->InternalBaseValListWillChangeLengthTo(aValue.Length());
+  }
+
+  // (This bool will be copied to our member-var, if attr-change succeeds.)
+  bool hadTransform = HasTransform();
+
+  // We don't need to call DidChange* here - we're only called by
+  // SVGElement::ParseAttribute under Element::SetAttr,
+  // which takes care of notifying.
+
+  nsresult rv = mBaseVal.CopyFrom(aValue);
+  if (NS_FAILED(rv) && domWrapper) {
+    // Attempting to increase mBaseVal's length failed - reduce domWrapper
+    // back to the same length:
+    domWrapper->InternalBaseValListWillChangeLengthTo(mBaseVal.Length());
+  } else {
+    mIsAttrSet = true;
+    // We only need to treat this as a creation or removal of a transform if the
+    // frame already exists and it didn't have an existing one.
+    mCreatedOrRemovedOnLastChange =
+        aSVGElement->GetPrimaryFrame() && !hadTransform;
+  }
+  return rv;
+}
+
+void SVGAnimatedTransformList::ClearBaseValue() {
+  mCreatedOrRemovedOnLastChange = !HasTransform();
+
+  DOMSVGAnimatedTransformList* domWrapper =
+      DOMSVGAnimatedTransformList::GetDOMWrapperIfExists(this);
+  if (domWrapper) {
+    // We must send this notification *before* changing mBaseVal! (See above.)
+    domWrapper->InternalBaseValListWillChangeLengthTo(0);
+  }
+  mBaseVal.Clear();
+  mIsAttrSet = false;
+  // Caller notifies
+}
+
+nsresult SVGAnimatedTransformList::SetAnimValue(const SVGTransformList& aValue,
+                                                SVGElement* aElement) {
+  bool prevSet = HasTransform() || aElement->GetAnimateMotionTransform();
+  DOMSVGAnimatedTransformList* domWrapper =
+      DOMSVGAnimatedTransformList::GetDOMWrapperIfExists(this);
+  if (domWrapper) {
+    // A new animation may totally change the number of items in the animVal
+    // list, replacing what was essentially a mirror of the baseVal list, or
+    // else replacing and overriding an existing animation. When this happens
+    // we must try and keep our animVal's DOM wrapper in sync (see the comment
+    // in DOMSVGAnimatedTransformList::InternalBaseValListWillChangeLengthTo).
+    //
+    // It's not possible for us to reliably distinguish between calls to this
+    // method that are setting a new sample for an existing animation, and
+    // calls that are setting the first sample of an animation that will
+    // override an existing animation. Happily it's cheap to just blindly
+    // notify our animVal's DOM wrapper of its internal counterpart's new value
+    // each time this method is called, so that's what we do.
+    //
+    // Note that we must send this notification *before* setting or changing
+    // mAnimVal! (See the comment in SetBaseValueString above.)
+    //
+    domWrapper->InternalAnimValListWillChangeLengthTo(aValue.Length());
+  }
+  if (!mAnimVal) {
+    mAnimVal = MakeUnique<SVGTransformList>();
+  }
+  nsresult rv = mAnimVal->CopyFrom(aValue);
+  if (NS_FAILED(rv)) {
+    // OOM. We clear the animation, and, importantly, ClearAnimValue() ensures
+    // that mAnimVal and its DOM wrapper (if any) will have the same length!
+    ClearAnimValue(aElement);
+    return rv;
+  }
+  int32_t modType;
+  if (prevSet) {
+    modType = MutationEvent_Binding::MODIFICATION;
+  } else {
+    modType = MutationEvent_Binding::ADDITION;
+  }
+  mCreatedOrRemovedOnLastChange = modType == MutationEvent_Binding::ADDITION;
+  aElement->DidAnimateTransformList(modType);
+  return NS_OK;
+}
+
+void SVGAnimatedTransformList::ClearAnimValue(SVGElement* aElement) {
+  DOMSVGAnimatedTransformList* domWrapper =
+      DOMSVGAnimatedTransformList::GetDOMWrapperIfExists(this);
+  if (domWrapper) {
+    // When all animation ends, animVal simply mirrors baseVal, which may have
+    // a different number of items to the last active animated value. We must
+    // keep the length of our animVal's DOM wrapper list in sync, and again we
+    // must do that before touching mAnimVal. See comments above.
+    //
+    domWrapper->InternalAnimValListWillChangeLengthTo(mBaseVal.Length());
+  }
+  mAnimVal = nullptr;
+  int32_t modType;
+  if (HasTransform() || aElement->GetAnimateMotionTransform()) {
+    modType = MutationEvent_Binding::MODIFICATION;
+  } else {
+    modType = MutationEvent_Binding::REMOVAL;
+  }
+  mCreatedOrRemovedOnLastChange = modType == MutationEvent_Binding::REMOVAL;
+  aElement->DidAnimateTransformList(modType);
+}
+
+bool SVGAnimatedTransformList::IsExplicitlySet() const {
+  // Like other methods of this name, we need to know when a transform value has
+  // been explicitly set.
+  //
+  // There are three ways an animated list can become set:
+  // 1) Markup -- we set mIsAttrSet to true on any successful call to
+  //    SetBaseValueString and clear it on ClearBaseValue (as called by
+  //    SVGElement::UnsetAttr or a failed SVGElement::ParseAttribute)
+  // 2) DOM call -- simply fetching the baseVal doesn't mean the transform value
+  //    has been set. It is set if that baseVal has one or more transforms in
+  //    the list.
+  // 3) Animation -- which will cause the mAnimVal member to be allocated
+  return mIsAttrSet || !mBaseVal.IsEmpty() || mAnimVal;
+}
+
+UniquePtr<SMILAttr> SVGAnimatedTransformList::ToSMILAttr(
+    SVGElement* aSVGElement) {
+  return MakeUnique<SMILAnimatedTransformList>(this, aSVGElement);
+}
+
+nsresult SVGAnimatedTransformList::SMILAnimatedTransformList::ValueFromString(
+    const nsAString& aStr, const dom::SVGAnimationElement* aSrcElement,
+    SMILValue& aValue, bool& aPreventCachingOfSandwich) const {
+  NS_ENSURE_TRUE(aSrcElement, NS_ERROR_FAILURE);
+  MOZ_ASSERT(aValue.IsNull(),
+             "aValue should have been cleared before calling ValueFromString");
+
+  const nsAttrValue* typeAttr = aSrcElement->GetParsedAttr(nsGkAtoms::type);
+  const nsAtom* transformType = nsGkAtoms::translate;  // default val
+  if (typeAttr) {
+    if (typeAttr->Type() != nsAttrValue::eAtom) {
+      // Recognized values of |type| are parsed as an atom -- so if we have
+      // something other than an atom, then we know already our |type| is
+      // invalid.
+      return NS_ERROR_FAILURE;
+    }
+    transformType = typeAttr->GetAtomValue();
+  }
+
+  ParseValue(aStr, transformType, aValue);
+  aPreventCachingOfSandwich = false;
+  return aValue.IsNull() ? NS_ERROR_FAILURE : NS_OK;
+}
+
+void SVGAnimatedTransformList::SMILAnimatedTransformList::ParseValue(
+    const nsAString& aSpec, const nsAtom* aTransformType, SMILValue& aResult) {
+  MOZ_ASSERT(aResult.IsNull(), "Unexpected type for SMIL value");
+
+  static_assert(SVGTransformSMILData::NUM_SIMPLE_PARAMS == 3,
+                "SVGSMILTransform constructor should be expecting array "
+                "with 3 params");
+
+  float params[3] = {0.f};
+  int32_t numParsed = ParseParameterList(aSpec, params, 3);
+  uint16_t transformType;
+
+  if (aTransformType == nsGkAtoms::translate) {
+    // tx [ty=0]
+    if (numParsed != 1 && numParsed != 2) return;
+    transformType = SVG_TRANSFORM_TRANSLATE;
+  } else if (aTransformType == nsGkAtoms::scale) {
+    // sx [sy=sx]
+    if (numParsed != 1 && numParsed != 2) return;
+    if (numParsed == 1) {
+      params[1] = params[0];
+    }
+    transformType = SVG_TRANSFORM_SCALE;
+  } else if (aTransformType == nsGkAtoms::rotate) {
+    // r [cx=0 cy=0]
+    if (numParsed != 1 && numParsed != 3) return;
+    transformType = SVG_TRANSFORM_ROTATE;
+  } else if (aTransformType == nsGkAtoms::skewX) {
+    // x-angle
+    if (numParsed != 1) return;
+    transformType = SVG_TRANSFORM_SKEWX;
+  } else if (aTransformType == nsGkAtoms::skewY) {
+    // y-angle
+    if (numParsed != 1) return;
+    transformType = SVG_TRANSFORM_SKEWY;
+  } else {
+    return;
+  }
+
+  SMILValue val(SVGTransformListSMILType::Singleton());
+  SVGTransformSMILData transform(transformType, params);
+  if (NS_FAILED(SVGTransformListSMILType::AppendTransform(transform, val))) {
+    return;  // OOM
+  }
+
+  // Success! Populate our outparam with parsed value.
+  aResult = std::move(val);
+}
+
+int32_t SVGAnimatedTransformList::SMILAnimatedTransformList::ParseParameterList(
+    const nsAString& aSpec, float* aVars, int32_t aNVars) {
+  int numArgsFound = 0;
+
+  for (const auto& token :
+       nsCharSeparatedTokenizerTemplate<nsContentUtils::IsHTMLWhitespace,
+                                        nsTokenizerFlags::SeparatorOptional>(
+           aSpec, ',')
+           .ToRange()) {
+    float f;
+    if (!SVGContentUtils::ParseNumber(token, f)) {
+      return -1;
+    }
+    if (numArgsFound < aNVars) {
+      aVars[numArgsFound] = f;
+    }
+    numArgsFound++;
+  }
+  return numArgsFound;
+}
+
+SMILValue SVGAnimatedTransformList::SMILAnimatedTransformList::GetBaseValue()
+    const {
+  // To benefit from Return Value Optimization and avoid copy constructor calls
+  // due to our use of return-by-value, we must return the exact same object
+  // from ALL return points. This function must only return THIS variable:
+  SMILValue val(SVGTransformListSMILType::Singleton());
+  if (!SVGTransformListSMILType::AppendTransforms(mVal->mBaseVal, val)) {
+    val = SMILValue();
+  }
+
+  return val;
+}
+
+nsresult SVGAnimatedTransformList::SMILAnimatedTransformList::SetAnimValue(
+    const SMILValue& aNewAnimValue) {
+  MOZ_ASSERT(aNewAnimValue.mType == SVGTransformListSMILType::Singleton(),
+             "Unexpected type to assign animated value");
+  SVGTransformList animVal;
+  if (!SVGTransformListSMILType::GetTransforms(aNewAnimValue, animVal.mItems)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  return mVal->SetAnimValue(animVal, mElement);
+}
+
+void SVGAnimatedTransformList::SMILAnimatedTransformList::ClearAnimValue() {
+  if (mVal->mAnimVal) {
+    mVal->ClearAnimValue(mElement);
+  }
+}
+
+}  // namespace mozilla