1 files changed, 323 insertions, 0 deletions
diff --git a/dom/svg/nsSVGAnimatedTransformList.cpp b/dom/svg/nsSVGAnimatedTransformList.cpp
new file mode 100644
index 000000000..b5933faef
--- /dev/null
+++ b/dom/svg/nsSVGAnimatedTransformList.cpp
@@ -0,0 +1,323 @@
+/* -*- 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 "nsSVGAnimatedTransformList.h"
+
+#include "mozilla/dom/SVGAnimatedTransformList.h"
+#include "mozilla/dom/SVGAnimationElement.h"
+#include "mozilla/Move.h"
+#include "nsCharSeparatedTokenizer.h"
+#include "nsSVGTransform.h"
+#include "nsSMILValue.h"
+#include "SVGContentUtils.h"
+#include "SVGTransformListSMILType.h"
+#include "nsIDOMMutationEvent.h"
+
+namespace mozilla {
+
+using namespace dom;
+
+nsresult
+nsSVGAnimatedTransformList::SetBaseValueString(const nsAString& aValue)
+{
+  SVGTransformList newBaseValue;
+  nsresult rv = newBaseValue.SetValueFromString(aValue);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  return SetBaseValue(newBaseValue);
+}
+
+nsresult
+nsSVGAnimatedTransformList::SetBaseValue(const SVGTransformList& aValue)
+{
+  SVGAnimatedTransformList *domWrapper =
+    SVGAnimatedTransformList::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
+  // nsSVGElement::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;
+    mHadTransformBeforeLastBaseValChange = hadTransform;
+  }
+  return rv;
+}
+
+void
+nsSVGAnimatedTransformList::ClearBaseValue()
+{
+  mHadTransformBeforeLastBaseValChange = HasTransform();
+
+  SVGAnimatedTransformList *domWrapper =
+    SVGAnimatedTransformList::GetDOMWrapperIfExists(this);
+  if (domWrapper) {
+    // We must send this notification *before* changing mBaseVal! (See above.)
+    domWrapper->InternalBaseValListWillChangeLengthTo(0);
+  }
+  mBaseVal.Clear();
+  mIsAttrSet = false;
+  // Caller notifies
+}
+
+nsresult
+nsSVGAnimatedTransformList::SetAnimValue(const SVGTransformList& aValue,
+                                         nsSVGElement *aElement)
+{
+  bool prevSet = HasTransform() || aElement->GetAnimateMotionTransform();
+  SVGAnimatedTransformList *domWrapper =
+    SVGAnimatedTransformList::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 SVGAnimatedTransformList::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 = new 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 = nsIDOMMutationEvent::MODIFICATION;
+  } else {
+    modType = nsIDOMMutationEvent::ADDITION;
+  }
+  aElement->DidAnimateTransformList(modType);
+  return NS_OK;
+}
+
+void
+nsSVGAnimatedTransformList::ClearAnimValue(nsSVGElement *aElement)
+{
+  SVGAnimatedTransformList *domWrapper =
+    SVGAnimatedTransformList::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 = nsIDOMMutationEvent::MODIFICATION;
+  } else {
+    modType = nsIDOMMutationEvent::REMOVAL;
+  }
+  aElement->DidAnimateTransformList(modType);
+}
+
+bool
+nsSVGAnimatedTransformList::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
+  //    nsSVGElement::UnsetAttr or a failed nsSVGElement::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;
+}
+
+nsISMILAttr*
+nsSVGAnimatedTransformList::ToSMILAttr(nsSVGElement* aSVGElement)
+{
+  return new SMILAnimatedTransformList(this, aSVGElement);
+}
+
+nsresult
+nsSVGAnimatedTransformList::SMILAnimatedTransformList::ValueFromString(
+  const nsAString& aStr,
+  const dom::SVGAnimationElement* aSrcElement,
+  nsSMILValue& 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->GetAnimAttr(nsGkAtoms::type);
+  const nsIAtom* 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
+nsSVGAnimatedTransformList::SMILAnimatedTransformList::ParseValue(
+  const nsAString& aSpec,
+  const nsIAtom* aTransformType,
+  nsSMILValue& aResult)
+{
+  MOZ_ASSERT(aResult.IsNull(), "Unexpected type for SMIL value");
+
+  static_assert(SVGTransformSMILData::NUM_SIMPLE_PARAMS == 3,
+                "nsSVGSMILTransform 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;
+  }
+
+  nsSMILValue val(SVGTransformListSMILType::Singleton());
+  SVGTransformSMILData transform(transformType, params);
+  if (NS_FAILED(SVGTransformListSMILType::AppendTransform(transform, val))) {
+    return; // OOM
+  }
+
+  // Success! Populate our outparam with parsed value.
+  aResult = Move(val);
+}
+
+int32_t
+nsSVGAnimatedTransformList::SMILAnimatedTransformList::ParseParameterList(
+  const nsAString& aSpec,
+  float* aVars,
+  int32_t aNVars)
+{
+  nsCharSeparatedTokenizerTemplate<IsSVGWhitespace>
+    tokenizer(aSpec, ',', nsCharSeparatedTokenizer::SEPARATOR_OPTIONAL);
+
+  int numArgsFound = 0;
+
+  while (tokenizer.hasMoreTokens()) {
+    float f;
+    if (!SVGContentUtils::ParseNumber(tokenizer.nextToken(), f)) {
+      return -1;    
+    }
+    if (numArgsFound < aNVars) {
+      aVars[numArgsFound] = f;
+    }
+    numArgsFound++;
+  }
+  return numArgsFound;
+}
+
+nsSMILValue
+nsSVGAnimatedTransformList::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:
+  nsSMILValue val(SVGTransformListSMILType::Singleton());
+  if (!SVGTransformListSMILType::AppendTransforms(mVal->mBaseVal, val)) {
+    val = nsSMILValue();
+  }
+
+  return val;
+}
+
+nsresult
+nsSVGAnimatedTransformList::SMILAnimatedTransformList::SetAnimValue(
+  const nsSMILValue& 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
+nsSVGAnimatedTransformList::SMILAnimatedTransformList::ClearAnimValue()
+{
+  if (mVal->mAnimVal) {
+    mVal->ClearAnimValue(mElement);
+  }
+}
+
+} // namespace mozilla