gecko-dev/dom/svg/SVGAnimatedEnumeration.cpp

/* -*- 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 "SVGAnimatedEnumeration.h"

#include "mozilla/dom/SVGElement.h"
#include "mozilla/SMILValue.h"
#include "nsAtom.h"
#include "nsError.h"
#include "SMILEnumType.h"
#include "SVGAttrTearoffTable.h"

using namespace mozilla::dom;

namespace mozilla {

//----------------------------------------------------------------------
// Helper class: AutoChangeEnumNotifier
// Stack-based helper class to ensure DidChangeEnum is called.
class MOZ_RAII AutoChangeEnumNotifier {
 public:
  AutoChangeEnumNotifier(SVGAnimatedEnumeration* aEnum, SVGElement* aSVGElement,
                         bool aDoSetAttr = true)
      : mEnum(aEnum), mSVGElement(aSVGElement), mDoSetAttr(aDoSetAttr) {
    MOZ_ASSERT(mEnum, "Expecting non-null enum");
    MOZ_ASSERT(mSVGElement, "Expecting non-null element");
  }

  ~AutoChangeEnumNotifier() {
    if (mDoSetAttr) {
      mSVGElement->DidChangeEnum(mEnum->mAttrEnum);
    }
    if (mEnum->mIsAnimated) {
      mSVGElement->AnimationNeedsResample();
    }
  }

 private:
  SVGAnimatedEnumeration* const mEnum;
  SVGElement* const mSVGElement;
  bool mDoSetAttr;
};

static SVGAttrTearoffTable<SVGAnimatedEnumeration,
                           SVGAnimatedEnumeration::DOMAnimatedEnum>
    sSVGAnimatedEnumTearoffTable;

const SVGEnumMapping* SVGAnimatedEnumeration::GetMapping(
    SVGElement* aSVGElement) {
  SVGElement::EnumAttributesInfo info = aSVGElement->GetEnumInfo();

  NS_ASSERTION(info.mCount > 0 && mAttrEnum < info.mCount,
               "mapping request for a non-attrib enum");

  return info.mInfos[mAttrEnum].mMapping;
}

bool SVGAnimatedEnumeration::SetBaseValueAtom(const nsAtom* aValue,
                                              SVGElement* aSVGElement) {
  const SVGEnumMapping* mapping = GetMapping(aSVGElement);

  while (mapping && mapping->mKey) {
    if (aValue == mapping->mKey) {
      if (!mIsBaseSet || mBaseVal != mapping->mVal) {
        mIsBaseSet = true;
        // We don't need to call DidChange* here - we're only called by
        // SVGElement::ParseAttribute under Element::SetAttr,
        // which takes care of notifying.
        AutoChangeEnumNotifier notifier(this, aSVGElement, false);

        mBaseVal = mapping->mVal;
        if (!mIsAnimated) {
          mAnimVal = mBaseVal;
        }
      }
      return true;
    }
    mapping++;
  }

  return false;
}

nsAtom* SVGAnimatedEnumeration::GetBaseValueAtom(SVGElement* aSVGElement) {
  const SVGEnumMapping* mapping = GetMapping(aSVGElement);

  while (mapping && mapping->mKey) {
    if (mBaseVal == mapping->mVal) {
      return mapping->mKey;
    }
    mapping++;
  }
  NS_ERROR("unknown enumeration value");
  return nsGkAtoms::_empty;
}

void SVGAnimatedEnumeration::SetBaseValue(uint16_t aValue,
                                          SVGElement* aSVGElement,
                                          ErrorResult& aRv) {
  const SVGEnumMapping* mapping = GetMapping(aSVGElement);

  while (mapping && mapping->mKey) {
    if (mapping->mVal == aValue) {
      if (!mIsBaseSet || mBaseVal != uint8_t(aValue)) {
        mIsBaseSet = true;
        AutoChangeEnumNotifier notifier(this, aSVGElement);

        mBaseVal = uint8_t(aValue);
        if (!mIsAnimated) {
          mAnimVal = mBaseVal;
        }
      }
      return;
    }
    mapping++;
  }
  return aRv.ThrowTypeError("Invalid SVGAnimatedEnumeration base value");
}

void SVGAnimatedEnumeration::SetAnimValue(uint16_t aValue,
                                          SVGElement* aSVGElement) {
  if (mIsAnimated && aValue == mAnimVal) {
    return;
  }
  mAnimVal = aValue;
  mIsAnimated = true;
  aSVGElement->DidAnimateEnum(mAttrEnum);
}

already_AddRefed<DOMSVGAnimatedEnumeration>
SVGAnimatedEnumeration::ToDOMAnimatedEnum(SVGElement* aSVGElement) {
  RefPtr<DOMAnimatedEnum> domAnimatedEnum =
      sSVGAnimatedEnumTearoffTable.GetTearoff(this);
  if (!domAnimatedEnum) {
    domAnimatedEnum = new DOMAnimatedEnum(this, aSVGElement);
    sSVGAnimatedEnumTearoffTable.AddTearoff(this, domAnimatedEnum);
  }

  return domAnimatedEnum.forget();
}

SVGAnimatedEnumeration::DOMAnimatedEnum::~DOMAnimatedEnum() {
  sSVGAnimatedEnumTearoffTable.RemoveTearoff(mVal);
}

UniquePtr<SMILAttr> SVGAnimatedEnumeration::ToSMILAttr(
    SVGElement* aSVGElement) {
  return MakeUnique<SMILEnum>(this, aSVGElement);
}

nsresult SVGAnimatedEnumeration::SMILEnum::ValueFromString(
    const nsAString& aStr, const SVGAnimationElement* /*aSrcElement*/,
    SMILValue& aValue, bool& aPreventCachingOfSandwich) const {
  nsAtom* valAtom = NS_GetStaticAtom(aStr);
  if (valAtom) {
    const SVGEnumMapping* mapping = mVal->GetMapping(mSVGElement);

    while (mapping && mapping->mKey) {
      if (valAtom == mapping->mKey) {
        SMILValue val(SMILEnumType::Singleton());
        val.mU.mUint = mapping->mVal;
        aValue = val;
        aPreventCachingOfSandwich = false;
        return NS_OK;
      }
      mapping++;
    }
  }

  // only a warning since authors may mistype attribute values
  NS_WARNING("unknown enumeration key");
  return NS_ERROR_FAILURE;
}

SMILValue SVGAnimatedEnumeration::SMILEnum::GetBaseValue() const {
  SMILValue val(SMILEnumType::Singleton());
  val.mU.mUint = mVal->mBaseVal;
  return val;
}

void SVGAnimatedEnumeration::SMILEnum::ClearAnimValue() {
  if (mVal->mIsAnimated) {
    mVal->mIsAnimated = false;
    mVal->mAnimVal = mVal->mBaseVal;
    mSVGElement->DidAnimateEnum(mVal->mAttrEnum);
  }
}

nsresult SVGAnimatedEnumeration::SMILEnum::SetAnimValue(
    const SMILValue& aValue) {
  NS_ASSERTION(aValue.mType == SMILEnumType::Singleton(),
               "Unexpected type to assign animated value");
  if (aValue.mType == SMILEnumType::Singleton()) {
    MOZ_ASSERT(aValue.mU.mUint <= USHRT_MAX,
               "Very large enumerated value - too big for uint16_t");
    mVal->SetAnimValue(uint16_t(aValue.mU.mUint), mSVGElement);
  }
  return NS_OK;
}

}  // namespace mozilla