tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
Log | Files | Refs | README | LICENSE

SVGAnimatedNumberPair.h (4430B)

      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 #ifndef DOM_SVG_SVGANIMATEDNUMBERPAIR_H_
      8 #define DOM_SVG_SVGANIMATEDNUMBERPAIR_H_
      9 
     10 #include "DOMSVGAnimatedNumber.h"
     11 #include "mozilla/SMILAttr.h"
     12 #include "mozilla/UniquePtr.h"
     13 #include "nsCycleCollectionParticipant.h"
     14 #include "nsError.h"
     15 #include "nsMathUtils.h"
     16 
     17 namespace mozilla {
     18 
     19 class SMILValue;
     20 
     21 namespace dom {
     22 class SVGAnimationElement;
     23 class SVGElement;
     24 }  // namespace dom
     25 
     26 class SVGAnimatedNumberPair {
     27 public:
     28  friend class AutoChangeNumberPairNotifier;
     29  using SVGElement = dom::SVGElement;
     30 
     31  enum PairIndex { eFirst, eSecond };
     32 
     33  void Init(uint8_t aAttrEnum = 0xff, float aValue1 = 0, float aValue2 = 0) {
     34    mAnimVal[0] = mBaseVal[0] = aValue1;
     35    mAnimVal[1] = mBaseVal[1] = aValue2;
     36    mAttrEnum = aAttrEnum;
     37    mIsAnimated = false;
     38    mIsBaseSet = false;
     39  }
     40 
     41  nsresult SetBaseValueString(const nsAString& aValue, SVGElement* aSVGElement);
     42  void GetBaseValueString(nsAString& aValue) const;
     43 
     44  void SetBaseValue(float aValue, PairIndex aPairIndex,
     45                    SVGElement* aSVGElement);
     46  void SetBaseValues(float aValue1, float aValue2, SVGElement* aSVGElement);
     47  float GetBaseValue(PairIndex aIndex) const {
     48    return mBaseVal[aIndex == eFirst ? 0 : 1];
     49  }
     50  void SetAnimValue(const float aValue[2], SVGElement* aSVGElement);
     51  float GetAnimValue(PairIndex aIndex) const {
     52    return mAnimVal[aIndex == eFirst ? 0 : 1];
     53  }
     54 
     55  // Returns true if the animated value of this number has been explicitly
     56  // set (either by animation, or by taking on the base value which has been
     57  // explicitly set by markup or a DOM call), false otherwise.
     58  // If this returns false, the animated value is still valid, that is,
     59  // usable, and represents the default base value of the attribute.
     60  bool IsExplicitlySet() const { return mIsAnimated || mIsBaseSet; }
     61 
     62  already_AddRefed<dom::DOMSVGAnimatedNumber> ToDOMAnimatedNumber(
     63      PairIndex aIndex, SVGElement* aSVGElement);
     64  UniquePtr<SMILAttr> ToSMILAttr(SVGElement* aSVGElement);
     65 
     66 private:
     67  float mAnimVal[2];
     68  float mBaseVal[2];
     69  uint8_t mAttrEnum;  // element specified tracking for attribute
     70  bool mIsAnimated;
     71  bool mIsBaseSet;
     72 
     73 public:
     74  // DOM wrapper class for the (DOM)SVGAnimatedNumber interface where the
     75  // wrapped class is SVGAnimatedNumberPair.
     76  struct DOMAnimatedNumber final : public dom::DOMSVGAnimatedNumber {
     77    DOMAnimatedNumber(SVGAnimatedNumberPair* aVal, PairIndex aIndex,
     78                      SVGElement* aSVGElement)
     79        : dom::DOMSVGAnimatedNumber(aSVGElement), mVal(aVal), mIndex(aIndex) {}
     80    virtual ~DOMAnimatedNumber();
     81 
     82    SVGAnimatedNumberPair* mVal;  // kept alive because it belongs to content
     83    PairIndex mIndex;             // are we the first or second number
     84 
     85    float BaseVal() override { return mVal->GetBaseValue(mIndex); }
     86    void SetBaseVal(float aValue) override {
     87      MOZ_ASSERT(std::isfinite(aValue));
     88      mVal->SetBaseValue(aValue, mIndex, mSVGElement);
     89    }
     90 
     91    // Script may have modified animation parameters or timeline -- DOM getters
     92    // need to flush any resample requests to reflect these modifications.
     93    float AnimVal() override {
     94      mSVGElement->FlushAnimations();
     95      return mVal->GetAnimValue(mIndex);
     96    }
     97  };
     98 
     99  struct SMILNumberPair : public SMILAttr {
    100   public:
    101    SMILNumberPair(SVGAnimatedNumberPair* aVal, SVGElement* aSVGElement)
    102        : mVal(aVal), mSVGElement(aSVGElement) {}
    103 
    104    // These will stay alive because a SMILAttr only lives as long
    105    // as the Compositing step, and DOM elements don't get a chance to
    106    // die during that.
    107    SVGAnimatedNumberPair* mVal;
    108    SVGElement* mSVGElement;
    109 
    110    // SMILAttr methods
    111    nsresult ValueFromString(const nsAString& aStr,
    112                             const dom::SVGAnimationElement* aSrcElement,
    113                             SMILValue& aValue,
    114                             bool& aPreventCachingOfSandwich) const override;
    115    SMILValue GetBaseValue() const override;
    116    void ClearAnimValue() override;
    117    nsresult SetAnimValue(const SMILValue& aValue) override;
    118  };
    119 };
    120 
    121 }  // namespace mozilla
    122 
    123 #endif  // DOM_SVG_SVGANIMATEDNUMBERPAIR_H_