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Diffstat (limited to '')
| -rw-r--r-- | dom/svg/SVGAnimatedLength.h | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/dom/svg/SVGAnimatedLength.h b/dom/svg/SVGAnimatedLength.h new file mode 100644 index 0000000000..1cabfba040 --- /dev/null +++ b/dom/svg/SVGAnimatedLength.h @@ -0,0 +1,221 @@ +/* -*- 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/. */ + +#ifndef DOM_SVG_SVGANIMATEDLENGTH_H_ +#define DOM_SVG_SVGANIMATEDLENGTH_H_ + +#include "mozilla/Attributes.h" +#include "mozilla/SMILAttr.h" +#include "mozilla/SVGContentUtils.h" +#include "mozilla/UniquePtr.h" +#include "mozilla/dom/SVGLengthBinding.h" +#include "mozilla/dom/SVGElement.h" +#include "mozilla/gfx/Rect.h" +#include "nsCoord.h" +#include "nsCycleCollectionParticipant.h" +#include "nsError.h" +#include "nsMathUtils.h" + +class mozAutoDocUpdate; +class nsIFrame; + +namespace mozilla { + +class AutoChangeLengthNotifier; +class SMILValue; + +namespace dom { +class DOMSVGAnimatedLength; +class DOMSVGLength; +class SVGAnimationElement; +class SVGViewportElement; + +class UserSpaceMetrics { + public: + static bool ResolveAbsoluteUnit(uint8_t aUnitType, float& aRes); + virtual ~UserSpaceMetrics() = default; + + virtual float GetEmLength() const = 0; + virtual float GetExLength() const = 0; + virtual float GetAxisLength(uint8_t aCtxType) const = 0; +}; + +class UserSpaceMetricsWithSize : public UserSpaceMetrics { + public: + virtual gfx::Size GetSize() const = 0; + float GetAxisLength(uint8_t aCtxType) const override; +}; + +class SVGElementMetrics : public UserSpaceMetrics { + public: + explicit SVGElementMetrics(SVGElement* aSVGElement, + SVGViewportElement* aCtx = nullptr); + + float GetEmLength() const override; + float GetExLength() const override; + float GetAxisLength(uint8_t aCtxType) const override; + + private: + bool EnsureCtx() const; + + SVGElement* mSVGElement; + mutable SVGViewportElement* mCtx; +}; + +class NonSVGFrameUserSpaceMetrics : public UserSpaceMetricsWithSize { + public: + explicit NonSVGFrameUserSpaceMetrics(nsIFrame* aFrame); + + float GetEmLength() const override; + float GetExLength() const override; + gfx::Size GetSize() const override; + + private: + nsIFrame* mFrame; +}; + +} // namespace dom + +class SVGAnimatedLength { + friend class AutoChangeLengthNotifier; + friend class dom::DOMSVGAnimatedLength; + friend class dom::DOMSVGLength; + using DOMSVGLength = dom::DOMSVGLength; + using SVGElement = dom::SVGElement; + using SVGViewportElement = dom::SVGViewportElement; + using UserSpaceMetrics = dom::UserSpaceMetrics; + + public: + void Init(uint8_t aCtxType = SVGContentUtils::XY, uint8_t aAttrEnum = 0xff, + float aValue = 0, + uint8_t aUnitType = dom::SVGLength_Binding::SVG_LENGTHTYPE_NUMBER) { + mAnimVal = mBaseVal = aValue; + mSpecifiedUnitType = aUnitType; + mAttrEnum = aAttrEnum; + mCtxType = aCtxType; + mIsAnimated = false; + mIsBaseSet = false; + } + + SVGAnimatedLength& operator=(const SVGAnimatedLength& aLength) { + mBaseVal = aLength.mBaseVal; + mAnimVal = aLength.mAnimVal; + mSpecifiedUnitType = aLength.mSpecifiedUnitType; + mIsAnimated = aLength.mIsAnimated; + mIsBaseSet = aLength.mIsBaseSet; + return *this; + } + + nsresult SetBaseValueString(const nsAString& aValue, SVGElement* aSVGElement, + bool aDoSetAttr); + void GetBaseValueString(nsAString& aValue) const; + void GetAnimValueString(nsAString& aValue) const; + + float GetBaseValue(SVGElement* aSVGElement) const { + return mBaseVal * GetPixelsPerUnit(aSVGElement, mSpecifiedUnitType); + } + + float GetAnimValue(SVGElement* aSVGElement) const { + return mAnimVal * GetPixelsPerUnit(aSVGElement, mSpecifiedUnitType); + } + float GetAnimValue(nsIFrame* aFrame) const { + return mAnimVal * GetPixelsPerUnit(aFrame, mSpecifiedUnitType); + } + float GetAnimValue(SVGViewportElement* aCtx) const { + return mAnimVal * GetPixelsPerUnit(aCtx, mSpecifiedUnitType); + } + float GetAnimValue(const UserSpaceMetrics& aMetrics) const { + return mAnimVal * GetPixelsPerUnit(aMetrics, mSpecifiedUnitType); + } + + uint8_t GetCtxType() const { return mCtxType; } + uint8_t GetSpecifiedUnitType() const { return mSpecifiedUnitType; } + bool IsPercentage() const { + return mSpecifiedUnitType == + dom::SVGLength_Binding::SVG_LENGTHTYPE_PERCENTAGE; + } + float GetAnimValInSpecifiedUnits() const { return mAnimVal; } + float GetBaseValInSpecifiedUnits() const { return mBaseVal; } + + float GetBaseValue(SVGViewportElement* aCtx) const { + return mBaseVal * GetPixelsPerUnit(aCtx, mSpecifiedUnitType); + } + + bool HasBaseVal() const { return mIsBaseSet; } + // Returns true if the animated value of this length has been explicitly + // set (either by animation, or by taking on the base value which has been + // explicitly set by markup or a DOM call), false otherwise. + // If this returns false, the animated value is still valid, that is, + // usable, and represents the default base value of the attribute. + bool IsExplicitlySet() const { return mIsAnimated || mIsBaseSet; } + + bool IsAnimated() const { return mIsAnimated; } + + already_AddRefed<dom::DOMSVGAnimatedLength> ToDOMAnimatedLength( + SVGElement* aSVGElement); + + UniquePtr<SMILAttr> ToSMILAttr(SVGElement* aSVGElement); + + private: + float mAnimVal; + float mBaseVal; + uint8_t mSpecifiedUnitType; + uint8_t mAttrEnum; // element specified tracking for attribute + uint8_t mCtxType; // X, Y or Unspecified + bool mIsAnimated : 1; + bool mIsBaseSet : 1; + + // These APIs returns the number of user-unit pixels per unit of the + // given type, in a given context (frame/element/etc). + float GetPixelsPerUnit(nsIFrame* aFrame, uint8_t aUnitType) const; + float GetPixelsPerUnit(const UserSpaceMetrics& aMetrics, + uint8_t aUnitType) const; + float GetPixelsPerUnit(SVGElement* aSVGElement, uint8_t aUnitType) const; + float GetPixelsPerUnit(SVGViewportElement* aCtx, uint8_t aUnitType) const; + + // SetBaseValue and SetAnimValue set the value in user units. This may fail + // if unit conversion fails e.g. conversion to ex or em units where the + // font-size is 0. + // SetBaseValueInSpecifiedUnits and SetAnimValueInSpecifiedUnits do not + // perform unit conversion and are therefore infallible. + nsresult SetBaseValue(float aValue, SVGElement* aSVGElement, bool aDoSetAttr); + void SetBaseValueInSpecifiedUnits(float aValue, SVGElement* aSVGElement, + bool aDoSetAttr); + nsresult SetAnimValue(float aValue, SVGElement* aSVGElement); + void SetAnimValueInSpecifiedUnits(float aValue, SVGElement* aSVGElement); + nsresult NewValueSpecifiedUnits(uint16_t aUnitType, + float aValueInSpecifiedUnits, + SVGElement* aSVGElement); + nsresult ConvertToSpecifiedUnits(uint16_t aUnitType, SVGElement* aSVGElement); + already_AddRefed<DOMSVGLength> ToDOMBaseVal(SVGElement* aSVGElement); + already_AddRefed<DOMSVGLength> ToDOMAnimVal(SVGElement* aSVGElement); + + public: + struct SMILLength : public SMILAttr { + public: + SMILLength(SVGAnimatedLength* aVal, SVGElement* aSVGElement) + : mVal(aVal), mSVGElement(aSVGElement) {} + + // These will stay alive because a SMILAttr only lives as long + // as the Compositing step, and DOM elements don't get a chance to + // die during that. + SVGAnimatedLength* mVal; + SVGElement* mSVGElement; + + // SMILAttr methods + nsresult ValueFromString(const nsAString& aStr, + const dom::SVGAnimationElement* aSrcElement, + SMILValue& aValue, + bool& aPreventCachingOfSandwich) const override; + SMILValue GetBaseValue() const override; + void ClearAnimValue() override; + nsresult SetAnimValue(const SMILValue& aValue) override; + }; +}; + +} // namespace mozilla + +#endif // DOM_SVG_SVGANIMATEDLENGTH_H_ |