diff options
Diffstat (limited to 'dom/svg/SVGAnimatedLength.cpp')
| -rw-r--r-- | dom/svg/SVGAnimatedLength.cpp | 474 |
1 files changed, 474 insertions, 0 deletions
diff --git a/dom/svg/SVGAnimatedLength.cpp b/dom/svg/SVGAnimatedLength.cpp new file mode 100644 index 0000000000..0b799c79d8 --- /dev/null +++ b/dom/svg/SVGAnimatedLength.cpp @@ -0,0 +1,474 @@ +/* -*- 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 "SVGAnimatedLength.h" + +#include "mozAutoDocUpdate.h" +#include "mozilla/ArrayUtils.h" +#include "mozilla/Maybe.h" +#include "mozilla/SMILValue.h" +#include "mozilla/SVGIntegrationUtils.h" +#include "mozilla/dom/SVGViewportElement.h" +#include "DOMSVGAnimatedLength.h" +#include "DOMSVGLength.h" +#include "LayoutLogging.h" +#include "nsContentUtils.h" +#include "nsIFrame.h" +#include "nsTextFormatter.h" +#include "SMILFloatType.h" +#include "SVGAttrTearoffTable.h" + +using namespace mozilla::dom; + +namespace mozilla { + +//---------------------------------------------------------------------- +// Helper class: AutoChangeLengthNotifier +// Stack-based helper class to pair calls to WillChangeLength and +// DidChangeLength. +class MOZ_RAII AutoChangeLengthNotifier { + public: + AutoChangeLengthNotifier(SVGAnimatedLength* aLength, SVGElement* aSVGElement, + bool aDoSetAttr = true) + : mLength(aLength), mSVGElement(aSVGElement), mDoSetAttr(aDoSetAttr) { + MOZ_ASSERT(mLength, "Expecting non-null length"); + MOZ_ASSERT(mSVGElement, "Expecting non-null element"); + + if (mDoSetAttr) { + mUpdateBatch.emplace(aSVGElement->GetComposedDoc(), true); + mEmptyOrOldValue = + mSVGElement->WillChangeLength(mLength->mAttrEnum, mUpdateBatch.ref()); + } + } + + ~AutoChangeLengthNotifier() { + if (mDoSetAttr) { + mSVGElement->DidChangeLength(mLength->mAttrEnum, mEmptyOrOldValue, + mUpdateBatch.ref()); + } + if (mLength->mIsAnimated) { + mSVGElement->AnimationNeedsResample(); + } + } + + private: + SVGAnimatedLength* const mLength; + SVGElement* const mSVGElement; + Maybe<mozAutoDocUpdate> mUpdateBatch; + nsAttrValue mEmptyOrOldValue; + bool mDoSetAttr; +}; + +static SVGAttrTearoffTable<SVGAnimatedLength, DOMSVGAnimatedLength> + sSVGAnimatedLengthTearoffTable; + +/* Helper functions */ + +static void GetValueString(nsAString& aValueAsString, float aValue, + uint16_t aUnitType) { + nsTextFormatter::ssprintf(aValueAsString, u"%g", (double)aValue); + + nsAutoString unitString; + SVGLength::GetUnitString(unitString, aUnitType); + aValueAsString.Append(unitString); +} + +static bool GetValueFromString(const nsAString& aString, float& aValue, + uint16_t* aUnitType) { + bool success; + auto token = SVGContentUtils::GetAndEnsureOneToken(aString, success); + + if (!success) { + return false; + } + + RangedPtr<const char16_t> iter = SVGContentUtils::GetStartRangedPtr(token); + const RangedPtr<const char16_t> end = SVGContentUtils::GetEndRangedPtr(token); + + if (!SVGContentUtils::ParseNumber(iter, end, aValue)) { + return false; + } + const nsAString& units = Substring(iter.get(), end.get()); + *aUnitType = SVGLength::GetUnitTypeForString(units); + return *aUnitType != SVGLength_Binding::SVG_LENGTHTYPE_UNKNOWN; +} + +static float FixAxisLength(float aLength) { + if (aLength == 0.0f) { + LAYOUT_WARNING("zero axis length"); + return 1e-20f; + } + return aLength; +} + +SVGElementMetrics::SVGElementMetrics(SVGElement* aSVGElement, + SVGViewportElement* aCtx) + : mSVGElement(aSVGElement), mCtx(aCtx) {} + +float SVGElementMetrics::GetEmLength() const { + return SVGContentUtils::GetFontSize(mSVGElement); +} + +float SVGElementMetrics::GetExLength() const { + return SVGContentUtils::GetFontXHeight(mSVGElement); +} + +float SVGElementMetrics::GetAxisLength(uint8_t aCtxType) const { + if (!EnsureCtx()) { + return 1; + } + + return FixAxisLength(mCtx->GetLength(aCtxType)); +} + +bool SVGElementMetrics::EnsureCtx() const { + if (!mCtx && mSVGElement) { + mCtx = mSVGElement->GetCtx(); + if (!mCtx && mSVGElement->IsSVGElement(nsGkAtoms::svg)) { + auto* e = static_cast<SVGViewportElement*>(mSVGElement); + + if (!e->IsInner()) { + // mSVGElement must be the outer svg element + mCtx = e; + } + } + } + return mCtx != nullptr; +} + +NonSVGFrameUserSpaceMetrics::NonSVGFrameUserSpaceMetrics(nsIFrame* aFrame) + : mFrame(aFrame) {} + +float NonSVGFrameUserSpaceMetrics::GetEmLength() const { + return SVGContentUtils::GetFontSize(mFrame); +} + +float NonSVGFrameUserSpaceMetrics::GetExLength() const { + return SVGContentUtils::GetFontXHeight(mFrame); +} + +gfx::Size NonSVGFrameUserSpaceMetrics::GetSize() const { + return SVGIntegrationUtils::GetSVGCoordContextForNonSVGFrame(mFrame); +} + +float UserSpaceMetricsWithSize::GetAxisLength(uint8_t aCtxType) const { + gfx::Size size = GetSize(); + float length; + switch (aCtxType) { + case SVGContentUtils::X: + length = size.width; + break; + case SVGContentUtils::Y: + length = size.height; + break; + case SVGContentUtils::XY: + length = + SVGContentUtils::ComputeNormalizedHypotenuse(size.width, size.height); + break; + default: + MOZ_ASSERT_UNREACHABLE("Unknown axis type"); + length = 1; + break; + } + return FixAxisLength(length); +} + +float SVGAnimatedLength::GetPixelsPerUnit(SVGElement* aSVGElement, + uint8_t aUnitType) const { + return GetPixelsPerUnit(SVGElementMetrics(aSVGElement), aUnitType); +} + +float SVGAnimatedLength::GetPixelsPerUnit(SVGViewportElement* aCtx, + uint8_t aUnitType) const { + return GetPixelsPerUnit(SVGElementMetrics(aCtx, aCtx), aUnitType); +} + +float SVGAnimatedLength::GetPixelsPerUnit(nsIFrame* aFrame, + uint8_t aUnitType) const { + nsIContent* content = aFrame->GetContent(); + MOZ_ASSERT(!content->IsText(), "Not expecting text content"); + if (content->IsSVGElement()) { + return GetPixelsPerUnit( + SVGElementMetrics(static_cast<SVGElement*>(content)), aUnitType); + } + return GetPixelsPerUnit(NonSVGFrameUserSpaceMetrics(aFrame), aUnitType); +} + +// See https://www.w3.org/TR/css-values-3/#absolute-lengths +static const float DPI = 96.0f; + +bool UserSpaceMetrics::ResolveAbsoluteUnit(uint8_t aUnitType, float& aRes) { + switch (aUnitType) { + case SVGLength_Binding::SVG_LENGTHTYPE_NUMBER: + case SVGLength_Binding::SVG_LENGTHTYPE_PX: + aRes = 1; + break; + case SVGLength_Binding::SVG_LENGTHTYPE_MM: + aRes = DPI / MM_PER_INCH_FLOAT; + break; + case SVGLength_Binding::SVG_LENGTHTYPE_CM: + aRes = 10.0f * DPI / MM_PER_INCH_FLOAT; + break; + case SVGLength_Binding::SVG_LENGTHTYPE_IN: + aRes = DPI; + break; + case SVGLength_Binding::SVG_LENGTHTYPE_PT: + aRes = DPI / POINTS_PER_INCH_FLOAT; + break; + case SVGLength_Binding::SVG_LENGTHTYPE_PC: + aRes = 12.0f * DPI / POINTS_PER_INCH_FLOAT; + break; + default: + return false; + } + return true; +} + +float SVGAnimatedLength::GetPixelsPerUnit(const UserSpaceMetrics& aMetrics, + uint8_t aUnitType) const { + float res; + if (UserSpaceMetrics::ResolveAbsoluteUnit(aUnitType, res)) { + return res; + } + switch (aUnitType) { + case SVGLength_Binding::SVG_LENGTHTYPE_PERCENTAGE: + return aMetrics.GetAxisLength(mCtxType) / 100.0f; + case SVGLength_Binding::SVG_LENGTHTYPE_EMS: + return aMetrics.GetEmLength(); + case SVGLength_Binding::SVG_LENGTHTYPE_EXS: + return aMetrics.GetExLength(); + default: + MOZ_ASSERT_UNREACHABLE("Unknown unit type"); + return 0; + } +} + +void SVGAnimatedLength::SetBaseValueInSpecifiedUnits(float aValue, + SVGElement* aSVGElement, + bool aDoSetAttr) { + if (mIsBaseSet && mBaseVal == aValue) { + return; + } + + AutoChangeLengthNotifier notifier(this, aSVGElement, aDoSetAttr); + + mBaseVal = aValue; + mIsBaseSet = true; + if (!mIsAnimated) { + mAnimVal = mBaseVal; + } +} + +nsresult SVGAnimatedLength::ConvertToSpecifiedUnits(uint16_t unitType, + SVGElement* aSVGElement) { + if (!SVGLength::IsValidUnitType(unitType)) { + return NS_ERROR_DOM_NOT_SUPPORTED_ERR; + } + + if (mIsBaseSet && mSpecifiedUnitType == uint8_t(unitType)) return NS_OK; + + float pixelsPerUnit = GetPixelsPerUnit(aSVGElement, unitType); + if (pixelsPerUnit == 0.0f) { + return NS_ERROR_ILLEGAL_VALUE; + } + + float valueInUserUnits = + mBaseVal * GetPixelsPerUnit(aSVGElement, mSpecifiedUnitType); + float valueInSpecifiedUnits = valueInUserUnits / pixelsPerUnit; + + if (!std::isfinite(valueInSpecifiedUnits)) { + return NS_ERROR_ILLEGAL_VALUE; + } + + // Even though we're not changing the visual effect this length will have + // on the document, we still need to send out notifications in case we have + // mutation listeners, since the actual string value of the attribute will + // change. + AutoChangeLengthNotifier notifier(this, aSVGElement); + + mSpecifiedUnitType = uint8_t(unitType); + // Setting aDoSetAttr to false here will ensure we don't call + // Will/DidChangeAngle a second time (and dispatch duplicate notifications). + SetBaseValueInSpecifiedUnits(valueInSpecifiedUnits, aSVGElement, false); + + return NS_OK; +} + +nsresult SVGAnimatedLength::NewValueSpecifiedUnits(uint16_t aUnitType, + float aValueInSpecifiedUnits, + SVGElement* aSVGElement) { + NS_ENSURE_FINITE(aValueInSpecifiedUnits, NS_ERROR_ILLEGAL_VALUE); + + if (!SVGLength::IsValidUnitType(aUnitType)) { + return NS_ERROR_DOM_NOT_SUPPORTED_ERR; + } + + if (mIsBaseSet && mBaseVal == aValueInSpecifiedUnits && + mSpecifiedUnitType == uint8_t(aUnitType)) { + return NS_OK; + } + + AutoChangeLengthNotifier notifier(this, aSVGElement); + + mBaseVal = aValueInSpecifiedUnits; + mIsBaseSet = true; + mSpecifiedUnitType = uint8_t(aUnitType); + if (!mIsAnimated) { + mAnimVal = mBaseVal; + } + return NS_OK; +} + +already_AddRefed<DOMSVGLength> SVGAnimatedLength::ToDOMBaseVal( + SVGElement* aSVGElement) { + return DOMSVGLength::GetTearOff(this, aSVGElement, false); +} + +already_AddRefed<DOMSVGLength> SVGAnimatedLength::ToDOMAnimVal( + SVGElement* aSVGElement) { + return DOMSVGLength::GetTearOff(this, aSVGElement, true); +} + +/* Implementation */ + +nsresult SVGAnimatedLength::SetBaseValueString(const nsAString& aValueAsString, + SVGElement* aSVGElement, + bool aDoSetAttr) { + float value; + uint16_t unitType; + + if (!GetValueFromString(aValueAsString, value, &unitType)) { + return NS_ERROR_DOM_SYNTAX_ERR; + } + + if (mIsBaseSet && mBaseVal == float(value) && + mSpecifiedUnitType == uint8_t(unitType)) { + return NS_OK; + } + + AutoChangeLengthNotifier notifier(this, aSVGElement, aDoSetAttr); + + mBaseVal = value; + mIsBaseSet = true; + mSpecifiedUnitType = uint8_t(unitType); + if (!mIsAnimated) { + mAnimVal = mBaseVal; + } + + return NS_OK; +} + +void SVGAnimatedLength::GetBaseValueString(nsAString& aValueAsString) const { + GetValueString(aValueAsString, mBaseVal, mSpecifiedUnitType); +} + +void SVGAnimatedLength::GetAnimValueString(nsAString& aValueAsString) const { + GetValueString(aValueAsString, mAnimVal, mSpecifiedUnitType); +} + +nsresult SVGAnimatedLength::SetBaseValue(float aValue, SVGElement* aSVGElement, + bool aDoSetAttr) { + float pixelsPerUnit = GetPixelsPerUnit(aSVGElement, mSpecifiedUnitType); + if (pixelsPerUnit == 0.0f) { + return NS_ERROR_ILLEGAL_VALUE; + } + + float valueInSpecifiedUnits = aValue / pixelsPerUnit; + if (!std::isfinite(valueInSpecifiedUnits)) { + return NS_ERROR_ILLEGAL_VALUE; + } + + SetBaseValueInSpecifiedUnits(valueInSpecifiedUnits, aSVGElement, aDoSetAttr); + return NS_OK; +} + +void SVGAnimatedLength::SetAnimValueInSpecifiedUnits(float aValue, + SVGElement* aSVGElement) { + if (mAnimVal == aValue && mIsAnimated) { + return; + } + mAnimVal = aValue; + mIsAnimated = true; + aSVGElement->DidAnimateLength(mAttrEnum); +} + +nsresult SVGAnimatedLength::SetAnimValue(float aValue, + SVGElement* aSVGElement) { + float valueInSpecifiedUnits = + aValue / GetPixelsPerUnit(aSVGElement, mSpecifiedUnitType); + + if (std::isfinite(valueInSpecifiedUnits)) { + SetAnimValueInSpecifiedUnits(valueInSpecifiedUnits, aSVGElement); + return NS_OK; + } + return NS_ERROR_ILLEGAL_VALUE; +} + +already_AddRefed<DOMSVGAnimatedLength> SVGAnimatedLength::ToDOMAnimatedLength( + SVGElement* aSVGElement) { + RefPtr<DOMSVGAnimatedLength> svgAnimatedLength = + sSVGAnimatedLengthTearoffTable.GetTearoff(this); + if (!svgAnimatedLength) { + svgAnimatedLength = new DOMSVGAnimatedLength(this, aSVGElement); + sSVGAnimatedLengthTearoffTable.AddTearoff(this, svgAnimatedLength); + } + + return svgAnimatedLength.forget(); +} + +DOMSVGAnimatedLength::~DOMSVGAnimatedLength() { + sSVGAnimatedLengthTearoffTable.RemoveTearoff(mVal); +} + +UniquePtr<SMILAttr> SVGAnimatedLength::ToSMILAttr(SVGElement* aSVGElement) { + return MakeUnique<SMILLength>(this, aSVGElement); +} + +nsresult SVGAnimatedLength::SMILLength::ValueFromString( + const nsAString& aStr, const SVGAnimationElement* /*aSrcElement*/, + SMILValue& aValue, bool& aPreventCachingOfSandwich) const { + float value; + uint16_t unitType; + + if (!GetValueFromString(aStr, value, &unitType)) { + return NS_ERROR_DOM_SYNTAX_ERR; + } + + SMILValue val(SMILFloatType::Singleton()); + val.mU.mDouble = value * mVal->GetPixelsPerUnit(mSVGElement, unitType); + aValue = val; + aPreventCachingOfSandwich = + (unitType == SVGLength_Binding::SVG_LENGTHTYPE_PERCENTAGE || + unitType == SVGLength_Binding::SVG_LENGTHTYPE_EMS || + unitType == SVGLength_Binding::SVG_LENGTHTYPE_EXS); + + return NS_OK; +} + +SMILValue SVGAnimatedLength::SMILLength::GetBaseValue() const { + SMILValue val(SMILFloatType::Singleton()); + val.mU.mDouble = mVal->GetBaseValue(mSVGElement); + return val; +} + +void SVGAnimatedLength::SMILLength::ClearAnimValue() { + if (mVal->mIsAnimated) { + mVal->mIsAnimated = false; + mVal->mAnimVal = mVal->mBaseVal; + mSVGElement->DidAnimateLength(mVal->mAttrEnum); + } +} + +nsresult SVGAnimatedLength::SMILLength::SetAnimValue(const SMILValue& aValue) { + NS_ASSERTION(aValue.mType == SMILFloatType::Singleton(), + "Unexpected type to assign animated value"); + if (aValue.mType == SMILFloatType::Singleton()) { + return mVal->SetAnimValue(float(aValue.mU.mDouble), mSVGElement); + } + return NS_OK; +} + +} // namespace mozilla |