forked from mirrors/gecko-dev
438 lines
14 KiB
C++
438 lines
14 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "SVGAnimatedLength.h"
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#include "mozAutoDocUpdate.h"
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#include "mozilla/ArrayUtils.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/SMILValue.h"
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#include "mozilla/SVGIntegrationUtils.h"
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#include "mozilla/dom/SVGViewportElement.h"
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#include "DOMSVGAnimatedLength.h"
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#include "DOMSVGLength.h"
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#include "LayoutLogging.h"
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#include "nsContentUtils.h"
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#include "nsIFrame.h"
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#include "nsTextFormatter.h"
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#include "SMILFloatType.h"
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#include "SVGAttrTearoffTable.h"
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using namespace mozilla::dom;
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namespace mozilla {
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//----------------------------------------------------------------------
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// Helper class: AutoChangeLengthNotifier
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// Stack-based helper class to pair calls to WillChangeLength and
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// DidChangeLength.
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class MOZ_RAII AutoChangeLengthNotifier {
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public:
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AutoChangeLengthNotifier(SVGAnimatedLength* aLength, SVGElement* aSVGElement,
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bool aDoSetAttr = true)
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: mLength(aLength), mSVGElement(aSVGElement), mDoSetAttr(aDoSetAttr) {
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MOZ_ASSERT(mLength, "Expecting non-null length");
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MOZ_ASSERT(mSVGElement, "Expecting non-null element");
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if (mDoSetAttr) {
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mUpdateBatch.emplace(aSVGElement->GetComposedDoc(), true);
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mEmptyOrOldValue =
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mSVGElement->WillChangeLength(mLength->mAttrEnum, mUpdateBatch.ref());
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}
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}
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~AutoChangeLengthNotifier() {
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if (mDoSetAttr) {
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mSVGElement->DidChangeLength(mLength->mAttrEnum, mEmptyOrOldValue,
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mUpdateBatch.ref());
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}
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if (mLength->mIsAnimated) {
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mSVGElement->AnimationNeedsResample();
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}
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}
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private:
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SVGAnimatedLength* const mLength;
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SVGElement* const mSVGElement;
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Maybe<mozAutoDocUpdate> mUpdateBatch;
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nsAttrValue mEmptyOrOldValue;
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bool mDoSetAttr;
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};
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static SVGAttrTearoffTable<SVGAnimatedLength, DOMSVGAnimatedLength>
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sSVGAnimatedLengthTearoffTable;
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/* Helper functions */
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static void GetValueString(nsAString& aValueAsString, float aValue,
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uint16_t aUnitType) {
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nsTextFormatter::ssprintf(aValueAsString, u"%g", (double)aValue);
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nsAutoString unitString;
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SVGLength::GetUnitString(unitString, aUnitType);
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aValueAsString.Append(unitString);
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}
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static bool GetValueFromString(const nsAString& aString, float& aValue,
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uint16_t* aUnitType) {
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bool success;
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auto token = SVGContentUtils::GetAndEnsureOneToken(aString, success);
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if (!success) {
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return false;
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}
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RangedPtr<const char16_t> iter = SVGContentUtils::GetStartRangedPtr(token);
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const RangedPtr<const char16_t> end = SVGContentUtils::GetEndRangedPtr(token);
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if (!SVGContentUtils::ParseNumber(iter, end, aValue)) {
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return false;
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}
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const nsAString& units = Substring(iter.get(), end.get());
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*aUnitType = SVGLength::GetUnitTypeForString(units);
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return *aUnitType != SVGLength_Binding::SVG_LENGTHTYPE_UNKNOWN;
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}
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static float FixAxisLength(float aLength) {
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if (aLength == 0.0f) {
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LAYOUT_WARNING("zero axis length");
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return 1e-20f;
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}
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return aLength;
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}
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SVGElementMetrics::SVGElementMetrics(const SVGElement* aSVGElement,
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const SVGViewportElement* aCtx)
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: mSVGElement(aSVGElement), mCtx(aCtx) {}
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float SVGElementMetrics::GetEmLength() const {
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return SVGContentUtils::GetFontSize(mSVGElement);
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}
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float SVGElementMetrics::GetExLength() const {
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return SVGContentUtils::GetFontXHeight(mSVGElement);
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}
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float SVGElementMetrics::GetAxisLength(uint8_t aCtxType) const {
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if (!EnsureCtx()) {
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return 1;
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}
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return FixAxisLength(mCtx->GetLength(aCtxType));
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}
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bool SVGElementMetrics::EnsureCtx() const {
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if (!mCtx && mSVGElement) {
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mCtx = mSVGElement->GetCtx();
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if (!mCtx && mSVGElement->IsSVGElement(nsGkAtoms::svg)) {
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const auto* e = static_cast<const SVGViewportElement*>(mSVGElement);
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if (!e->IsInner()) {
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// mSVGElement must be the outer svg element
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mCtx = e;
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}
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}
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}
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return mCtx != nullptr;
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}
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NonSVGFrameUserSpaceMetrics::NonSVGFrameUserSpaceMetrics(nsIFrame* aFrame)
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: mFrame(aFrame) {}
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float NonSVGFrameUserSpaceMetrics::GetEmLength() const {
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return SVGContentUtils::GetFontSize(mFrame);
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}
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float NonSVGFrameUserSpaceMetrics::GetExLength() const {
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return SVGContentUtils::GetFontXHeight(mFrame);
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}
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gfx::Size NonSVGFrameUserSpaceMetrics::GetSize() const {
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return SVGIntegrationUtils::GetSVGCoordContextForNonSVGFrame(mFrame);
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}
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float UserSpaceMetricsWithSize::GetAxisLength(uint8_t aCtxType) const {
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gfx::Size size = GetSize();
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float length;
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switch (aCtxType) {
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case SVGContentUtils::X:
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length = size.width;
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break;
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case SVGContentUtils::Y:
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length = size.height;
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break;
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case SVGContentUtils::XY:
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length =
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SVGContentUtils::ComputeNormalizedHypotenuse(size.width, size.height);
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break;
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default:
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MOZ_ASSERT_UNREACHABLE("Unknown axis type");
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length = 1;
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break;
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}
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return FixAxisLength(length);
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}
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float SVGAnimatedLength::GetPixelsPerUnit(const SVGElement* aSVGElement,
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uint8_t aUnitType) const {
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return SVGLength::GetPixelsPerUnit(SVGElementMetrics(aSVGElement), aUnitType,
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mCtxType);
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}
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float SVGAnimatedLength::GetPixelsPerUnit(const SVGViewportElement* aCtx,
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uint8_t aUnitType) const {
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return SVGLength::GetPixelsPerUnit(SVGElementMetrics(aCtx, aCtx), aUnitType,
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mCtxType);
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}
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float SVGAnimatedLength::GetPixelsPerUnit(nsIFrame* aFrame,
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uint8_t aUnitType) const {
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const nsIContent* content = aFrame->GetContent();
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MOZ_ASSERT(!content->IsText(), "Not expecting text content");
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if (content->IsSVGElement()) {
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return SVGLength::GetPixelsPerUnit(
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SVGElementMetrics(static_cast<const SVGElement*>(content)), aUnitType,
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mCtxType);
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}
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return SVGLength::GetPixelsPerUnit(NonSVGFrameUserSpaceMetrics(aFrame),
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aUnitType, mCtxType);
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}
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float SVGAnimatedLength::GetPixelsPerUnit(const UserSpaceMetrics& aMetrics,
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uint8_t aUnitType) const {
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return SVGLength::GetPixelsPerUnit(aMetrics, aUnitType, mCtxType);
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}
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void SVGAnimatedLength::SetBaseValueInSpecifiedUnits(float aValue,
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SVGElement* aSVGElement,
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bool aDoSetAttr) {
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if (mIsBaseSet && mBaseVal == aValue) {
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return;
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}
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AutoChangeLengthNotifier notifier(this, aSVGElement, aDoSetAttr);
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mBaseVal = aValue;
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mIsBaseSet = true;
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if (!mIsAnimated) {
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mAnimVal = mBaseVal;
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}
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}
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nsresult SVGAnimatedLength::ConvertToSpecifiedUnits(uint16_t unitType,
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SVGElement* aSVGElement) {
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if (!SVGLength::IsValidUnitType(unitType)) {
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return NS_ERROR_DOM_NOT_SUPPORTED_ERR;
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}
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if (mIsBaseSet && mSpecifiedUnitType == uint8_t(unitType)) return NS_OK;
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float valueInSpecifiedUnits;
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if (SVGLength::IsAbsoluteUnit(unitType) &&
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SVGLength::IsAbsoluteUnit(mSpecifiedUnitType)) {
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valueInSpecifiedUnits = mBaseVal * SVGLength::GetAbsUnitsPerAbsUnit(
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unitType, mSpecifiedUnitType);
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} else {
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float pixelsPerUnit = GetPixelsPerUnit(aSVGElement, unitType);
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if (pixelsPerUnit == 0.0f) {
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return NS_ERROR_ILLEGAL_VALUE;
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}
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float valueInPixels =
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mBaseVal * GetPixelsPerUnit(aSVGElement, mSpecifiedUnitType);
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valueInSpecifiedUnits = valueInPixels / pixelsPerUnit;
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}
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if (!std::isfinite(valueInSpecifiedUnits)) {
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return NS_ERROR_ILLEGAL_VALUE;
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}
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// Even though we're not changing the visual effect this length will have
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// on the document, we still need to send out notifications in case we have
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// mutation listeners, since the actual string value of the attribute will
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// change.
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AutoChangeLengthNotifier notifier(this, aSVGElement);
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mSpecifiedUnitType = uint8_t(unitType);
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// Setting aDoSetAttr to false here will ensure we don't call
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// Will/DidChangeAngle a second time (and dispatch duplicate notifications).
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SetBaseValueInSpecifiedUnits(valueInSpecifiedUnits, aSVGElement, false);
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return NS_OK;
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}
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nsresult SVGAnimatedLength::NewValueSpecifiedUnits(uint16_t aUnitType,
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float aValueInSpecifiedUnits,
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SVGElement* aSVGElement) {
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NS_ENSURE_FINITE(aValueInSpecifiedUnits, NS_ERROR_ILLEGAL_VALUE);
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if (!SVGLength::IsValidUnitType(aUnitType)) {
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return NS_ERROR_DOM_NOT_SUPPORTED_ERR;
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}
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if (mIsBaseSet && mBaseVal == aValueInSpecifiedUnits &&
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mSpecifiedUnitType == uint8_t(aUnitType)) {
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return NS_OK;
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}
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AutoChangeLengthNotifier notifier(this, aSVGElement);
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mBaseVal = aValueInSpecifiedUnits;
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mIsBaseSet = true;
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mSpecifiedUnitType = uint8_t(aUnitType);
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if (!mIsAnimated) {
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mAnimVal = mBaseVal;
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}
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return NS_OK;
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}
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already_AddRefed<DOMSVGLength> SVGAnimatedLength::ToDOMBaseVal(
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SVGElement* aSVGElement) {
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return DOMSVGLength::GetTearOff(this, aSVGElement, false);
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}
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already_AddRefed<DOMSVGLength> SVGAnimatedLength::ToDOMAnimVal(
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SVGElement* aSVGElement) {
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return DOMSVGLength::GetTearOff(this, aSVGElement, true);
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}
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/* Implementation */
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nsresult SVGAnimatedLength::SetBaseValueString(const nsAString& aValueAsString,
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SVGElement* aSVGElement,
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bool aDoSetAttr) {
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float value;
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uint16_t unitType;
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if (!GetValueFromString(aValueAsString, value, &unitType)) {
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return NS_ERROR_DOM_SYNTAX_ERR;
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}
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if (mIsBaseSet && mBaseVal == float(value) &&
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mSpecifiedUnitType == uint8_t(unitType)) {
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return NS_OK;
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}
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AutoChangeLengthNotifier notifier(this, aSVGElement, aDoSetAttr);
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mBaseVal = value;
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mIsBaseSet = true;
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mSpecifiedUnitType = uint8_t(unitType);
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if (!mIsAnimated) {
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mAnimVal = mBaseVal;
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}
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return NS_OK;
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}
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void SVGAnimatedLength::GetBaseValueString(nsAString& aValueAsString) const {
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GetValueString(aValueAsString, mBaseVal, mSpecifiedUnitType);
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}
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void SVGAnimatedLength::GetAnimValueString(nsAString& aValueAsString) const {
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GetValueString(aValueAsString, mAnimVal, mSpecifiedUnitType);
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}
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nsresult SVGAnimatedLength::SetBaseValue(float aValue, SVGElement* aSVGElement,
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bool aDoSetAttr) {
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float pixelsPerUnit = GetPixelsPerUnit(aSVGElement, mSpecifiedUnitType);
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if (pixelsPerUnit == 0.0f) {
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return NS_ERROR_ILLEGAL_VALUE;
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}
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float valueInSpecifiedUnits = aValue / pixelsPerUnit;
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if (!std::isfinite(valueInSpecifiedUnits)) {
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return NS_ERROR_ILLEGAL_VALUE;
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}
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SetBaseValueInSpecifiedUnits(valueInSpecifiedUnits, aSVGElement, aDoSetAttr);
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return NS_OK;
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}
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void SVGAnimatedLength::SetAnimValueInSpecifiedUnits(float aValue,
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SVGElement* aSVGElement) {
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if (mAnimVal == aValue && mIsAnimated) {
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return;
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}
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mAnimVal = aValue;
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mIsAnimated = true;
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aSVGElement->DidAnimateLength(mAttrEnum);
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}
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nsresult SVGAnimatedLength::SetAnimValue(float aValue,
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SVGElement* aSVGElement) {
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float valueInSpecifiedUnits =
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aValue / GetPixelsPerUnit(aSVGElement, mSpecifiedUnitType);
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if (std::isfinite(valueInSpecifiedUnits)) {
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SetAnimValueInSpecifiedUnits(valueInSpecifiedUnits, aSVGElement);
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return NS_OK;
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}
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return NS_ERROR_ILLEGAL_VALUE;
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}
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already_AddRefed<DOMSVGAnimatedLength> SVGAnimatedLength::ToDOMAnimatedLength(
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SVGElement* aSVGElement) {
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RefPtr<DOMSVGAnimatedLength> svgAnimatedLength =
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sSVGAnimatedLengthTearoffTable.GetTearoff(this);
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if (!svgAnimatedLength) {
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svgAnimatedLength = new DOMSVGAnimatedLength(this, aSVGElement);
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sSVGAnimatedLengthTearoffTable.AddTearoff(this, svgAnimatedLength);
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}
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return svgAnimatedLength.forget();
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}
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DOMSVGAnimatedLength::~DOMSVGAnimatedLength() {
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sSVGAnimatedLengthTearoffTable.RemoveTearoff(mVal);
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}
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UniquePtr<SMILAttr> SVGAnimatedLength::ToSMILAttr(SVGElement* aSVGElement) {
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return MakeUnique<SMILLength>(this, aSVGElement);
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}
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nsresult SVGAnimatedLength::SMILLength::ValueFromString(
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const nsAString& aStr, const SVGAnimationElement* /*aSrcElement*/,
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SMILValue& aValue, bool& aPreventCachingOfSandwich) const {
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float value;
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uint16_t unitType;
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if (!GetValueFromString(aStr, value, &unitType)) {
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return NS_ERROR_DOM_SYNTAX_ERR;
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}
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SMILValue val(SMILFloatType::Singleton());
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val.mU.mDouble = value * mVal->GetPixelsPerUnit(mSVGElement, unitType);
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aValue = val;
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aPreventCachingOfSandwich = !SVGLength::IsAbsoluteUnit(unitType);
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return NS_OK;
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}
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SMILValue SVGAnimatedLength::SMILLength::GetBaseValue() const {
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SMILValue val(SMILFloatType::Singleton());
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val.mU.mDouble = mVal->GetBaseValue(mSVGElement);
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return val;
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}
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void SVGAnimatedLength::SMILLength::ClearAnimValue() {
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if (mVal->mIsAnimated) {
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mVal->mIsAnimated = false;
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mVal->mAnimVal = mVal->mBaseVal;
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mSVGElement->DidAnimateLength(mVal->mAttrEnum);
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}
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}
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nsresult SVGAnimatedLength::SMILLength::SetAnimValue(const SMILValue& aValue) {
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NS_ASSERTION(aValue.mType == SMILFloatType::Singleton(),
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"Unexpected type to assign animated value");
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if (aValue.mType == SMILFloatType::Singleton()) {
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return mVal->SetAnimValue(float(aValue.mU.mDouble), mSVGElement);
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}
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return NS_OK;
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}
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} // namespace mozilla
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