The Tor Browser: comparison layout/style/nsStyleAnimation.cpp

--1:000000000000
+:2dd126856d5f
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+/* Utilities for animation of computed style values */
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/MathAlgorithms.h"
+#include "nsStyleAnimation.h"
+#include "nsStyleTransformMatrix.h"
+#include "nsCOMArray.h"
+#include "nsIStyleRule.h"
+#include "mozilla/css/StyleRule.h"
+#include "nsString.h"
+#include "nsStyleContext.h"
+#include "nsStyleSet.h"
+#include "nsComputedDOMStyle.h"
+#include "nsCSSParser.h"
+#include "mozilla/css/Declaration.h"
+#include "mozilla/dom/Element.h"
+#include "mozilla/FloatingPoint.h"
+#include "mozilla/Likely.h"
+#include "gfxMatrix.h"
+#include "gfxQuaternion.h"
+#include "nsIDocument.h"
+using namespace mozilla;
+// HELPER METHODS
+// --------------
+/*
+* Given two units, this method returns a common unit that they can both be
+* converted into, if possible.  This is intended to facilitate
+* interpolation, distance-computation, and addition between "similar" units.
+*
+* The ordering of the arguments should not affect the output of this method.
+*
+* If there's no sensible common unit, this method returns eUnit_Null.
+*
+* @param   aFirstUnit One unit to resolve.
+* @param   aFirstUnit The other unit to resolve.
+* @return  A "common" unit that both source units can be converted into, or
+*          eUnit_Null if that's not possible.
+*/
+static
+nsStyleAnimation::Unit
+GetCommonUnit(nsCSSProperty aProperty,
+nsStyleAnimation::Unit aFirstUnit,
+nsStyleAnimation::Unit aSecondUnit)
+{
+if (aFirstUnit != aSecondUnit) {
+if (nsCSSProps::PropHasFlags(aProperty, CSS_PROPERTY_STORES_CALC) &&
+(aFirstUnit == nsStyleAnimation::eUnit_Coord ||
+aFirstUnit == nsStyleAnimation::eUnit_Percent ||
+aFirstUnit == nsStyleAnimation::eUnit_Calc) &&
+(aSecondUnit == nsStyleAnimation::eUnit_Coord ||
+aSecondUnit == nsStyleAnimation::eUnit_Percent ||
+aSecondUnit == nsStyleAnimation::eUnit_Calc)) {
+// We can use calc() as the common unit.
+return nsStyleAnimation::eUnit_Calc;
+}
+return nsStyleAnimation::eUnit_Null;
+}
+return aFirstUnit;
+}
+static
+nsCSSUnit
+GetCommonUnit(nsCSSProperty aProperty,
+nsCSSUnit aFirstUnit,
+nsCSSUnit aSecondUnit)
+{
+if (aFirstUnit != aSecondUnit) {
+if (nsCSSProps::PropHasFlags(aProperty, CSS_PROPERTY_STORES_CALC) &&
+(aFirstUnit == eCSSUnit_Pixel ||
+aFirstUnit == eCSSUnit_Percent ||
+aFirstUnit == eCSSUnit_Calc) &&
+(aSecondUnit == eCSSUnit_Pixel ||
+aSecondUnit == eCSSUnit_Percent ||
+aSecondUnit == eCSSUnit_Calc)) {
+// We can use calc() as the common unit.
+return eCSSUnit_Calc;
+}
+return eCSSUnit_Null;
+}
+return aFirstUnit;
+}
+static nsCSSKeyword
+ToPrimitive(nsCSSKeyword aKeyword)
+{
+switch (aKeyword) {
+case eCSSKeyword_translatex:
+case eCSSKeyword_translatey:
+case eCSSKeyword_translatez:
+case eCSSKeyword_translate:
+return eCSSKeyword_translate3d;
+case eCSSKeyword_scalex:
+case eCSSKeyword_scaley:
+case eCSSKeyword_scalez:
+case eCSSKeyword_scale:
+return eCSSKeyword_scale3d;
+default:
+return aKeyword;
+}
+}
+static already_AddRefed<nsCSSValue::Array>
+AppendFunction(nsCSSKeyword aTransformFunction)
+{
+uint32_t nargs;
+switch (aTransformFunction) {
+case eCSSKeyword_matrix3d:
+nargs = 16;
+break;
+case eCSSKeyword_matrix:
+nargs = 6;
+break;
+case eCSSKeyword_rotate3d:
+nargs = 4;
+break;
+case eCSSKeyword_interpolatematrix:
+case eCSSKeyword_translate3d:
+case eCSSKeyword_scale3d:
+nargs = 3;
+break;
+case eCSSKeyword_translate:
+case eCSSKeyword_skew:
+case eCSSKeyword_scale:
+nargs = 2;
+break;
+default:
+NS_ERROR("must be a transform function");
+case eCSSKeyword_translatex:
+case eCSSKeyword_translatey:
+case eCSSKeyword_translatez:
+case eCSSKeyword_scalex:
+case eCSSKeyword_scaley:
+case eCSSKeyword_scalez:
+case eCSSKeyword_skewx:
+case eCSSKeyword_skewy:
+case eCSSKeyword_rotate:
+case eCSSKeyword_rotatex:
+case eCSSKeyword_rotatey:
+case eCSSKeyword_rotatez:
+case eCSSKeyword_perspective:
+nargs = 1;
+break;
+}
+nsRefPtr<nsCSSValue::Array> arr = nsCSSValue::Array::Create(nargs + 1);
+arr->Item(0).SetIntValue(aTransformFunction, eCSSUnit_Enumerated);
+return arr.forget();
+}
+static already_AddRefed<nsCSSValue::Array>
+ToPrimitive(nsCSSValue::Array* aArray)
+{
+nsCSSKeyword tfunc = nsStyleTransformMatrix::TransformFunctionOf(aArray);
+nsCSSKeyword primitive = ToPrimitive(tfunc);
+nsRefPtr<nsCSSValue::Array> arr = AppendFunction(primitive);
+// FIXME: This would produce fewer calc() expressions if the
+// zero were of compatible type (length vs. percent) when
+// needed.
+nsCSSValue zero(0.0f, eCSSUnit_Pixel);
+nsCSSValue one(1.0f, eCSSUnit_Number);
+switch(tfunc) {
+case eCSSKeyword_translate:
+{
+NS_ABORT_IF_FALSE(aArray->Count() == 2 || aArray->Count() == 3,
+"unexpected count");
+arr->Item(1) = aArray->Item(1);
+arr->Item(2) = aArray->Count() == 3 ? aArray->Item(2) : zero;
+arr->Item(3) = zero;
+break;
+}
+case eCSSKeyword_translatex:
+{
+NS_ABORT_IF_FALSE(aArray->Count() == 2, "unexpected count");
+arr->Item(1) = aArray->Item(1);
+arr->Item(2) = zero;
+arr->Item(3) = zero;
+break;
+}
+case eCSSKeyword_translatey:
+{
+NS_ABORT_IF_FALSE(aArray->Count() == 2, "unexpected count");
+arr->Item(1) = zero;
+arr->Item(2) = aArray->Item(1);
+arr->Item(3) = zero;
+break;
+}
+case eCSSKeyword_translatez:
+{
+NS_ABORT_IF_FALSE(aArray->Count() == 2, "unexpected count");
+arr->Item(1) = zero;
+arr->Item(2) = zero;
+arr->Item(3) = aArray->Item(1);
+break;
+}
+case eCSSKeyword_scale:
+{
+NS_ABORT_IF_FALSE(aArray->Count() == 2 || aArray->Count() == 3,
+"unexpected count");
+arr->Item(1) = aArray->Item(1);
+arr->Item(2) = aArray->Count() == 3 ? aArray->Item(2) : aArray->Item(1);
+arr->Item(3) = one;
+break;
+}
+case eCSSKeyword_scalex:
+{
+NS_ABORT_IF_FALSE(aArray->Count() == 2, "unexpected count");
+arr->Item(1) = aArray->Item(1);
+arr->Item(2) = one;
+arr->Item(3) = one;
+break;
+}
+case eCSSKeyword_scaley:
+{
+NS_ABORT_IF_FALSE(aArray->Count() == 2, "unexpected count");
+arr->Item(1) = one;
+arr->Item(2) = aArray->Item(1);
+arr->Item(3) = one;
+break;
+}
+case eCSSKeyword_scalez:
+{
+NS_ABORT_IF_FALSE(aArray->Count() == 2, "unexpected count");
+arr->Item(1) = one;
+arr->Item(2) = one;
+arr->Item(3) = aArray->Item(1);
+break;
+}
+default:
+arr = aArray;
+}
+return arr.forget();
+}
+inline void
+nscoordToCSSValue(nscoord aCoord, nsCSSValue& aCSSValue)
+{
+aCSSValue.SetFloatValue(nsPresContext::AppUnitsToFloatCSSPixels(aCoord),
+eCSSUnit_Pixel);
+}
+static void
+AppendCSSShadowValue(const nsCSSShadowItem *aShadow,
+nsCSSValueList **&aResultTail)
+{
+NS_ABORT_IF_FALSE(aShadow, "shadow expected");
+// X, Y, Radius, Spread, Color, Inset
+nsRefPtr<nsCSSValue::Array> arr = nsCSSValue::Array::Create(6);
+nscoordToCSSValue(aShadow->mXOffset, arr->Item(0));
+nscoordToCSSValue(aShadow->mYOffset, arr->Item(1));
+nscoordToCSSValue(aShadow->mRadius, arr->Item(2));
+// NOTE: This code sometimes stores mSpread: 0 even when
+// the parser would be required to leave it null.
+nscoordToCSSValue(aShadow->mSpread, arr->Item(3));
+if (aShadow->mHasColor) {
+arr->Item(4).SetColorValue(aShadow->mColor);
+}
+if (aShadow->mInset) {
+arr->Item(5).SetIntValue(NS_STYLE_BOX_SHADOW_INSET,
+eCSSUnit_Enumerated);
+}
+nsCSSValueList *resultItem = new nsCSSValueList;
+resultItem->mValue.SetArrayValue(arr, eCSSUnit_Array);
+*aResultTail = resultItem;
+aResultTail = &resultItem->mNext;
+}
+// Like nsStyleCoord::Calc, but with length in float pixels instead of nscoord.
+struct CalcValue {
+float mLength, mPercent;
+bool mHasPercent;
+};
+// Requires a canonical calc() value that we generated.
+static CalcValue
+ExtractCalcValueInternal(const nsCSSValue& aValue)
+{
+NS_ABORT_IF_FALSE(aValue.GetUnit() == eCSSUnit_Calc, "unexpected unit");
+nsCSSValue::Array *arr = aValue.GetArrayValue();
+NS_ABORT_IF_FALSE(arr->Count() == 1, "unexpected length");
+const nsCSSValue &topval = arr->Item(0);
+CalcValue result;
+if (topval.GetUnit() == eCSSUnit_Pixel) {
+result.mLength = topval.GetFloatValue();
+result.mPercent = 0.0f;
+result.mHasPercent = false;
+} else {
+NS_ABORT_IF_FALSE(topval.GetUnit() == eCSSUnit_Calc_Plus,
+"unexpected unit");
+nsCSSValue::Array *arr2 = topval.GetArrayValue();
+const nsCSSValue &len = arr2->Item(0);
+const nsCSSValue &pct = arr2->Item(1);
+NS_ABORT_IF_FALSE(len.GetUnit() == eCSSUnit_Pixel, "unexpected unit");
+NS_ABORT_IF_FALSE(pct.GetUnit() == eCSSUnit_Percent, "unexpected unit");
+result.mLength = len.GetFloatValue();
+result.mPercent = pct.GetPercentValue();
+result.mHasPercent = true;
+}
+return result;
+}
+// Requires a canonical calc() value that we generated.
+static CalcValue
+ExtractCalcValue(const nsStyleAnimation::Value& aValue)
+{
+CalcValue result;
+if (aValue.GetUnit() == nsStyleAnimation::eUnit_Coord) {
+result.mLength =
+nsPresContext::AppUnitsToFloatCSSPixels(aValue.GetCoordValue());
+result.mPercent = 0.0f;
+result.mHasPercent = false;
+return result;
+}
+if (aValue.GetUnit() == nsStyleAnimation::eUnit_Percent) {
+result.mLength = 0.0f;
+result.mPercent = aValue.GetPercentValue();
+result.mHasPercent = true;
+return result;
+}
+NS_ABORT_IF_FALSE(aValue.GetUnit() == nsStyleAnimation::eUnit_Calc,
+"unexpected unit");
+nsCSSValue *val = aValue.GetCSSValueValue();
+return ExtractCalcValueInternal(*val);
+}
+static CalcValue
+ExtractCalcValue(const nsCSSValue& aValue)
+{
+CalcValue result;
+if (aValue.GetUnit() == eCSSUnit_Pixel) {
+result.mLength = aValue.GetFloatValue();
+result.mPercent = 0.0f;
+result.mHasPercent = false;
+return result;
+}
+if (aValue.GetUnit() == eCSSUnit_Percent) {
+result.mLength = 0.0f;
+result.mPercent = aValue.GetPercentValue();
+result.mHasPercent = true;
+return result;
+}
+return ExtractCalcValueInternal(aValue);
+}
+static void
+SetCalcValue(const nsStyleCoord::Calc* aCalc, nsCSSValue& aValue)
+{
+nsRefPtr<nsCSSValue::Array> arr = nsCSSValue::Array::Create(1);
+if (!aCalc->mHasPercent) {
+nscoordToCSSValue(aCalc->mLength, arr->Item(0));
+} else {
+nsCSSValue::Array *arr2 = nsCSSValue::Array::Create(2);
+arr->Item(0).SetArrayValue(arr2, eCSSUnit_Calc_Plus);
+nscoordToCSSValue(aCalc->mLength, arr2->Item(0));
+arr2->Item(1).SetPercentValue(aCalc->mPercent);
+}
+aValue.SetArrayValue(arr, eCSSUnit_Calc);
+}
+static void
+SetCalcValue(const CalcValue& aCalc, nsCSSValue& aValue)
+{
+nsRefPtr<nsCSSValue::Array> arr = nsCSSValue::Array::Create(1);
+if (!aCalc.mHasPercent) {
+arr->Item(0).SetFloatValue(aCalc.mLength, eCSSUnit_Pixel);
+} else {
+nsCSSValue::Array *arr2 = nsCSSValue::Array::Create(2);
+arr->Item(0).SetArrayValue(arr2, eCSSUnit_Calc_Plus);
+arr2->Item(0).SetFloatValue(aCalc.mLength, eCSSUnit_Pixel);
+arr2->Item(1).SetPercentValue(aCalc.mPercent);
+}
+aValue.SetArrayValue(arr, eCSSUnit_Calc);
+}
+static already_AddRefed<nsStringBuffer>
+GetURIAsUtf16StringBuffer(nsIURI* aUri)
+{
+nsAutoCString utf8String;
+nsresult rv = aUri->GetSpec(utf8String);
+NS_ENSURE_SUCCESS(rv, nullptr);
+return nsCSSValue::BufferFromString(NS_ConvertUTF8toUTF16(utf8String));
+}
+// CLASS METHODS
+// -------------
+bool
+nsStyleAnimation::ComputeDistance(nsCSSProperty aProperty,
+const Value& aStartValue,
+const Value& aEndValue,
+double& aDistance)
+{
+Unit commonUnit =
+GetCommonUnit(aProperty, aStartValue.GetUnit(), aEndValue.GetUnit());
+switch (commonUnit) {
+case eUnit_Null:
+case eUnit_Auto:
+case eUnit_None:
+case eUnit_Normal:
+case eUnit_UnparsedString:
+return false;
+case eUnit_Enumerated:
+switch (aProperty) {
+case eCSSProperty_font_stretch: {
+// just like eUnit_Integer.
+int32_t startInt = aStartValue.GetIntValue();
+int32_t endInt = aEndValue.GetIntValue();
+aDistance = Abs(endInt - startInt);
+return true;
+}
+default:
+return false;
+}
+case eUnit_Visibility: {
+int32_t startEnum = aStartValue.GetIntValue();
+int32_t endEnum = aEndValue.GetIntValue();
+if (startEnum == endEnum) {
+aDistance = 0;
+return true;
+}
+if ((startEnum == NS_STYLE_VISIBILITY_VISIBLE) ==
+(endEnum == NS_STYLE_VISIBILITY_VISIBLE)) {
+return false;
+}
+aDistance = 1;
+return true;
+}
+case eUnit_Integer: {
+int32_t startInt = aStartValue.GetIntValue();
+int32_t endInt = aEndValue.GetIntValue();
+aDistance = Abs(double(endInt) - double(startInt));
+return true;
+}
+case eUnit_Coord: {
+nscoord startCoord = aStartValue.GetCoordValue();
+nscoord endCoord = aEndValue.GetCoordValue();
+aDistance = Abs(double(endCoord) - double(startCoord));
+return true;
+}
+case eUnit_Percent: {
+float startPct = aStartValue.GetPercentValue();
+float endPct = aEndValue.GetPercentValue();
+aDistance = Abs(double(endPct) - double(startPct));
+return true;
+}
+case eUnit_Float: {
+// Special case for flex-grow and flex-shrink: animations are
+// disallowed between 0 and other values.
+if ((aProperty == eCSSProperty_flex_grow ||
+aProperty == eCSSProperty_flex_shrink) &&
+(aStartValue.GetFloatValue() == 0.0f ||
+aEndValue.GetFloatValue() == 0.0f) &&
+aStartValue.GetFloatValue() != aEndValue.GetFloatValue()) {
+return false;
+}
+float startFloat = aStartValue.GetFloatValue();
+float endFloat = aEndValue.GetFloatValue();
+aDistance = Abs(double(endFloat) - double(startFloat));
+return true;
+}
+case eUnit_Color: {
+// http://www.w3.org/TR/smil-animation/#animateColorElement says
+// that we should use Euclidean RGB cube distance.  However, we
+// have to extend that to RGBA.  For now, we'll just use the
+// Euclidean distance in the (part of the) 4-cube of premultiplied
+// colors.
+// FIXME (spec): The CSS transitions spec doesn't say whether
+// colors are premultiplied, but things work better when they are,
+// so use premultiplication.  Spec issue is still open per
+// http://lists.w3.org/Archives/Public/www-style/2009Jul/0050.html
+nscolor startColor = aStartValue.GetColorValue();
+nscolor endColor = aEndValue.GetColorValue();
+// Get a color component on a 0-1 scale, which is much easier to
+// deal with when working with alpha.
+#define GET_COMPONENT(component_, color_) \
+(NS_GET_##component_(color_) * (1.0 / 255.0))
+double startA = GET_COMPONENT(A, startColor);
+double startR = GET_COMPONENT(R, startColor) * startA;
+double startG = GET_COMPONENT(G, startColor) * startA;
+double startB = GET_COMPONENT(B, startColor) * startA;
+double endA = GET_COMPONENT(A, endColor);
+double endR = GET_COMPONENT(R, endColor) * endA;
+double endG = GET_COMPONENT(G, endColor) * endA;
+double endB = GET_COMPONENT(B, endColor) * endA;
+#undef GET_COMPONENT
+double diffA = startA - endA;
+double diffR = startR - endR;
+double diffG = startG - endG;
+double diffB = startB - endB;
+aDistance = sqrt(diffA * diffA + diffR * diffR +
+diffG * diffG + diffB * diffB);
+return true;
+}
+case eUnit_Calc: {
+CalcValue v1 = ExtractCalcValue(aStartValue);
+CalcValue v2 = ExtractCalcValue(aEndValue);
+float difflen = v2.mLength - v1.mLength;
+float diffpct = v2.mPercent - v1.mPercent;
+aDistance = sqrt(difflen * difflen + diffpct * diffpct);
+return true;
+}
+case eUnit_CSSValuePair: {
+const nsCSSValuePair *pair1 = aStartValue.GetCSSValuePairValue();
+const nsCSSValuePair *pair2 = aEndValue.GetCSSValuePairValue();
+nsCSSUnit unit[2];
+unit[0] = GetCommonUnit(aProperty, pair1->mXValue.GetUnit(),
+pair2->mXValue.GetUnit());
+unit[1] = GetCommonUnit(aProperty, pair1->mYValue.GetUnit(),
+pair2->mYValue.GetUnit());
+if (unit[0] == eCSSUnit_Null || unit[1] == eCSSUnit_Null ||
+unit[0] == eCSSUnit_URL || unit[0] == eCSSUnit_Enumerated) {
+return false;
+}
+double squareDistance = 0.0;
+static nsCSSValue nsCSSValuePair::* const pairValues[2] = {
+&nsCSSValuePair::mXValue, &nsCSSValuePair::mYValue
+};
+for (uint32_t i = 0; i < 2; ++i) {
+nsCSSValue nsCSSValuePair::*member = pairValues[i];
+double diffsquared;
+switch (unit[i]) {
+case eCSSUnit_Pixel: {
+float diff = (pair1->*member).GetFloatValue() -
+(pair2->*member).GetFloatValue();
+diffsquared = diff * diff;
+break;
+}
+case eCSSUnit_Percent: {
+float diff = (pair1->*member).GetPercentValue() -
+(pair2->*member).GetPercentValue();
+diffsquared = diff * diff;
+break;
+}
+case eCSSUnit_Calc: {
+CalcValue v1 = ExtractCalcValue(pair1->*member);
+CalcValue v2 = ExtractCalcValue(pair2->*member);
+float difflen = v2.mLength - v1.mLength;
+float diffpct = v2.mPercent - v1.mPercent;
+diffsquared = difflen * difflen + diffpct * diffpct;
+break;
+}
+default:
+NS_ABORT_IF_FALSE(false, "unexpected unit");
+return false;
+}
+squareDistance += diffsquared;
+}
+aDistance = sqrt(squareDistance);
+return true;
+}
+case eUnit_CSSValueTriplet: {
+const nsCSSValueTriplet *triplet1 = aStartValue.GetCSSValueTripletValue();
+const nsCSSValueTriplet *triplet2 = aEndValue.GetCSSValueTripletValue();
+nsCSSUnit unit[3];
+unit[0] = GetCommonUnit(aProperty, triplet1->mXValue.GetUnit(),
+triplet2->mXValue.GetUnit());
+unit[1] = GetCommonUnit(aProperty, triplet1->mYValue.GetUnit(),
+triplet2->mYValue.GetUnit());
+unit[2] = GetCommonUnit(aProperty, triplet1->mZValue.GetUnit(),
+triplet2->mZValue.GetUnit());
+if (unit[0] == eCSSUnit_Null || unit[1] == eCSSUnit_Null ||
+unit[2] == eCSSUnit_Null) {
+return false;
+}
+double squareDistance = 0.0;
+static nsCSSValue nsCSSValueTriplet::* const pairValues[3] = {
+&nsCSSValueTriplet::mXValue, &nsCSSValueTriplet::mYValue, &nsCSSValueTriplet::mZValue
+};
+for (uint32_t i = 0; i < 3; ++i) {
+nsCSSValue nsCSSValueTriplet::*member = pairValues[i];
+double diffsquared;
+switch (unit[i]) {
+case eCSSUnit_Pixel: {
+float diff = (triplet1->*member).GetFloatValue() -
+(triplet2->*member).GetFloatValue();
+diffsquared = diff * diff;
+break;
+}
+case eCSSUnit_Percent: {
+float diff = (triplet1->*member).GetPercentValue() -
+(triplet2->*member).GetPercentValue();
+diffsquared = diff * diff;
+break;
+}
+case eCSSUnit_Calc: {
+CalcValue v1 = ExtractCalcValue(triplet1->*member);
+CalcValue v2 = ExtractCalcValue(triplet2->*member);
+float difflen = v2.mLength - v1.mLength;
+float diffpct = v2.mPercent - v1.mPercent;
+diffsquared = difflen * difflen + diffpct * diffpct;
+break;
+}
+case eCSSUnit_Null:
+diffsquared = 0;
+break;
+default:
+NS_ABORT_IF_FALSE(false, "unexpected unit");
+return false;
+}
+squareDistance += diffsquared;
+}
+aDistance = sqrt(squareDistance);
+return true;
+}
+case eUnit_CSSRect: {
+const nsCSSRect *rect1 = aStartValue.GetCSSRectValue();
+const nsCSSRect *rect2 = aEndValue.GetCSSRectValue();
+if (rect1->mTop.GetUnit() != rect2->mTop.GetUnit() ||
+rect1->mRight.GetUnit() != rect2->mRight.GetUnit() ||
+rect1->mBottom.GetUnit() != rect2->mBottom.GetUnit() ||
+rect1->mLeft.GetUnit() != rect2->mLeft.GetUnit()) {
+// At least until we have calc()
+return false;
+}
+double squareDistance = 0.0;
+for (uint32_t i = 0; i < ArrayLength(nsCSSRect::sides); ++i) {
+nsCSSValue nsCSSRect::*member = nsCSSRect::sides[i];
+NS_ABORT_IF_FALSE((rect1->*member).GetUnit() ==
+(rect2->*member).GetUnit(),
+"should have returned above");
+double diff;
+switch ((rect1->*member).GetUnit()) {
+case eCSSUnit_Pixel:
+diff = (rect1->*member).GetFloatValue() -
+(rect2->*member).GetFloatValue();
+break;
+case eCSSUnit_Auto:
+diff = 0;
+break;
+default:
+NS_ABORT_IF_FALSE(false, "unexpected unit");
+return false;
+}
+squareDistance += diff * diff;
+}
+aDistance = sqrt(squareDistance);
+return true;
+}
+case eUnit_Dasharray: {
+// NOTE: This produces results on substantially different scales
+// for length values and percentage values, which might even be
+// mixed in the same property value.  This means the result isn't
+// particularly useful for paced animation.
+// Call AddWeighted to make us lists of the same length.
+Value normValue1, normValue2;
+if (!AddWeighted(aProperty, 1.0, aStartValue, 0.0, aEndValue,
+normValue1) ||
+!AddWeighted(aProperty, 0.0, aStartValue, 1.0, aEndValue,
+normValue2)) {
+return false;
+}
+double squareDistance = 0.0;
+const nsCSSValueList *list1 = normValue1.GetCSSValueListValue();
+const nsCSSValueList *list2 = normValue2.GetCSSValueListValue();
+NS_ABORT_IF_FALSE(!list1 == !list2, "lists should be same length");
+while (list1) {
+const nsCSSValue &val1 = list1->mValue;
+const nsCSSValue &val2 = list2->mValue;
+NS_ABORT_IF_FALSE(val1.GetUnit() == val2.GetUnit(),
+"unit match should be assured by AddWeighted");
+double diff;
+switch (val1.GetUnit()) {
+case eCSSUnit_Percent:
+diff = val1.GetPercentValue() - val2.GetPercentValue();
+break;
+case eCSSUnit_Number:
+diff = val1.GetFloatValue() - val2.GetFloatValue();
+break;
+default:
+NS_ABORT_IF_FALSE(false, "unexpected unit");
+return false;
+}
+squareDistance += diff * diff;
+list1 = list1->mNext;
+list2 = list2->mNext;
+NS_ABORT_IF_FALSE(!list1 == !list2, "lists should be same length");
+}
+aDistance = sqrt(squareDistance);
+return true;
+}
+case eUnit_Shadow: {
+// Call AddWeighted to make us lists of the same length.
+Value normValue1, normValue2;
+if (!AddWeighted(aProperty, 1.0, aStartValue, 0.0, aEndValue,
+normValue1) ||
+!AddWeighted(aProperty, 0.0, aStartValue, 1.0, aEndValue,
+normValue2)) {
+return false;
+}
+const nsCSSValueList *shadow1 = normValue1.GetCSSValueListValue();
+const nsCSSValueList *shadow2 = normValue2.GetCSSValueListValue();
+double squareDistance = 0.0;
+NS_ABORT_IF_FALSE(!shadow1 == !shadow2, "lists should be same length");
+while (shadow1) {
+nsCSSValue::Array *array1 = shadow1->mValue.GetArrayValue();
+nsCSSValue::Array *array2 = shadow2->mValue.GetArrayValue();
+for (size_t i = 0; i < 4; ++i) {
+NS_ABORT_IF_FALSE(array1->Item(i).GetUnit() == eCSSUnit_Pixel,
+"unexpected unit");
+NS_ABORT_IF_FALSE(array2->Item(i).GetUnit() == eCSSUnit_Pixel,
+"unexpected unit");
+double diff = array1->Item(i).GetFloatValue() -
+array2->Item(i).GetFloatValue();
+squareDistance += diff * diff;
+}
+const nsCSSValue &color1 = array1->Item(4);
+const nsCSSValue &color2 = array2->Item(4);
+#ifdef DEBUG
+{
+const nsCSSValue &inset1 = array1->Item(5);
+const nsCSSValue &inset2 = array2->Item(5);
+// There are only two possible states of the inset value:
+//  (1) GetUnit() == eCSSUnit_Null
+//  (2) GetUnit() == eCSSUnit_Enumerated &&
+//      GetIntValue() == NS_STYLE_BOX_SHADOW_INSET
+NS_ABORT_IF_FALSE(((color1.IsNumericColorUnit() &&
+color2.IsNumericColorUnit()) ||
+(color1.GetUnit() == color2.GetUnit())) &&
+inset1 == inset2,
+"AddWeighted should have failed");
+}
+#endif
+if (color1.GetUnit() != eCSSUnit_Null) {
+nsStyleAnimation::Value color1Value
+(color1.GetColorValue(), nsStyleAnimation::Value::ColorConstructor);
+nsStyleAnimation::Value color2Value
+(color2.GetColorValue(), nsStyleAnimation::Value::ColorConstructor);
+double colorDistance;
+#ifdef DEBUG
+bool ok =
+#endif
+nsStyleAnimation::ComputeDistance(eCSSProperty_color,
+color1Value, color2Value,
+colorDistance);
+NS_ABORT_IF_FALSE(ok, "should not fail");
+squareDistance += colorDistance * colorDistance;
+}
+shadow1 = shadow1->mNext;
+shadow2 = shadow2->mNext;
+NS_ABORT_IF_FALSE(!shadow1 == !shadow2, "lists should be same length");
+}
+aDistance = sqrt(squareDistance);
+return true;
+}
+case eUnit_Filter:
+// FIXME: Support paced animations for filter function interpolation.
+case eUnit_Transform: {
+return false;
+}
+case eUnit_BackgroundPosition: {
+const nsCSSValueList *position1 = aStartValue.GetCSSValueListValue();
+const nsCSSValueList *position2 = aEndValue.GetCSSValueListValue();
+double squareDistance = 0.0;
+NS_ABORT_IF_FALSE(!position1 == !position2, "lists should be same length");
+while (position1 && position2) {
+NS_ASSERTION(position1->mValue.GetUnit() == eCSSUnit_Array &&
+position2->mValue.GetUnit() == eCSSUnit_Array,
+"Expected two arrays");
+CalcValue calcVal[4];
+nsCSSValue::Array* bgArray = position1->mValue.GetArrayValue();
+NS_ABORT_IF_FALSE(bgArray->Count() == 4, "Invalid background-position");
+NS_ASSERTION(bgArray->Item(0).GetUnit() == eCSSUnit_Null &&
+bgArray->Item(2).GetUnit() == eCSSUnit_Null,
+"Invalid list used");
+for (int i = 0; i < 2; ++i) {
+NS_ABORT_IF_FALSE(bgArray->Item(i*2+1).GetUnit() != eCSSUnit_Null,
+"Invalid background-position");
+calcVal[i] = ExtractCalcValue(bgArray->Item(i*2+1));
+}
+bgArray = position2->mValue.GetArrayValue();
+NS_ABORT_IF_FALSE(bgArray->Count() == 4, "Invalid background-position");
+NS_ASSERTION(bgArray->Item(0).GetUnit() == eCSSUnit_Null &&
+bgArray->Item(2).GetUnit() == eCSSUnit_Null,
+"Invalid list used");
+for (int i = 0; i < 2; ++i) {
+NS_ABORT_IF_FALSE(bgArray->Item(i*2+1).GetUnit() != eCSSUnit_Null,
+"Invalid background-position");
+calcVal[i+2] = ExtractCalcValue(bgArray->Item(i*2+1));
+}
+for (int i = 0; i < 2; ++i) {
+float difflen = calcVal[i+2].mLength - calcVal[i].mLength;
+float diffpct = calcVal[i+2].mPercent - calcVal[i].mPercent;
+squareDistance += difflen * difflen + diffpct * diffpct;
+}
+position1 = position1->mNext;
+position2 = position2->mNext;
+}
+// fail if lists differ in length.
+if (position1 || position2) {
+return false;
+}
+aDistance = sqrt(squareDistance);
+return true;
+}
+case eUnit_CSSValuePairList: {
+const nsCSSValuePairList *list1 = aStartValue.GetCSSValuePairListValue();
+const nsCSSValuePairList *list2 = aEndValue.GetCSSValuePairListValue();
+double squareDistance = 0.0;
+do {
+static nsCSSValue nsCSSValuePairList::* const pairListValues[] = {
+&nsCSSValuePairList::mXValue,
+&nsCSSValuePairList::mYValue,
+};
+for (uint32_t i = 0; i < ArrayLength(pairListValues); ++i) {
+const nsCSSValue &v1 = list1->*(pairListValues[i]);
+const nsCSSValue &v2 = list2->*(pairListValues[i]);
+nsCSSUnit unit =
+GetCommonUnit(aProperty, v1.GetUnit(), v2.GetUnit());
+if (unit == eCSSUnit_Null) {
+return false;
+}
+double diffsquared = 0.0;
+switch (unit) {
+case eCSSUnit_Pixel: {
+float diff = v1.GetFloatValue() - v2.GetFloatValue();
+diffsquared = diff * diff;
+break;
+}
+case eCSSUnit_Percent: {
+float diff = v1.GetPercentValue() - v2.GetPercentValue();
+diffsquared = diff * diff;
+break;
+}
+case eCSSUnit_Calc: {
+CalcValue val1 = ExtractCalcValue(v1);
+CalcValue val2 = ExtractCalcValue(v2);
+float difflen = val2.mLength - val1.mLength;
+float diffpct = val2.mPercent - val1.mPercent;
+diffsquared = difflen * difflen + diffpct * diffpct;
+break;
+}
+default:
+if (v1 != v2) {
+return false;
+}
+break;
+}
+squareDistance += diffsquared;
+}
+list1 = list1->mNext;
+list2 = list2->mNext;
+} while (list1 && list2);
+if (list1 || list2) {
+// We can't interpolate lists of different lengths.
+return false;
+}
+aDistance = sqrt(squareDistance);
+return true;
+}
+}
+NS_ABORT_IF_FALSE(false, "Can't compute distance using the given common unit");
+return false;
+}
+#define MAX_PACKED_COLOR_COMPONENT 255
+inline uint8_t ClampColor(double aColor)
+{
+if (aColor >= MAX_PACKED_COLOR_COMPONENT)
+return MAX_PACKED_COLOR_COMPONENT;
+if (aColor <= 0.0)
+return 0;
+return NSToIntRound(aColor);
+}
+// Ensure that a float/double value isn't NaN by returning zero instead
+// (NaN doesn't have a sign) as a general restriction for floating point
+// values in RestrictValue.
+template<typename T>
+MOZ_ALWAYS_INLINE T
+EnsureNotNan(T aValue)
+{
+return aValue;
+}
+template<>
+MOZ_ALWAYS_INLINE float
+EnsureNotNan(float aValue)
+{
+// This would benefit from a MOZ_FLOAT_IS_NaN if we had one.
+return MOZ_LIKELY(!mozilla::IsNaN(aValue)) ? aValue : 0;
+}
+template<>
+MOZ_ALWAYS_INLINE double
+EnsureNotNan(double aValue)
+{
+return MOZ_LIKELY(!mozilla::IsNaN(aValue)) ? aValue : 0;
+}
+template <typename T>
+T
+RestrictValue(uint32_t aRestrictions, T aValue)
+{
+T result = EnsureNotNan(aValue);
+switch (aRestrictions) {
+case 0:
+break;
+case CSS_PROPERTY_VALUE_NONNEGATIVE:
+if (result < 0) {
+result = 0;
+}
+break;
+case CSS_PROPERTY_VALUE_AT_LEAST_ONE:
+if (result < 1) {
+result = 1;
+}
+break;
+default:
+NS_ABORT_IF_FALSE(false, "bad value restriction");
+break;
+}
+return result;
+}
+template <typename T>
+T
+RestrictValue(nsCSSProperty aProperty, T aValue)
+{
+return RestrictValue(nsCSSProps::ValueRestrictions(aProperty), aValue);
+}
+static inline void
+AddCSSValuePixel(double aCoeff1, const nsCSSValue &aValue1,
+double aCoeff2, const nsCSSValue &aValue2,
+nsCSSValue &aResult, uint32_t aValueRestrictions = 0)
+{
+NS_ABORT_IF_FALSE(aValue1.GetUnit() == eCSSUnit_Pixel, "unexpected unit");
+NS_ABORT_IF_FALSE(aValue2.GetUnit() == eCSSUnit_Pixel, "unexpected unit");
+aResult.SetFloatValue(RestrictValue(aValueRestrictions,
+aCoeff1 * aValue1.GetFloatValue() +
+aCoeff2 * aValue2.GetFloatValue()),
+eCSSUnit_Pixel);
+}
+static inline void
+AddCSSValueNumber(double aCoeff1, const nsCSSValue &aValue1,
+double aCoeff2, const nsCSSValue &aValue2,
+nsCSSValue &aResult, uint32_t aValueRestrictions = 0)
+{
+NS_ABORT_IF_FALSE(aValue1.GetUnit() == eCSSUnit_Number, "unexpected unit");
+NS_ABORT_IF_FALSE(aValue2.GetUnit() == eCSSUnit_Number, "unexpected unit");
+aResult.SetFloatValue(RestrictValue(aValueRestrictions,
+aCoeff1 * aValue1.GetFloatValue() +
+aCoeff2 * aValue2.GetFloatValue()),
+eCSSUnit_Number);
+}
+static inline void
+AddCSSValuePercent(double aCoeff1, const nsCSSValue &aValue1,
+double aCoeff2, const nsCSSValue &aValue2,
+nsCSSValue &aResult, uint32_t aValueRestrictions = 0)
+{
+NS_ABORT_IF_FALSE(aValue1.GetUnit() == eCSSUnit_Percent, "unexpected unit");
+NS_ABORT_IF_FALSE(aValue2.GetUnit() == eCSSUnit_Percent, "unexpected unit");
+aResult.SetPercentValue(RestrictValue(aValueRestrictions,
+aCoeff1 * aValue1.GetPercentValue() +
+aCoeff2 * aValue2.GetPercentValue()));
+}
+// Add two canonical-form calc values (eUnit_Calc) to make another
+// canonical-form calc value.
+static void
+AddCSSValueCanonicalCalc(double aCoeff1, const nsCSSValue &aValue1,
+double aCoeff2, const nsCSSValue &aValue2,
+nsCSSValue &aResult)
+{
+CalcValue v1 = ExtractCalcValue(aValue1);
+CalcValue v2 = ExtractCalcValue(aValue2);
+CalcValue result;
+result.mLength = aCoeff1 * v1.mLength + aCoeff2 * v2.mLength;
+result.mPercent = aCoeff1 * v1.mPercent + aCoeff2 * v2.mPercent;
+result.mHasPercent = v1.mHasPercent || v2.mHasPercent;
+MOZ_ASSERT(result.mHasPercent || result.mPercent == 0.0f,
+"can't have a nonzero percentage part without having percentages");
+SetCalcValue(result, aResult);
+}
+static void
+AddCSSValueAngle(double aCoeff1, const nsCSSValue &aValue1,
+double aCoeff2, const nsCSSValue &aValue2,
+nsCSSValue &aResult)
+{
+aResult.SetFloatValue(aCoeff1 * aValue1.GetAngleValueInRadians() +
+aCoeff2 * aValue2.GetAngleValueInRadians(),
+eCSSUnit_Radian);
+}
+static bool
+AddCSSValuePixelPercentCalc(const uint32_t aValueRestrictions,
+const nsCSSUnit aCommonUnit,
+double aCoeff1, const nsCSSValue &aValue1,
+double aCoeff2, const nsCSSValue &aValue2,
+nsCSSValue &aResult)
+{
+switch (aCommonUnit) {
+case eCSSUnit_Pixel:
+AddCSSValuePixel(aCoeff1, aValue1,
+aCoeff2, aValue2,
+aResult, aValueRestrictions);
+break;
+case eCSSUnit_Percent:
+AddCSSValuePercent(aCoeff1, aValue1,
+aCoeff2, aValue2,
+aResult, aValueRestrictions);
+break;
+case eCSSUnit_Calc:
+AddCSSValueCanonicalCalc(aCoeff1, aValue1,
+aCoeff2, aValue2,
+aResult);
+break;
+default:
+return false;
+}
+return true;
+}
+static inline float
+GetNumberOrPercent(const nsCSSValue &aValue)
+{
+nsCSSUnit unit = aValue.GetUnit();
+NS_ABORT_IF_FALSE(unit == eCSSUnit_Number || unit == eCSSUnit_Percent,
+"unexpected unit");
+return (unit == eCSSUnit_Number) ?
+aValue.GetFloatValue() : aValue.GetPercentValue();
+}
+static inline void
+AddCSSValuePercentNumber(const uint32_t aValueRestrictions,
+double aCoeff1, const nsCSSValue &aValue1,
+double aCoeff2, const nsCSSValue &aValue2,
+nsCSSValue &aResult, float aInitialVal)
+{
+float n1 = GetNumberOrPercent(aValue1);
+float n2 = GetNumberOrPercent(aValue2);
+// Rather than interpolating aValue1 and aValue2 directly, we
+// interpolate their *distances from aInitialVal* (the initial value,
+// which is either 1 or 0 for "filter" functions).  This matters in
+// cases where aInitialVal is nonzero and the coefficients don't add
+// up to 1.  For example, if initialVal is 1, aCoeff1 is 0.5, and
+// aCoeff2 is 0, then we'll return the value halfway between 1 and
+// aValue1, rather than the value halfway between 0 and aValue1.
+// Note that we do something similar in AddTransformScale().
+float result = (n1 - aInitialVal) * aCoeff1 + (n2 - aInitialVal) * aCoeff2;
+aResult.SetFloatValue(RestrictValue(aValueRestrictions, result + aInitialVal),
+eCSSUnit_Number);
+}
+static bool
+AddShadowItems(double aCoeff1, const nsCSSValue &aValue1,
+double aCoeff2, const nsCSSValue &aValue2,
+nsCSSValueList **&aResultTail)
+{
+// X, Y, Radius, Spread, Color, Inset
+NS_ABORT_IF_FALSE(aValue1.GetUnit() == eCSSUnit_Array,
+"wrong unit");
+NS_ABORT_IF_FALSE(aValue2.GetUnit() == eCSSUnit_Array,
+"wrong unit");
+nsCSSValue::Array *array1 = aValue1.GetArrayValue();
+nsCSSValue::Array *array2 = aValue2.GetArrayValue();
+nsRefPtr<nsCSSValue::Array> resultArray = nsCSSValue::Array::Create(6);
+for (size_t i = 0; i < 4; ++i) {
+AddCSSValuePixel(aCoeff1, array1->Item(i), aCoeff2, array2->Item(i),
+resultArray->Item(i),
+// blur radius must be nonnegative
+(i == 2) ? CSS_PROPERTY_VALUE_NONNEGATIVE : 0);
+}
+const nsCSSValue& color1 = array1->Item(4);
+const nsCSSValue& color2 = array2->Item(4);
+const nsCSSValue& inset1 = array1->Item(5);
+const nsCSSValue& inset2 = array2->Item(5);
+if (color1.GetUnit() != color2.GetUnit() ||
+inset1.GetUnit() != inset2.GetUnit()) {
+// We don't know how to animate between color and no-color, or
+// between inset and not-inset.
+return false;
+}
+if (color1.GetUnit() != eCSSUnit_Null) {
+nsStyleAnimation::Value color1Value
+(color1.GetColorValue(), nsStyleAnimation::Value::ColorConstructor);
+nsStyleAnimation::Value color2Value
+(color2.GetColorValue(), nsStyleAnimation::Value::ColorConstructor);
+nsStyleAnimation::Value resultColorValue;
+#ifdef DEBUG
+bool ok =
+#endif
+nsStyleAnimation::AddWeighted(eCSSProperty_color, aCoeff1, color1Value,
+aCoeff2, color2Value, resultColorValue);
+NS_ABORT_IF_FALSE(ok, "should not fail");
+resultArray->Item(4).SetColorValue(resultColorValue.GetColorValue());
+}
+NS_ABORT_IF_FALSE(inset1 == inset2, "should match");
+resultArray->Item(5) = inset1;
+nsCSSValueList *resultItem = new nsCSSValueList;
+if (!resultItem) {
+return false;
+}
+resultItem->mValue.SetArrayValue(resultArray, eCSSUnit_Array);
+*aResultTail = resultItem;
+aResultTail = &resultItem->mNext;
+return true;
+}
+static void
+AddTransformTranslate(double aCoeff1, const nsCSSValue &aValue1,
+double aCoeff2, const nsCSSValue &aValue2,
+nsCSSValue &aResult)
+{
+NS_ABORT_IF_FALSE(aValue1.GetUnit() == eCSSUnit_Percent ||
+aValue1.GetUnit() == eCSSUnit_Pixel ||
+aValue1.IsCalcUnit(),
+"unexpected unit");
+NS_ABORT_IF_FALSE(aValue2.GetUnit() == eCSSUnit_Percent ||
+aValue2.GetUnit() == eCSSUnit_Pixel ||
+aValue2.IsCalcUnit(),
+"unexpected unit");
+if (aValue1.GetUnit() != aValue2.GetUnit() || aValue1.IsCalcUnit()) {
+// different units; create a calc() expression
+AddCSSValueCanonicalCalc(aCoeff1, aValue1, aCoeff2, aValue2, aResult);
+} else if (aValue1.GetUnit() == eCSSUnit_Percent) {
+// both percent
+AddCSSValuePercent(aCoeff1, aValue1, aCoeff2, aValue2, aResult);
+} else {
+// both pixels
+AddCSSValuePixel(aCoeff1, aValue1, aCoeff2, aValue2, aResult);
+}
+}
+static void
+AddTransformScale(double aCoeff1, const nsCSSValue &aValue1,
+double aCoeff2, const nsCSSValue &aValue2,
+nsCSSValue &aResult)
+{
+// Handle scale, and the two matrix components where identity is 1, by
+// subtracting 1, multiplying by the coefficients, and then adding 1
+// back.  This gets the right AddWeighted behavior and gets us the
+// interpolation-against-identity behavior for free.
+NS_ABORT_IF_FALSE(aValue1.GetUnit() == eCSSUnit_Number, "unexpected unit");
+NS_ABORT_IF_FALSE(aValue2.GetUnit() == eCSSUnit_Number, "unexpected unit");
+float v1 = aValue1.GetFloatValue() - 1.0f,
+v2 = aValue2.GetFloatValue() - 1.0f;
+float result = v1 * aCoeff1 + v2 * aCoeff2;
+aResult.SetFloatValue(result + 1.0f, eCSSUnit_Number);
+}
+/* static */ already_AddRefed<nsCSSValue::Array>
+nsStyleAnimation::AppendTransformFunction(nsCSSKeyword aTransformFunction,
+nsCSSValueList**& aListTail)
+{
+nsRefPtr<nsCSSValue::Array> arr = AppendFunction(aTransformFunction);
+nsCSSValueList *item = new nsCSSValueList;
+item->mValue.SetArrayValue(arr, eCSSUnit_Function);
+*aListTail = item;
+aListTail = &item->mNext;
+return arr.forget();
+}
+/*
+* The relevant section of the transitions specification:
+* http://dev.w3.org/csswg/css3-transitions/#animation-of-property-types-
+* defers all of the details to the 2-D and 3-D transforms specifications.
+* For the 2-D transforms specification (all that's relevant for us, right
+* now), the relevant section is:
+* http://dev.w3.org/csswg/css3-2d-transforms/#animation
+* This, in turn, refers to the unmatrix program in Graphics Gems,
+* available from http://tog.acm.org/resources/GraphicsGems/ , and in
+* particular as the file GraphicsGems/gemsii/unmatrix.c
+* in http://tog.acm.org/resources/GraphicsGems/AllGems.tar.gz
+*
+* The unmatrix reference is for general 3-D transform matrices (any of the
+* 16 components can have any value).
+*
+* For CSS 2-D transforms, we have a 2-D matrix with the bottom row constant:
+*
+* [ A C E ]
+* [ B D F ]
+* [ 0 0 1 ]
+*
+* For that case, I believe the algorithm in unmatrix reduces to:
+*
+*  (1) If A * D - B * C == 0, the matrix is singular.  Fail.
+*
+*  (2) Set translation components (Tx and Ty) to the translation parts of
+*      the matrix (E and F) and then ignore them for the rest of the time.
+*      (For us, E and F each actually consist of three constants:  a
+*      length, a multiplier for the width, and a multiplier for the
+*      height.  This actually requires its own decomposition, but I'll
+*      keep that separate.)
+*
+*  (3) Let the X scale (Sx) be sqrt(A^2 + B^2).  Then divide both A and B
+*      by it.
+*
+*  (4) Let the XY shear (K) be A * C + B * D.  From C, subtract A times
+*      the XY shear.  From D, subtract B times the XY shear.
+*
+*  (5) Let the Y scale (Sy) be sqrt(C^2 + D^2).  Divide C, D, and the XY
+*      shear (K) by it.
+*
+*  (6) At this point, A * D - B * C is either 1 or -1.  If it is -1,
+*      negate the XY shear (K), the X scale (Sx), and A, B, C, and D.
+*      (Alternatively, we could negate the XY shear (K) and the Y scale
+*      (Sy).)
+*
+*  (7) Let the rotation be R = atan2(B, A).
+*
+* Then the resulting decomposed transformation is:
+*
+*   translate(Tx, Ty) rotate(R) skewX(atan(K)) scale(Sx, Sy)
+*
+* An interesting result of this is that all of the simple transform
+* functions (i.e., all functions other than matrix()), in isolation,
+* decompose back to themselves except for:
+*   'skewY(φ)', which is 'matrix(1, tan(φ), 0, 1, 0, 0)', which decomposes
+*   to 'rotate(φ) skewX(φ) scale(sec(φ), cos(φ))' since (ignoring the
+*   alternate sign possibilities that would get fixed in step 6):
+*     In step 3, the X scale factor is sqrt(1+tan²(φ)) = sqrt(sec²(φ)) = sec(φ).
+*     Thus, after step 3, A = 1/sec(φ) = cos(φ) and B = tan(φ) / sec(φ) = sin(φ).
+*     In step 4, the XY shear is sin(φ).
+*     Thus, after step 4, C = -cos(φ)sin(φ) and D = 1 - sin²(φ) = cos²(φ).
+*     Thus, in step 5, the Y scale is sqrt(cos²(φ)(sin²(φ) + cos²(φ)) = cos(φ).
+*     Thus, after step 5, C = -sin(φ), D = cos(φ), and the XY shear is tan(φ).
+*     Thus, in step 6, A * D - B * C = cos²(φ) + sin²(φ) = 1.
+*     In step 7, the rotation is thus φ.
+*
+*   skew(θ, φ), which is matrix(1, tan(φ), tan(θ), 1, 0, 0), which decomposes
+*   to 'rotate(φ) skewX(θ + φ) scale(sec(φ), cos(φ))' since (ignoring
+*   the alternate sign possibilities that would get fixed in step 6):
+*     In step 3, the X scale factor is sqrt(1+tan²(φ)) = sqrt(sec²(φ)) = sec(φ).
+*     Thus, after step 3, A = 1/sec(φ) = cos(φ) and B = tan(φ) / sec(φ) = sin(φ).
+*     In step 4, the XY shear is cos(φ)tan(θ) + sin(φ).
+*     Thus, after step 4,
+*     C = tan(θ) - cos(φ)(cos(φ)tan(θ) + sin(φ)) = tan(θ)sin²(φ) - cos(φ)sin(φ)
+*     D = 1 - sin(φ)(cos(φ)tan(θ) + sin(φ)) = cos²(φ) - sin(φ)cos(φ)tan(θ)
+*     Thus, in step 5, the Y scale is sqrt(C² + D²) =
+*     sqrt(tan²(θ)(sin⁴(φ) + sin²(φ)cos²(φ)) -
+*          2 tan(θ)(sin³(φ)cos(φ) + sin(φ)cos³(φ)) +
+*          (sin²(φ)cos²(φ) + cos⁴(φ))) =
+*     sqrt(tan²(θ)sin²(φ) - 2 tan(θ)sin(φ)cos(φ) + cos²(φ)) =
+*     cos(φ) - tan(θ)sin(φ) (taking the negative of the obvious solution so
+*     we avoid flipping in step 6).
+*     After step 5, C = -sin(φ) and D = cos(φ), and the XY shear is
+*     (cos(φ)tan(θ) + sin(φ)) / (cos(φ) - tan(θ)sin(φ)) =
+*     (dividing both numerator and denominator by cos(φ))
+*     (tan(θ) + tan(φ)) / (1 - tan(θ)tan(φ)) = tan(θ + φ).
+*     (See http://en.wikipedia.org/wiki/List_of_trigonometric_identities .)
+*     Thus, in step 6, A * D - B * C = cos²(φ) + sin²(φ) = 1.
+*     In step 7, the rotation is thus φ.
+*
+*     To check this result, we can multiply things back together:
+*
+*     [ cos(φ) -sin(φ) ] [ 1 tan(θ + φ) ] [ sec(φ)    0   ]
+*     [ sin(φ)  cos(φ) ] [ 0      1     ] [   0    cos(φ) ]
+*
+*     [ cos(φ)      cos(φ)tan(θ + φ) - sin(φ) ] [ sec(φ)    0   ]
+*     [ sin(φ)      sin(φ)tan(θ + φ) + cos(φ) ] [   0    cos(φ) ]
+*
+*     but since tan(θ + φ) = (tan(θ) + tan(φ)) / (1 - tan(θ)tan(φ)),
+*     cos(φ)tan(θ + φ) - sin(φ)
+*      = cos(φ)(tan(θ) + tan(φ)) - sin(φ) + sin(φ)tan(θ)tan(φ)
+*      = cos(φ)tan(θ) + sin(φ) - sin(φ) + sin(φ)tan(θ)tan(φ)
+*      = cos(φ)tan(θ) + sin(φ)tan(θ)tan(φ)
+*      = tan(θ) (cos(φ) + sin(φ)tan(φ))
+*      = tan(θ) sec(φ) (cos²(φ) + sin²(φ))
+*      = tan(θ) sec(φ)
+*     and
+*     sin(φ)tan(θ + φ) + cos(φ)
+*      = sin(φ)(tan(θ) + tan(φ)) + cos(φ) - cos(φ)tan(θ)tan(φ)
+*      = tan(θ) (sin(φ) - sin(φ)) + sin(φ)tan(φ) + cos(φ)
+*      = sec(φ) (sin²(φ) + cos²(φ))
+*      = sec(φ)
+*     so the above is:
+*     [ cos(φ)  tan(θ) sec(φ) ] [ sec(φ)    0   ]
+*     [ sin(φ)     sec(φ)     ] [   0    cos(φ) ]
+*
+*     [    1   tan(θ) ]
+*     [ tan(φ)    1   ]
+*/
+/*
+* Decompose2DMatrix implements the above decomposition algorithm.
+*/
+#define XYSHEAR 0
+#define XZSHEAR 1
+#define YZSHEAR 2
+static bool
+Decompose2DMatrix(const gfxMatrix &aMatrix, gfxPoint3D &aScale,
+float aShear[3], gfxQuaternion &aRotate,
+gfxPoint3D &aTranslate)
+{
+float A = aMatrix.xx,
+B = aMatrix.yx,
+C = aMatrix.xy,
+D = aMatrix.yy;
+if (A * D == B * C) {
+// singular matrix
+return false;
+}
+float scaleX = sqrt(A * A + B * B);
+A /= scaleX;
+B /= scaleX;
+float XYshear = A * C + B * D;
+C -= A * XYshear;
+D -= B * XYshear;
+float scaleY = sqrt(C * C + D * D);
+C /= scaleY;
+D /= scaleY;
+XYshear /= scaleY;
+// A*D - B*C should now be 1 or -1
+NS_ASSERTION(0.99 < Abs(A*D - B*C) && Abs(A*D - B*C) < 1.01,
+"determinant should now be 1 or -1");
+if (A * D < B * C) {
+A = -A;
+B = -B;
+C = -C;
+D = -D;
+XYshear = -XYshear;
+scaleX = -scaleX;
+}
+float rotate = atan2f(B, A);
+aRotate = gfxQuaternion(0, 0, sin(rotate/2), cos(rotate/2));
+aShear[XYSHEAR] = XYshear;
+aScale.x = scaleX;
+aScale.y = scaleY;
+aTranslate.x = aMatrix.x0;
+aTranslate.y = aMatrix.y0;
+return true;
+}
+/**
+* Implementation of the unmatrix algorithm, specified by:
+*
+* http://dev.w3.org/csswg/css3-2d-transforms/#unmatrix
+*
+* This, in turn, refers to the unmatrix program in Graphics Gems,
+* available from http://tog.acm.org/resources/GraphicsGems/ , and in
+* particular as the file GraphicsGems/gemsii/unmatrix.c
+* in http://tog.acm.org/resources/GraphicsGems/AllGems.tar.gz
+*/
+static bool
+Decompose3DMatrix(const gfx3DMatrix &aMatrix, gfxPoint3D &aScale,
+float aShear[3], gfxQuaternion &aRotate,
+gfxPoint3D &aTranslate, gfxPointH3D &aPerspective)
+{
+gfx3DMatrix local = aMatrix;
+if (local[3][3] == 0) {
+return false;
+}
+/* Normalize the matrix */
+local.Normalize();
+/**
+* perspective is used to solve for perspective, but it also provides
+* an easy way to test for singularity of the upper 3x3 component.
+*/
+gfx3DMatrix perspective = local;
+gfxPointH3D empty(0, 0, 0, 1);
+perspective.SetTransposedVector(3, empty);
+if (perspective.Determinant() == 0.0) {
+return false;
+}
+/* First, isolate perspective. */
+if (local[0][3] != 0 || local[1][3] != 0 ||
+local[2][3] != 0) {
+/* aPerspective is the right hand side of the equation. */
+aPerspective = local.TransposedVector(3);
+/**
+* Solve the equation by inverting perspective and multiplying
+* aPerspective by the inverse.
+*/
+perspective.Invert();
+aPerspective = perspective.TransposeTransform4D(aPerspective);
+/* Clear the perspective partition */
+local.SetTransposedVector(3, empty);
+} else {
+aPerspective = gfxPointH3D(0, 0, 0, 1);
+}
+/* Next take care of translation */
+for (int i = 0; i < 3; i++) {
+aTranslate[i] = local[3][i];
+local[3][i] = 0;
+}
+/* Now get scale and shear. */
+/* Compute X scale factor and normalize first row. */
+aScale.x = local[0].Length();
+local[0] /= aScale.x;
+/* Compute XY shear factor and make 2nd local orthogonal to 1st. */
+aShear[XYSHEAR] = local[0].DotProduct(local[1]);
+local[1] -= local[0] * aShear[XYSHEAR];
+/* Now, compute Y scale and normalize 2nd local. */
+aScale.y = local[1].Length();
+local[1] /= aScale.y;
+aShear[XYSHEAR] /= aScale.y;
+/* Compute XZ and YZ shears, make 3rd local orthogonal */
+aShear[XZSHEAR] = local[0].DotProduct(local[2]);
+local[2] -= local[0] * aShear[XZSHEAR];
+aShear[YZSHEAR] = local[1].DotProduct(local[2]);
+local[2] -= local[1] * aShear[YZSHEAR];
+/* Next, get Z scale and normalize 3rd local. */
+aScale.z = local[2].Length();
+local[2] /= aScale.z;
+aShear[XZSHEAR] /= aScale.z;
+aShear[YZSHEAR] /= aScale.z;
+/**
+* At this point, the matrix (in locals) is orthonormal.
+* Check for a coordinate system flip.  If the determinant
+* is -1, then negate the matrix and the scaling factors.
+*/
+if (local[0].DotProduct(local[1].CrossProduct(local[2])) < 0) {
+aScale *= -1;
+for (int i = 0; i < 3; i++) {
+local[i] *= -1;
+}
+}
+/* Now, get the rotations out */
+aRotate = gfxQuaternion(local);
+return true;
+}
+template<typename T>
+T InterpolateNumerically(const T& aOne, const T& aTwo, double aCoeff)
+{
+return aOne + (aTwo - aOne) * aCoeff;
+}
+/* static */ gfx3DMatrix
+nsStyleAnimation::InterpolateTransformMatrix(const gfx3DMatrix &aMatrix1,
+const gfx3DMatrix &aMatrix2,
+double aProgress)
+{
+// Decompose both matrices
+// TODO: What do we do if one of these returns false (singular matrix)
+gfxPoint3D scale1(1, 1, 1), translate1;
+gfxPointH3D perspective1(0, 0, 0, 1);
+gfxQuaternion rotate1;
+float shear1[3] = { 0.0f, 0.0f, 0.0f};
+gfxPoint3D scale2(1, 1, 1), translate2;
+gfxPointH3D perspective2(0, 0, 0, 1);
+gfxQuaternion rotate2;
+float shear2[3] = { 0.0f, 0.0f, 0.0f};
+gfxMatrix matrix2d1, matrix2d2;
+if (aMatrix1.Is2D(&matrix2d1) && aMatrix2.Is2D(&matrix2d2)) {
+Decompose2DMatrix(matrix2d1, scale1, shear1, rotate1, translate1);
+Decompose2DMatrix(matrix2d2, scale2, shear2, rotate2, translate2);
+} else {
+Decompose3DMatrix(aMatrix1, scale1, shear1,
+rotate1, translate1, perspective1);
+Decompose3DMatrix(aMatrix2, scale2, shear2,
+rotate2, translate2, perspective2);
+}
+// Interpolate each of the pieces
+gfx3DMatrix result;
+gfxPointH3D perspective =
+InterpolateNumerically(perspective1, perspective2, aProgress);
+result.SetTransposedVector(3, perspective);
+gfxPoint3D translate =
+InterpolateNumerically(translate1, translate2, aProgress);
+result.Translate(translate);
+gfxQuaternion q3 = rotate1.Slerp(rotate2, aProgress);
+gfx3DMatrix rotate = q3.ToMatrix();
+if (!rotate.IsIdentity()) {
+result = rotate * result;
+}
+// TODO: Would it be better to interpolate these as angles? How do we convert back to angles?
+float yzshear =
+InterpolateNumerically(shear1[YZSHEAR], shear2[YZSHEAR], aProgress);
+if (yzshear != 0.0) {
+result.SkewYZ(yzshear);
+}
+float xzshear =
+InterpolateNumerically(shear1[XZSHEAR], shear2[XZSHEAR], aProgress);
+if (xzshear != 0.0) {
+result.SkewXZ(xzshear);
+}
+float xyshear =
+InterpolateNumerically(shear1[XYSHEAR], shear2[XYSHEAR], aProgress);
+if (xyshear != 0.0) {
+result.SkewXY(xyshear);
+}
+gfxPoint3D scale =
+InterpolateNumerically(scale1, scale2, aProgress);
+if (scale != gfxPoint3D(1.0, 1.0, 1.0)) {
+result.Scale(scale.x, scale.y, scale.z);
+}
+return result;
+}
+static nsCSSValueList*
+AddDifferentTransformLists(double aCoeff1, const nsCSSValueList* aList1,
+double aCoeff2, const nsCSSValueList* aList2)
+{
+nsAutoPtr<nsCSSValueList> result;
+nsCSSValueList **resultTail = getter_Transfers(result);
+nsRefPtr<nsCSSValue::Array> arr;
+arr = nsStyleAnimation::AppendTransformFunction(eCSSKeyword_interpolatematrix, resultTail);
+// FIXME: We should change the other transform code to also only
+// take a single progress value, as having values that don't
+// sum to 1 doesn't make sense for these.
+if (aList1 == aList2) {
+arr->Item(1).Reset();
+} else {
+aList1->CloneInto(arr->Item(1).SetListValue());
+}
+aList2->CloneInto(arr->Item(2).SetListValue());
+arr->Item(3).SetPercentValue(aCoeff2);
+return result.forget();
+}
+static bool
+TransformFunctionsMatch(nsCSSKeyword func1, nsCSSKeyword func2)
+{
+return ToPrimitive(func1) == ToPrimitive(func2);
+}
+static bool
+AddFilterFunctionImpl(double aCoeff1, const nsCSSValueList* aList1,
+double aCoeff2, const nsCSSValueList* aList2,
+nsCSSValueList**& aResultTail)
+{
+// AddFilterFunction should be our only caller, and it should ensure that both
+// args are non-null.
+NS_ABORT_IF_FALSE(aList1, "expected filter list");
+NS_ABORT_IF_FALSE(aList2, "expected filter list");
+NS_ABORT_IF_FALSE(aList1->mValue.GetUnit() == eCSSUnit_Function,
+"expected function");
+NS_ABORT_IF_FALSE(aList2->mValue.GetUnit() == eCSSUnit_Function,
+"expected function");
+nsRefPtr<nsCSSValue::Array> a1 = aList1->mValue.GetArrayValue(),
+a2 = aList2->mValue.GetArrayValue();
+nsCSSKeyword filterFunction = a1->Item(0).GetKeywordValue();
+if (filterFunction != a2->Item(0).GetKeywordValue())
+return false; // Can't add two filters of different types.
+nsAutoPtr<nsCSSValueList> resultListEntry(new nsCSSValueList);
+nsCSSValue::Array* result =
+resultListEntry->mValue.InitFunction(filterFunction, 1);
+// "hue-rotate" is the only filter-function that accepts negative values, and
+// we don't use this "restrictions" variable in its clause below.
+const uint32_t restrictions = CSS_PROPERTY_VALUE_NONNEGATIVE;
+const nsCSSValue& funcArg1 = a1->Item(1);
+const nsCSSValue& funcArg2 = a2->Item(1);
+nsCSSValue& resultArg = result->Item(1);
+float initialVal = 1.0f;
+switch (filterFunction) {
+case eCSSKeyword_blur: {
+nsCSSUnit unit;
+if (funcArg1.GetUnit() == funcArg2.GetUnit()) {
+unit = funcArg1.GetUnit();
+} else {
+// If units differ, we'll just combine them with calc().
+unit = eCSSUnit_Calc;
+}
+if (!AddCSSValuePixelPercentCalc(restrictions,
+unit,
+aCoeff1, funcArg1,
+aCoeff2, funcArg2,
+resultArg)) {
+return false;
+}
+break;
+}
+case eCSSKeyword_grayscale:
+case eCSSKeyword_invert:
+case eCSSKeyword_sepia:
+initialVal = 0.0f;
+case eCSSKeyword_brightness:
+case eCSSKeyword_contrast:
+case eCSSKeyword_opacity:
+case eCSSKeyword_saturate:
+AddCSSValuePercentNumber(restrictions,
+aCoeff1, funcArg1,
+aCoeff2, funcArg2,
+resultArg,
+initialVal);
+break;
+case eCSSKeyword_hue_rotate:
+AddCSSValueAngle(aCoeff1, funcArg1,
+aCoeff2, funcArg2,
+resultArg);
+break;
+case eCSSKeyword_drop_shadow: {
+nsCSSValueList* resultShadow = resultArg.SetListValue();
+nsAutoPtr<nsCSSValueList> shadowValue;
+nsCSSValueList **shadowTail = getter_Transfers(shadowValue);
+NS_ABORT_IF_FALSE(!funcArg1.GetListValue()->mNext &&
+!funcArg2.GetListValue()->mNext,
+"drop-shadow filter func doesn't support lists");
+if (!AddShadowItems(aCoeff1, funcArg1.GetListValue()->mValue,
+aCoeff2, funcArg2.GetListValue()->mValue,
+shadowTail)) {
+return false;
+}
+*resultShadow = *shadowValue;
+break;
+}
+default:
+NS_ABORT_IF_FALSE(false, "unknown filter function");
+return false;
+}
+*aResultTail = resultListEntry.forget();
+aResultTail = &(*aResultTail)->mNext;
+return true;
+}
+static bool
+AddFilterFunction(double aCoeff1, const nsCSSValueList* aList1,
+double aCoeff2, const nsCSSValueList* aList2,
+nsCSSValueList**& aResultTail)
+{
+NS_ABORT_IF_FALSE(aList1 || aList2,
+"one function list item must not be null");
+// Note that one of our arguments could be null, indicating that
+// it's the initial value. Rather than adding special null-handling
+// logic, we just check for null values and replace them with
+// 0 * the other value. That way, AddFilterFunctionImpl can assume
+// its args are non-null.
+if (!aList1) {
+return AddFilterFunctionImpl(aCoeff2, aList2, 0, aList2, aResultTail);
+}
+if (!aList2) {
+return AddFilterFunctionImpl(aCoeff1, aList1, 0, aList1, aResultTail);
+}
+return AddFilterFunctionImpl(aCoeff1, aList1, aCoeff2, aList2, aResultTail);
+}
+static nsCSSValueList*
+AddTransformLists(double aCoeff1, const nsCSSValueList* aList1,
+double aCoeff2, const nsCSSValueList* aList2)
+{
+nsAutoPtr<nsCSSValueList> result;
+nsCSSValueList **resultTail = getter_Transfers(result);
+do {
+nsRefPtr<nsCSSValue::Array> a1 = ToPrimitive(aList1->mValue.GetArrayValue()),
+a2 = ToPrimitive(aList2->mValue.GetArrayValue());
+NS_ABORT_IF_FALSE(TransformFunctionsMatch(nsStyleTransformMatrix::TransformFunctionOf(a1),
+nsStyleTransformMatrix::TransformFunctionOf(a2)),
+"transform function mismatch");
+NS_ABORT_IF_FALSE(!*resultTail,
+"resultTail isn't pointing to the tail (may leak)");
+nsCSSKeyword tfunc = nsStyleTransformMatrix::TransformFunctionOf(a1);
+nsRefPtr<nsCSSValue::Array> arr;
+if (tfunc != eCSSKeyword_matrix &&
+tfunc != eCSSKeyword_matrix3d &&
+tfunc != eCSSKeyword_interpolatematrix &&
+tfunc != eCSSKeyword_rotate3d &&
+tfunc != eCSSKeyword_perspective) {
+arr = nsStyleAnimation::AppendTransformFunction(tfunc, resultTail);
+}
+switch (tfunc) {
+case eCSSKeyword_translate3d: {
+NS_ABORT_IF_FALSE(a1->Count() == 4, "unexpected count");
+NS_ABORT_IF_FALSE(a2->Count() == 4, "unexpected count");
+AddTransformTranslate(aCoeff1, a1->Item(1), aCoeff2, a2->Item(1),
+arr->Item(1));
+AddTransformTranslate(aCoeff1, a1->Item(2), aCoeff2, a2->Item(2),
+arr->Item(2));
+AddTransformTranslate(aCoeff1, a1->Item(3), aCoeff2, a2->Item(3),
+arr->Item(3));
+break;
+}
+case eCSSKeyword_scale3d: {
+NS_ABORT_IF_FALSE(a1->Count() == 4, "unexpected count");
+NS_ABORT_IF_FALSE(a2->Count() == 4, "unexpected count");
+AddTransformScale(aCoeff1, a1->Item(1), aCoeff2, a2->Item(1),
+arr->Item(1));
+AddTransformScale(aCoeff1, a1->Item(2), aCoeff2, a2->Item(2),
+arr->Item(2));
+AddTransformScale(aCoeff1, a1->Item(3), aCoeff2, a2->Item(3),
+arr->Item(3));
+break;
+}
+// It would probably be nicer to animate skew in tangent space
+// rather than angle space.  However, it's easy to specify
+// skews with infinite tangents, and behavior changes pretty
+// drastically when crossing such skews (since the direction of
+// animation flips), so interop is probably more important here.
+case eCSSKeyword_skew: {
+NS_ABORT_IF_FALSE(a1->Count() == 2 || a1->Count() == 3,
+"unexpected count");
+NS_ABORT_IF_FALSE(a2->Count() == 2 || a2->Count() == 3,
+"unexpected count");
+nsCSSValue zero(0.0f, eCSSUnit_Radian);
+// Add Y component of skew.
+AddCSSValueAngle(aCoeff1,
+a1->Count() == 3 ? a1->Item(2) : zero,
+aCoeff2,
+a2->Count() == 3 ? a2->Item(2) : zero,
+arr->Item(2));
+// Add X component of skew (which can be merged with case below
+// in non-DEBUG).
+AddCSSValueAngle(aCoeff1, a1->Item(1), aCoeff2, a2->Item(1),
+arr->Item(1));
+break;
+}
+case eCSSKeyword_skewx:
+case eCSSKeyword_skewy:
+case eCSSKeyword_rotate:
+case eCSSKeyword_rotatex:
+case eCSSKeyword_rotatey:
+case eCSSKeyword_rotatez: {
+NS_ABORT_IF_FALSE(a1->Count() == 2, "unexpected count");
+NS_ABORT_IF_FALSE(a2->Count() == 2, "unexpected count");
+AddCSSValueAngle(aCoeff1, a1->Item(1), aCoeff2, a2->Item(1),
+arr->Item(1));
+break;
+}
+case eCSSKeyword_matrix:
+case eCSSKeyword_matrix3d:
+case eCSSKeyword_interpolatematrix:
+case eCSSKeyword_rotate3d:
+case eCSSKeyword_perspective: {
+// FIXME: If the matrix contains only numbers then we could decompose
+// here.
+// Construct temporary lists with only this item in them.
+nsCSSValueList tempList1, tempList2;
+tempList1.mValue = aList1->mValue;
+tempList2.mValue = aList2->mValue;
+if (aList1 == aList2) {
+*resultTail =
+AddDifferentTransformLists(aCoeff1, &tempList1, aCoeff2, &tempList1);
+} else {
+*resultTail =
+AddDifferentTransformLists(aCoeff1, &tempList1, aCoeff2, &tempList2);
+}
+// Now advance resultTail to point to the new tail slot.
+while (*resultTail) {
+resultTail = &(*resultTail)->mNext;
+}
+break;
+}
+default:
+NS_ABORT_IF_FALSE(false, "unknown transform function");
+}
+aList1 = aList1->mNext;
+aList2 = aList2->mNext;
+} while (aList1);
+NS_ABORT_IF_FALSE(!aList2, "list length mismatch");
+NS_ABORT_IF_FALSE(!*resultTail,
+"resultTail isn't pointing to the tail");
+return result.forget();
+}
+bool
+nsStyleAnimation::AddWeighted(nsCSSProperty aProperty,
+double aCoeff1, const Value& aValue1,
+double aCoeff2, const Value& aValue2,
+Value& aResultValue)
+{
+Unit commonUnit =
+GetCommonUnit(aProperty, aValue1.GetUnit(), aValue2.GetUnit());
+// Maybe need a followup method to convert the inputs into the common
+// unit-type, if they don't already match it. (Or would it make sense to do
+// that in GetCommonUnit? in which case maybe ConvertToCommonUnit would be
+// better.)
+switch (commonUnit) {
+case eUnit_Null:
+case eUnit_Auto:
+case eUnit_None:
+case eUnit_Normal:
+case eUnit_UnparsedString:
+return false;
+case eUnit_Enumerated:
+switch (aProperty) {
+case eCSSProperty_font_stretch: {
+// Animate just like eUnit_Integer.
+int32_t result = floor(aCoeff1 * double(aValue1.GetIntValue()) +
+aCoeff2 * double(aValue2.GetIntValue()));
+if (result < NS_STYLE_FONT_STRETCH_ULTRA_CONDENSED) {
+result = NS_STYLE_FONT_STRETCH_ULTRA_CONDENSED;
+} else if (result > NS_STYLE_FONT_STRETCH_ULTRA_EXPANDED) {
+result = NS_STYLE_FONT_STRETCH_ULTRA_EXPANDED;
+}
+aResultValue.SetIntValue(result, eUnit_Enumerated);
+return true;
+}
+default:
+return false;
+}
+case eUnit_Visibility: {
+int32_t enum1 = aValue1.GetIntValue();
+int32_t enum2 = aValue2.GetIntValue();
+if (enum1 == enum2) {
+aResultValue.SetIntValue(enum1, eUnit_Visibility);
+return true;
+}
+if ((enum1 == NS_STYLE_VISIBILITY_VISIBLE) ==
+(enum2 == NS_STYLE_VISIBILITY_VISIBLE)) {
+return false;
+}
+int32_t val1 = enum1 == NS_STYLE_VISIBILITY_VISIBLE;
+int32_t val2 = enum2 == NS_STYLE_VISIBILITY_VISIBLE;
+double interp = aCoeff1 * val1 + aCoeff2 * val2;
+int32_t result = interp > 0.0 ? NS_STYLE_VISIBILITY_VISIBLE
+: (val1 ? enum2 : enum1);
+aResultValue.SetIntValue(result, eUnit_Visibility);
+return true;
+}
+case eUnit_Integer: {
+// http://dev.w3.org/csswg/css3-transitions/#animation-of-property-types-
+// says we should use floor
+int32_t result = floor(aCoeff1 * double(aValue1.GetIntValue()) +
+aCoeff2 * double(aValue2.GetIntValue()));
+if (aProperty == eCSSProperty_font_weight) {
+if (result < 100) {
+result = 100;
+} else if (result > 900) {
+result = 900;
+}
+result -= result % 100;
+} else {
+result = RestrictValue(aProperty, result);
+}
+aResultValue.SetIntValue(result, eUnit_Integer);
+return true;
+}
+case eUnit_Coord: {
+aResultValue.SetCoordValue(RestrictValue(aProperty, NSToCoordRound(
+aCoeff1 * aValue1.GetCoordValue() +
+aCoeff2 * aValue2.GetCoordValue())));
+return true;
+}
+case eUnit_Percent: {
+aResultValue.SetPercentValue(RestrictValue(aProperty,
+aCoeff1 * aValue1.GetPercentValue() +
+aCoeff2 * aValue2.GetPercentValue()));
+return true;
+}
+case eUnit_Float: {
+// Special case for flex-grow and flex-shrink: animations are
+// disallowed between 0 and other values.
+if ((aProperty == eCSSProperty_flex_grow ||
+aProperty == eCSSProperty_flex_shrink) &&
+(aValue1.GetFloatValue() == 0.0f ||
+aValue2.GetFloatValue() == 0.0f) &&
+aValue1.GetFloatValue() != aValue2.GetFloatValue()) {
+return false;
+}
+aResultValue.SetFloatValue(RestrictValue(aProperty,
+aCoeff1 * aValue1.GetFloatValue() +
+aCoeff2 * aValue2.GetFloatValue()));
+return true;
+}
+case eUnit_Color: {
+nscolor color1 = aValue1.GetColorValue();
+nscolor color2 = aValue2.GetColorValue();
+// FIXME (spec): The CSS transitions spec doesn't say whether
+// colors are premultiplied, but things work better when they are,
+// so use premultiplication.  Spec issue is still open per
+// http://lists.w3.org/Archives/Public/www-style/2009Jul/0050.html
+// To save some math, scale the alpha down to a 0-1 scale, but
+// leave the color components on a 0-255 scale.
+double A1 = NS_GET_A(color1) * (1.0 / 255.0);
+double R1 = NS_GET_R(color1) * A1;
+double G1 = NS_GET_G(color1) * A1;
+double B1 = NS_GET_B(color1) * A1;
+double A2 = NS_GET_A(color2) * (1.0 / 255.0);
+double R2 = NS_GET_R(color2) * A2;
+double G2 = NS_GET_G(color2) * A2;
+double B2 = NS_GET_B(color2) * A2;
+double Aresf = (A1 * aCoeff1 + A2 * aCoeff2);
+nscolor resultColor;
+if (Aresf <= 0.0) {
+resultColor = NS_RGBA(0, 0, 0, 0);
+} else {
+if (Aresf > 1.0) {
+Aresf = 1.0;
+}
+double factor = 1.0 / Aresf;
+uint8_t Ares = NSToIntRound(Aresf * 255.0);
+uint8_t Rres = ClampColor((R1 * aCoeff1 + R2 * aCoeff2) * factor);
+uint8_t Gres = ClampColor((G1 * aCoeff1 + G2 * aCoeff2) * factor);
+uint8_t Bres = ClampColor((B1 * aCoeff1 + B2 * aCoeff2) * factor);
+resultColor = NS_RGBA(Rres, Gres, Bres, Ares);
+}
+aResultValue.SetColorValue(resultColor);
+return true;
+}
+case eUnit_Calc: {
+CalcValue v1 = ExtractCalcValue(aValue1);
+CalcValue v2 = ExtractCalcValue(aValue2);
+double len = aCoeff1 * v1.mLength + aCoeff2 * v2.mLength;
+double pct = aCoeff1 * v1.mPercent + aCoeff2 * v2.mPercent;
+bool hasPct = (aCoeff1 != 0.0 && v1.mHasPercent) ||
+(aCoeff2 != 0.0 && v2.mHasPercent);
+nsCSSValue *val = new nsCSSValue();
+nsCSSValue::Array *arr = nsCSSValue::Array::Create(1);
+val->SetArrayValue(arr, eCSSUnit_Calc);
+if (hasPct) {
+nsCSSValue::Array *arr2 = nsCSSValue::Array::Create(2);
+arr2->Item(0).SetFloatValue(len, eCSSUnit_Pixel);
+arr2->Item(1).SetPercentValue(pct);
+arr->Item(0).SetArrayValue(arr2, eCSSUnit_Calc_Plus);
+} else {
+arr->Item(0).SetFloatValue(len, eCSSUnit_Pixel);
+}
+aResultValue.SetAndAdoptCSSValueValue(val, eUnit_Calc);
+return true;
+}
+case eUnit_CSSValuePair: {
+const nsCSSValuePair *pair1 = aValue1.GetCSSValuePairValue();
+const nsCSSValuePair *pair2 = aValue2.GetCSSValuePairValue();
+nsCSSUnit unit[2];
+unit[0] = GetCommonUnit(aProperty, pair1->mXValue.GetUnit(),
+pair2->mXValue.GetUnit());
+unit[1] = GetCommonUnit(aProperty, pair1->mYValue.GetUnit(),
+pair2->mYValue.GetUnit());
+if (unit[0] == eCSSUnit_Null || unit[1] == eCSSUnit_Null ||
+unit[0] == eCSSUnit_URL || unit[0] == eCSSUnit_Enumerated) {
+return false;
+}
+nsAutoPtr<nsCSSValuePair> result(new nsCSSValuePair);
+static nsCSSValue nsCSSValuePair::* const pairValues[2] = {
+&nsCSSValuePair::mXValue, &nsCSSValuePair::mYValue
+};
+uint32_t restrictions = nsCSSProps::ValueRestrictions(aProperty);
+for (uint32_t i = 0; i < 2; ++i) {
+nsCSSValue nsCSSValuePair::*member = pairValues[i];
+if (!AddCSSValuePixelPercentCalc(restrictions, unit[i],
+aCoeff1, pair1->*member,
+aCoeff2, pair2->*member,
+result->*member) ) {
+NS_ABORT_IF_FALSE(false, "unexpected unit");
+return false;
+}
+}
+aResultValue.SetAndAdoptCSSValuePairValue(result.forget(),
+eUnit_CSSValuePair);
+return true;
+}
+case eUnit_CSSValueTriplet: {
+nsCSSValueTriplet triplet1(*aValue1.GetCSSValueTripletValue());
+nsCSSValueTriplet triplet2(*aValue2.GetCSSValueTripletValue());
+nsCSSUnit unit[3];
+unit[0] = GetCommonUnit(aProperty, triplet1.mXValue.GetUnit(),
+triplet2.mXValue.GetUnit());
+unit[1] = GetCommonUnit(aProperty, triplet1.mYValue.GetUnit(),
+triplet2.mYValue.GetUnit());
+unit[2] = GetCommonUnit(aProperty, triplet1.mZValue.GetUnit(),
+triplet2.mZValue.GetUnit());
+if (unit[0] == eCSSUnit_Null || unit[1] == eCSSUnit_Null ||
+unit[2] == eCSSUnit_Null) {
+return false;
+}
+nsAutoPtr<nsCSSValueTriplet> result(new nsCSSValueTriplet);
+static nsCSSValue nsCSSValueTriplet::* const tripletValues[3] = {
+&nsCSSValueTriplet::mXValue, &nsCSSValueTriplet::mYValue, &nsCSSValueTriplet::mZValue
+};
+uint32_t restrictions = nsCSSProps::ValueRestrictions(aProperty);
+for (uint32_t i = 0; i < 3; ++i) {
+nsCSSValue nsCSSValueTriplet::*member = tripletValues[i];
+if (!AddCSSValuePixelPercentCalc(restrictions, unit[i],
+aCoeff1, &triplet1->*member,
+aCoeff2, &triplet2->*member,
+result->*member) ) {
+NS_ABORT_IF_FALSE(false, "unexpected unit");
+return false;
+}
+}
+aResultValue.SetAndAdoptCSSValueTripletValue(result.forget(),
+eUnit_CSSValueTriplet);
+return true;
+}
+case eUnit_CSSRect: {
+NS_ABORT_IF_FALSE(nsCSSProps::ValueRestrictions(aProperty) == 0,
+"must add code for handling value restrictions");
+const nsCSSRect *rect1 = aValue1.GetCSSRectValue();
+const nsCSSRect *rect2 = aValue2.GetCSSRectValue();
+if (rect1->mTop.GetUnit() != rect2->mTop.GetUnit() ||
+rect1->mRight.GetUnit() != rect2->mRight.GetUnit() ||
+rect1->mBottom.GetUnit() != rect2->mBottom.GetUnit() ||
+rect1->mLeft.GetUnit() != rect2->mLeft.GetUnit()) {
+// At least until we have calc()
+return false;
+}
+nsAutoPtr<nsCSSRect> result(new nsCSSRect);
+for (uint32_t i = 0; i < ArrayLength(nsCSSRect::sides); ++i) {
+nsCSSValue nsCSSRect::*member = nsCSSRect::sides[i];
+NS_ABORT_IF_FALSE((rect1->*member).GetUnit() ==
+(rect2->*member).GetUnit(),
+"should have returned above");
+switch ((rect1->*member).GetUnit()) {
+case eCSSUnit_Pixel:
+AddCSSValuePixel(aCoeff1, rect1->*member, aCoeff2, rect2->*member,
+result->*member);
+break;
+case eCSSUnit_Auto:
+if (float(aCoeff1 + aCoeff2) != 1.0f) {
+// Interpolating between two auto values makes sense;
+// adding in other ratios does not.
+return false;
+}
+(result->*member).SetAutoValue();
+break;
+default:
+NS_ABORT_IF_FALSE(false, "unexpected unit");
+return false;
+}
+}
+aResultValue.SetAndAdoptCSSRectValue(result.forget(), eUnit_CSSRect);
+return true;
+}
+case eUnit_Dasharray: {
+const nsCSSValueList *list1 = aValue1.GetCSSValueListValue();
+const nsCSSValueList *list2 = aValue2.GetCSSValueListValue();
+uint32_t len1 = 0, len2 = 0;
+for (const nsCSSValueList *v = list1; v; v = v->mNext) {
+++len1;
+}
+for (const nsCSSValueList *v = list2; v; v = v->mNext) {
+++len2;
+}
+NS_ABORT_IF_FALSE(len1 > 0 && len2 > 0, "unexpected length");
+if (list1->mValue.GetUnit() == eCSSUnit_None ||
+list2->mValue.GetUnit() == eCSSUnit_None) {
+// One of our values is "none".  Can't do addition with that.
+NS_ABORT_IF_FALSE(
+(list1->mValue.GetUnit() != eCSSUnit_None || len1 == 1) &&
+(list2->mValue.GetUnit() != eCSSUnit_None || len2 == 1),
+"multi-value valuelist with 'none' as first element");
+return false;
+}
+nsAutoPtr<nsCSSValueList> result;
+nsCSSValueList **resultTail = getter_Transfers(result);
+for (uint32_t i = 0, i_end = EuclidLCM<uint32_t>(len1, len2); i != i_end; ++i) {
+const nsCSSValue &v1 = list1->mValue;
+const nsCSSValue &v2 = list2->mValue;
+NS_ABORT_IF_FALSE(v1.GetUnit() == eCSSUnit_Number ||
+v1.GetUnit() == eCSSUnit_Percent, "unexpected");
+NS_ABORT_IF_FALSE(v2.GetUnit() == eCSSUnit_Number ||
+v2.GetUnit() == eCSSUnit_Percent, "unexpected");
+if (v1.GetUnit() != v2.GetUnit()) {
+// Can't animate between lengths and percentages (until calc()).
+return false;
+}
+nsCSSValueList *item = new nsCSSValueList;
+if (!item) {
+return false;
+}
+*resultTail = item;
+resultTail = &item->mNext;
+if (v1.GetUnit() == eCSSUnit_Number) {
+AddCSSValueNumber(aCoeff1, v1, aCoeff2, v2, item->mValue,
+CSS_PROPERTY_VALUE_NONNEGATIVE);
+} else {
+AddCSSValuePercent(aCoeff1, v1, aCoeff2, v2, item->mValue,
+CSS_PROPERTY_VALUE_NONNEGATIVE);
+}
+list1 = list1->mNext;
+if (!list1) {
+list1 = aValue1.GetCSSValueListValue();
+}
+list2 = list2->mNext;
+if (!list2) {
+list2 = aValue2.GetCSSValueListValue();
+}
+}
+aResultValue.SetAndAdoptCSSValueListValue(result.forget(),
+eUnit_Dasharray);
+return true;
+}
+case eUnit_Shadow: {
+// This is implemented according to:
+// http://dev.w3.org/csswg/css3-transitions/#animation-of-property-types-
+// and the third item in the summary of:
+// http://lists.w3.org/Archives/Public/www-style/2009Jul/0050.html
+const nsCSSValueList *shadow1 = aValue1.GetCSSValueListValue();
+const nsCSSValueList *shadow2 = aValue2.GetCSSValueListValue();
+nsAutoPtr<nsCSSValueList> result;
+nsCSSValueList **resultTail = getter_Transfers(result);
+while (shadow1 && shadow2) {
+if (!AddShadowItems(aCoeff1, shadow1->mValue,
+aCoeff2, shadow2->mValue,
+resultTail)) {
+return false;
+}
+shadow1 = shadow1->mNext;
+shadow2 = shadow2->mNext;
+}
+if (shadow1 || shadow2) {
+const nsCSSValueList *longShadow;
+double longCoeff;
+if (shadow1) {
+longShadow = shadow1;
+longCoeff = aCoeff1;
+} else {
+longShadow = shadow2;
+longCoeff = aCoeff2;
+}
+while (longShadow) {
+// Passing coefficients that add to less than 1 produces the
+// desired result of interpolating "0 0 0 transparent" with
+// the current shadow.
+if (!AddShadowItems(longCoeff, longShadow->mValue,
+0.0, longShadow->mValue,
+resultTail)) {
+return false;
+}
+longShadow = longShadow->mNext;
+}
+}
+aResultValue.SetAndAdoptCSSValueListValue(result.forget(), eUnit_Shadow);
+return true;
+}
+case eUnit_Filter: {
+const nsCSSValueList *list1 = aValue1.GetCSSValueListValue();
+const nsCSSValueList *list2 = aValue2.GetCSSValueListValue();
+nsAutoPtr<nsCSSValueList> result;
+nsCSSValueList **resultTail = getter_Transfers(result);
+while (list1 || list2) {
+NS_ABORT_IF_FALSE(!*resultTail,
+"resultTail isn't pointing to the tail (may leak)");
+if ((list1 && list1->mValue.GetUnit() != eCSSUnit_Function) ||
+(list2 && list2->mValue.GetUnit() != eCSSUnit_Function)) {
+// If we don't have filter-functions, we must have filter-URLs, which
+// we can't add or interpolate.
+return false;
+}
+if (!AddFilterFunction(aCoeff1, list1, aCoeff2, list2, resultTail)) {
+// filter function mismatch
+return false;
+}
+// move to next list items
+if (list1) {
+list1 = list1->mNext;
+}
+if (list2) {
+list2 = list2->mNext;
+}
+}
+NS_ABORT_IF_FALSE(!*resultTail,
+"resultTail isn't pointing to the tail (may leak)");
+aResultValue.SetAndAdoptCSSValueListValue(result.forget(),
+eUnit_Filter);
+return true;
+}
+case eUnit_Transform: {
+const nsCSSValueList* list1 = aValue1.GetCSSValueSharedListValue()->mHead;
+const nsCSSValueList* list2 = aValue2.GetCSSValueSharedListValue()->mHead;
+MOZ_ASSERT(list1);
+MOZ_ASSERT(list2);
+// We want to avoid the matrix decomposition when we can, since
+// avoiding it can produce better results both for compound
+// transforms and for skew and skewY (see below).  We can do this
+// in two cases:
+//   (1) if one of the transforms is 'none'
+//   (2) if the lists have the same length and the transform
+//       functions match
+nsAutoPtr<nsCSSValueList> result;
+if (list1->mValue.GetUnit() == eCSSUnit_None) {
+if (list2->mValue.GetUnit() == eCSSUnit_None) {
+result = new nsCSSValueList;
+if (result) {
+result->mValue.SetNoneValue();
+}
+} else {
+result = AddTransformLists(0, list2, aCoeff2, list2);
+}
+} else {
+if (list2->mValue.GetUnit() == eCSSUnit_None) {
+result = AddTransformLists(0, list1, aCoeff1, list1);
+} else {
+bool match = true;
+{
+const nsCSSValueList *item1 = list1, *item2 = list2;
+do {
+nsCSSKeyword func1 = nsStyleTransformMatrix::TransformFunctionOf(
+item1->mValue.GetArrayValue());
+nsCSSKeyword func2 = nsStyleTransformMatrix::TransformFunctionOf(
+item2->mValue.GetArrayValue());
+if (!TransformFunctionsMatch(func1, func2)) {
+break;
+}
+item1 = item1->mNext;
+item2 = item2->mNext;
+} while (item1 && item2);
+if (item1 || item2) {
+// Either |break| above or length mismatch.
+match = false;
+}
+}
+if (match) {
+result = AddTransformLists(aCoeff1, list1, aCoeff2, list2);
+} else {
+result = AddDifferentTransformLists(aCoeff1, list1, aCoeff2, list2);
+}
+}
+}
+aResultValue.SetTransformValue(new nsCSSValueSharedList(result.forget()));
+return true;
+}
+case eUnit_BackgroundPosition: {
+const nsCSSValueList *position1 = aValue1.GetCSSValueListValue();
+const nsCSSValueList *position2 = aValue2.GetCSSValueListValue();
+nsAutoPtr<nsCSSValueList> result;
+nsCSSValueList **resultTail = getter_Transfers(result);
+while (position1 && position2) {
+nsCSSValueList *item = new nsCSSValueList;
+if (!item) {
+return false;
+}
+*resultTail = item;
+resultTail = &item->mNext;
+nsCSSValue::Array* bgPos1 = position1->mValue.GetArrayValue();
+nsCSSValue::Array* bgPos2 = position2->mValue.GetArrayValue();
+nsCSSValue::Array* bgPosRes = nsCSSValue::Array::Create(4);
+item->mValue.SetArrayValue(bgPosRes, eCSSUnit_Array);
+uint32_t restrictions = nsCSSProps::ValueRestrictions(aProperty);
+/* Only iterate over elements 1 and 3. The background position is
+* 'uncomputed' to only those elements.
+*/
+for (int i = 1; i < 4; i+=2) {
+const nsCSSValue& v1 = bgPos1->Item(i);
+const nsCSSValue& v2 = bgPos2->Item(i);
+nsCSSValue& vr = bgPosRes->Item(i);
+nsCSSUnit unit = GetCommonUnit(aProperty, v1.GetUnit(), v2.GetUnit());
+if (!AddCSSValuePixelPercentCalc(restrictions, unit, aCoeff1, v1,
+aCoeff2, v2, vr) ) {
+if (v1 != v2) {
+return false;
+}
+vr = v1;
+}
+}
+position1 = position1->mNext;
+position2 = position2->mNext;
+}
+// Check for different lengths
+if (position1 || position2) {
+return false;
+}
+aResultValue.SetAndAdoptCSSValueListValue(result.forget(),
+eUnit_BackgroundPosition);
+return true;
+}
+case eUnit_CSSValuePairList: {
+const nsCSSValuePairList *list1 = aValue1.GetCSSValuePairListValue();
+const nsCSSValuePairList *list2 = aValue2.GetCSSValuePairListValue();
+nsAutoPtr<nsCSSValuePairList> result;
+nsCSSValuePairList **resultTail = getter_Transfers(result);
+do {
+nsCSSValuePairList *item = new nsCSSValuePairList;
+if (!item) {
+return false;
+}
+*resultTail = item;
+resultTail = &item->mNext;
+static nsCSSValue nsCSSValuePairList::* const pairListValues[] = {
+&nsCSSValuePairList::mXValue,
+&nsCSSValuePairList::mYValue,
+};
+uint32_t restrictions = nsCSSProps::ValueRestrictions(aProperty);
+for (uint32_t i = 0; i < ArrayLength(pairListValues); ++i) {
+const nsCSSValue &v1 = list1->*(pairListValues[i]);
+const nsCSSValue &v2 = list2->*(pairListValues[i]);
+nsCSSValue &vr = item->*(pairListValues[i]);
+nsCSSUnit unit =
+GetCommonUnit(aProperty, v1.GetUnit(), v2.GetUnit());
+if (unit == eCSSUnit_Null) {
+return false;
+}
+if (!AddCSSValuePixelPercentCalc(restrictions, unit, aCoeff1, v1,
+aCoeff2, v2, vr) ) {
+if (v1 != v2) {
+return false;
+}
+vr = v1;
+}
+}
+list1 = list1->mNext;
+list2 = list2->mNext;
+} while (list1 && list2);
+if (list1 || list2) {
+// We can't interpolate lists of different lengths.
+return false;
+}
+aResultValue.SetAndAdoptCSSValuePairListValue(result.forget());
+return true;
+}
+}
+NS_ABORT_IF_FALSE(false, "Can't interpolate using the given common unit");
+return false;
+}
+already_AddRefed<css::StyleRule>
+BuildStyleRule(nsCSSProperty aProperty,
+dom::Element* aTargetElement,
+const nsAString& aSpecifiedValue,
+bool aUseSVGMode)
+{
+// Set up an empty CSS Declaration
+nsAutoPtr<css::Declaration> declaration(new css::Declaration());
+declaration->InitializeEmpty();
+bool changed; // ignored, but needed as outparam for ParseProperty
+nsIDocument* doc = aTargetElement->OwnerDoc();
+nsCOMPtr<nsIURI> baseURI = aTargetElement->GetBaseURI();
+nsCSSParser parser(doc->CSSLoader());
+nsCSSProperty propertyToCheck = nsCSSProps::IsShorthand(aProperty) ?
+nsCSSProps::SubpropertyEntryFor(aProperty)[0] : aProperty;
+// Get a parser, parse the property, and check for CSS parsing errors.
+// If any of these steps fails, we bail out and delete the declaration.
+if (NS_FAILED(parser.ParseProperty(aProperty, aSpecifiedValue,
+doc->GetDocumentURI(), baseURI,
+aTargetElement->NodePrincipal(),
+declaration, &changed, false,
+aUseSVGMode)) ||
+// check whether property parsed without CSS parsing errors
+!declaration->HasNonImportantValueFor(propertyToCheck)) {
+NS_WARNING("failure in BuildStyleRule");
+return nullptr;
+}
+nsRefPtr<css::StyleRule> rule = new css::StyleRule(nullptr, declaration.forget());
+return rule.forget();
+}
+inline
+already_AddRefed<nsStyleContext>
+LookupStyleContext(dom::Element* aElement)
+{
+nsIDocument* doc = aElement->GetCurrentDoc();
+nsIPresShell* shell = doc->GetShell();
+if (!shell) {
+return nullptr;
+}
+return nsComputedDOMStyle::GetStyleContextForElement(aElement, nullptr, shell);
+}
+bool
+nsStyleAnimation::ComputeValue(nsCSSProperty aProperty,
+dom::Element* aTargetElement,
+const nsAString& aSpecifiedValue,
+bool aUseSVGMode,
+Value& aComputedValue,
+bool* aIsContextSensitive)
+{
+NS_ABORT_IF_FALSE(aTargetElement, "null target element");
+NS_ABORT_IF_FALSE(aTargetElement->GetCurrentDoc(),
+"we should only be able to actively animate nodes that "
+"are in a document");
+nsCSSProperty propToParse =
+nsCSSProps::PropHasFlags(aProperty, CSS_PROPERTY_REPORT_OTHER_NAME)
+? nsCSSProps::OtherNameFor(aProperty) : aProperty;
+// Parse specified value into a temporary css::StyleRule
+nsRefPtr<css::StyleRule> styleRule =
+BuildStyleRule(propToParse, aTargetElement, aSpecifiedValue, aUseSVGMode);
+if (!styleRule) {
+return false;
+}
+if (nsCSSProps::IsShorthand(aProperty) ||
+nsCSSProps::kAnimTypeTable[aProperty] == eStyleAnimType_None) {
+// Just capture the specified value
+aComputedValue.SetUnparsedStringValue(nsString(aSpecifiedValue));
+if (aIsContextSensitive) {
+// Since we're just returning the string as-is, aComputedValue isn't going
+// to change depending on the context
+*aIsContextSensitive = false;
+}
+return true;
+}
+// Look up style context for our target element
+nsRefPtr<nsStyleContext> styleContext = LookupStyleContext(aTargetElement);
+if (!styleContext) {
+return false;
+}
+nsStyleSet* styleSet = styleContext->PresContext()->StyleSet();
+nsRefPtr<nsStyleContext> tmpStyleContext;
+if (aIsContextSensitive) {
+nsCOMArray<nsIStyleRule> ruleArray;
+ruleArray.AppendObject(styleSet->InitialStyleRule());
+ruleArray.AppendObject(styleRule);
+styleRule->RuleMatched();
+tmpStyleContext =
+styleSet->ResolveStyleByAddingRules(styleContext, ruleArray);
+if (!tmpStyleContext) {
+return false;
+}
+// Force walk of rule tree
+nsStyleStructID sid = nsCSSProps::kSIDTable[aProperty];
+tmpStyleContext->StyleData(sid);
+// If the rule node will have cached style data if the value is not
+// context-sensitive. So if there's nothing cached, it's not context
+// sensitive.
+*aIsContextSensitive =
+!tmpStyleContext->RuleNode()->NodeHasCachedData(sid);
+}
+// If we're not concerned whether the property is context sensitive then just
+// add the rule to a new temporary style context alongside the target
+// element's style context.
+// Also, if we previously discovered that this property IS context-sensitive
+// then we need to throw the temporary style context out since the property's
+// value may have been biased by the 'initial' values supplied.
+if (!aIsContextSensitive || *aIsContextSensitive) {
+nsCOMArray<nsIStyleRule> ruleArray;
+ruleArray.AppendObject(styleRule);
+styleRule->RuleMatched();
+tmpStyleContext =
+styleSet->ResolveStyleByAddingRules(styleContext, ruleArray);
+if (!tmpStyleContext) {
+return false;
+}
+}
+// Extract computed value of our property from the temporary style rule
+return ExtractComputedValue(aProperty, tmpStyleContext, aComputedValue);
+}
+bool
+nsStyleAnimation::UncomputeValue(nsCSSProperty aProperty,
+const Value& aComputedValue,
+nsCSSValue& aSpecifiedValue)
+{
+switch (aComputedValue.GetUnit()) {
+case eUnit_Normal:
+aSpecifiedValue.SetNormalValue();
+break;
+case eUnit_Auto:
+aSpecifiedValue.SetAutoValue();
+break;
+case eUnit_None:
+aSpecifiedValue.SetNoneValue();
+break;
+case eUnit_Enumerated:
+case eUnit_Visibility:
+aSpecifiedValue.
+SetIntValue(aComputedValue.GetIntValue(), eCSSUnit_Enumerated);
+break;
+case eUnit_Integer:
+aSpecifiedValue.
+SetIntValue(aComputedValue.GetIntValue(), eCSSUnit_Integer);
+break;
+case eUnit_Coord:
+nscoordToCSSValue(aComputedValue.GetCoordValue(), aSpecifiedValue);
+break;
+case eUnit_Percent:
+aSpecifiedValue.SetPercentValue(aComputedValue.GetPercentValue());
+break;
+case eUnit_Float:
+aSpecifiedValue.
+SetFloatValue(aComputedValue.GetFloatValue(), eCSSUnit_Number);
+break;
+case eUnit_Color:
+// colors can be alone, or part of a paint server
+aSpecifiedValue.SetColorValue(aComputedValue.GetColorValue());
+break;
+case eUnit_Calc: {
+nsCSSValue *val = aComputedValue.GetCSSValueValue();
+NS_ABORT_IF_FALSE(val->GetUnit() == eCSSUnit_Calc, "unexpected unit");
+aSpecifiedValue = *val;
+break;
+}
+case eUnit_CSSValuePair: {
+// Rule node processing expects pair values to be collapsed to a
+// single value if both halves would be equal, for most but not
+// all properties.  At present, all animatable properties that
+// use pairs do expect collapsing.
+const nsCSSValuePair* pair = aComputedValue.GetCSSValuePairValue();
+if (pair->mXValue == pair->mYValue) {
+aSpecifiedValue = pair->mXValue;
+} else {
+aSpecifiedValue.SetPairValue(pair);
+}
+} break;
+case eUnit_CSSValueTriplet: {
+// Rule node processing expects triplet values to be collapsed to a
+// single value if both halves would be equal, for most but not
+// all properties.  At present, all animatable properties that
+// use pairs do expect collapsing.
+const nsCSSValueTriplet* triplet = aComputedValue.GetCSSValueTripletValue();
+if (triplet->mXValue == triplet->mYValue && triplet->mYValue == triplet->mZValue) {
+aSpecifiedValue = triplet->mXValue;
+} else {
+aSpecifiedValue.SetTripletValue(triplet);
+}
+} break;
+case eUnit_CSSRect: {
+nsCSSRect& rect = aSpecifiedValue.SetRectValue();
+rect = *aComputedValue.GetCSSRectValue();
+} break;
+case eUnit_Dasharray:
+case eUnit_Shadow:
+case eUnit_Filter:
+case eUnit_BackgroundPosition:
+aSpecifiedValue.
+SetDependentListValue(aComputedValue.GetCSSValueListValue());
+break;
+case eUnit_Transform:
+aSpecifiedValue.
+SetSharedListValue(aComputedValue.GetCSSValueSharedListValue());
+break;
+case eUnit_CSSValuePairList:
+aSpecifiedValue.
+SetDependentPairListValue(aComputedValue.GetCSSValuePairListValue());
+break;
+default:
+return false;
+}
+return true;
+}
+bool
+nsStyleAnimation::UncomputeValue(nsCSSProperty aProperty,
+const Value& aComputedValue,
+nsAString& aSpecifiedValue)
+{
+aSpecifiedValue.Truncate(); // Clear outparam, if it's not already empty
+if (aComputedValue.GetUnit() == eUnit_UnparsedString) {
+aComputedValue.GetStringValue(aSpecifiedValue);
+return true;
+}
+nsCSSValue val;
+if (!nsStyleAnimation::UncomputeValue(aProperty, aComputedValue, val)) {
+return false;
+}
+val.AppendToString(aProperty, aSpecifiedValue, nsCSSValue::eNormalized);
+return true;
+}
+inline const void*
+StyleDataAtOffset(const void* aStyleStruct, ptrdiff_t aOffset)
+{
+return reinterpret_cast<const char*>(aStyleStruct) + aOffset;
+}
+inline void*
+StyleDataAtOffset(void* aStyleStruct, ptrdiff_t aOffset)
+{
+return reinterpret_cast<char*>(aStyleStruct) + aOffset;
+}
+static void
+ExtractBorderColor(nsStyleContext* aStyleContext, const void* aStyleBorder,
+mozilla::css::Side aSide, nsStyleAnimation::Value& aComputedValue)
+{
+nscolor color;
+bool foreground;
+static_cast<const nsStyleBorder*>(aStyleBorder)->
+GetBorderColor(aSide, color, foreground);
+if (foreground) {
+// FIXME: should add test for this
+color = aStyleContext->StyleColor()->mColor;
+}
+aComputedValue.SetColorValue(color);
+}
+static bool
+StyleCoordToValue(const nsStyleCoord& aCoord, nsStyleAnimation::Value& aValue)
+{
+switch (aCoord.GetUnit()) {
+case eStyleUnit_Normal:
+aValue.SetNormalValue();
+break;
+case eStyleUnit_Auto:
+aValue.SetAutoValue();
+break;
+case eStyleUnit_None:
+aValue.SetNoneValue();
+break;
+case eStyleUnit_Percent:
+aValue.SetPercentValue(aCoord.GetPercentValue());
+break;
+case eStyleUnit_Factor:
+aValue.SetFloatValue(aCoord.GetFactorValue());
+break;
+case eStyleUnit_Coord:
+aValue.SetCoordValue(aCoord.GetCoordValue());
+break;
+case eStyleUnit_Enumerated:
+aValue.SetIntValue(aCoord.GetIntValue(),
+nsStyleAnimation::eUnit_Enumerated);
+break;
+case eStyleUnit_Integer:
+aValue.SetIntValue(aCoord.GetIntValue(),
+nsStyleAnimation::eUnit_Integer);
+break;
+case eStyleUnit_Calc: {
+nsAutoPtr<nsCSSValue> val(new nsCSSValue);
+SetCalcValue(aCoord.GetCalcValue(), *val);
+aValue.SetAndAdoptCSSValueValue(val.forget(),
+nsStyleAnimation::eUnit_Calc);
+break;
+}
+default:
+return false;
+}
+return true;
+}
+static bool
+StyleCoordToCSSValue(const nsStyleCoord& aCoord, nsCSSValue& aCSSValue)
+{
+switch (aCoord.GetUnit()) {
+case eStyleUnit_Coord:
+nscoordToCSSValue(aCoord.GetCoordValue(), aCSSValue);
+break;
+case eStyleUnit_Factor:
+aCSSValue.SetFloatValue(aCoord.GetFactorValue(), eCSSUnit_Number);
+break;
+case eStyleUnit_Percent:
+aCSSValue.SetPercentValue(aCoord.GetPercentValue());
+break;
+case eStyleUnit_Calc:
+SetCalcValue(aCoord.GetCalcValue(), aCSSValue);
+break;
+case eStyleUnit_Degree:
+aCSSValue.SetFloatValue(aCoord.GetAngleValue(), eCSSUnit_Degree);
+break;
+case eStyleUnit_Grad:
+aCSSValue.SetFloatValue(aCoord.GetAngleValue(), eCSSUnit_Grad);
+break;
+case eStyleUnit_Radian:
+aCSSValue.SetFloatValue(aCoord.GetAngleValue(), eCSSUnit_Radian);
+break;
+case eStyleUnit_Turn:
+aCSSValue.SetFloatValue(aCoord.GetAngleValue(), eCSSUnit_Turn);
+break;
+default:
+NS_ABORT_IF_FALSE(false, "unexpected unit");
+return false;
+}
+return true;
+}
+/*
+* Assign |aOutput = aInput|, except with any non-pixel lengths
+* replaced with the equivalent in pixels, and any non-canonical calc()
+* expressions replaced with canonical ones.
+*/
+static void
+SubstitutePixelValues(nsStyleContext* aStyleContext,
+const nsCSSValue& aInput, nsCSSValue& aOutput)
+{
+if (aInput.IsCalcUnit()) {
+bool canStoreInRuleTree = true;
+nsRuleNode::ComputedCalc c =
+nsRuleNode::SpecifiedCalcToComputedCalc(aInput, aStyleContext,
+aStyleContext->PresContext(),
+canStoreInRuleTree);
+nsStyleCoord::Calc c2;
+c2.mLength = c.mLength;
+c2.mPercent = c.mPercent;
+c2.mHasPercent = true; // doesn't matter for transform translate
+SetCalcValue(&c2, aOutput);
+} else if (aInput.UnitHasArrayValue()) {
+const nsCSSValue::Array *inputArray = aInput.GetArrayValue();
+nsRefPtr<nsCSSValue::Array> outputArray =
+nsCSSValue::Array::Create(inputArray->Count());
+for (size_t i = 0, i_end = inputArray->Count(); i < i_end; ++i) {
+SubstitutePixelValues(aStyleContext,
+inputArray->Item(i), outputArray->Item(i));
+}
+aOutput.SetArrayValue(outputArray, aInput.GetUnit());
+} else if (aInput.IsLengthUnit() &&
+aInput.GetUnit() != eCSSUnit_Pixel) {
+bool canStoreInRuleTree = true;
+nscoord len = nsRuleNode::CalcLength(aInput, aStyleContext,
+aStyleContext->PresContext(),
+canStoreInRuleTree);
+aOutput.SetFloatValue(nsPresContext::AppUnitsToFloatCSSPixels(len),
+eCSSUnit_Pixel);
+} else {
+aOutput = aInput;
+}
+}
+bool
+nsStyleAnimation::ExtractComputedValue(nsCSSProperty aProperty,
+nsStyleContext* aStyleContext,
+Value& aComputedValue)
+{
+NS_ABORT_IF_FALSE(0 <= aProperty &&
+aProperty < eCSSProperty_COUNT_no_shorthands,
+"bad property");
+const void* styleStruct =
+aStyleContext->StyleData(nsCSSProps::kSIDTable[aProperty]);
+ptrdiff_t ssOffset = nsCSSProps::kStyleStructOffsetTable[aProperty];
+nsStyleAnimType animType = nsCSSProps::kAnimTypeTable[aProperty];
+NS_ABORT_IF_FALSE(0 <= ssOffset || animType == eStyleAnimType_Custom,
+"must be dealing with animatable property");
+switch (animType) {
+case eStyleAnimType_Custom:
+switch (aProperty) {
+// For border-width, ignore the border-image business (which
+// only exists until we update our implementation to the current
+// spec) and use GetComputedBorder
+#define BORDER_WIDTH_CASE(prop_, side_)                               \
+case prop_:                                                           \
+aComputedValue.SetCoordValue(                                       \
+static_cast<const nsStyleBorder*>(styleStruct)->                  \
+GetComputedBorder().side_);                                     \
+break;
+BORDER_WIDTH_CASE(eCSSProperty_border_bottom_width, bottom)
+BORDER_WIDTH_CASE(eCSSProperty_border_left_width_value, left)
+BORDER_WIDTH_CASE(eCSSProperty_border_right_width_value, right)
+BORDER_WIDTH_CASE(eCSSProperty_border_top_width, top)
+#undef BORDER_WIDTH_CASE
+case eCSSProperty__moz_column_rule_width:
+aComputedValue.SetCoordValue(
+static_cast<const nsStyleColumn*>(styleStruct)->
+GetComputedColumnRuleWidth());
+break;
+case eCSSProperty_border_bottom_color:
+ExtractBorderColor(aStyleContext, styleStruct, NS_SIDE_BOTTOM,
+aComputedValue);
+break;
+case eCSSProperty_border_left_color_value:
+ExtractBorderColor(aStyleContext, styleStruct, NS_SIDE_LEFT,
+aComputedValue);
+break;
+case eCSSProperty_border_right_color_value:
+ExtractBorderColor(aStyleContext, styleStruct, NS_SIDE_RIGHT,
+aComputedValue);
+break;
+case eCSSProperty_border_top_color:
+ExtractBorderColor(aStyleContext, styleStruct, NS_SIDE_TOP,
+aComputedValue);
+break;
+case eCSSProperty_outline_color: {
+const nsStyleOutline *styleOutline =
+static_cast<const nsStyleOutline*>(styleStruct);
+nscolor color;
+if (!styleOutline->GetOutlineColor(color))
+color = aStyleContext->StyleColor()->mColor;
+aComputedValue.SetColorValue(color);
+break;
+}
+case eCSSProperty__moz_column_rule_color: {
+const nsStyleColumn *styleColumn =
+static_cast<const nsStyleColumn*>(styleStruct);
+nscolor color;
+if (styleColumn->mColumnRuleColorIsForeground) {
+color = aStyleContext->StyleColor()->mColor;
+} else {
+color = styleColumn->mColumnRuleColor;
+}
+aComputedValue.SetColorValue(color);
+break;
+}
+case eCSSProperty__moz_column_count: {
+const nsStyleColumn *styleColumn =
+static_cast<const nsStyleColumn*>(styleStruct);
+if (styleColumn->mColumnCount == NS_STYLE_COLUMN_COUNT_AUTO) {
+aComputedValue.SetAutoValue();
+} else {
+aComputedValue.SetIntValue(styleColumn->mColumnCount,
+eUnit_Integer);
+}
+break;
+}
+case eCSSProperty_order: {
+const nsStylePosition *stylePosition =
+static_cast<const nsStylePosition*>(styleStruct);
+aComputedValue.SetIntValue(stylePosition->mOrder,
+eUnit_Integer);
+break;
+}
+case eCSSProperty_text_decoration_color: {
+const nsStyleTextReset *styleTextReset =
+static_cast<const nsStyleTextReset*>(styleStruct);
+nscolor color;
+bool isForeground;
+styleTextReset->GetDecorationColor(color, isForeground);
+if (isForeground) {
+color = aStyleContext->StyleColor()->mColor;
+}
+aComputedValue.SetColorValue(color);
+break;
+}
+case eCSSProperty_text_decoration_style: {
+uint8_t decorationStyle =
+static_cast<const nsStyleTextReset*>(styleStruct)->
+GetDecorationStyle();
+aComputedValue.SetIntValue(decorationStyle, eUnit_Enumerated);
+break;
+}
+case eCSSProperty_border_spacing: {
+const nsStyleTableBorder *styleTableBorder =
+static_cast<const nsStyleTableBorder*>(styleStruct);
+nsAutoPtr<nsCSSValuePair> pair(new nsCSSValuePair);
+if (!pair) {
+return false;
+}
+nscoordToCSSValue(styleTableBorder->mBorderSpacingX, pair->mXValue);
+nscoordToCSSValue(styleTableBorder->mBorderSpacingY, pair->mYValue);
+aComputedValue.SetAndAdoptCSSValuePairValue(pair.forget(),
+eUnit_CSSValuePair);
+break;
+}
+case eCSSProperty_transform_origin: {
+const nsStyleDisplay *styleDisplay =
+static_cast<const nsStyleDisplay*>(styleStruct);
+nsAutoPtr<nsCSSValueTriplet> triplet(new nsCSSValueTriplet);
+if (!triplet ||
+!StyleCoordToCSSValue(styleDisplay->mTransformOrigin[0],
+triplet->mXValue) ||
+!StyleCoordToCSSValue(styleDisplay->mTransformOrigin[1],
+triplet->mYValue) ||
+!StyleCoordToCSSValue(styleDisplay->mTransformOrigin[2],
+triplet->mZValue)) {
+return false;
+}
+aComputedValue.SetAndAdoptCSSValueTripletValue(triplet.forget(),
+eUnit_CSSValueTriplet);
+break;
+}
+case eCSSProperty_perspective_origin: {
+const nsStyleDisplay *styleDisplay =
+static_cast<const nsStyleDisplay*>(styleStruct);
+nsAutoPtr<nsCSSValuePair> pair(new nsCSSValuePair);
+if (!pair ||
+!StyleCoordToCSSValue(styleDisplay->mPerspectiveOrigin[0],
+pair->mXValue) ||
+!StyleCoordToCSSValue(styleDisplay->mPerspectiveOrigin[1],
+pair->mYValue)) {
+return false;
+}
+aComputedValue.SetAndAdoptCSSValuePairValue(pair.forget(),
+eUnit_CSSValuePair);
+break;
+}
+case eCSSProperty_stroke_dasharray: {
+const nsStyleSVG *svg = static_cast<const nsStyleSVG*>(styleStruct);
+NS_ABORT_IF_FALSE((svg->mStrokeDasharray != nullptr) ==
+(svg->mStrokeDasharrayLength != 0),
+"pointer/length mismatch");
+nsAutoPtr<nsCSSValueList> result;
+if (svg->mStrokeDasharray) {
+NS_ABORT_IF_FALSE(svg->mStrokeDasharrayLength > 0,
+"non-null list should have positive length");
+nsCSSValueList **resultTail = getter_Transfers(result);
+for (uint32_t i = 0, i_end = svg->mStrokeDasharrayLength;
+i != i_end; ++i) {
+nsCSSValueList *item = new nsCSSValueList;
+if (!item) {
+return false;
+}
+*resultTail = item;
+resultTail = &item->mNext;
+const nsStyleCoord &coord = svg->mStrokeDasharray[i];
+nsCSSValue &value = item->mValue;
+switch (coord.GetUnit()) {
+case eStyleUnit_Coord:
+// Number means the same thing as length; we want to
+// animate them the same way.  Normalize both to number
+// since it has more accuracy (float vs nscoord).
+value.SetFloatValue(nsPresContext::
+AppUnitsToFloatCSSPixels(coord.GetCoordValue()),
+eCSSUnit_Number);
+break;
+case eStyleUnit_Factor:
+value.SetFloatValue(coord.GetFactorValue(),
+eCSSUnit_Number);
+break;
+case eStyleUnit_Percent:
+value.SetPercentValue(coord.GetPercentValue());
+break;
+default:
+NS_ABORT_IF_FALSE(false, "unexpected unit");
+return false;
+}
+}
+} else {
+result = new nsCSSValueList;
+if (!result) {
+return false;
+}
+result->mValue.SetNoneValue();
+}
+aComputedValue.SetAndAdoptCSSValueListValue(result.forget(),
+eUnit_Dasharray);
+break;
+}
+case eCSSProperty_font_stretch: {
+int16_t stretch =
+static_cast<const nsStyleFont*>(styleStruct)->mFont.stretch;
+static_assert(NS_STYLE_FONT_STRETCH_ULTRA_CONDENSED == -4 &&
+NS_STYLE_FONT_STRETCH_ULTRA_EXPANDED == 4,
+"font stretch constants not as expected");
+if (stretch < NS_STYLE_FONT_STRETCH_ULTRA_CONDENSED ||
+stretch > NS_STYLE_FONT_STRETCH_ULTRA_EXPANDED) {
+return false;
+}
+aComputedValue.SetIntValue(stretch, eUnit_Enumerated);
+return true;
+}
+case eCSSProperty_font_weight: {
+uint16_t weight =
+static_cast<const nsStyleFont*>(styleStruct)->mFont.weight;
+if (weight % 100 != 0) {
+return false;
+}
+aComputedValue.SetIntValue(weight, eUnit_Integer);
+return true;
+}
+case eCSSProperty_image_region: {
+const nsStyleList *list =
+static_cast<const nsStyleList*>(styleStruct);
+const nsRect &srect = list->mImageRegion;
+if (srect.IsEmpty()) {
+aComputedValue.SetAutoValue();
+break;
+}
+nsCSSRect *vrect = new nsCSSRect;
+nscoordToCSSValue(srect.x, vrect->mLeft);
+nscoordToCSSValue(srect.y, vrect->mTop);
+nscoordToCSSValue(srect.XMost(), vrect->mRight);
+nscoordToCSSValue(srect.YMost(), vrect->mBottom);
+aComputedValue.SetAndAdoptCSSRectValue(vrect, eUnit_CSSRect);
+break;
+}
+case eCSSProperty_clip: {
+const nsStyleDisplay *display =
+static_cast<const nsStyleDisplay*>(styleStruct);
+if (!(display->mClipFlags & NS_STYLE_CLIP_RECT)) {
+aComputedValue.SetAutoValue();
+} else {
+nsCSSRect *vrect = new nsCSSRect;
+const nsRect &srect = display->mClip;
+if (display->mClipFlags & NS_STYLE_CLIP_TOP_AUTO) {
+vrect->mTop.SetAutoValue();
+} else {
+nscoordToCSSValue(srect.y, vrect->mTop);
+}
+if (display->mClipFlags & NS_STYLE_CLIP_RIGHT_AUTO) {
+vrect->mRight.SetAutoValue();
+} else {
+nscoordToCSSValue(srect.XMost(), vrect->mRight);
+}
+if (display->mClipFlags & NS_STYLE_CLIP_BOTTOM_AUTO) {
+vrect->mBottom.SetAutoValue();
+} else {
+nscoordToCSSValue(srect.YMost(), vrect->mBottom);
+}
+if (display->mClipFlags & NS_STYLE_CLIP_LEFT_AUTO) {
+vrect->mLeft.SetAutoValue();
+} else {
+nscoordToCSSValue(srect.x, vrect->mLeft);
+}
+aComputedValue.SetAndAdoptCSSRectValue(vrect, eUnit_CSSRect);
+}
+break;
+}
+case eCSSProperty_background_position: {
+const nsStyleBackground *bg =
+static_cast<const nsStyleBackground*>(styleStruct);
+nsAutoPtr<nsCSSValueList> result;
+nsCSSValueList **resultTail = getter_Transfers(result);
+NS_ABORT_IF_FALSE(bg->mPositionCount > 0, "unexpected count");
+for (uint32_t i = 0, i_end = bg->mPositionCount; i != i_end; ++i) {
+nsCSSValueList *item = new nsCSSValueList;
+*resultTail = item;
+resultTail = &item->mNext;
+nsRefPtr<nsCSSValue::Array> bgArray = nsCSSValue::Array::Create(4);
+item->mValue.SetArrayValue(bgArray.get(), eCSSUnit_Array);
+const nsStyleBackground::Position &pos = bg->mLayers[i].mPosition;
+// XXXbz is there a good reason we can't just
+// SetCalcValue(&pos.mXPosition, item->mXValue) here?
+nsCSSValue &xValue = bgArray->Item(1),
+&yValue = bgArray->Item(3);
+if (!pos.mXPosition.mHasPercent) {
+NS_ABORT_IF_FALSE(pos.mXPosition.mPercent == 0.0f,
+"Shouldn't have mPercent!");
+nscoordToCSSValue(pos.mXPosition.mLength, xValue);
+} else if (pos.mXPosition.mLength == 0) {
+xValue.SetPercentValue(pos.mXPosition.mPercent);
+} else {
+SetCalcValue(&pos.mXPosition, xValue);
+}
+if (!pos.mYPosition.mHasPercent) {
+NS_ABORT_IF_FALSE(pos.mYPosition.mPercent == 0.0f,
+"Shouldn't have mPercent!");
+nscoordToCSSValue(pos.mYPosition.mLength, yValue);
+} else if (pos.mYPosition.mLength == 0) {
+yValue.SetPercentValue(pos.mYPosition.mPercent);
+} else {
+SetCalcValue(&pos.mYPosition, yValue);
+}
+}
+aComputedValue.SetAndAdoptCSSValueListValue(result.forget(),
+eUnit_BackgroundPosition);
+break;
+}
+case eCSSProperty_background_size: {
+const nsStyleBackground *bg =
+static_cast<const nsStyleBackground*>(styleStruct);
+nsAutoPtr<nsCSSValuePairList> result;
+nsCSSValuePairList **resultTail = getter_Transfers(result);
+NS_ABORT_IF_FALSE(bg->mSizeCount > 0, "unexpected count");
+for (uint32_t i = 0, i_end = bg->mSizeCount; i != i_end; ++i) {
+nsCSSValuePairList *item = new nsCSSValuePairList;
+*resultTail = item;
+resultTail = &item->mNext;
+const nsStyleBackground::Size &size = bg->mLayers[i].mSize;
+switch (size.mWidthType) {
+case nsStyleBackground::Size::eContain:
+case nsStyleBackground::Size::eCover:
+item->mXValue.SetIntValue(size.mWidthType,
+eCSSUnit_Enumerated);
+break;
+case nsStyleBackground::Size::eAuto:
+item->mXValue.SetAutoValue();
+break;
+case nsStyleBackground::Size::eLengthPercentage:
+// XXXbz is there a good reason we can't just
+// SetCalcValue(&size.mWidth, item->mXValue) here?
+if (!size.mWidth.mHasPercent &&
+// negative values must have come from calc()
+size.mWidth.mLength >= 0) {
+NS_ABORT_IF_FALSE(size.mWidth.mPercent == 0.0f,
+"Shouldn't have mPercent");
+nscoordToCSSValue(size.mWidth.mLength, item->mXValue);
+} else if (size.mWidth.mLength == 0 &&
+// negative values must have come from calc()
+size.mWidth.mPercent >= 0.0f) {
+item->mXValue.SetPercentValue(size.mWidth.mPercent);
+} else {
+SetCalcValue(&size.mWidth, item->mXValue);
+}
+break;
+}
+switch (size.mHeightType) {
+case nsStyleBackground::Size::eContain:
+case nsStyleBackground::Size::eCover:
+// leave it null
+break;
+case nsStyleBackground::Size::eAuto:
+item->mYValue.SetAutoValue();
+break;
+case nsStyleBackground::Size::eLengthPercentage:
+// XXXbz is there a good reason we can't just
+// SetCalcValue(&size.mHeight, item->mYValue) here?
+if (!size.mHeight.mHasPercent &&
+// negative values must have come from calc()
+size.mHeight.mLength >= 0) {
+NS_ABORT_IF_FALSE(size.mHeight.mPercent == 0.0f,
+"Shouldn't have mPercent");
+nscoordToCSSValue(size.mHeight.mLength, item->mYValue);
+} else if (size.mHeight.mLength == 0 &&
+// negative values must have come from calc()
+size.mHeight.mPercent >= 0.0f) {
+item->mYValue.SetPercentValue(size.mHeight.mPercent);
+} else {
+SetCalcValue(&size.mHeight, item->mYValue);
+}
+break;
+}
+}
+aComputedValue.SetAndAdoptCSSValuePairListValue(result.forget());
+break;
+}
+case eCSSProperty_filter: {
+const nsStyleSVGReset *svgReset =
+static_cast<const nsStyleSVGReset*>(styleStruct);
+const nsTArray<nsStyleFilter>& filters = svgReset->mFilters;
+nsAutoPtr<nsCSSValueList> result;
+nsCSSValueList **resultTail = getter_Transfers(result);
+for (uint32_t i = 0; i < filters.Length(); ++i) {
+nsCSSValueList *item = new nsCSSValueList;
+*resultTail = item;
+resultTail = &item->mNext;
+const nsStyleFilter& filter = filters[i];
+int32_t type = filter.GetType();
+if (type == NS_STYLE_FILTER_URL) {
+nsIDocument* doc = aStyleContext->PresContext()->Document();
+nsRefPtr<nsStringBuffer> uriAsStringBuffer =
+GetURIAsUtf16StringBuffer(filter.GetURL());
+nsRefPtr<mozilla::css::URLValue> url =
+new mozilla::css::URLValue(filter.GetURL(),
+uriAsStringBuffer,
+doc->GetDocumentURI(),
+doc->NodePrincipal());
+item->mValue.SetURLValue(url);
+} else {
+nsCSSKeyword functionName =
+nsCSSProps::ValueToKeywordEnum(type,
+nsCSSProps::kFilterFunctionKTable);
+nsCSSValue::Array* filterArray =
+item->mValue.InitFunction(functionName, 1);
+if (type >= NS_STYLE_FILTER_BLUR && type <= NS_STYLE_FILTER_HUE_ROTATE) {
+if (!StyleCoordToCSSValue(
+filter.GetFilterParameter(),
+filterArray->Item(1))) {
+return false;
+}
+} else if (type == NS_STYLE_FILTER_DROP_SHADOW) {
+nsCSSValueList* shadowResult = filterArray->Item(1).SetListValue();
+nsAutoPtr<nsCSSValueList> tmpShadowValue;
+nsCSSValueList **tmpShadowResultTail = getter_Transfers(tmpShadowValue);
+nsCSSShadowArray* shadowArray = filter.GetDropShadow();
+NS_ABORT_IF_FALSE(shadowArray->Length() == 1,
+"expected exactly one shadow");
+AppendCSSShadowValue(shadowArray->ShadowAt(0), tmpShadowResultTail);
+*shadowResult = *tmpShadowValue;
+} else {
+// We checked all possible nsStyleFilter types but
+// NS_STYLE_FILTER_NULL before. We should never enter this path.
+NS_NOTREACHED("no other filter functions defined");
+return false;
+}
+}
+}
+aComputedValue.SetAndAdoptCSSValueListValue(result.forget(),
+eUnit_Filter);
+break;
+}
+case eCSSProperty_transform: {
+const nsStyleDisplay *display =
+static_cast<const nsStyleDisplay*>(styleStruct);
+nsAutoPtr<nsCSSValueList> result;
+if (display->mSpecifiedTransform) {
+// Clone, and convert all lengths (not percents) to pixels.
+nsCSSValueList **resultTail = getter_Transfers(result);
+for (const nsCSSValueList *l = display->mSpecifiedTransform->mHead;
+l; l = l->mNext) {
+nsCSSValueList *clone = new nsCSSValueList;
+*resultTail = clone;
+resultTail = &clone->mNext;
+SubstitutePixelValues(aStyleContext, l->mValue, clone->mValue);
+}
+} else {
+result = new nsCSSValueList();
+result->mValue.SetNoneValue();
+}
+aComputedValue.SetTransformValue(
+new nsCSSValueSharedList(result.forget()));
+break;
+}
+default:
+NS_ABORT_IF_FALSE(false, "missing property implementation");
+return false;
+};
+return true;
+case eStyleAnimType_Coord:
+return StyleCoordToValue(*static_cast<const nsStyleCoord*>(
+StyleDataAtOffset(styleStruct, ssOffset)), aComputedValue);
+case eStyleAnimType_Sides_Top:
+case eStyleAnimType_Sides_Right:
+case eStyleAnimType_Sides_Bottom:
+case eStyleAnimType_Sides_Left: {
+static_assert(
+NS_SIDE_TOP    == eStyleAnimType_Sides_Top   -eStyleAnimType_Sides_Top &&
+NS_SIDE_RIGHT  == eStyleAnimType_Sides_Right -eStyleAnimType_Sides_Top &&
+NS_SIDE_BOTTOM == eStyleAnimType_Sides_Bottom-eStyleAnimType_Sides_Top &&
+NS_SIDE_LEFT   == eStyleAnimType_Sides_Left  -eStyleAnimType_Sides_Top,
+"box side constants out of sync with animation side constants");
+const nsStyleCoord &coord = static_cast<const nsStyleSides*>(
+StyleDataAtOffset(styleStruct, ssOffset))->
+Get(mozilla::css::Side(animType - eStyleAnimType_Sides_Top));
+return StyleCoordToValue(coord, aComputedValue);
+}
+case eStyleAnimType_Corner_TopLeft:
+case eStyleAnimType_Corner_TopRight:
+case eStyleAnimType_Corner_BottomRight:
+case eStyleAnimType_Corner_BottomLeft: {
+static_assert(
+NS_CORNER_TOP_LEFT     == eStyleAnimType_Corner_TopLeft -
+eStyleAnimType_Corner_TopLeft        &&
+NS_CORNER_TOP_RIGHT    == eStyleAnimType_Corner_TopRight -
+eStyleAnimType_Corner_TopLeft        &&
+NS_CORNER_BOTTOM_RIGHT == eStyleAnimType_Corner_BottomRight -
+eStyleAnimType_Corner_TopLeft        &&
+NS_CORNER_BOTTOM_LEFT  == eStyleAnimType_Corner_BottomLeft -
+eStyleAnimType_Corner_TopLeft,
+"box corner constants out of sync with animation corner constants");
+const nsStyleCorners *corners = static_cast<const nsStyleCorners*>(
+StyleDataAtOffset(styleStruct, ssOffset));
+uint8_t fullCorner = animType - eStyleAnimType_Corner_TopLeft;
+const nsStyleCoord &horiz =
+corners->Get(NS_FULL_TO_HALF_CORNER(fullCorner, false));
+const nsStyleCoord &vert =
+corners->Get(NS_FULL_TO_HALF_CORNER(fullCorner, true));
+nsAutoPtr<nsCSSValuePair> pair(new nsCSSValuePair);
+if (!pair ||
+!StyleCoordToCSSValue(horiz, pair->mXValue) ||
+!StyleCoordToCSSValue(vert, pair->mYValue)) {
+return false;
+}
+aComputedValue.SetAndAdoptCSSValuePairValue(pair.forget(),
+eUnit_CSSValuePair);
+return true;
+}
+case eStyleAnimType_nscoord:
+aComputedValue.SetCoordValue(*static_cast<const nscoord*>(
+StyleDataAtOffset(styleStruct, ssOffset)));
+return true;
+case eStyleAnimType_EnumU8:
+aComputedValue.SetIntValue(*static_cast<const uint8_t*>(
+StyleDataAtOffset(styleStruct, ssOffset)), eUnit_Enumerated);
+return true;
+case eStyleAnimType_float:
+aComputedValue.SetFloatValue(*static_cast<const float*>(
+StyleDataAtOffset(styleStruct, ssOffset)));
+if (aProperty == eCSSProperty_font_size_adjust &&
+aComputedValue.GetFloatValue() == 0.0f) {
+// In nsStyleFont, we set mFont.sizeAdjust to 0 to represent
+// font-size-adjust: none.  Here, we have to treat this as a keyword
+// instead of a float value, to make sure we don't end up doing
+// interpolation with it.
+aComputedValue.SetNoneValue();
+}
+return true;
+case eStyleAnimType_Color:
+aComputedValue.SetColorValue(*static_cast<const nscolor*>(
+StyleDataAtOffset(styleStruct, ssOffset)));
+return true;
+case eStyleAnimType_PaintServer: {
+const nsStyleSVGPaint &paint = *static_cast<const nsStyleSVGPaint*>(
+StyleDataAtOffset(styleStruct, ssOffset));
+if (paint.mType == eStyleSVGPaintType_Color) {
+aComputedValue.SetColorValue(paint.mPaint.mColor);
+return true;
+}
+if (paint.mType == eStyleSVGPaintType_Server) {
+if (!paint.mPaint.mPaintServer) {
+NS_WARNING("Null paint server");
+return false;
+}
+nsAutoPtr<nsCSSValuePair> pair(new nsCSSValuePair);
+nsRefPtr<nsStringBuffer> uriAsStringBuffer =
+GetURIAsUtf16StringBuffer(paint.mPaint.mPaintServer);
+NS_ENSURE_TRUE(!!uriAsStringBuffer, false);
+nsIDocument* doc = aStyleContext->PresContext()->Document();
+nsRefPtr<mozilla::css::URLValue> url =
+new mozilla::css::URLValue(paint.mPaint.mPaintServer,
+uriAsStringBuffer,
+doc->GetDocumentURI(),
+doc->NodePrincipal());
+pair->mXValue.SetURLValue(url);
+pair->mYValue.SetColorValue(paint.mFallbackColor);
+aComputedValue.SetAndAdoptCSSValuePairValue(pair.forget(),
+eUnit_CSSValuePair);
+return true;
+}
+if (paint.mType == eStyleSVGPaintType_ContextFill ||
+paint.mType == eStyleSVGPaintType_ContextStroke) {
+nsAutoPtr<nsCSSValuePair> pair(new nsCSSValuePair);
+pair->mXValue.SetIntValue(paint.mType == eStyleSVGPaintType_ContextFill ?
+NS_COLOR_CONTEXT_FILL : NS_COLOR_CONTEXT_STROKE,
+eCSSUnit_Enumerated);
+pair->mYValue.SetColorValue(paint.mFallbackColor);
+aComputedValue.SetAndAdoptCSSValuePairValue(pair.forget(),
+eUnit_CSSValuePair);
+return true;
+}
+NS_ABORT_IF_FALSE(paint.mType == eStyleSVGPaintType_None,
+"Unexpected SVG paint type");
+aComputedValue.SetNoneValue();
+return true;
+}
+case eStyleAnimType_Shadow: {
+const nsCSSShadowArray *shadowArray =
+*static_cast<const nsRefPtr<nsCSSShadowArray>*>(
+StyleDataAtOffset(styleStruct, ssOffset));
+if (!shadowArray) {
+aComputedValue.SetAndAdoptCSSValueListValue(nullptr, eUnit_Shadow);
+return true;
+}
+nsAutoPtr<nsCSSValueList> result;
+nsCSSValueList **resultTail = getter_Transfers(result);
+for (uint32_t i = 0, i_end = shadowArray->Length(); i < i_end; ++i) {
+AppendCSSShadowValue(shadowArray->ShadowAt(i), resultTail);
+}
+aComputedValue.SetAndAdoptCSSValueListValue(result.forget(),
+eUnit_Shadow);
+return true;
+}
+case eStyleAnimType_None:
+NS_NOTREACHED("shouldn't use on non-animatable properties");
+}
+return false;
+}
+nsStyleAnimation::Value::Value(int32_t aInt, Unit aUnit,
+IntegerConstructorType)
+{
+NS_ASSERTION(IsIntUnit(aUnit), "unit must be of integer type");
+mUnit = aUnit;
+mValue.mInt = aInt;
+}
+nsStyleAnimation::Value::Value(nscoord aLength, CoordConstructorType)
+{
+mUnit = eUnit_Coord;
+mValue.mCoord = aLength;
+}
+nsStyleAnimation::Value::Value(float aPercent, PercentConstructorType)
+{
+mUnit = eUnit_Percent;
+mValue.mFloat = aPercent;
+MOZ_ASSERT(!mozilla::IsNaN(mValue.mFloat));
+}
+nsStyleAnimation::Value::Value(float aFloat, FloatConstructorType)
+{
+mUnit = eUnit_Float;
+mValue.mFloat = aFloat;
+MOZ_ASSERT(!mozilla::IsNaN(mValue.mFloat));
+}
+nsStyleAnimation::Value::Value(nscolor aColor, ColorConstructorType)
+{
+mUnit = eUnit_Color;
+mValue.mColor = aColor;
+}
+nsStyleAnimation::Value&
+nsStyleAnimation::Value::operator=(const Value& aOther)
+{
+FreeValue();
+mUnit = aOther.mUnit;
+switch (mUnit) {
+case eUnit_Null:
+case eUnit_Normal:
+case eUnit_Auto:
+case eUnit_None:
+break;
+case eUnit_Enumerated:
+case eUnit_Visibility:
+case eUnit_Integer:
+mValue.mInt = aOther.mValue.mInt;
+break;
+case eUnit_Coord:
+mValue.mCoord = aOther.mValue.mCoord;
+break;
+case eUnit_Percent:
+case eUnit_Float:
+mValue.mFloat = aOther.mValue.mFloat;
+MOZ_ASSERT(!mozilla::IsNaN(mValue.mFloat));
+break;
+case eUnit_Color:
+mValue.mColor = aOther.mValue.mColor;
+break;
+case eUnit_Calc:
+NS_ABORT_IF_FALSE(aOther.mValue.mCSSValue, "values may not be null");
+mValue.mCSSValue = new nsCSSValue(*aOther.mValue.mCSSValue);
+if (!mValue.mCSSValue) {
+mUnit = eUnit_Null;
+}
+break;
+case eUnit_CSSValuePair:
+NS_ABORT_IF_FALSE(aOther.mValue.mCSSValuePair,
+"value pairs may not be null");
+mValue.mCSSValuePair = new nsCSSValuePair(*aOther.mValue.mCSSValuePair);
+if (!mValue.mCSSValuePair) {
+mUnit = eUnit_Null;
+}
+break;
+case eUnit_CSSValueTriplet:
+NS_ABORT_IF_FALSE(aOther.mValue.mCSSValueTriplet,
+"value triplets may not be null");
+mValue.mCSSValueTriplet = new nsCSSValueTriplet(*aOther.mValue.mCSSValueTriplet);
+if (!mValue.mCSSValueTriplet) {
+mUnit = eUnit_Null;
+}
+break;
+case eUnit_CSSRect:
+NS_ABORT_IF_FALSE(aOther.mValue.mCSSRect, "rects may not be null");
+mValue.mCSSRect = new nsCSSRect(*aOther.mValue.mCSSRect);
+if (!mValue.mCSSRect) {
+mUnit = eUnit_Null;
+}
+break;
+case eUnit_Filter:
+case eUnit_Dasharray:
+case eUnit_Shadow:
+case eUnit_BackgroundPosition:
+NS_ABORT_IF_FALSE(mUnit == eUnit_Shadow || mUnit == eUnit_Filter ||
+aOther.mValue.mCSSValueList,
+"value lists other than shadows and filters may not be null");
+if (aOther.mValue.mCSSValueList) {
+mValue.mCSSValueList = aOther.mValue.mCSSValueList->Clone();
+if (!mValue.mCSSValueList) {
+mUnit = eUnit_Null;
+}
+} else {
+mValue.mCSSValueList = nullptr;
+}
+break;
+case eUnit_Transform:
+mValue.mCSSValueSharedList = aOther.mValue.mCSSValueSharedList;
+mValue.mCSSValueSharedList->AddRef();
+break;
+case eUnit_CSSValuePairList:
+NS_ABORT_IF_FALSE(aOther.mValue.mCSSValuePairList,
+"value pair lists may not be null");
+mValue.mCSSValuePairList = aOther.mValue.mCSSValuePairList->Clone();
+if (!mValue.mCSSValuePairList) {
+mUnit = eUnit_Null;
+}
+break;
+case eUnit_UnparsedString:
+NS_ABORT_IF_FALSE(aOther.mValue.mString, "expecting non-null string");
+mValue.mString = aOther.mValue.mString;
+mValue.mString->AddRef();
+break;
+}
+return *this;
+}
+void
+nsStyleAnimation::Value::SetNormalValue()
+{
+FreeValue();
+mUnit = eUnit_Normal;
+}
+void
+nsStyleAnimation::Value::SetAutoValue()
+{
+FreeValue();
+mUnit = eUnit_Auto;
+}
+void
+nsStyleAnimation::Value::SetNoneValue()
+{
+FreeValue();
+mUnit = eUnit_None;
+}
+void
+nsStyleAnimation::Value::SetIntValue(int32_t aInt, Unit aUnit)
+{
+NS_ASSERTION(IsIntUnit(aUnit), "unit must be of integer type");
+FreeValue();
+mUnit = aUnit;
+mValue.mInt = aInt;
+}
+void
+nsStyleAnimation::Value::SetCoordValue(nscoord aLength)
+{
+FreeValue();
+mUnit = eUnit_Coord;
+mValue.mCoord = aLength;
+}
+void
+nsStyleAnimation::Value::SetPercentValue(float aPercent)
+{
+FreeValue();
+mUnit = eUnit_Percent;
+mValue.mFloat = aPercent;
+MOZ_ASSERT(!mozilla::IsNaN(mValue.mFloat));
+}
+void
+nsStyleAnimation::Value::SetFloatValue(float aFloat)
+{
+FreeValue();
+mUnit = eUnit_Float;
+mValue.mFloat = aFloat;
+MOZ_ASSERT(!mozilla::IsNaN(mValue.mFloat));
+}
+void
+nsStyleAnimation::Value::SetColorValue(nscolor aColor)
+{
+FreeValue();
+mUnit = eUnit_Color;
+mValue.mColor = aColor;
+}
+void
+nsStyleAnimation::Value::SetUnparsedStringValue(const nsString& aString)
+{
+FreeValue();
+mUnit = eUnit_UnparsedString;
+mValue.mString = nsCSSValue::BufferFromString(aString).take();
+}
+void
+nsStyleAnimation::Value::SetAndAdoptCSSValueValue(nsCSSValue *aValue,
+Unit aUnit)
+{
+FreeValue();
+NS_ABORT_IF_FALSE(IsCSSValueUnit(aUnit), "bad unit");
+NS_ABORT_IF_FALSE(aValue != nullptr, "values may not be null");
+mUnit = aUnit;
+mValue.mCSSValue = aValue; // take ownership
+}
+void
+nsStyleAnimation::Value::SetAndAdoptCSSValuePairValue(
+nsCSSValuePair *aValuePair, Unit aUnit)
+{
+FreeValue();
+NS_ABORT_IF_FALSE(IsCSSValuePairUnit(aUnit), "bad unit");
+NS_ABORT_IF_FALSE(aValuePair != nullptr, "value pairs may not be null");
+mUnit = aUnit;
+mValue.mCSSValuePair = aValuePair; // take ownership
+}
+void
+nsStyleAnimation::Value::SetAndAdoptCSSValueTripletValue(
+nsCSSValueTriplet *aValueTriplet, Unit aUnit)
+{
+FreeValue();
+NS_ABORT_IF_FALSE(IsCSSValueTripletUnit(aUnit), "bad unit");
+NS_ABORT_IF_FALSE(aValueTriplet != nullptr, "value pairs may not be null");
+mUnit = aUnit;
+mValue.mCSSValueTriplet = aValueTriplet; // take ownership
+}
+void
+nsStyleAnimation::Value::SetAndAdoptCSSRectValue(nsCSSRect *aRect, Unit aUnit)
+{
+FreeValue();
+NS_ABORT_IF_FALSE(IsCSSRectUnit(aUnit), "bad unit");
+NS_ABORT_IF_FALSE(aRect != nullptr, "value pairs may not be null");
+mUnit = aUnit;
+mValue.mCSSRect = aRect; // take ownership
+}
+void
+nsStyleAnimation::Value::SetAndAdoptCSSValueListValue(
+nsCSSValueList *aValueList, Unit aUnit)
+{
+FreeValue();
+NS_ABORT_IF_FALSE(IsCSSValueListUnit(aUnit), "bad unit");
+NS_ABORT_IF_FALSE(aUnit == eUnit_Shadow || aUnit == eUnit_Filter ||
+aValueList != nullptr,
+"value lists other than shadows and filters may not be null");
+mUnit = aUnit;
+mValue.mCSSValueList = aValueList; // take ownership
+}
+void
+nsStyleAnimation::Value::SetTransformValue(nsCSSValueSharedList* aList)
+{
+FreeValue();
+mUnit = eUnit_Transform;
+mValue.mCSSValueSharedList = aList;
+mValue.mCSSValueSharedList->AddRef();
+}
+void
+nsStyleAnimation::Value::SetAndAdoptCSSValuePairListValue(
+nsCSSValuePairList *aValuePairList)
+{
+FreeValue();
+NS_ABORT_IF_FALSE(aValuePairList, "may not be null");
+mUnit = eUnit_CSSValuePairList;
+mValue.mCSSValuePairList = aValuePairList; // take ownership
+}
+void
+nsStyleAnimation::Value::FreeValue()
+{
+if (IsCSSValueUnit(mUnit)) {
+delete mValue.mCSSValue;
+} else if (IsCSSValueListUnit(mUnit)) {
+delete mValue.mCSSValueList;
+} else if (IsCSSValueSharedListValue(mUnit)) {
+mValue.mCSSValueSharedList->Release();
+} else if (IsCSSValuePairUnit(mUnit)) {
+delete mValue.mCSSValuePair;
+} else if (IsCSSValueTripletUnit(mUnit)) {
+delete mValue.mCSSValueTriplet;
+} else if (IsCSSRectUnit(mUnit)) {
+delete mValue.mCSSRect;
+} else if (IsCSSValuePairListUnit(mUnit)) {
+delete mValue.mCSSValuePairList;
+} else if (IsStringUnit(mUnit)) {
+NS_ABORT_IF_FALSE(mValue.mString, "expecting non-null string");
+mValue.mString->Release();
+}
+}
+bool
+nsStyleAnimation::Value::operator==(const Value& aOther) const
+{
+if (mUnit != aOther.mUnit) {
+return false;
+}
+switch (mUnit) {
+case eUnit_Null:
+case eUnit_Normal:
+case eUnit_Auto:
+case eUnit_None:
+return true;
+case eUnit_Enumerated:
+case eUnit_Visibility:
+case eUnit_Integer:
+return mValue.mInt == aOther.mValue.mInt;
+case eUnit_Coord:
+return mValue.mCoord == aOther.mValue.mCoord;
+case eUnit_Percent:
+case eUnit_Float:
+return mValue.mFloat == aOther.mValue.mFloat;
+case eUnit_Color:
+return mValue.mColor == aOther.mValue.mColor;
+case eUnit_Calc:
+return *mValue.mCSSValue == *aOther.mValue.mCSSValue;
+case eUnit_CSSValuePair:
+return *mValue.mCSSValuePair == *aOther.mValue.mCSSValuePair;
+case eUnit_CSSValueTriplet:
+return *mValue.mCSSValueTriplet == *aOther.mValue.mCSSValueTriplet;
+case eUnit_CSSRect:
+return *mValue.mCSSRect == *aOther.mValue.mCSSRect;
+case eUnit_Dasharray:
+case eUnit_Filter:
+case eUnit_Shadow:
+case eUnit_BackgroundPosition:
+return *mValue.mCSSValueList == *aOther.mValue.mCSSValueList;
+case eUnit_Transform:
+return *mValue.mCSSValueSharedList == *aOther.mValue.mCSSValueSharedList;
+case eUnit_CSSValuePairList:
+return *mValue.mCSSValuePairList == *aOther.mValue.mCSSValuePairList;
+case eUnit_UnparsedString:
+return (NS_strcmp(GetStringBufferValue(),
+aOther.GetStringBufferValue()) == 0);
+}
+NS_NOTREACHED("incomplete case");
+return false;
+}

The Tor Browser / file comparison

comparison: layout/style/nsStyleAnimation.cpp

layout/style/nsStyleAnimation.cpp