gecko-dev/dom/smil/nsSMILCSSValueType.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* representation of a value for a SMIL-animated CSS property */
#include "nsSMILCSSValueType.h"
#include "nsComputedDOMStyle.h"
#include "nsString.h"
#include "nsSMILParserUtils.h"
#include "nsSMILValue.h"
#include "nsCSSProps.h"
#include "nsCSSValue.h"
#include "nsColor.h"
#include "nsPresContext.h"
#include "mozilla/ServoBindings.h"
#include "mozilla/StyleAnimationValue.h" // For AnimationValue
#include "mozilla/ServoCSSParser.h"
#include "mozilla/StyleSetHandleInlines.h"
#include "mozilla/dom/BaseKeyframeTypesBinding.h" // For CompositeOperation
#include "mozilla/dom/Element.h"
#include "nsDebug.h"
#include "nsStyleUtil.h"
#include "nsIDocument.h"
using namespace mozilla;
using namespace mozilla::dom;
using mozilla::StyleAnimationValue;
typedef AutoTArray<RefPtr<RawServoAnimationValue>, 1> ServoAnimationValues;
/*static*/ nsSMILCSSValueType nsSMILCSSValueType::sSingleton;
struct ValueWrapper {
ValueWrapper(nsCSSPropertyID aPropID, const AnimationValue& aValue)
: mPropID(aPropID)
{
if (aValue.mServo) {
mServoValues.AppendElement(aValue.mServo);
return;
}
MOZ_CRASH("old style system disabled");
}
ValueWrapper(nsCSSPropertyID aPropID,
const RefPtr<RawServoAnimationValue>& aValue)
: mPropID(aPropID), mServoValues{(aValue)} {}
ValueWrapper(nsCSSPropertyID aPropID, ServoAnimationValues&& aValues)
: mPropID(aPropID), mServoValues{aValues} {}
bool operator==(const ValueWrapper& aOther) const
{
if (mPropID != aOther.mPropID) {
return false;
}
if (!mServoValues.IsEmpty()) {
size_t len = mServoValues.Length();
if (len != aOther.mServoValues.Length()) {
return false;
}
for (size_t i = 0; i < len; i++) {
if (!Servo_AnimationValue_DeepEqual(mServoValues[i],
aOther.mServoValues[i])) {
return false;
}
}
return true;
}
MOZ_CRASH("old style system disabled");
}
bool operator!=(const ValueWrapper& aOther) const
{
return !(*this == aOther);
}
nsCSSPropertyID mPropID;
ServoAnimationValues mServoValues;
};
// Helper Methods
// --------------
// If one argument is null, this method updates it to point to "zero"
// for the other argument's Unit (if applicable; otherwise, we return false).
//
// If neither argument is null, this method simply returns true.
//
// If both arguments are null, this method returns false.
//
// |aZeroValueStorage| should be a reference to a RefPtr<RawServoAnimationValue>.
// This is used where we may need to allocate a new ServoAnimationValue to
// represent the appropriate zero value.
//
// Returns true on success, or otherwise.
static bool
FinalizeServoAnimationValues(const RefPtr<RawServoAnimationValue>*& aValue1,
const RefPtr<RawServoAnimationValue>*& aValue2,
RefPtr<RawServoAnimationValue>& aZeroValueStorage)
{
if (!aValue1 && !aValue2) {
return false;
}
// Are we missing either val? (If so, it's an implied 0 in other val's units)
if (!aValue1) {
aZeroValueStorage = Servo_AnimationValues_GetZeroValue(*aValue2).Consume();
aValue1 = &aZeroValueStorage;
} else if (!aValue2) {
aZeroValueStorage = Servo_AnimationValues_GetZeroValue(*aValue1).Consume();
aValue2 = &aZeroValueStorage;
}
return *aValue1 && *aValue2;
}
static ValueWrapper*
ExtractValueWrapper(nsSMILValue& aValue)
{
return static_cast<ValueWrapper*>(aValue.mU.mPtr);
}
static const ValueWrapper*
ExtractValueWrapper(const nsSMILValue& aValue)
{
return static_cast<const ValueWrapper*>(aValue.mU.mPtr);
}
// Class methods
// -------------
void
nsSMILCSSValueType::Init(nsSMILValue& aValue) const
{
MOZ_ASSERT(aValue.IsNull(), "Unexpected SMIL value type");
aValue.mU.mPtr = nullptr;
aValue.mType = this;
}
void
nsSMILCSSValueType::Destroy(nsSMILValue& aValue) const
{
MOZ_ASSERT(aValue.mType == this, "Unexpected SMIL value type");
delete static_cast<ValueWrapper*>(aValue.mU.mPtr);
aValue.mType = nsSMILNullType::Singleton();
}
nsresult
nsSMILCSSValueType::Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const
{
MOZ_ASSERT(aDest.mType == aSrc.mType, "Incompatible SMIL types");
MOZ_ASSERT(aDest.mType == this, "Unexpected SMIL value type");
const ValueWrapper* srcWrapper = ExtractValueWrapper(aSrc);
ValueWrapper* destWrapper = ExtractValueWrapper(aDest);
if (srcWrapper) {
if (!destWrapper) {
// barely-initialized dest -- need to alloc & copy
aDest.mU.mPtr = new ValueWrapper(*srcWrapper);
} else {
// both already fully-initialized -- just copy straight across
*destWrapper = *srcWrapper;
}
} else if (destWrapper) {
// fully-initialized dest, barely-initialized src -- clear dest
delete destWrapper;
aDest.mU.mPtr = destWrapper = nullptr;
} // else, both are barely-initialized -- nothing to do.
return NS_OK;
}
bool
nsSMILCSSValueType::IsEqual(const nsSMILValue& aLeft,
const nsSMILValue& aRight) const
{
MOZ_ASSERT(aLeft.mType == aRight.mType, "Incompatible SMIL types");
MOZ_ASSERT(aLeft.mType == this, "Unexpected SMIL value");
const ValueWrapper* leftWrapper = ExtractValueWrapper(aLeft);
const ValueWrapper* rightWrapper = ExtractValueWrapper(aRight);
if (leftWrapper) {
if (rightWrapper) {
// Both non-null
NS_WARNING_ASSERTION(leftWrapper != rightWrapper,
"Two nsSMILValues with matching ValueWrapper ptr");
return *leftWrapper == *rightWrapper;
}
// Left non-null, right null
return false;
}
if (rightWrapper) {
// Left null, right non-null
return false;
}
// Both null
return true;
}
static bool
AddOrAccumulateForServo(nsSMILValue& aDest,
const ValueWrapper* aValueToAddWrapper,
ValueWrapper* aDestWrapper,
CompositeOperation aCompositeOp,
uint64_t aCount)
{
nsCSSPropertyID property = aValueToAddWrapper
? aValueToAddWrapper->mPropID
: aDestWrapper->mPropID;
size_t len = aValueToAddWrapper
? aValueToAddWrapper->mServoValues.Length()
: aDestWrapper->mServoValues.Length();
MOZ_ASSERT(!aValueToAddWrapper || !aDestWrapper ||
aValueToAddWrapper->mServoValues.Length() ==
aDestWrapper->mServoValues.Length(),
"Both of values' length in the wrappers should be the same if "
"both of them exist");
for (size_t i = 0; i < len; i++) {
const RefPtr<RawServoAnimationValue>* valueToAdd =
aValueToAddWrapper
? &aValueToAddWrapper->mServoValues[i]
: nullptr;
const RefPtr<RawServoAnimationValue>* destValue =
aDestWrapper
? &aDestWrapper->mServoValues[i]
: nullptr;
RefPtr<RawServoAnimationValue> zeroValueStorage;
if (!FinalizeServoAnimationValues(valueToAdd, destValue, zeroValueStorage)) {
return false;
}
// FinalizeServoAnimationValues may have updated destValue so we should make
// sure the aDest and aDestWrapper outparams are up-to-date.
if (aDestWrapper) {
aDestWrapper->mServoValues[i] = *destValue;
} else {
// aDest may be a barely-initialized "zero" destination.
aDest.mU.mPtr = aDestWrapper = new ValueWrapper(property, *destValue);
aDestWrapper->mServoValues.SetLength(len);
}
RefPtr<RawServoAnimationValue> result;
if (aCompositeOp == CompositeOperation::Add) {
result = Servo_AnimationValues_Add(*destValue, *valueToAdd).Consume();
} else {
result = Servo_AnimationValues_Accumulate(*destValue,
*valueToAdd,
aCount).Consume();
}
if (!result) {
return false;
}
aDestWrapper->mServoValues[i] = result;
}
return true;
}
static bool
AddOrAccumulate(nsSMILValue& aDest, const nsSMILValue& aValueToAdd,
CompositeOperation aCompositeOp, uint64_t aCount)
{
MOZ_ASSERT(aValueToAdd.mType == aDest.mType,
"Trying to add mismatching types");
MOZ_ASSERT(aValueToAdd.mType == &nsSMILCSSValueType::sSingleton,
"Unexpected SMIL value type");
MOZ_ASSERT(aCompositeOp == CompositeOperation::Add ||
aCompositeOp == CompositeOperation::Accumulate,
"Composite operation should be add or accumulate");
MOZ_ASSERT(aCompositeOp != CompositeOperation::Add || aCount == 1,
"Count should be 1 if composite operation is add");
ValueWrapper* destWrapper = ExtractValueWrapper(aDest);
const ValueWrapper* valueToAddWrapper = ExtractValueWrapper(aValueToAdd);
// If both of the values are empty just fail. This can happen in rare cases
// such as when the underlying animation produced an empty value.
//
// Technically, it doesn't matter what we return here since in either case it
// will produce the same result: an empty value.
if (!destWrapper && !valueToAddWrapper) {
return false;
}
nsCSSPropertyID property = valueToAddWrapper
? valueToAddWrapper->mPropID
: destWrapper->mPropID;
// Special case: font-size-adjust and stroke-dasharray are explicitly
// non-additive (even though StyleAnimationValue *could* support adding them)
if (property == eCSSProperty_font_size_adjust ||
property == eCSSProperty_stroke_dasharray) {
return false;
}
// Skip font shorthand since it includes font-size-adjust.
if (property == eCSSProperty_font) {
return false;
}
bool isServo = valueToAddWrapper
? !valueToAddWrapper->mServoValues.IsEmpty()
: !destWrapper->mServoValues.IsEmpty();
if (isServo) {
return AddOrAccumulateForServo(aDest,
valueToAddWrapper,
destWrapper,
aCompositeOp,
aCount);
}
MOZ_CRASH("old style system disabled");
}
nsresult
nsSMILCSSValueType::SandwichAdd(nsSMILValue& aDest,
const nsSMILValue& aValueToAdd) const
{
return AddOrAccumulate(aDest, aValueToAdd, CompositeOperation::Add, 1)
? NS_OK
: NS_ERROR_FAILURE;
}
nsresult
nsSMILCSSValueType::Add(nsSMILValue& aDest, const nsSMILValue& aValueToAdd,
uint32_t aCount) const
{
return AddOrAccumulate(aDest, aValueToAdd, CompositeOperation::Accumulate,
aCount)
? NS_OK
: NS_ERROR_FAILURE;
}
static nsresult
ComputeDistanceForServo(const ValueWrapper* aFromWrapper,
const ValueWrapper& aToWrapper,
double& aDistance)
{
size_t len = aToWrapper.mServoValues.Length();
MOZ_ASSERT(!aFromWrapper || aFromWrapper->mServoValues.Length() == len,
"From and to values length should be the same if "
"The start value exists");
double squareDistance = 0;
for (size_t i = 0; i < len; i++) {
const RefPtr<RawServoAnimationValue>* fromValue =
aFromWrapper ? &aFromWrapper->mServoValues[0] : nullptr;
const RefPtr<RawServoAnimationValue>* toValue = &aToWrapper.mServoValues[0];
RefPtr<RawServoAnimationValue> zeroValueStorage;
if (!FinalizeServoAnimationValues(fromValue, toValue, zeroValueStorage)) {
return NS_ERROR_FAILURE;
}
double distance = Servo_AnimationValues_ComputeDistance(*fromValue, *toValue);
if (distance < 0.0) {
return NS_ERROR_FAILURE;
}
if (len == 1) {
aDistance = distance;
return NS_OK;
}
squareDistance += distance * distance;
}
aDistance = sqrt(squareDistance);
return NS_OK;
}
nsresult
nsSMILCSSValueType::ComputeDistance(const nsSMILValue& aFrom,
const nsSMILValue& aTo,
double& aDistance) const
{
MOZ_ASSERT(aFrom.mType == aTo.mType,
"Trying to compare different types");
MOZ_ASSERT(aFrom.mType == this, "Unexpected source type");
const ValueWrapper* fromWrapper = ExtractValueWrapper(aFrom);
const ValueWrapper* toWrapper = ExtractValueWrapper(aTo);
MOZ_ASSERT(toWrapper, "expecting non-null endpoint");
if (!toWrapper->mServoValues.IsEmpty()) {
return ComputeDistanceForServo(fromWrapper, *toWrapper, aDistance);
}
MOZ_CRASH("old style system disabled");
}
static nsresult
InterpolateForServo(const ValueWrapper* aStartWrapper,
const ValueWrapper& aEndWrapper,
double aUnitDistance,
nsSMILValue& aResult)
{
// For discretely-animated properties Servo_AnimationValues_Interpolate will
// perform the discrete animation (i.e. 50% flip) and return a success result.
// However, SMIL has its own special discrete animation behavior that it uses
// when keyTimes are specified, but we won't run that unless that this method
// returns a failure to indicate that the property cannot be smoothly
// interpolated, i.e. that we need to use a discrete calcMode.
//
// For shorthands, Servo_Property_IsDiscreteAnimatable will always return
// false. That's fine since most shorthands (like 'font' and
// 'text-decoration') include non-discrete components. If authors want to
// treat all components as discrete then they should use calcMode="discrete".
if (Servo_Property_IsDiscreteAnimatable(aEndWrapper.mPropID)) {
return NS_ERROR_FAILURE;
}
ServoAnimationValues results;
size_t len = aEndWrapper.mServoValues.Length();
results.SetCapacity(len);
MOZ_ASSERT(!aStartWrapper || aStartWrapper->mServoValues.Length() == len,
"Start and end values length should be the same if "
"the start value exists");
for (size_t i = 0; i < len; i++) {
const RefPtr<RawServoAnimationValue>*
startValue = aStartWrapper
? &aStartWrapper->mServoValues[i]
: nullptr;
const RefPtr<RawServoAnimationValue>* endValue = &aEndWrapper.mServoValues[i];
RefPtr<RawServoAnimationValue> zeroValueStorage;
if (!FinalizeServoAnimationValues(startValue, endValue, zeroValueStorage)) {
return NS_ERROR_FAILURE;
}
RefPtr<RawServoAnimationValue> result =
Servo_AnimationValues_Interpolate(*startValue,
*endValue,
aUnitDistance).Consume();
if (!result) {
return NS_ERROR_FAILURE;
}
results.AppendElement(result);
}
aResult.mU.mPtr = new ValueWrapper(aEndWrapper.mPropID, Move(results));
return NS_OK;
}
nsresult
nsSMILCSSValueType::Interpolate(const nsSMILValue& aStartVal,
const nsSMILValue& aEndVal,
double aUnitDistance,
nsSMILValue& aResult) const
{
MOZ_ASSERT(aStartVal.mType == aEndVal.mType,
"Trying to interpolate different types");
MOZ_ASSERT(aStartVal.mType == this,
"Unexpected types for interpolation");
MOZ_ASSERT(aResult.mType == this, "Unexpected result type");
MOZ_ASSERT(aUnitDistance >= 0.0 && aUnitDistance <= 1.0,
"unit distance value out of bounds");
MOZ_ASSERT(!aResult.mU.mPtr, "expecting barely-initialized outparam");
const ValueWrapper* startWrapper = ExtractValueWrapper(aStartVal);
const ValueWrapper* endWrapper = ExtractValueWrapper(aEndVal);
MOZ_ASSERT(endWrapper, "expecting non-null endpoint");
if (!endWrapper->mServoValues.IsEmpty()) {
return InterpolateForServo(startWrapper,
*endWrapper,
aUnitDistance,
aResult);
}
MOZ_CRASH("old style system disabled");
}
// Helper function to extract presContext
static nsPresContext*
GetPresContextForElement(Element* aElem)
{
nsIDocument* doc = aElem->GetUncomposedDoc();
if (!doc) {
// This can happen if we process certain types of restyles mid-sample
// and remove anonymous animated content from the document as a result.
// See bug 534975.
return nullptr;
}
return doc->GetPresContext();
}
static ServoAnimationValues
ValueFromStringHelper(nsCSSPropertyID aPropID,
Element* aTargetElement,
nsPresContext* aPresContext,
ComputedStyle* aComputedStyle,
const nsAString& aString)
{
ServoAnimationValues result;
nsIDocument* doc = aTargetElement->GetUncomposedDoc();
if (!doc) {
return result;
}
// Parse property
ServoCSSParser::ParsingEnvironment env =
ServoCSSParser::GetParsingEnvironment(doc);
RefPtr<RawServoDeclarationBlock> servoDeclarationBlock =
ServoCSSParser::ParseProperty(aPropID, aString, env,
ParsingMode::AllowUnitlessLength |
ParsingMode::AllowAllNumericValues);
if (!servoDeclarationBlock) {
return result;
}
// Compute value
aPresContext->StyleSet()->AsServo()->GetAnimationValues(servoDeclarationBlock,
aTargetElement,
aComputedStyle,
result);
return result;
}
// static
void
nsSMILCSSValueType::ValueFromString(nsCSSPropertyID aPropID,
Element* aTargetElement,
const nsAString& aString,
nsSMILValue& aValue,
bool* aIsContextSensitive)
{
MOZ_ASSERT(aValue.IsNull(), "Outparam should be null-typed");
nsPresContext* presContext = GetPresContextForElement(aTargetElement);
if (!presContext) {
NS_WARNING("Not parsing animation value; unable to get PresContext");
return;
}
nsIDocument* doc = aTargetElement->GetUncomposedDoc();
if (doc && !nsStyleUtil::CSPAllowsInlineStyle(nullptr,
doc->NodePrincipal(),
nullptr,
doc->GetDocumentURI(),
0, aString, nullptr)) {
return;
}
RefPtr<ComputedStyle> computedStyle =
nsComputedDOMStyle::GetComputedStyle(aTargetElement, nullptr);
if (!computedStyle) {
return;
}
ServoAnimationValues parsedValues =
ValueFromStringHelper(aPropID, aTargetElement, presContext,
computedStyle, aString);
if (aIsContextSensitive) {
// FIXME: Bug 1358955 - detect context-sensitive values and set this value
// appropriately.
*aIsContextSensitive = false;
}
if (!parsedValues.IsEmpty()) {
sSingleton.Init(aValue);
aValue.mU.mPtr = new ValueWrapper(aPropID, Move(parsedValues));
}
}
// static
nsSMILValue
nsSMILCSSValueType::ValueFromAnimationValue(nsCSSPropertyID aPropID,
Element* aTargetElement,
const AnimationValue& aValue)
{
nsSMILValue result;
nsIDocument* doc = aTargetElement->GetUncomposedDoc();
// We'd like to avoid serializing |aValue| if possible, and since the
// string passed to CSPAllowsInlineStyle is only used for reporting violations
// and an intermediate CSS value is not likely to be particularly useful
// in that case, we just use a generic placeholder string instead.
static const nsLiteralString kPlaceholderText =
NS_LITERAL_STRING("[SVG animation of CSS]");
if (doc && !nsStyleUtil::CSPAllowsInlineStyle(nullptr,
doc->NodePrincipal(),
nullptr,
doc->GetDocumentURI(),
0, kPlaceholderText, nullptr)) {
return result;
}
sSingleton.Init(result);
result.mU.mPtr = new ValueWrapper(aPropID, aValue);
return result;
}
// static
void
nsSMILCSSValueType::ValueToString(const nsSMILValue& aValue,
nsAString& aString)
{
MOZ_ASSERT(aValue.mType == &nsSMILCSSValueType::sSingleton,
"Unexpected SMIL value type");
const ValueWrapper* wrapper = ExtractValueWrapper(aValue);
if (!wrapper) {
return;
}
if (wrapper->mServoValues.IsEmpty()) {
MOZ_CRASH("old style system disabled");
}
if (nsCSSProps::IsShorthand(wrapper->mPropID)) {
// In case of shorthand on servo, we iterate over all mServoValues array
// since we have multiple AnimationValues in the array for each longhand
// component.
Servo_Shorthand_AnimationValues_Serialize(wrapper->mPropID,
&wrapper->mServoValues,
&aString);
return;
}
Servo_AnimationValue_Serialize(wrapper->mServoValues[0],
wrapper->mPropID,
&aString);
}
// static
nsCSSPropertyID
nsSMILCSSValueType::PropertyFromValue(const nsSMILValue& aValue)
{
if (aValue.mType != &nsSMILCSSValueType::sSingleton) {
return eCSSProperty_UNKNOWN;
}
const ValueWrapper* wrapper = ExtractValueWrapper(aValue);
if (!wrapper) {
return eCSSProperty_UNKNOWN;
}
return wrapper->mPropID;
}
// static
void
nsSMILCSSValueType::FinalizeValue(nsSMILValue& aValue,
const nsSMILValue& aValueToMatch)
{
MOZ_ASSERT(aValue.mType == aValueToMatch.mType, "Incompatible SMIL types");
MOZ_ASSERT(aValue.mType == &nsSMILCSSValueType::sSingleton,
"Unexpected SMIL value type");
ValueWrapper* valueWrapper = ExtractValueWrapper(aValue);
// If |aValue| already has a value, there's nothing to do here.
if (valueWrapper) {
return;
}
const ValueWrapper* valueToMatchWrapper = ExtractValueWrapper(aValueToMatch);
if (!valueToMatchWrapper) {
MOZ_ASSERT_UNREACHABLE("Value to match is empty");
return;
}
bool isServo = !valueToMatchWrapper->mServoValues.IsEmpty();
if (isServo) {
ServoAnimationValues zeroValues;
zeroValues.SetCapacity(valueToMatchWrapper->mServoValues.Length());
for (auto& valueToMatch : valueToMatchWrapper->mServoValues) {
RefPtr<RawServoAnimationValue> zeroValue =
Servo_AnimationValues_GetZeroValue(valueToMatch).Consume();
if (!zeroValue) {
return;
}
zeroValues.AppendElement(Move(zeroValue));
}
aValue.mU.mPtr = new ValueWrapper(valueToMatchWrapper->mPropID,
Move(zeroValues));
} else {
MOZ_CRASH("old style system disabled");
}
}