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315 lines
10 KiB
C++
315 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsSVGAnimatedTransformList.h"
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#include "mozilla/dom/SVGAnimatedTransformList.h"
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#include "mozilla/dom/SVGAnimationElement.h"
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#include "nsCharSeparatedTokenizer.h"
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#include "nsSVGTransform.h"
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#include "nsSMILValue.h"
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#include "SVGContentUtils.h"
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#include "SVGTransformListSMILType.h"
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#include "nsIDOMMutationEvent.h"
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namespace mozilla {
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using namespace dom;
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nsresult
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nsSVGAnimatedTransformList::SetBaseValueString(const nsAString& aValue)
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{
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SVGTransformList newBaseValue;
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nsresult rv = newBaseValue.SetValueFromString(aValue);
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if (NS_FAILED(rv)) {
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return rv;
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}
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return SetBaseValue(newBaseValue);
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}
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nsresult
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nsSVGAnimatedTransformList::SetBaseValue(const SVGTransformList& aValue)
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{
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SVGAnimatedTransformList *domWrapper =
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SVGAnimatedTransformList::GetDOMWrapperIfExists(this);
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if (domWrapper) {
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// We must send this notification *before* changing mBaseVal! If the length
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// of our baseVal is being reduced, our baseVal's DOM wrapper list may have
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// to remove DOM items from itself, and any removed DOM items need to copy
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// their internal counterpart values *before* we change them.
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//
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domWrapper->InternalBaseValListWillChangeLengthTo(aValue.Length());
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}
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// We don't need to call DidChange* here - we're only called by
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// nsSVGElement::ParseAttribute under Element::SetAttr,
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// which takes care of notifying.
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nsresult rv = mBaseVal.CopyFrom(aValue);
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if (NS_FAILED(rv) && domWrapper) {
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// Attempting to increase mBaseVal's length failed - reduce domWrapper
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// back to the same length:
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domWrapper->InternalBaseValListWillChangeLengthTo(mBaseVal.Length());
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} else {
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mIsAttrSet = true;
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}
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return rv;
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}
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void
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nsSVGAnimatedTransformList::ClearBaseValue()
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{
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SVGAnimatedTransformList *domWrapper =
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SVGAnimatedTransformList::GetDOMWrapperIfExists(this);
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if (domWrapper) {
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// We must send this notification *before* changing mBaseVal! (See above.)
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domWrapper->InternalBaseValListWillChangeLengthTo(0);
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}
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mBaseVal.Clear();
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mIsAttrSet = false;
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// Caller notifies
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}
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nsresult
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nsSVGAnimatedTransformList::SetAnimValue(const SVGTransformList& aValue,
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nsSVGElement *aElement)
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{
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bool prevSet = HasTransform() || aElement->GetAnimateMotionTransform();
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SVGAnimatedTransformList *domWrapper =
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SVGAnimatedTransformList::GetDOMWrapperIfExists(this);
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if (domWrapper) {
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// A new animation may totally change the number of items in the animVal
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// list, replacing what was essentially a mirror of the baseVal list, or
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// else replacing and overriding an existing animation. When this happens
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// we must try and keep our animVal's DOM wrapper in sync (see the comment
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// in SVGAnimatedTransformList::InternalBaseValListWillChangeLengthTo).
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//
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// It's not possible for us to reliably distinguish between calls to this
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// method that are setting a new sample for an existing animation, and
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// calls that are setting the first sample of an animation that will
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// override an existing animation. Happily it's cheap to just blindly
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// notify our animVal's DOM wrapper of its internal counterpart's new value
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// each time this method is called, so that's what we do.
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//
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// Note that we must send this notification *before* setting or changing
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// mAnimVal! (See the comment in SetBaseValueString above.)
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//
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domWrapper->InternalAnimValListWillChangeLengthTo(aValue.Length());
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}
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if (!mAnimVal) {
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mAnimVal = new SVGTransformList();
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}
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nsresult rv = mAnimVal->CopyFrom(aValue);
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if (NS_FAILED(rv)) {
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// OOM. We clear the animation, and, importantly, ClearAnimValue() ensures
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// that mAnimVal and its DOM wrapper (if any) will have the same length!
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ClearAnimValue(aElement);
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return rv;
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}
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int32_t modType;
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if(prevSet) {
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modType = nsIDOMMutationEvent::MODIFICATION;
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} else {
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modType = nsIDOMMutationEvent::ADDITION;
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}
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aElement->DidAnimateTransformList(modType);
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return NS_OK;
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}
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void
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nsSVGAnimatedTransformList::ClearAnimValue(nsSVGElement *aElement)
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{
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SVGAnimatedTransformList *domWrapper =
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SVGAnimatedTransformList::GetDOMWrapperIfExists(this);
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if (domWrapper) {
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// When all animation ends, animVal simply mirrors baseVal, which may have
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// a different number of items to the last active animated value. We must
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// keep the length of our animVal's DOM wrapper list in sync, and again we
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// must do that before touching mAnimVal. See comments above.
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//
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domWrapper->InternalAnimValListWillChangeLengthTo(mBaseVal.Length());
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}
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mAnimVal = nullptr;
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int32_t modType;
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if (HasTransform() || aElement->GetAnimateMotionTransform()) {
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modType = nsIDOMMutationEvent::MODIFICATION;
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} else {
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modType = nsIDOMMutationEvent::REMOVAL;
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}
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aElement->DidAnimateTransformList(modType);
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}
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bool
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nsSVGAnimatedTransformList::IsExplicitlySet() const
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{
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// Like other methods of this name, we need to know when a transform value has
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// been explicitly set.
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//
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// There are three ways an animated list can become set:
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// 1) Markup -- we set mIsAttrSet to true on any successful call to
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// SetBaseValueString and clear it on ClearBaseValue (as called by
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// nsSVGElement::UnsetAttr or a failed nsSVGElement::ParseAttribute)
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// 2) DOM call -- simply fetching the baseVal doesn't mean the transform value
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// has been set. It is set if that baseVal has one or more transforms in
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// the list.
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// 3) Animation -- which will cause the mAnimVal member to be allocated
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return mIsAttrSet || !mBaseVal.IsEmpty() || mAnimVal;
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}
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nsISMILAttr*
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nsSVGAnimatedTransformList::ToSMILAttr(nsSVGElement* aSVGElement)
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{
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return new SMILAnimatedTransformList(this, aSVGElement);
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}
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nsresult
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nsSVGAnimatedTransformList::SMILAnimatedTransformList::ValueFromString(
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const nsAString& aStr,
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const dom::SVGAnimationElement* aSrcElement,
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nsSMILValue& aValue,
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bool& aPreventCachingOfSandwich) const
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{
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NS_ENSURE_TRUE(aSrcElement, NS_ERROR_FAILURE);
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MOZ_ASSERT(aValue.IsNull(),
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"aValue should have been cleared before calling ValueFromString");
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const nsAttrValue* typeAttr = aSrcElement->GetAnimAttr(nsGkAtoms::type);
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const nsIAtom* transformType = nsGkAtoms::translate; // default val
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if (typeAttr) {
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if (typeAttr->Type() != nsAttrValue::eAtom) {
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// Recognized values of |type| are parsed as an atom -- so if we have
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// something other than an atom, then we know already our |type| is
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// invalid.
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return NS_ERROR_FAILURE;
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}
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transformType = typeAttr->GetAtomValue();
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}
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ParseValue(aStr, transformType, aValue);
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aPreventCachingOfSandwich = false;
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return aValue.IsNull() ? NS_ERROR_FAILURE : NS_OK;
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}
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void
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nsSVGAnimatedTransformList::SMILAnimatedTransformList::ParseValue(
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const nsAString& aSpec,
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const nsIAtom* aTransformType,
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nsSMILValue& aResult)
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{
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MOZ_ASSERT(aResult.IsNull(), "Unexpected type for SMIL value");
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static_assert(SVGTransformSMILData::NUM_SIMPLE_PARAMS == 3,
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"nsSVGSMILTransform constructor should be expecting array "
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"with 3 params");
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float params[3] = { 0.f };
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int32_t numParsed = ParseParameterList(aSpec, params, 3);
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uint16_t transformType;
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if (aTransformType == nsGkAtoms::translate) {
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// tx [ty=0]
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if (numParsed != 1 && numParsed != 2)
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return;
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transformType = SVG_TRANSFORM_TRANSLATE;
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} else if (aTransformType == nsGkAtoms::scale) {
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// sx [sy=sx]
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if (numParsed != 1 && numParsed != 2)
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return;
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if (numParsed == 1) {
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params[1] = params[0];
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}
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transformType = SVG_TRANSFORM_SCALE;
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} else if (aTransformType == nsGkAtoms::rotate) {
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// r [cx=0 cy=0]
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if (numParsed != 1 && numParsed != 3)
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return;
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transformType = SVG_TRANSFORM_ROTATE;
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} else if (aTransformType == nsGkAtoms::skewX) {
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// x-angle
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if (numParsed != 1)
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return;
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transformType = SVG_TRANSFORM_SKEWX;
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} else if (aTransformType == nsGkAtoms::skewY) {
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// y-angle
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if (numParsed != 1)
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return;
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transformType = SVG_TRANSFORM_SKEWY;
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} else {
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return;
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}
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nsSMILValue val(SVGTransformListSMILType::Singleton());
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SVGTransformSMILData transform(transformType, params);
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if (NS_FAILED(SVGTransformListSMILType::AppendTransform(transform, val))) {
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return; // OOM
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}
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// Success! Populate our outparam with parsed value.
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aResult.Swap(val);
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}
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int32_t
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nsSVGAnimatedTransformList::SMILAnimatedTransformList::ParseParameterList(
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const nsAString& aSpec,
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float* aVars,
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int32_t aNVars)
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{
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nsCharSeparatedTokenizerTemplate<IsSVGWhitespace>
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tokenizer(aSpec, ',', nsCharSeparatedTokenizer::SEPARATOR_OPTIONAL);
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int numArgsFound = 0;
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while (tokenizer.hasMoreTokens()) {
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float f;
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if (!SVGContentUtils::ParseNumber(tokenizer.nextToken(), f)) {
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return -1;
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}
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if (numArgsFound < aNVars) {
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aVars[numArgsFound] = f;
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}
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numArgsFound++;
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}
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return numArgsFound;
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}
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nsSMILValue
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nsSVGAnimatedTransformList::SMILAnimatedTransformList::GetBaseValue() const
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{
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// To benefit from Return Value Optimization and avoid copy constructor calls
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// due to our use of return-by-value, we must return the exact same object
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// from ALL return points. This function must only return THIS variable:
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nsSMILValue val(SVGTransformListSMILType::Singleton());
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if (!SVGTransformListSMILType::AppendTransforms(mVal->mBaseVal, val)) {
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val = nsSMILValue();
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}
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return val;
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}
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nsresult
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nsSVGAnimatedTransformList::SMILAnimatedTransformList::SetAnimValue(
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const nsSMILValue& aNewAnimValue)
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{
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MOZ_ASSERT(aNewAnimValue.mType == SVGTransformListSMILType::Singleton(),
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"Unexpected type to assign animated value");
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SVGTransformList animVal;
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if (!SVGTransformListSMILType::GetTransforms(aNewAnimValue,
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animVal.mItems)) {
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return NS_ERROR_FAILURE;
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}
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return mVal->SetAnimValue(animVal, mElement);
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}
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void
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nsSVGAnimatedTransformList::SMILAnimatedTransformList::ClearAnimValue()
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{
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if (mVal->mAnimVal) {
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mVal->ClearAnimValue(mElement);
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}
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}
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} // namespace mozilla
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