mirror of
https://github.com/mozilla/gecko-dev.git
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46562ab4f3
As the third step in dividing functionality between AnimationPlayer and Animation this patch moves the mIsFinishedTransition member and related methods from AnimationPlayer to Animation. At the same time we rename SetFinishedTransition to SetIsFinishedTransition.
712 lines
22 KiB
C++
712 lines
22 KiB
C++
/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
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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 "AnimationCommon.h"
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#include "nsTransitionManager.h"
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#include "nsAnimationManager.h"
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#include "ActiveLayerTracker.h"
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#include "gfxPlatform.h"
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#include "nsRuleData.h"
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#include "nsCSSPropertySet.h"
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#include "nsCSSValue.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsStyleContext.h"
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#include "nsIFrame.h"
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#include "nsLayoutUtils.h"
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#include "mozilla/LookAndFeel.h"
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#include "Layers.h"
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#include "FrameLayerBuilder.h"
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#include "nsDisplayList.h"
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#include "mozilla/MemoryReporting.h"
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#include "RestyleManager.h"
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#include "nsStyleSet.h"
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#include "nsStyleChangeList.h"
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using mozilla::layers::Layer;
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using mozilla::dom::AnimationPlayer;
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using mozilla::dom::Animation;
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namespace mozilla {
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/* static */ bool
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IsGeometricProperty(nsCSSProperty aProperty)
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{
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switch (aProperty) {
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case eCSSProperty_bottom:
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case eCSSProperty_height:
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case eCSSProperty_left:
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case eCSSProperty_right:
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case eCSSProperty_top:
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case eCSSProperty_width:
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return true;
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default:
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return false;
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}
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}
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namespace css {
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CommonAnimationManager::CommonAnimationManager(nsPresContext *aPresContext)
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: mPresContext(aPresContext)
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{
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PR_INIT_CLIST(&mElementCollections);
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}
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CommonAnimationManager::~CommonAnimationManager()
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{
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NS_ABORT_IF_FALSE(!mPresContext, "Disconnect should have been called");
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}
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void
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CommonAnimationManager::Disconnect()
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{
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// Content nodes might outlive the transition or animation manager.
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RemoveAllElementCollections();
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mPresContext = nullptr;
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}
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void
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CommonAnimationManager::RemoveAllElementCollections()
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{
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while (!PR_CLIST_IS_EMPTY(&mElementCollections)) {
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AnimationPlayerCollection* head =
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static_cast<AnimationPlayerCollection*>(
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PR_LIST_HEAD(&mElementCollections));
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head->Destroy();
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}
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}
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AnimationPlayerCollection*
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CommonAnimationManager::GetAnimationsForCompositor(nsIContent* aContent,
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nsIAtom* aElementProperty,
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nsCSSProperty aProperty)
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{
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if (!aContent->MayHaveAnimations())
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return nullptr;
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AnimationPlayerCollection* collection =
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static_cast<AnimationPlayerCollection*>(
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aContent->GetProperty(aElementProperty));
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if (!collection ||
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!collection->HasAnimationOfProperty(aProperty) ||
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!collection->CanPerformOnCompositorThread(
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AnimationPlayerCollection::CanAnimate_AllowPartial)) {
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return nullptr;
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}
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// This animation can be done on the compositor.
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// Mark the frame as active, in case we are able to throttle this animation.
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nsIFrame* frame = nsLayoutUtils::GetStyleFrame(collection->mElement);
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if (frame) {
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if (aProperty == eCSSProperty_opacity) {
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ActiveLayerTracker::NotifyAnimated(frame, eCSSProperty_opacity);
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} else if (aProperty == eCSSProperty_transform) {
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ActiveLayerTracker::NotifyAnimated(frame, eCSSProperty_transform);
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}
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}
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return collection;
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}
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/*
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* nsISupports implementation
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*/
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NS_IMPL_ISUPPORTS(CommonAnimationManager, nsIStyleRuleProcessor)
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nsRestyleHint
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CommonAnimationManager::HasStateDependentStyle(StateRuleProcessorData* aData)
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{
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return nsRestyleHint(0);
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}
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nsRestyleHint
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CommonAnimationManager::HasStateDependentStyle(PseudoElementStateRuleProcessorData* aData)
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{
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return nsRestyleHint(0);
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}
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bool
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CommonAnimationManager::HasDocumentStateDependentStyle(StateRuleProcessorData* aData)
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{
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return false;
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}
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nsRestyleHint
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CommonAnimationManager::HasAttributeDependentStyle(AttributeRuleProcessorData* aData)
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{
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return nsRestyleHint(0);
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}
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/* virtual */ bool
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CommonAnimationManager::MediumFeaturesChanged(nsPresContext* aPresContext)
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{
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return false;
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}
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/* virtual */ size_t
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CommonAnimationManager::SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
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{
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// Measurement of the following members may be added later if DMD finds it is
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// worthwhile:
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// - mElementCollections
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//
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// The following members are not measured
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// - mPresContext, because it's non-owning
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return 0;
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}
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/* virtual */ size_t
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CommonAnimationManager::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
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{
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return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
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}
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void
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CommonAnimationManager::AddStyleUpdatesTo(RestyleTracker& aTracker)
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{
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PRCList* next = PR_LIST_HEAD(&mElementCollections);
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while (next != &mElementCollections) {
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AnimationPlayerCollection* collection =
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static_cast<AnimationPlayerCollection*>(next);
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next = PR_NEXT_LINK(next);
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if (!collection->IsForElement()) {
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// We don't support compositor-driven animation of :before/:after
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// transitions or animations, so at least skip those.
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// FIXME: We'll need to handle this before using this for the
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// transitions redesign.
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continue;
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}
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nsRestyleHint rshint = collection->IsForTransitions()
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? eRestyle_CSSTransitions : eRestyle_CSSAnimations;
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aTracker.AddPendingRestyle(collection->mElement, rshint, nsChangeHint(0));
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}
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}
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/* static */ bool
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CommonAnimationManager::ExtractComputedValueForTransition(
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nsCSSProperty aProperty,
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nsStyleContext* aStyleContext,
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StyleAnimationValue& aComputedValue)
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{
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bool result = StyleAnimationValue::ExtractComputedValue(aProperty,
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aStyleContext,
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aComputedValue);
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if (aProperty == eCSSProperty_visibility) {
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NS_ABORT_IF_FALSE(aComputedValue.GetUnit() ==
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StyleAnimationValue::eUnit_Enumerated,
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"unexpected unit");
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aComputedValue.SetIntValue(aComputedValue.GetIntValue(),
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StyleAnimationValue::eUnit_Visibility);
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}
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return result;
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}
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NS_IMPL_ISUPPORTS(AnimValuesStyleRule, nsIStyleRule)
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/* virtual */ void
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AnimValuesStyleRule::MapRuleInfoInto(nsRuleData* aRuleData)
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{
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nsStyleContext *contextParent = aRuleData->mStyleContext->GetParent();
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if (contextParent && contextParent->HasPseudoElementData()) {
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// Don't apply transitions or animations to things inside of
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// pseudo-elements.
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// FIXME (Bug 522599): Add tests for this.
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return;
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}
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for (uint32_t i = 0, i_end = mPropertyValuePairs.Length(); i < i_end; ++i) {
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PropertyValuePair &cv = mPropertyValuePairs[i];
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if (aRuleData->mSIDs & nsCachedStyleData::GetBitForSID(
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nsCSSProps::kSIDTable[cv.mProperty]))
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{
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nsCSSValue *prop = aRuleData->ValueFor(cv.mProperty);
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if (prop->GetUnit() == eCSSUnit_Null) {
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#ifdef DEBUG
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bool ok =
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#endif
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StyleAnimationValue::UncomputeValue(cv.mProperty, cv.mValue, *prop);
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NS_ABORT_IF_FALSE(ok, "could not store computed value");
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}
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}
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}
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}
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#ifdef DEBUG
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/* virtual */ void
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AnimValuesStyleRule::List(FILE* out, int32_t aIndent) const
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{
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for (int32_t index = aIndent; --index >= 0; ) fputs(" ", out);
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fputs("[anim values] { ", out);
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for (uint32_t i = 0, i_end = mPropertyValuePairs.Length(); i < i_end; ++i) {
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const PropertyValuePair &pair = mPropertyValuePairs[i];
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nsAutoString value;
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StyleAnimationValue::UncomputeValue(pair.mProperty, pair.mValue, value);
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fprintf(out, "%s: %s; ", nsCSSProps::GetStringValue(pair.mProperty).get(),
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NS_ConvertUTF16toUTF8(value).get());
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}
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fputs("}\n", out);
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}
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#endif
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} /* end sub-namespace css */
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bool
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AnimationPlayerCollection::CanAnimatePropertyOnCompositor(
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const dom::Element *aElement,
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nsCSSProperty aProperty,
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CanAnimateFlags aFlags)
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{
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bool shouldLog = nsLayoutUtils::IsAnimationLoggingEnabled();
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if (!gfxPlatform::OffMainThreadCompositingEnabled()) {
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if (shouldLog) {
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nsCString message;
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message.AppendLiteral("Performance warning: Compositor disabled");
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LogAsyncAnimationFailure(message);
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}
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return false;
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}
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nsIFrame* frame = nsLayoutUtils::GetStyleFrame(aElement);
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if (IsGeometricProperty(aProperty)) {
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if (shouldLog) {
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nsCString message;
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message.AppendLiteral("Performance warning: Async animation of geometric property '");
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message.Append(nsCSSProps::GetStringValue(aProperty));
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message.AppendLiteral("' is disabled");
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LogAsyncAnimationFailure(message, aElement);
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}
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return false;
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}
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if (aProperty == eCSSProperty_transform) {
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if (frame->Preserves3D() &&
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frame->Preserves3DChildren()) {
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if (shouldLog) {
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nsCString message;
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message.AppendLiteral("Gecko bug: Async animation of 'preserve-3d' transforms is not supported. See bug 779598");
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LogAsyncAnimationFailure(message, aElement);
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}
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return false;
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}
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if (frame->IsSVGTransformed()) {
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if (shouldLog) {
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nsCString message;
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message.AppendLiteral("Gecko bug: Async 'transform' animations of frames with SVG transforms is not supported. See bug 779599");
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LogAsyncAnimationFailure(message, aElement);
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}
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return false;
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}
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if (aFlags & CanAnimate_HasGeometricProperty) {
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if (shouldLog) {
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nsCString message;
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message.AppendLiteral("Performance warning: Async animation of 'transform' not possible due to presence of geometric properties");
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LogAsyncAnimationFailure(message, aElement);
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}
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return false;
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}
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}
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bool enabled = nsLayoutUtils::AreAsyncAnimationsEnabled();
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if (!enabled && shouldLog) {
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nsCString message;
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message.AppendLiteral("Performance warning: Async animations are disabled");
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LogAsyncAnimationFailure(message);
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}
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bool propertyAllowed = (aProperty == eCSSProperty_transform) ||
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(aProperty == eCSSProperty_opacity) ||
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(aFlags & CanAnimate_AllowPartial);
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return enabled && propertyAllowed;
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}
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/* static */ bool
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AnimationPlayerCollection::IsCompositorAnimationDisabledForFrame(
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nsIFrame* aFrame)
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{
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void* prop = aFrame->Properties().Get(nsIFrame::RefusedAsyncAnimation());
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return bool(reinterpret_cast<intptr_t>(prop));
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}
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bool
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AnimationPlayerCollection::CanPerformOnCompositorThread(
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CanAnimateFlags aFlags) const
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{
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nsIFrame* frame = nsLayoutUtils::GetStyleFrame(mElement);
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if (!frame) {
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return false;
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}
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if (mElementProperty != nsGkAtoms::transitionsProperty &&
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mElementProperty != nsGkAtoms::animationsProperty) {
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if (nsLayoutUtils::IsAnimationLoggingEnabled()) {
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nsCString message;
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message.AppendLiteral("Gecko bug: Async animation of pseudoelements"
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" not supported. See bug 771367 (");
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message.Append(nsAtomCString(mElementProperty));
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message.Append(")");
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LogAsyncAnimationFailure(message, mElement);
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}
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return false;
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}
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for (size_t playerIdx = mPlayers.Length(); playerIdx-- != 0; ) {
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const AnimationPlayer* player = mPlayers[playerIdx];
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if (!player->IsRunning() || !player->GetSource()) {
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continue;
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}
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const Animation* anim = player->GetSource();
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for (size_t propIdx = 0, propEnd = anim->Properties().Length();
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propIdx != propEnd; ++propIdx) {
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if (IsGeometricProperty(anim->Properties()[propIdx].mProperty)) {
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aFlags = CanAnimateFlags(aFlags | CanAnimate_HasGeometricProperty);
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break;
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}
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}
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}
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bool existsProperty = false;
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for (size_t playerIdx = mPlayers.Length(); playerIdx-- != 0; ) {
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const AnimationPlayer* player = mPlayers[playerIdx];
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if (!player->IsRunning() || !player->GetSource()) {
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continue;
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}
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const Animation* anim = player->GetSource();
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existsProperty = existsProperty || anim->Properties().Length() > 0;
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for (size_t propIdx = 0, propEnd = anim->Properties().Length();
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propIdx != propEnd; ++propIdx) {
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const AnimationProperty& prop = anim->Properties()[propIdx];
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if (!CanAnimatePropertyOnCompositor(mElement,
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prop.mProperty,
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aFlags) ||
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IsCompositorAnimationDisabledForFrame(frame)) {
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return false;
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}
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}
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}
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// No properties to animate
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if (!existsProperty) {
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return false;
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}
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return true;
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}
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bool
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AnimationPlayerCollection::HasAnimationOfProperty(
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nsCSSProperty aProperty) const
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{
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for (size_t playerIdx = mPlayers.Length(); playerIdx-- != 0; ) {
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const Animation* anim = mPlayers[playerIdx]->GetSource();
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if (anim && anim->HasAnimationOfProperty(aProperty) &&
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!anim->IsFinishedTransition()) {
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return true;
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}
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}
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return false;
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}
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/* static */ void
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AnimationPlayerCollection::LogAsyncAnimationFailure(nsCString& aMessage,
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const nsIContent* aContent)
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{
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if (aContent) {
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aMessage.AppendLiteral(" [");
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aMessage.Append(nsAtomCString(aContent->Tag()));
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nsIAtom* id = aContent->GetID();
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if (id) {
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aMessage.AppendLiteral(" with id '");
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aMessage.Append(nsAtomCString(aContent->GetID()));
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aMessage.Append('\'');
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}
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aMessage.Append(']');
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}
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aMessage.Append('\n');
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printf_stderr(aMessage.get());
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}
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/*static*/ void
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AnimationPlayerCollection::PropertyDtor(void *aObject, nsIAtom *aPropertyName,
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void *aPropertyValue, void *aData)
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{
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AnimationPlayerCollection* collection =
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static_cast<AnimationPlayerCollection*>(aPropertyValue);
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#ifdef DEBUG
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NS_ABORT_IF_FALSE(!collection->mCalledPropertyDtor, "can't call dtor twice");
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collection->mCalledPropertyDtor = true;
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#endif
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delete collection;
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}
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void
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AnimationPlayerCollection::Tick()
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{
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for (size_t playerIdx = 0, playerEnd = mPlayers.Length();
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playerIdx != playerEnd; playerIdx++) {
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mPlayers[playerIdx]->Tick();
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}
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}
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void
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AnimationPlayerCollection::EnsureStyleRuleFor(TimeStamp aRefreshTime,
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EnsureStyleRuleFlags aFlags)
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{
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if (!mNeedsRefreshes) {
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mStyleRuleRefreshTime = aRefreshTime;
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return;
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}
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// If we're performing animations on the compositor thread, then we can skip
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// most of the work in this method. But even if we are throttled, then we
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// have to do the work if an animation is ending in order to get correct end
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// of animation behaviour (the styles of the animation disappear, or the fill
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// mode behaviour). This loop checks for any finishing animations and forces
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// the style recalculation if we find any.
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if (aFlags == EnsureStyleRule_IsThrottled) {
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for (size_t playerIdx = mPlayers.Length(); playerIdx-- != 0; ) {
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AnimationPlayer* player = mPlayers[playerIdx];
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// Skip player with no source content, finished transitions, or animations
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// whose @keyframes rule is empty.
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if (!player->GetSource() ||
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player->GetSource()->IsFinishedTransition() ||
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player->GetSource()->Properties().IsEmpty()) {
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continue;
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}
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// The GetComputedTiming() call here handles pausing. But:
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// FIXME: avoid recalculating every time when paused.
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ComputedTiming computedTiming = player->GetSource()->GetComputedTiming();
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// XXX We shouldn't really be using mLastNotification as a general
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// indicator that the animation has finished, it should be reserved for
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// events. If we use it differently in the future this use might need
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// changing.
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if (!player->mIsRunningOnCompositor ||
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(computedTiming.mPhase == ComputedTiming::AnimationPhase_After &&
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player->mLastNotification != AnimationPlayer::LAST_NOTIFICATION_END))
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{
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aFlags = EnsureStyleRule_IsNotThrottled;
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break;
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}
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}
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}
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if (aFlags == EnsureStyleRule_IsThrottled) {
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return;
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}
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// mStyleRule may be null and valid, if we have no style to apply.
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if (mStyleRuleRefreshTime.IsNull() ||
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mStyleRuleRefreshTime != aRefreshTime) {
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mStyleRuleRefreshTime = aRefreshTime;
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mStyleRule = nullptr;
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// We'll set mNeedsRefreshes to true below in all cases where we need them.
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mNeedsRefreshes = false;
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// FIXME(spec): assume that properties in higher animations override
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// those in lower ones.
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// Therefore, we iterate from last animation to first.
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nsCSSPropertySet properties;
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for (size_t playerIdx = mPlayers.Length(); playerIdx-- != 0; ) {
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AnimationPlayer* player = mPlayers[playerIdx];
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if (!player->GetSource() || player->GetSource()->IsFinishedTransition()) {
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continue;
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}
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// The GetComputedTiming() call here handles pausing. But:
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// FIXME: avoid recalculating every time when paused.
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ComputedTiming computedTiming = player->GetSource()->GetComputedTiming();
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|
|
|
if ((computedTiming.mPhase == ComputedTiming::AnimationPhase_Before ||
|
|
computedTiming.mPhase == ComputedTiming::AnimationPhase_Active) &&
|
|
!player->IsPaused()) {
|
|
mNeedsRefreshes = true;
|
|
}
|
|
|
|
// If the time fraction is null, we don't have fill data for the current
|
|
// time so we shouldn't animate.
|
|
// Likewise, if the player has no source content.
|
|
if (computedTiming.mTimeFraction == ComputedTiming::kNullTimeFraction) {
|
|
continue;
|
|
}
|
|
|
|
NS_ABORT_IF_FALSE(0.0 <= computedTiming.mTimeFraction &&
|
|
computedTiming.mTimeFraction <= 1.0,
|
|
"timing fraction should be in [0-1]");
|
|
|
|
const Animation* anim = player->GetSource();
|
|
for (size_t propIdx = 0, propEnd = anim->Properties().Length();
|
|
propIdx != propEnd; ++propIdx)
|
|
{
|
|
const AnimationProperty& prop = anim->Properties()[propIdx];
|
|
|
|
NS_ABORT_IF_FALSE(prop.mSegments[0].mFromKey == 0.0,
|
|
"incorrect first from key");
|
|
NS_ABORT_IF_FALSE(prop.mSegments[prop.mSegments.Length() - 1].mToKey
|
|
== 1.0,
|
|
"incorrect last to key");
|
|
|
|
if (properties.HasProperty(prop.mProperty)) {
|
|
// A later animation already set this property.
|
|
continue;
|
|
}
|
|
properties.AddProperty(prop.mProperty);
|
|
|
|
NS_ABORT_IF_FALSE(prop.mSegments.Length() > 0,
|
|
"property should not be in animations if it "
|
|
"has no segments");
|
|
|
|
// FIXME: Maybe cache the current segment?
|
|
const AnimationPropertySegment *segment = prop.mSegments.Elements(),
|
|
*segmentEnd = segment + prop.mSegments.Length();
|
|
while (segment->mToKey < computedTiming.mTimeFraction) {
|
|
NS_ABORT_IF_FALSE(segment->mFromKey < segment->mToKey,
|
|
"incorrect keys");
|
|
++segment;
|
|
if (segment == segmentEnd) {
|
|
NS_ABORT_IF_FALSE(false, "incorrect time fraction");
|
|
break; // in order to continue in outer loop (just below)
|
|
}
|
|
NS_ABORT_IF_FALSE(segment->mFromKey == (segment-1)->mToKey,
|
|
"incorrect keys");
|
|
}
|
|
if (segment == segmentEnd) {
|
|
continue;
|
|
}
|
|
NS_ABORT_IF_FALSE(segment->mFromKey < segment->mToKey,
|
|
"incorrect keys");
|
|
NS_ABORT_IF_FALSE(segment >= prop.mSegments.Elements() &&
|
|
size_t(segment - prop.mSegments.Elements()) <
|
|
prop.mSegments.Length(),
|
|
"out of array bounds");
|
|
|
|
if (!mStyleRule) {
|
|
// Allocate the style rule now that we know we have animation data.
|
|
mStyleRule = new css::AnimValuesStyleRule();
|
|
}
|
|
|
|
double positionInSegment =
|
|
(computedTiming.mTimeFraction - segment->mFromKey) /
|
|
(segment->mToKey - segment->mFromKey);
|
|
double valuePosition =
|
|
segment->mTimingFunction.GetValue(positionInSegment);
|
|
|
|
StyleAnimationValue *val =
|
|
mStyleRule->AddEmptyValue(prop.mProperty);
|
|
|
|
#ifdef DEBUG
|
|
bool result =
|
|
#endif
|
|
StyleAnimationValue::Interpolate(prop.mProperty,
|
|
segment->mFromValue,
|
|
segment->mToValue,
|
|
valuePosition, *val);
|
|
NS_ABORT_IF_FALSE(result, "interpolate must succeed now");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
bool
|
|
AnimationPlayerCollection::CanThrottleTransformChanges(TimeStamp aTime)
|
|
{
|
|
if (!nsLayoutUtils::AreAsyncAnimationsEnabled()) {
|
|
return false;
|
|
}
|
|
|
|
// If we know that the animation cannot cause overflow,
|
|
// we can just disable flushes for this animation.
|
|
|
|
// If we don't show scrollbars, we don't care about overflow.
|
|
if (LookAndFeel::GetInt(LookAndFeel::eIntID_ShowHideScrollbars) == 0) {
|
|
return true;
|
|
}
|
|
|
|
// If this animation can cause overflow, we can throttle some of the ticks.
|
|
if ((aTime - mStyleRuleRefreshTime) < TimeDuration::FromMilliseconds(200)) {
|
|
return true;
|
|
}
|
|
|
|
// If the nearest scrollable ancestor has overflow:hidden,
|
|
// we don't care about overflow.
|
|
nsIScrollableFrame* scrollable = nsLayoutUtils::GetNearestScrollableFrame(
|
|
nsLayoutUtils::GetStyleFrame(mElement));
|
|
if (!scrollable) {
|
|
return true;
|
|
}
|
|
|
|
ScrollbarStyles ss = scrollable->GetScrollbarStyles();
|
|
if (ss.mVertical == NS_STYLE_OVERFLOW_HIDDEN &&
|
|
ss.mHorizontal == NS_STYLE_OVERFLOW_HIDDEN &&
|
|
scrollable->GetLogicalScrollPosition() == nsPoint(0, 0)) {
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
AnimationPlayerCollection::CanThrottleAnimation(TimeStamp aTime)
|
|
{
|
|
nsIFrame* frame = nsLayoutUtils::GetStyleFrame(mElement);
|
|
if (!frame) {
|
|
return false;
|
|
}
|
|
|
|
bool hasTransform = HasAnimationOfProperty(eCSSProperty_transform);
|
|
bool hasOpacity = HasAnimationOfProperty(eCSSProperty_opacity);
|
|
if (hasOpacity) {
|
|
Layer* layer = FrameLayerBuilder::GetDedicatedLayer(
|
|
frame, nsDisplayItem::TYPE_OPACITY);
|
|
if (!layer || mAnimationGeneration > layer->GetAnimationGeneration()) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (!hasTransform) {
|
|
return true;
|
|
}
|
|
|
|
Layer* layer = FrameLayerBuilder::GetDedicatedLayer(
|
|
frame, nsDisplayItem::TYPE_TRANSFORM);
|
|
if (!layer || mAnimationGeneration > layer->GetAnimationGeneration()) {
|
|
return false;
|
|
}
|
|
|
|
return CanThrottleTransformChanges(aTime);
|
|
}
|
|
|
|
void
|
|
AnimationPlayerCollection::UpdateAnimationGeneration(
|
|
nsPresContext* aPresContext)
|
|
{
|
|
mAnimationGeneration =
|
|
aPresContext->RestyleManager()->GetAnimationGeneration();
|
|
}
|
|
|
|
bool
|
|
AnimationPlayerCollection::HasCurrentAnimations()
|
|
{
|
|
for (size_t playerIdx = mPlayers.Length(); playerIdx-- != 0; ) {
|
|
if (mPlayers[playerIdx]->IsCurrent()) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
}
|