mirror of
https://github.com/classilla/tenfourfox.git
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533 lines
18 KiB
C++
533 lines
18 KiB
C++
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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 "ActiveLayerTracker.h"
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#include "mozilla/ArrayUtils.h"
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#include "mozilla/dom/KeyframeEffect.h"
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#include "mozilla/gfx/Matrix.h"
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#include "mozilla/EffectSet.h"
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#include "mozilla/PodOperations.h"
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#include "nsExpirationTracker.h"
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#include "nsContainerFrame.h"
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#include "nsIContent.h"
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#include "nsRefreshDriver.h"
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#include "nsPIDOMWindow.h"
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#include "nsIDocument.h"
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#include "nsAnimationManager.h"
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#include "nsStyleTransformMatrix.h"
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#include "nsTransitionManager.h"
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#include "nsDisplayList.h"
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namespace mozilla {
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using namespace gfx;
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/**
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* This tracks the state of a frame that may need active layers due to
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* ongoing content changes or style changes that indicate animation.
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*
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* When no changes of *any* kind are detected after 75-100ms we remove this
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* object. Because we only track all kinds of activity with a single
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* nsExpirationTracker, it's possible a frame might remain active somewhat
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* spuriously if different kinds of changes kept happening, but that almost
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* certainly doesn't matter.
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*/
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class LayerActivity {
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public:
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enum ActivityIndex {
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ACTIVITY_OPACITY,
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ACTIVITY_TRANSFORM,
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ACTIVITY_LEFT,
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ACTIVITY_TOP,
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ACTIVITY_RIGHT,
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ACTIVITY_BOTTOM,
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ACTIVITY_MARGIN_LEFT,
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ACTIVITY_MARGIN_TOP,
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ACTIVITY_MARGIN_RIGHT,
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ACTIVITY_MARGIN_BOTTOM,
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ACTIVITY_BACKGROUND_POSITION,
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ACTIVITY_SCALE,
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// keep as last item
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ACTIVITY_COUNT
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};
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explicit LayerActivity(nsIFrame* aFrame)
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: mFrame(aFrame)
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, mContent(nullptr)
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, mContentActive(false)
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{
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PodArrayZero(mRestyleCounts);
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}
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~LayerActivity();
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nsExpirationState* GetExpirationState() { return &mState; }
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uint8_t& RestyleCountForProperty(nsCSSProperty aProperty)
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{
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return mRestyleCounts[GetActivityIndexForProperty(aProperty)];
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}
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static ActivityIndex GetActivityIndexForProperty(nsCSSProperty aProperty)
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{
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switch (aProperty) {
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case eCSSProperty_opacity: return ACTIVITY_OPACITY;
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case eCSSProperty_transform: return ACTIVITY_TRANSFORM;
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case eCSSProperty_left: return ACTIVITY_LEFT;
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case eCSSProperty_top: return ACTIVITY_TOP;
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case eCSSProperty_right: return ACTIVITY_RIGHT;
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case eCSSProperty_bottom: return ACTIVITY_BOTTOM;
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case eCSSProperty_margin_left: return ACTIVITY_MARGIN_LEFT;
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case eCSSProperty_margin_top: return ACTIVITY_MARGIN_TOP;
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case eCSSProperty_margin_right: return ACTIVITY_MARGIN_RIGHT;
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case eCSSProperty_margin_bottom: return ACTIVITY_MARGIN_BOTTOM;
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case eCSSProperty_background_position: return ACTIVITY_BACKGROUND_POSITION;
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default: MOZ_ASSERT(false); return ACTIVITY_OPACITY;
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}
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}
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// While tracked, exactly one of mFrame or mContent is non-null, depending
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// on whether this property is stored on a frame or on a content node.
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// When this property is expired by the layer activity tracker, both mFrame
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// and mContent are nulled-out and the property is deleted.
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nsIFrame* mFrame;
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nsIContent* mContent;
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nsExpirationState mState;
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// Previous scale due to the CSS transform property.
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Maybe<gfxSize> mPreviousTransformScale;
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// The scroll frame during for which we most recently received a call to
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// NotifyAnimatedFromScrollHandler.
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nsWeakFrame mAnimatingScrollHandlerFrame;
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// The set of activities that were triggered during
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// mAnimatingScrollHandlerFrame's scroll event handler.
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EnumSet<ActivityIndex> mScrollHandlerInducedActivity;
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// Number of restyle operations detected
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uint8_t mRestyleCounts[ACTIVITY_COUNT];
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bool mContentActive;
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};
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class LayerActivityTracker final : public nsExpirationTracker<LayerActivity,4> {
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public:
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// 75-100ms is a good timeout period. We use 4 generations of 25ms each.
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enum { GENERATION_MS = 100 };
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LayerActivityTracker()
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: nsExpirationTracker<LayerActivity,4>(GENERATION_MS,
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"LayerActivityTracker")
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, mDestroying(false)
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{}
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~LayerActivityTracker() {
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mDestroying = true;
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AgeAllGenerations();
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}
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virtual void NotifyExpired(LayerActivity* aObject);
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public:
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nsWeakFrame mCurrentScrollHandlerFrame;
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private:
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bool mDestroying;
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};
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static LayerActivityTracker* gLayerActivityTracker = nullptr;
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LayerActivity::~LayerActivity()
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{
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if (mFrame || mContent) {
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NS_ASSERTION(gLayerActivityTracker, "Should still have a tracker");
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gLayerActivityTracker->RemoveObject(this);
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}
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}
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// Frames with this property have NS_FRAME_HAS_LAYER_ACTIVITY_PROPERTY set
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NS_DECLARE_FRAME_PROPERTY(LayerActivityProperty, DeleteValue<LayerActivity>)
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void
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LayerActivityTracker::NotifyExpired(LayerActivity* aObject)
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{
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if (!mDestroying && aObject->mAnimatingScrollHandlerFrame.IsAlive()) {
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// Reset the restyle counts, but let the layer activity survive.
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PodArrayZero(aObject->mRestyleCounts);
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MarkUsed(aObject);
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return;
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}
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RemoveObject(aObject);
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nsIFrame* f = aObject->mFrame;
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nsIContent* c = aObject->mContent;
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aObject->mFrame = nullptr;
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aObject->mContent = nullptr;
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MOZ_ASSERT((f == nullptr) != (c == nullptr),
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"A LayerActivity object should always have a reference to either its frame or its content");
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if (f) {
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// The pres context might have been detached during the delay -
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// that's fine, just skip the paint.
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if (f->PresContext()->GetContainerWeak()) {
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f->SchedulePaint();
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}
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f->RemoveStateBits(NS_FRAME_HAS_LAYER_ACTIVITY_PROPERTY);
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f->Properties().Delete(LayerActivityProperty());
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} else {
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c->DeleteProperty(nsGkAtoms::LayerActivity);
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}
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}
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static LayerActivity*
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GetLayerActivity(nsIFrame* aFrame)
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{
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if (!aFrame->HasAnyStateBits(NS_FRAME_HAS_LAYER_ACTIVITY_PROPERTY)) {
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return nullptr;
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}
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FrameProperties properties = aFrame->Properties();
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return static_cast<LayerActivity*>(properties.Get(LayerActivityProperty()));
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}
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static LayerActivity*
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GetLayerActivityForUpdate(nsIFrame* aFrame)
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{
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FrameProperties properties = aFrame->Properties();
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LayerActivity* layerActivity =
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static_cast<LayerActivity*>(properties.Get(LayerActivityProperty()));
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if (layerActivity) {
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gLayerActivityTracker->MarkUsed(layerActivity);
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} else {
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if (!gLayerActivityTracker) {
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gLayerActivityTracker = new LayerActivityTracker();
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}
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layerActivity = new LayerActivity(aFrame);
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gLayerActivityTracker->AddObject(layerActivity);
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aFrame->AddStateBits(NS_FRAME_HAS_LAYER_ACTIVITY_PROPERTY);
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properties.Set(LayerActivityProperty(), layerActivity);
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}
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return layerActivity;
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}
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static void
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IncrementMutationCount(uint8_t* aCount)
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{
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*aCount = uint8_t(std::min(0xFF, *aCount + 1));
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}
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/* static */ void
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ActiveLayerTracker::TransferActivityToContent(nsIFrame* aFrame, nsIContent* aContent)
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{
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if (!aFrame->HasAnyStateBits(NS_FRAME_HAS_LAYER_ACTIVITY_PROPERTY)) {
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return;
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}
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FrameProperties properties = aFrame->Properties();
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LayerActivity* layerActivity =
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static_cast<LayerActivity*>(properties.Remove(LayerActivityProperty()));
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aFrame->RemoveStateBits(NS_FRAME_HAS_LAYER_ACTIVITY_PROPERTY);
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if (!layerActivity) {
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return;
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}
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layerActivity->mFrame = nullptr;
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layerActivity->mContent = aContent;
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aContent->SetProperty(nsGkAtoms::LayerActivity, layerActivity,
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nsINode::DeleteProperty<LayerActivity>, true);
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}
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/* static */ void
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ActiveLayerTracker::TransferActivityToFrame(nsIContent* aContent, nsIFrame* aFrame)
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{
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LayerActivity* layerActivity = static_cast<LayerActivity*>(
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aContent->UnsetProperty(nsGkAtoms::LayerActivity));
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if (!layerActivity) {
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return;
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}
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layerActivity->mContent = nullptr;
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layerActivity->mFrame = aFrame;
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aFrame->AddStateBits(NS_FRAME_HAS_LAYER_ACTIVITY_PROPERTY);
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aFrame->Properties().Set(LayerActivityProperty(), layerActivity);
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}
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static void
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IncrementScaleRestyleCountIfNeeded(nsIFrame* aFrame, LayerActivity* aActivity)
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{
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const nsStyleDisplay* display = aFrame->StyleDisplay();
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if (!display->mSpecifiedTransform) {
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// The transform was removed.
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aActivity->mPreviousTransformScale = Nothing();
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IncrementMutationCount(&aActivity->mRestyleCounts[LayerActivity::ACTIVITY_SCALE]);
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return;
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}
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// Compute the new scale due to the CSS transform property.
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nsPresContext* presContext = aFrame->PresContext();
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RuleNodeCacheConditions dummy;
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nsStyleTransformMatrix::TransformReferenceBox refBox(aFrame);
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Matrix4x4 transform =
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nsStyleTransformMatrix::ReadTransforms(display->mSpecifiedTransform->mHead,
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aFrame->StyleContext(),
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presContext,
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dummy, refBox,
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presContext->AppUnitsPerCSSPixel());
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Matrix transform2D;
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if (!transform.Is2D(&transform2D)) {
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// We don't attempt to handle 3D transforms; just assume the scale changed.
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aActivity->mPreviousTransformScale = Nothing();
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IncrementMutationCount(&aActivity->mRestyleCounts[LayerActivity::ACTIVITY_SCALE]);
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return;
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}
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gfxSize scale = ThebesMatrix(transform2D).ScaleFactors(true);
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if (aActivity->mPreviousTransformScale == Some(scale)) {
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return; // Nothing changed.
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}
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aActivity->mPreviousTransformScale = Some(scale);
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IncrementMutationCount(&aActivity->mRestyleCounts[LayerActivity::ACTIVITY_SCALE]);
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}
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/* static */ void
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ActiveLayerTracker::NotifyRestyle(nsIFrame* aFrame, nsCSSProperty aProperty)
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{
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LayerActivity* layerActivity = GetLayerActivityForUpdate(aFrame);
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uint8_t& mutationCount = layerActivity->RestyleCountForProperty(aProperty);
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IncrementMutationCount(&mutationCount);
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if (aProperty == eCSSProperty_transform) {
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IncrementScaleRestyleCountIfNeeded(aFrame, layerActivity);
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}
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}
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/* static */ void
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ActiveLayerTracker::NotifyOffsetRestyle(nsIFrame* aFrame)
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{
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LayerActivity* layerActivity = GetLayerActivityForUpdate(aFrame);
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IncrementMutationCount(&layerActivity->mRestyleCounts[LayerActivity::ACTIVITY_LEFT]);
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IncrementMutationCount(&layerActivity->mRestyleCounts[LayerActivity::ACTIVITY_TOP]);
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IncrementMutationCount(&layerActivity->mRestyleCounts[LayerActivity::ACTIVITY_RIGHT]);
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IncrementMutationCount(&layerActivity->mRestyleCounts[LayerActivity::ACTIVITY_BOTTOM]);
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}
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/* static */ void
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ActiveLayerTracker::NotifyAnimated(nsIFrame* aFrame, nsCSSProperty aProperty)
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{
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LayerActivity* layerActivity = GetLayerActivityForUpdate(aFrame);
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uint8_t& mutationCount = layerActivity->RestyleCountForProperty(aProperty);
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// We know this is animated, so just hack the mutation count.
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mutationCount = 0xFF;
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}
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/* static */ void
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ActiveLayerTracker::NotifyAnimatedFromScrollHandler(nsIFrame* aFrame, nsCSSProperty aProperty,
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nsIFrame* aScrollFrame)
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{
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if (aFrame->PresContext() != aScrollFrame->PresContext()) {
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// Don't allow cross-document dependencies.
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return;
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}
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LayerActivity* layerActivity = GetLayerActivityForUpdate(aFrame);
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LayerActivity::ActivityIndex activityIndex = LayerActivity::GetActivityIndexForProperty(aProperty);
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if (layerActivity->mAnimatingScrollHandlerFrame.GetFrame() != aScrollFrame) {
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// Discard any activity of a different scroll frame. We only track the
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// most recent scroll handler induced activity.
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layerActivity->mScrollHandlerInducedActivity.clear();
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layerActivity->mAnimatingScrollHandlerFrame = aScrollFrame;
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}
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layerActivity->mScrollHandlerInducedActivity += activityIndex;
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}
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static bool
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IsPresContextInScriptAnimationCallback(nsPresContext* aPresContext)
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{
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if (aPresContext->RefreshDriver()->IsInRefresh()) {
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return true;
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}
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// Treat timeouts/setintervals as scripted animation callbacks for our
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// purposes.
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nsPIDOMWindow* win = aPresContext->Document()->GetInnerWindow();
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return win && win->IsRunningTimeout();
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}
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/* static */ void
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ActiveLayerTracker::NotifyInlineStyleRuleModified(nsIFrame* aFrame,
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nsCSSProperty aProperty)
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{
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if (IsPresContextInScriptAnimationCallback(aFrame->PresContext())) {
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NotifyAnimated(aFrame, aProperty);
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}
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if (gLayerActivityTracker &&
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gLayerActivityTracker->mCurrentScrollHandlerFrame.IsAlive()) {
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NotifyAnimatedFromScrollHandler(aFrame, aProperty,
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gLayerActivityTracker->mCurrentScrollHandlerFrame.GetFrame());
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}
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}
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/* static */ bool
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ActiveLayerTracker::IsStyleMaybeAnimated(nsIFrame* aFrame, nsCSSProperty aProperty)
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{
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return IsStyleAnimated(nullptr, aFrame, aProperty);
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}
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static bool
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CheckScrollInducedActivity(LayerActivity* aLayerActivity,
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LayerActivity::ActivityIndex aActivityIndex,
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nsDisplayListBuilder* aBuilder)
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{
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if (!aLayerActivity->mScrollHandlerInducedActivity.contains(aActivityIndex) ||
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!aLayerActivity->mAnimatingScrollHandlerFrame.IsAlive()) {
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return false;
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}
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nsIScrollableFrame* scrollFrame =
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do_QueryFrame(aLayerActivity->mAnimatingScrollHandlerFrame.GetFrame());
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if (scrollFrame && (!aBuilder || scrollFrame->IsScrollingActive(aBuilder))) {
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return true;
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}
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// The scroll frame has been destroyed or has become inactive. Clear it from
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// the layer activity so that it can expire.
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aLayerActivity->mAnimatingScrollHandlerFrame = nullptr;
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aLayerActivity->mScrollHandlerInducedActivity.clear();
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return false;
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}
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/* static */ bool
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ActiveLayerTracker::IsStyleAnimated(nsDisplayListBuilder* aBuilder,
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nsIFrame* aFrame, nsCSSProperty aProperty)
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{
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// TODO: Add some abuse restrictions
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if ((aFrame->StyleDisplay()->mWillChangeBitField & NS_STYLE_WILL_CHANGE_TRANSFORM) &&
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aProperty == eCSSProperty_transform &&
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(!aBuilder || aBuilder->IsInWillChangeBudget(aFrame, aFrame->GetSize()))) {
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return true;
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}
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if ((aFrame->StyleDisplay()->mWillChangeBitField & NS_STYLE_WILL_CHANGE_OPACITY) &&
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aProperty == eCSSProperty_opacity &&
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(!aBuilder || aBuilder->IsInWillChangeBudget(aFrame, aFrame->GetSize()))) {
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return true;
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}
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LayerActivity* layerActivity = GetLayerActivity(aFrame);
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if (layerActivity) {
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LayerActivity::ActivityIndex activityIndex = LayerActivity::GetActivityIndexForProperty(aProperty);
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if (layerActivity->mRestyleCounts[activityIndex] >= 2) {
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return true;
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}
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if (CheckScrollInducedActivity(layerActivity, activityIndex, aBuilder)) {
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return true;
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}
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}
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if (aProperty == eCSSProperty_transform && aFrame->Preserves3D()) {
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||
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return IsStyleAnimated(aBuilder, aFrame->GetParent(), aProperty);
|
||
|
}
|
||
|
return nsLayoutUtils::HasCurrentAnimationsForProperties(aFrame, &aProperty, 1);
|
||
|
}
|
||
|
|
||
|
/* static */ bool
|
||
|
ActiveLayerTracker::IsOffsetOrMarginStyleAnimated(nsIFrame* aFrame)
|
||
|
{
|
||
|
LayerActivity* layerActivity = GetLayerActivity(aFrame);
|
||
|
if (layerActivity) {
|
||
|
if (layerActivity->mRestyleCounts[LayerActivity::ACTIVITY_LEFT] >= 2 ||
|
||
|
layerActivity->mRestyleCounts[LayerActivity::ACTIVITY_TOP] >= 2 ||
|
||
|
layerActivity->mRestyleCounts[LayerActivity::ACTIVITY_RIGHT] >= 2 ||
|
||
|
layerActivity->mRestyleCounts[LayerActivity::ACTIVITY_BOTTOM] >= 2 ||
|
||
|
layerActivity->mRestyleCounts[LayerActivity::ACTIVITY_MARGIN_LEFT] >= 2 ||
|
||
|
layerActivity->mRestyleCounts[LayerActivity::ACTIVITY_MARGIN_TOP] >= 2 ||
|
||
|
layerActivity->mRestyleCounts[LayerActivity::ACTIVITY_MARGIN_RIGHT] >= 2 ||
|
||
|
layerActivity->mRestyleCounts[LayerActivity::ACTIVITY_MARGIN_BOTTOM] >= 2) {
|
||
|
return true;
|
||
|
}
|
||
|
}
|
||
|
// We should also check for running CSS animations of these properties once
|
||
|
// bug 1009693 is fixed. Until that happens, layerization isn't useful for
|
||
|
// animations of these properties because we'll invalidate the layer contents
|
||
|
// on every change anyway.
|
||
|
// See bug 1151346 for a patch that adds a check for CSS animations.
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
// A helper function for IsScaleSubjectToAnimation which returns true if the
|
||
|
// given EffectSet contains a current effect that animates scale.
|
||
|
static bool
|
||
|
ContainsAnimatedScale(EffectSet& aEffects, nsIFrame* aFrame)
|
||
|
{
|
||
|
for (dom::KeyframeEffectReadOnly* effect : aEffects) {
|
||
|
if (!effect->IsCurrent()) {
|
||
|
continue;
|
||
|
}
|
||
|
|
||
|
for (const AnimationProperty& prop : effect->Properties()) {
|
||
|
if (prop.mProperty != eCSSProperty_transform) {
|
||
|
continue;
|
||
|
}
|
||
|
for (AnimationPropertySegment segment : prop.mSegments) {
|
||
|
gfxSize from = segment.mFromValue.GetScaleValue(aFrame);
|
||
|
if (from != gfxSize(1.0f, 1.0f)) {
|
||
|
return true;
|
||
|
}
|
||
|
gfxSize to = segment.mToValue.GetScaleValue(aFrame);
|
||
|
if (to != gfxSize(1.0f, 1.0f)) {
|
||
|
return true;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
/* static */ bool
|
||
|
ActiveLayerTracker::IsScaleSubjectToAnimation(nsIFrame* aFrame)
|
||
|
{
|
||
|
// Check whether JavaScript is animating this frame's scale.
|
||
|
LayerActivity* layerActivity = GetLayerActivity(aFrame);
|
||
|
if (layerActivity && layerActivity->mRestyleCounts[LayerActivity::ACTIVITY_SCALE] >= 2) {
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
// Check if any animations, transitions, etc. associated with this frame may
|
||
|
// animate its scale.
|
||
|
EffectSet* effects = EffectSet::GetEffectSet(aFrame);
|
||
|
if (effects && ContainsAnimatedScale(*effects, aFrame)) {
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
/* static */ void
|
||
|
ActiveLayerTracker::NotifyContentChange(nsIFrame* aFrame)
|
||
|
{
|
||
|
LayerActivity* layerActivity = GetLayerActivityForUpdate(aFrame);
|
||
|
layerActivity->mContentActive = true;
|
||
|
}
|
||
|
|
||
|
/* static */ bool
|
||
|
ActiveLayerTracker::IsContentActive(nsIFrame* aFrame)
|
||
|
{
|
||
|
LayerActivity* layerActivity = GetLayerActivity(aFrame);
|
||
|
return layerActivity && layerActivity->mContentActive;
|
||
|
}
|
||
|
|
||
|
/* static */ void
|
||
|
ActiveLayerTracker::SetCurrentScrollHandlerFrame(nsIFrame* aFrame)
|
||
|
{
|
||
|
if (!gLayerActivityTracker) {
|
||
|
gLayerActivityTracker = new LayerActivityTracker();
|
||
|
}
|
||
|
gLayerActivityTracker->mCurrentScrollHandlerFrame = aFrame;
|
||
|
}
|
||
|
|
||
|
/* static */ void
|
||
|
ActiveLayerTracker::Shutdown()
|
||
|
{
|
||
|
delete gLayerActivityTracker;
|
||
|
gLayerActivityTracker = nullptr;
|
||
|
}
|
||
|
|
||
|
} // namespace mozilla
|