mirror of
https://github.com/classilla/tenfourfox.git
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510 lines
19 KiB
C++
510 lines
19 KiB
C++
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/* -*- 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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/**
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* A class which manages pending restyles. This handles keeping track
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* of what nodes restyles need to happen on and so forth.
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*/
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#include "RestyleTracker.h"
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#include "GeckoProfiler.h"
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#include "nsDocShell.h"
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#include "nsFrameManager.h"
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#include "nsIDocument.h"
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#include "nsStyleChangeList.h"
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#include "RestyleManager.h"
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#include "RestyleTrackerInlines.h"
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#include "nsTransitionManager.h"
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#include "mozilla/RestyleTimelineMarker.h"
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namespace mozilla {
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#ifdef RESTYLE_LOGGING
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static nsCString
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GetDocumentURI(nsIDocument* aDocument)
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{
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nsCString result;
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nsString url;
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aDocument->GetDocumentURI(url);
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result.Append(NS_ConvertUTF16toUTF8(url).get());
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return result;
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}
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static nsCString
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FrameTagToString(dom::Element* aElement)
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{
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nsCString result;
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nsIFrame* frame = aElement->GetPrimaryFrame();
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if (frame) {
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nsFrame::ListTag(result, frame);
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} else {
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nsAutoString buf;
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aElement->NodeInfo()->NameAtom()->ToString(buf);
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result.AppendPrintf("(%s@%p)", NS_ConvertUTF16toUTF8(buf).get(), aElement);
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}
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return result;
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}
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#endif
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inline nsIDocument*
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RestyleTracker::Document() const {
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return mRestyleManager->PresContext()->Document();
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}
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#define RESTYLE_ARRAY_STACKSIZE 128
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struct LaterSiblingCollector {
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RestyleTracker* tracker;
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nsTArray< RefPtr<dom::Element> >* elements;
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};
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static PLDHashOperator
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CollectLaterSiblings(nsISupports* aElement,
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nsAutoPtr<RestyleTracker::RestyleData>& aData,
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void* aSiblingCollector)
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{
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dom::Element* element =
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static_cast<dom::Element*>(aElement);
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LaterSiblingCollector* collector =
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static_cast<LaterSiblingCollector*>(aSiblingCollector);
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// Only collect the entries that actually need restyling by us (and
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// haven't, for example, already been restyled).
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// It's important to not mess with the flags on entries not in our
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// document.
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if (element->GetCrossShadowCurrentDoc() == collector->tracker->Document() &&
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element->HasFlag(collector->tracker->RestyleBit()) &&
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(aData->mRestyleHint & eRestyle_LaterSiblings)) {
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collector->elements->AppendElement(element);
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}
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return PL_DHASH_NEXT;
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}
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struct RestyleEnumerateData : RestyleTracker::Hints {
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RefPtr<dom::Element> mElement;
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#if defined(MOZ_ENABLE_PROFILER_SPS) && !defined(MOZILLA_XPCOMRT_API)
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UniquePtr<ProfilerBacktrace> mBacktrace;
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#endif
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};
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struct RestyleCollector {
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RestyleTracker* tracker;
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RestyleEnumerateData** restyleArrayPtr;
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#ifdef RESTYLE_LOGGING
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uint32_t count;
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#endif
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};
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static PLDHashOperator
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CollectRestyles(nsISupports* aElement,
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nsAutoPtr<RestyleTracker::RestyleData>& aData,
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void* aRestyleCollector)
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{
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dom::Element* element =
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static_cast<dom::Element*>(aElement);
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RestyleCollector* collector =
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static_cast<RestyleCollector*>(aRestyleCollector);
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// Only collect the entries that actually need restyling by us (and
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// haven't, for example, already been restyled).
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// It's important to not mess with the flags on entries not in our
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// document.
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if (element->GetCrossShadowCurrentDoc() != collector->tracker->Document() ||
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!element->HasFlag(collector->tracker->RestyleBit())) {
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LOG_RESTYLE_IF(collector->tracker, true,
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"skipping pending restyle %s, already restyled or no longer "
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"in the document", FrameTagToString(element).get());
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return PL_DHASH_NEXT;
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}
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NS_ASSERTION(!element->HasFlag(collector->tracker->RootBit()) ||
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// Maybe we're just not reachable via the frame tree?
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(element->GetFlattenedTreeParent() &&
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(!element->GetFlattenedTreeParent()->GetPrimaryFrame() ||
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element->GetFlattenedTreeParent()->GetPrimaryFrame()->IsLeaf() ||
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element->GetCrossShadowCurrentDoc()->GetShell()->FrameManager()
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->GetDisplayContentsStyleFor(element))) ||
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// Or not reachable due to an async reinsert we have
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// pending? If so, we'll have a reframe hint around.
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// That incidentally makes it safe that we still have
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// the bit, since any descendants that didn't get added
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// to the roots list because we had the bits will be
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// completely restyled in a moment.
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(aData->mChangeHint & nsChangeHint_ReconstructFrame),
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"Why did this not get handled while processing mRestyleRoots?");
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// Unset the restyle bits now, so if they get readded later as we
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// process we won't clobber that adding of the bit.
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element->UnsetFlags(collector->tracker->RestyleBit() |
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collector->tracker->RootBit() |
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collector->tracker->ConditionalDescendantsBit());
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RestyleEnumerateData** restyleArrayPtr = collector->restyleArrayPtr;
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RestyleEnumerateData* currentRestyle = *restyleArrayPtr;
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currentRestyle->mElement = element;
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currentRestyle->mRestyleHint = aData->mRestyleHint;
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currentRestyle->mChangeHint = aData->mChangeHint;
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// We can move aData since we'll be clearing mPendingRestyles after
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// we finish enumerating it.
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currentRestyle->mRestyleHintData = Move(aData->mRestyleHintData);
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#if defined(MOZ_ENABLE_PROFILER_SPS) && !defined(MOZILLA_XPCOMRT_API)
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currentRestyle->mBacktrace = Move(aData->mBacktrace);
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#endif
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#ifdef RESTYLE_LOGGING
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collector->count++;
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#endif
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// Increment to the next slot in the array
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*restyleArrayPtr = currentRestyle + 1;
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return PL_DHASH_NEXT;
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}
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inline void
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RestyleTracker::ProcessOneRestyle(Element* aElement,
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nsRestyleHint aRestyleHint,
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nsChangeHint aChangeHint,
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const RestyleHintData& aRestyleHintData)
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{
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NS_PRECONDITION((aRestyleHint & eRestyle_LaterSiblings) == 0,
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"Someone should have handled this before calling us");
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NS_PRECONDITION(Document(), "Must have a document");
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NS_PRECONDITION(aElement->GetCrossShadowCurrentDoc() == Document(),
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"Element has unexpected document");
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LOG_RESTYLE("aRestyleHint = %s, aChangeHint = %s",
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RestyleManager::RestyleHintToString(aRestyleHint).get(),
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RestyleManager::ChangeHintToString(aChangeHint).get());
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nsIFrame* primaryFrame = aElement->GetPrimaryFrame();
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if (aRestyleHint & ~eRestyle_LaterSiblings) {
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#ifdef RESTYLE_LOGGING
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if (ShouldLogRestyle() && primaryFrame &&
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RestyleManager::StructsToLog() != 0) {
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LOG_RESTYLE("style context tree before restyle:");
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LOG_RESTYLE_INDENT();
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primaryFrame->StyleContext()->LogStyleContextTree(
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LoggingDepth(), RestyleManager::StructsToLog());
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}
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#endif
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mRestyleManager->RestyleElement(aElement, primaryFrame, aChangeHint,
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*this, aRestyleHint, aRestyleHintData);
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} else if (aChangeHint &&
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(primaryFrame ||
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(aChangeHint & nsChangeHint_ReconstructFrame))) {
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// Don't need to recompute style; just apply the hint
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nsStyleChangeList changeList;
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changeList.AppendChange(primaryFrame, aElement, aChangeHint);
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mRestyleManager->ProcessRestyledFrames(changeList);
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}
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}
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void
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RestyleTracker::DoProcessRestyles()
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{
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nsAutoCString docURL;
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if (profiler_is_active()) {
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nsIURI *uri = Document()->GetDocumentURI();
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if (uri) {
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uri->GetSpec(docURL);
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} else {
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docURL = "N/A";
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}
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}
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PROFILER_LABEL_PRINTF("RestyleTracker", "ProcessRestyles",
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js::ProfileEntry::Category::CSS, "(%s)", docURL.get());
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nsDocShell* docShell = static_cast<nsDocShell*>(mRestyleManager->PresContext()->GetDocShell());
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RefPtr<TimelineConsumers> timelines = TimelineConsumers::Get();
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bool isTimelineRecording = timelines && timelines->HasConsumer(docShell);
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// Create a AnimationsWithDestroyedFrame during restyling process to
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// stop animations on elements that have no frame at the end of the
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// restyling process.
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RestyleManager::AnimationsWithDestroyedFrame
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animationsWithDestroyedFrame(mRestyleManager);
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// Create a ReframingStyleContexts struct on the stack and put it in our
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// mReframingStyleContexts for almost all of the remaining scope of
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// this function.
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//
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// It needs to be *in* scope during BeginProcessingRestyles, which
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// might (if mDoRebuildAllStyleData is true) do substantial amounts of
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// restyle processing.
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//
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// However, it needs to be *out* of scope during
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// EndProcessingRestyles, since we should release the style contexts
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// it holds prior to any EndReconstruct call that
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// EndProcessingRestyles makes. This is because in EndReconstruct we
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// try to destroy the old rule tree using the GC mechanism, which
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// means it only gets destroyed if it's unreferenced (and if it's
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// referenced, we assert). So we want the ReframingStyleContexts
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// (which holds old style contexts) to be destroyed before the
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// EndReconstruct so those style contexts go away before
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// EndReconstruct.
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{
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RestyleManager::ReframingStyleContexts
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reframingStyleContexts(mRestyleManager);
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mRestyleManager->BeginProcessingRestyles(*this);
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LOG_RESTYLE("Processing %d pending %srestyles with %d restyle roots for %s",
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mPendingRestyles.Count(),
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mRestyleManager->PresContext()->TransitionManager()->
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InAnimationOnlyStyleUpdate()
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? (const char*) "animation " : (const char*) "",
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static_cast<int>(mRestyleRoots.Length()),
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GetDocumentURI(Document()).get());
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LOG_RESTYLE_INDENT();
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// loop so that we process any restyle events generated by processing
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while (mPendingRestyles.Count()) {
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if (mHaveLaterSiblingRestyles) {
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// Convert them to individual restyles on all the later siblings
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nsAutoTArray<RefPtr<Element>, RESTYLE_ARRAY_STACKSIZE> laterSiblingArr;
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LaterSiblingCollector siblingCollector = { this, &laterSiblingArr };
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mPendingRestyles.Enumerate(CollectLaterSiblings, &siblingCollector);
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for (uint32_t i = 0; i < laterSiblingArr.Length(); ++i) {
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Element* element = laterSiblingArr[i];
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for (nsIContent* sibling = element->GetNextSibling();
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sibling;
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sibling = sibling->GetNextSibling()) {
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if (sibling->IsElement()) {
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LOG_RESTYLE("adding pending restyle for %s due to "
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"eRestyle_LaterSiblings hint on %s",
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FrameTagToString(sibling->AsElement()).get(),
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FrameTagToString(element->AsElement()).get());
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if (AddPendingRestyle(sibling->AsElement(), eRestyle_Subtree,
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NS_STYLE_HINT_NONE)) {
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// Nothing else to do here; we'll handle the following
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// siblings when we get to |sibling| in laterSiblingArr.
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break;
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}
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}
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}
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}
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// Now remove all those eRestyle_LaterSiblings bits
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for (uint32_t i = 0; i < laterSiblingArr.Length(); ++i) {
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Element* element = laterSiblingArr[i];
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NS_ASSERTION(element->HasFlag(RestyleBit()), "How did that happen?");
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RestyleData* data;
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#ifdef DEBUG
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bool found =
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#endif
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mPendingRestyles.Get(element, &data);
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NS_ASSERTION(found, "Where did our entry go?");
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data->mRestyleHint =
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nsRestyleHint(data->mRestyleHint & ~eRestyle_LaterSiblings);
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}
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LOG_RESTYLE("%d pending restyles after expanding out "
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"eRestyle_LaterSiblings", mPendingRestyles.Count());
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mHaveLaterSiblingRestyles = false;
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}
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uint32_t rootCount;
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while ((rootCount = mRestyleRoots.Length())) {
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// Make sure to pop the element off our restyle root array, so
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// that we can freely append to the array as we process this
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// element.
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RefPtr<Element> element;
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element.swap(mRestyleRoots[rootCount - 1]);
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mRestyleRoots.RemoveElementAt(rootCount - 1);
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LOG_RESTYLE("processing style root %s at index %d",
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FrameTagToString(element).get(), rootCount - 1);
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LOG_RESTYLE_INDENT();
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// Do the document check before calling GetRestyleData, since we
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// don't want to do the sibling-processing GetRestyleData does if
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// the node is no longer relevant.
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if (element->GetCrossShadowCurrentDoc() != Document()) {
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// Content node has been removed from our document; nothing else
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// to do here
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LOG_RESTYLE("skipping, no longer in the document");
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continue;
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}
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nsAutoPtr<RestyleData> data;
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if (!GetRestyleData(element, data)) {
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LOG_RESTYLE("skipping, already restyled");
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continue;
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}
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if (isTimelineRecording) {
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timelines->AddMarkerForDocShell(docShell, Move(
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MakeUnique<RestyleTimelineMarker>(
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data->mRestyleHint, MarkerTracingType::START)));
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}
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#if defined(MOZ_ENABLE_PROFILER_SPS) && !defined(MOZILLA_XPCOMRT_API)
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Maybe<GeckoProfilerTracingRAII> profilerRAII;
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if (profiler_feature_active("restyle")) {
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profilerRAII.emplace("Paint", "Styles", Move(data->mBacktrace));
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}
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#endif
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ProcessOneRestyle(element, data->mRestyleHint, data->mChangeHint,
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data->mRestyleHintData);
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AddRestyleRootsIfAwaitingRestyle(data->mDescendants);
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if (isTimelineRecording) {
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timelines->AddMarkerForDocShell(docShell, Move(
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MakeUnique<RestyleTimelineMarker>(
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data->mRestyleHint, MarkerTracingType::END)));
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}
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}
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if (mHaveLaterSiblingRestyles) {
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// Keep processing restyles for now
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continue;
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}
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// Now we only have entries with change hints left. To be safe in
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// case of reentry from the handing of the change hint, use a
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// scratch array instead of calling out to ProcessOneRestyle while
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// enumerating the hashtable. Use the stack if we can, otherwise
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// fall back on heap-allocation.
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nsAutoTArray<RestyleEnumerateData, RESTYLE_ARRAY_STACKSIZE> restyleArr;
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RestyleEnumerateData* restylesToProcess =
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restyleArr.AppendElements(mPendingRestyles.Count());
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if (restylesToProcess) {
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RestyleEnumerateData* lastRestyle = restylesToProcess;
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RestyleCollector collector = { this, &lastRestyle };
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mPendingRestyles.Enumerate(CollectRestyles, &collector);
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// Clear the hashtable now that we don't need it anymore
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mPendingRestyles.Clear();
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#ifdef RESTYLE_LOGGING
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uint32_t index = 0;
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#endif
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for (RestyleEnumerateData* currentRestyle = restylesToProcess;
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currentRestyle != lastRestyle;
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++currentRestyle) {
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LOG_RESTYLE("processing pending restyle %s at index %d/%d",
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FrameTagToString(currentRestyle->mElement).get(),
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index++, collector.count);
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LOG_RESTYLE_INDENT();
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#if defined(MOZ_ENABLE_PROFILER_SPS) && !defined(MOZILLA_XPCOMRT_API)
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Maybe<GeckoProfilerTracingRAII> profilerRAII;
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if (profiler_feature_active("restyle")) {
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profilerRAII.emplace("Paint", "Styles", Move(currentRestyle->mBacktrace));
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}
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#endif
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||
|
if (isTimelineRecording) {
|
||
|
timelines->AddMarkerForDocShell(docShell, Move(
|
||
|
MakeUnique<RestyleTimelineMarker>(
|
||
|
currentRestyle->mRestyleHint, MarkerTracingType::START)));
|
||
|
}
|
||
|
|
||
|
ProcessOneRestyle(currentRestyle->mElement,
|
||
|
currentRestyle->mRestyleHint,
|
||
|
currentRestyle->mChangeHint,
|
||
|
currentRestyle->mRestyleHintData);
|
||
|
|
||
|
if (isTimelineRecording) {
|
||
|
timelines->AddMarkerForDocShell(docShell, Move(
|
||
|
MakeUnique<RestyleTimelineMarker>(
|
||
|
currentRestyle->mRestyleHint, MarkerTracingType::END)));
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// mPendingRestyles is now empty.
|
||
|
mHaveSelectors = false;
|
||
|
|
||
|
mRestyleManager->EndProcessingRestyles();
|
||
|
}
|
||
|
|
||
|
bool
|
||
|
RestyleTracker::GetRestyleData(Element* aElement, nsAutoPtr<RestyleData>& aData)
|
||
|
{
|
||
|
NS_PRECONDITION(aElement->GetCrossShadowCurrentDoc() == Document(),
|
||
|
"Unexpected document; this will lead to incorrect behavior!");
|
||
|
|
||
|
if (!aElement->HasFlag(RestyleBit())) {
|
||
|
NS_ASSERTION(!aElement->HasFlag(RootBit()), "Bogus root bit?");
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
mPendingRestyles.RemoveAndForget(aElement, aData);
|
||
|
NS_ASSERTION(aData.get(), "Must have data if restyle bit is set");
|
||
|
|
||
|
if (aData->mRestyleHint & eRestyle_LaterSiblings) {
|
||
|
// Someone readded the eRestyle_LaterSiblings hint for this
|
||
|
// element. Leave it around for now, but remove the other restyle
|
||
|
// hints and the change hint for it. Also unset its root bit,
|
||
|
// since it's no longer a root with the new restyle data.
|
||
|
NS_ASSERTION(aData->mDescendants.IsEmpty(),
|
||
|
"expected descendants to be handled by now");
|
||
|
RestyleData* newData = new RestyleData;
|
||
|
newData->mChangeHint = nsChangeHint(0);
|
||
|
newData->mRestyleHint = eRestyle_LaterSiblings;
|
||
|
mPendingRestyles.Put(aElement, newData);
|
||
|
aElement->UnsetFlags(RootBit());
|
||
|
aData->mRestyleHint =
|
||
|
nsRestyleHint(aData->mRestyleHint & ~eRestyle_LaterSiblings);
|
||
|
} else {
|
||
|
aElement->UnsetFlags(mRestyleBits);
|
||
|
}
|
||
|
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
void
|
||
|
RestyleTracker::AddRestyleRootsIfAwaitingRestyle(
|
||
|
const nsTArray<RefPtr<Element>>& aElements)
|
||
|
{
|
||
|
// The RestyleData for a given element has stored in mDescendants
|
||
|
// the list of descendants we need to end up restyling. Since we
|
||
|
// won't necessarily end up restyling them, due to the restyle
|
||
|
// process finishing early (see how eRestyleResult_Stop is handled
|
||
|
// in ElementRestyler::Restyle), we add them to the list of restyle
|
||
|
// roots to handle the next time around the
|
||
|
// RestyleTracker::DoProcessRestyles loop.
|
||
|
//
|
||
|
// Note that aElements must maintain the same invariant
|
||
|
// that mRestyleRoots does, i.e. that ancestors appear after descendants.
|
||
|
// Since we call AddRestyleRootsIfAwaitingRestyle only after we have
|
||
|
// removed the restyle root we are currently processing from the end of
|
||
|
// mRestyleRoots, and the only elements we get here in aElements are
|
||
|
// descendants of that restyle root, we are safe to simply append to the
|
||
|
// end of mRestyleRoots to maintain its invariant.
|
||
|
for (size_t i = 0; i < aElements.Length(); i++) {
|
||
|
Element* element = aElements[i];
|
||
|
if (element->HasFlag(RestyleBit())) {
|
||
|
mRestyleRoots.AppendElement(element);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
void
|
||
|
RestyleTracker::ClearSelectors()
|
||
|
{
|
||
|
if (!mHaveSelectors) {
|
||
|
return;
|
||
|
}
|
||
|
for (auto it = mPendingRestyles.Iter(); !it.Done(); it.Next()) {
|
||
|
RestyleData* data = it.Data();
|
||
|
if (data->mRestyleHint & eRestyle_SomeDescendants) {
|
||
|
data->mRestyleHint =
|
||
|
(data->mRestyleHint & ~eRestyle_SomeDescendants) | eRestyle_Subtree;
|
||
|
data->mRestyleHintData.mSelectorsForDescendants.Clear();
|
||
|
} else {
|
||
|
MOZ_ASSERT(data->mRestyleHintData.mSelectorsForDescendants.IsEmpty());
|
||
|
}
|
||
|
}
|
||
|
mHaveSelectors = false;
|
||
|
}
|
||
|
|
||
|
} // namespace mozilla
|