forked from mirrors/gecko-dev
9af107a839
This makes the naming more consistent with other functions called Insert and/or Update. Also, it removes the ambiguity whether Put expects that an entry already exists or not, in particular because it differed from nsTHashtable::PutEntry in that regard. Differential Revision: https://phabricator.services.mozilla.com/D105473
102 lines
3.6 KiB
C++
102 lines
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "nsTreeStyleCache.h"
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#include "mozilla/dom/Element.h"
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#include "mozilla/ServoStyleSet.h"
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#include "nsPresContextInlines.h"
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using namespace mozilla;
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nsTreeStyleCache::Transition::Transition(DFAState aState, nsAtom* aSymbol)
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: mState(aState), mInputSymbol(aSymbol) {}
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bool nsTreeStyleCache::Transition::operator==(const Transition& aOther) const {
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return aOther.mState == mState && aOther.mInputSymbol == mInputSymbol;
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}
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uint32_t nsTreeStyleCache::Transition::Hash() const {
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// Make a 32-bit integer that combines the low-order 16 bits of the state and
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// the input symbol.
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uint32_t hb = mState << 16;
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uint32_t lb = (NS_PTR_TO_UINT32(mInputSymbol.get()) << 16) >> 16;
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return hb + lb;
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}
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// The ComputedStyle cache impl
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ComputedStyle* nsTreeStyleCache::GetComputedStyle(
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nsPresContext* aPresContext, nsIContent* aContent, ComputedStyle* aStyle,
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nsCSSAnonBoxPseudoStaticAtom* aPseudoElement, const AtomArray& aInputWord) {
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MOZ_ASSERT(nsCSSAnonBoxes::IsTreePseudoElement(aPseudoElement));
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uint32_t count = aInputWord.Length();
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// Go ahead and init the transition table.
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if (!mTransitionTable) {
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// Automatic miss. Build the table
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mTransitionTable = MakeUnique<TransitionTable>();
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}
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// The first transition is always made off the supplied pseudo-element.
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Transition transition(0, aPseudoElement);
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DFAState currState = mTransitionTable->Get(transition);
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if (!currState) {
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// We had a miss. Make a new state and add it to our hash.
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currState = mNextState;
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mNextState++;
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mTransitionTable->InsertOrUpdate(transition, currState);
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}
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for (uint32_t i = 0; i < count; i++) {
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Transition transition(currState, aInputWord[i]);
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currState = mTransitionTable->Get(transition);
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if (!currState) {
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// We had a miss. Make a new state and add it to our hash.
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currState = mNextState;
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mNextState++;
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mTransitionTable->InsertOrUpdate(transition, currState);
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}
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}
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// We're in a final state.
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// Look up our ComputedStyle for this state.
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ComputedStyle* result = nullptr;
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if (mCache) {
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result = mCache->GetWeak(currState);
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}
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if (!result) {
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// We missed the cache. Resolve this pseudo-style.
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RefPtr<ComputedStyle> newResult =
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aPresContext->StyleSet()->ResolveXULTreePseudoStyle(
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aContent->AsElement(), aPseudoElement, aStyle, aInputWord);
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// Normally we rely on nsIFrame::Init / RestyleManager to call this, but
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// these are weird and don't use a frame, yet ::-moz-tree-twisty definitely
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// pokes at list-style-image.
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newResult->StartImageLoads(*aPresContext->Document());
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// Even though xul-tree pseudos are defined in nsCSSAnonBoxList, nothing has
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// ever treated them as an anon box, and they don't ever get boxes anyway.
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//
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// This is really weird, and probably nothing really relies on the result of
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// these assert, but it's here just to avoid changing them accidentally.
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MOZ_ASSERT(newResult->GetPseudoType() == PseudoStyleType::XULTree);
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MOZ_ASSERT(!newResult->IsAnonBox());
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MOZ_ASSERT(!newResult->IsPseudoElement());
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// Put the ComputedStyle in our table, transferring the owning reference to
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// the table.
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if (!mCache) {
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mCache = MakeUnique<ComputedStyleCache>();
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}
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result = newResult.get();
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mCache->InsertOrUpdate(currState, std::move(newResult));
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}
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return result;
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}
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