Ting-Yu Lin
db551c4afc
All the `operator==` converted was implemented via comparing all the member variables, so they can be implemented using `=default`. Drop the inaccurate comment for `nsStyleImageLayers::Layers::operator==` since the `mImage` was compared using plain `==`. This patch doesn't change behavior. Differential Revision: https://phabricator.services.mozilla.com/D319376
91 lines
3.1 KiB
C++
91 lines
3.1 KiB
C++
/* 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/ComputedStyleInlines.h"
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#include "mozilla/ServoStyleSet.h"
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#include "mozilla/dom/Element.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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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(nsPresContext* aPresContext,
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nsIContent* aContent,
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ComputedStyle* aStyle,
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PseudoStyleType aPseudoType,
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const AtomArray& aInputWord) {
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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 atom for the pseudo-element.
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const nsStaticAtom* pseudoAtom = PseudoStyle::GetAtom(aPseudoType);
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Transition transition(0, const_cast<nsStaticAtom*>(pseudoAtom));
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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(), aPseudoType, 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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// 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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