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
83 lines
2.5 KiB
C++
83 lines
2.5 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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#ifndef nsTreeStyleCache_h_
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#define nsTreeStyleCache_h_
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#include "mozilla/AtomArray.h"
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#include "mozilla/ComputedStyle.h"
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#include "mozilla/UniquePtr.h"
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#include "nsCOMArray.h"
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#include "nsRefPtrHashtable.h"
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#include "nsTHashMap.h"
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class nsIContent;
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namespace mozilla {
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enum class PseudoStyleType : uint8_t;
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}
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class nsTreeStyleCache {
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public:
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nsTreeStyleCache() : mNextState(0) {}
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~nsTreeStyleCache() { Clear(); }
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void Clear() {
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mTransitionTable = nullptr;
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mCache = nullptr;
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mNextState = 0;
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}
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mozilla::ComputedStyle* GetComputedStyle(
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nsPresContext* aPresContext, nsIContent* aContent,
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mozilla::ComputedStyle* aStyle, mozilla::PseudoStyleType aPseudoType,
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const mozilla::AtomArray& aInputWord);
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protected:
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typedef uint32_t DFAState;
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class Transition final {
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public:
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Transition(DFAState aState, nsAtom* aSymbol);
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bool operator==(const Transition&) const = default;
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uint32_t Hash() const;
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private:
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DFAState mState;
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RefPtr<nsAtom> mInputSymbol;
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};
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typedef nsTHashMap<nsGenericHashKey<Transition>, DFAState> TransitionTable;
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// A transition table for a deterministic finite automaton. The DFA
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// takes as its input a single pseudoelement and an ordered set of properties.
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// It transitions on an input word that is the concatenation of the
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// pseudoelement supplied with the properties in the array.
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//
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// It transitions from state to state by looking up entries in the transition
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// table (which is a mapping from (S,i)->S', where S is the current state, i
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// is the next property in the input word, and S' is the state to transition
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// to.
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//
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// If S' is not found, it is constructed and entered into the hashtable
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// under the key (S,i).
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//
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// Once the entire word has been consumed, the final state is used
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// to reference the cache table to locate the ComputedStyle.
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mozilla::UniquePtr<TransitionTable> mTransitionTable;
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// The cache of all active ComputedStyles. This is a hash from
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// a final state in the DFA, Sf, to the resultant ComputedStyle.
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typedef nsRefPtrHashtable<nsUint32HashKey, mozilla::ComputedStyle>
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ComputedStyleCache;
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mozilla::UniquePtr<ComputedStyleCache> mCache;
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// An integer counter that is used when we need to make new states in the
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// DFA.
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DFAState mNextState;
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};
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#endif // nsTreeStyleCache_h_
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