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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef StyleRuleUsageTracker_h | 5 #ifndef StyleRuleUsageTracker_h |
6 #define StyleRuleUsageTracker_h | 6 #define StyleRuleUsageTracker_h |
7 | 7 |
8 #include "core/css/CSSStyleRule.h" | 8 #include "core/css/CSSStyleRule.h" |
9 | 9 |
10 namespace blink { | 10 namespace blink { |
11 | 11 |
12 class StyleRule; | 12 class StyleRule; |
13 | 13 |
14 class StyleRuleUsageTracker : public GarbageCollected<StyleRuleUsageTracker> { | 14 class StyleRuleUsageTracker : public GarbageCollected<StyleRuleUsageTracker> { |
15 public: | 15 public: |
16 void track(StyleRule* rule) { m_ruleList.insert(rule); } | 16 using RuleListByStyleSheet = HeapHashMap<Member<const CSSStyleSheet>, |
| 17 HeapVector<Member<const StyleRule>>>; |
17 | 18 |
18 bool contains(StyleRule*) const; | 19 void track(const CSSStyleSheet*, const StyleRule*); |
| 20 RuleListByStyleSheet takeDelta(); |
19 | 21 |
20 DECLARE_TRACE(); | 22 DECLARE_TRACE(); |
21 | 23 |
22 private: | 24 private: |
23 HeapHashSet<Member<StyleRule>> m_ruleList; | 25 HeapHashSet<std::pair<Member<const CSSStyleSheet>, Member<const StyleRule>>> |
| 26 m_usedRules; |
| 27 RuleListByStyleSheet m_usedRulesDelta; |
24 }; | 28 }; |
25 | 29 |
26 } // namespace blink | 30 } // namespace blink |
27 | 31 |
28 #endif // StyleRuleUsageTracker_h | 32 #endif // StyleRuleUsageTracker_h |
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