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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 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 SubsequenceRecorder_h | 5 #ifndef SubsequenceRecorder_h |
| 6 #define SubsequenceRecorder_h | 6 #define SubsequenceRecorder_h |
| 7 | 7 |
| 8 #include "platform/graphics/GraphicsContext.h" | 8 #include "platform/graphics/GraphicsContext.h" |
| 9 #include "platform/graphics/paint/DisplayItem.h" | 9 #include "platform/graphics/paint/DisplayItem.h" |
| 10 #include "platform/graphics/paint/PaintController.h" | 10 #include "platform/graphics/paint/PaintController.h" |
| 11 #include "wtf/Allocator.h" | 11 #include "wtf/Allocator.h" |
| 12 #include "wtf/Noncopyable.h" | 12 #include "wtf/Noncopyable.h" |
| 13 | 13 |
| 14 namespace blink { | 14 namespace blink { |
| 15 | 15 |
| 16 class GraphicsContext; | 16 class GraphicsContext; |
| 17 class PaintController; | 17 class PaintController; |
| 18 | 18 |
| 19 // SubsequenceRecorder records BeginSubsequenceDisplayItem and EndSubsequenceDis
playItem | 19 // SubsequenceRecorder records BeginSubsequenceDisplayItem and |
| 20 // sentinels at either end of a continguous sequence of DisplayItems, and suppor
ts | 20 // EndSubsequenceDisplayItem sentinels at either end of a continguous sequence |
| 21 // caching via a CachedDisplayItem with the CachedSubsequence DisplayItem type. | 21 // of DisplayItems, and supports caching via a CachedDisplayItem with the |
| 22 // CachedSubsequence DisplayItem type. |
| 22 // | 23 // |
| 23 // Also note that useCachedSubsequenceIfPossible is not sufficient to determine
whether a | 24 // Also note that useCachedSubsequenceIfPossible is not sufficient to determine |
| 24 // CachedSubsequence can be used. In particular, the client is responsible for c
hecking that | 25 // whether a CachedSubsequence can be used. In particular, the client is |
| 25 // none of the DisplayItemClients that contribute to the subsequence have been i
nvalidated. | 26 // responsible for checking that none of the DisplayItemClients that contribute |
| 27 // to the subsequence have been invalidated. |
| 26 // | 28 // |
| 27 class PLATFORM_EXPORT SubsequenceRecorder final { | 29 class PLATFORM_EXPORT SubsequenceRecorder final { |
| 28 DISALLOW_NEW_EXCEPT_PLACEMENT_NEW(); | 30 DISALLOW_NEW_EXCEPT_PLACEMENT_NEW(); |
| 29 WTF_MAKE_NONCOPYABLE(SubsequenceRecorder); | 31 WTF_MAKE_NONCOPYABLE(SubsequenceRecorder); |
| 30 | 32 |
| 31 public: | 33 public: |
| 32 static bool useCachedSubsequenceIfPossible(GraphicsContext& context, | 34 static bool useCachedSubsequenceIfPossible(GraphicsContext& context, |
| 33 const DisplayItemClient& client) { | 35 const DisplayItemClient& client) { |
| 34 return context.getPaintController().useCachedSubsequenceIfPossible(client); | 36 return context.getPaintController().useCachedSubsequenceIfPossible(client); |
| 35 } | 37 } |
| 36 | 38 |
| 37 SubsequenceRecorder(GraphicsContext&, const DisplayItemClient&); | 39 SubsequenceRecorder(GraphicsContext&, const DisplayItemClient&); |
| 38 ~SubsequenceRecorder(); | 40 ~SubsequenceRecorder(); |
| 39 | 41 |
| 40 private: | 42 private: |
| 41 PaintController& m_paintController; | 43 PaintController& m_paintController; |
| 42 const DisplayItemClient& m_client; | 44 const DisplayItemClient& m_client; |
| 43 size_t m_beginSubsequenceIndex; | 45 size_t m_beginSubsequenceIndex; |
| 44 }; | 46 }; |
| 45 | 47 |
| 46 } // namespace blink | 48 } // namespace blink |
| 47 | 49 |
| 48 #endif // SubsequenceRecorder_h | 50 #endif // SubsequenceRecorder_h |
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