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| 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef GeometryMapperTransformCache_h |
| 6 #define GeometryMapperTransformCache_h |
| 7 |
| 8 #include "platform/PlatformExport.h" |
| 9 |
| 10 #include "platform/transforms/TransformationMatrix.h" |
| 11 #include "wtf/Vector.h" |
| 12 |
| 13 namespace blink { |
| 14 |
| 15 class TransformPaintPropertyNode; |
| 16 |
| 17 // A GeometryMapperTransformCache hangs off a TransformPaintPropertyNode. It |
| 18 // stores cached "transformed rects" (See GeometryMapper.h) from that node in |
| 19 // ancestor spaces. |
| 20 class PLATFORM_EXPORT GeometryMapperTransformCache { |
| 21 public: |
| 22 // Returns the transformed rect (see GeometryMapper.h) of |this| in the |
| 23 // space of |ancestorTransform|, if there is one cached. Otherwise returns |
| 24 // null. |
| 25 const TransformationMatrix* getCachedTransform( |
| 26 const TransformPaintPropertyNode* ancestorTransform); |
| 27 |
| 28 // Stores the "transformed rect" of |this| in the space of |ancestors|, |
| 29 // into a local cache. |
| 30 void setCachedTransform(const TransformPaintPropertyNode* ancestorTransform, |
| 31 const TransformationMatrix& toAncestor); |
| 32 |
| 33 static void clearCache(); |
| 34 |
| 35 private: |
| 36 struct TransformCacheEntry { |
| 37 const TransformPaintPropertyNode* ancestorNode; |
| 38 TransformationMatrix toAncestor; |
| 39 TransformCacheEntry(const TransformPaintPropertyNode* ancestorNodeArg, |
| 40 const TransformationMatrix& toAncestorArg) |
| 41 : ancestorNode(ancestorNodeArg), toAncestor(toAncestorArg) {} |
| 42 }; |
| 43 |
| 44 Vector<TransformCacheEntry>* getTransformCacheEntries(); |
| 45 |
| 46 std::unique_ptr<Vector<TransformCacheEntry>> m_transformCache; |
| 47 unsigned m_cacheGeneration; |
| 48 }; |
| 49 |
| 50 } // namespace blink |
| 51 |
| 52 #endif // GeometryMapperTransformCache_h |
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