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      1 // Copyright 2014 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 CompositingInputsUpdater_h
      6 #define CompositingInputsUpdater_h
      7 
      8 #include "core/rendering/RenderGeometryMap.h"
      9 
     10 namespace WebCore {
     11 
     12 class RenderLayer;
     13 
     14 class CompositingInputsUpdater {
     15 private:
     16     struct AncestorInfo {
     17         AncestorInfo()
     18             : enclosingCompositedLayer(0)
     19             , ancestorScrollingLayer(0)
     20         {
     21         }
     22 
     23         RenderLayer* enclosingCompositedLayer;
     24         RenderLayer* ancestorScrollingLayer;
     25     };
     26 
     27 public:
     28     explicit CompositingInputsUpdater(RenderLayer* rootRenderLayer);
     29     ~CompositingInputsUpdater();
     30 
     31     enum UpdateType {
     32         DoNotForceUpdate,
     33         ForceUpdate,
     34     };
     35 
     36     void update(RenderLayer*, UpdateType = DoNotForceUpdate, AncestorInfo = AncestorInfo());
     37 
     38 #if ASSERT_ENABLED
     39     static void assertNeedsCompositingInputsUpdateBitsCleared(RenderLayer*);
     40 #endif
     41 
     42 private:
     43     RenderGeometryMap m_geometryMap;
     44     RenderLayer* m_rootRenderLayer;
     45 };
     46 
     47 } // namespace WebCore
     48 
     49 #endif // CompositingInputsUpdater_h
     50