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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 blink {
     11 
     12 class RenderLayer;
     13 
     14 class CompositingInputsUpdater {
     15 public:
     16     explicit CompositingInputsUpdater(RenderLayer* rootRenderLayer);
     17     ~CompositingInputsUpdater();
     18 
     19     void update();
     20 
     21 #if ENABLE(ASSERT)
     22     static void assertNeedsCompositingInputsUpdateBitsCleared(RenderLayer*);
     23 #endif
     24 
     25 private:
     26     enum UpdateType {
     27         DoNotForceUpdate,
     28         ForceUpdate,
     29     };
     30 
     31     struct AncestorInfo {
     32         AncestorInfo()
     33             : ancestorStackingContext(0)
     34             , enclosingCompositedLayer(0)
     35             , lastScrollingAncestor(0)
     36             , hasAncestorWithClipOrOverflowClip(false)
     37             , hasAncestorWithClipPath(false)
     38         {
     39         }
     40 
     41         RenderLayer* ancestorStackingContext;
     42         RenderLayer* enclosingCompositedLayer;
     43         // Notice that lastScrollingAncestor isn't the same thing as
     44         // ancestorScrollingLayer. The former is just the nearest scrolling
     45         // along the RenderLayer::parent() chain. The latter is the layer that
     46         // actually controls the scrolling of this layer, which we find on the
     47         // containing block chain.
     48         RenderLayer* lastScrollingAncestor;
     49         bool hasAncestorWithClipOrOverflowClip;
     50         bool hasAncestorWithClipPath;
     51     };
     52 
     53     void updateRecursive(RenderLayer*, UpdateType, AncestorInfo);
     54 
     55     RenderGeometryMap m_geometryMap;
     56     RenderLayer* m_rootRenderLayer;
     57 };
     58 
     59 } // namespace blink
     60 
     61 #endif // CompositingInputsUpdater_h
     62