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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 CompositingReasonFinder_h
      6 #define CompositingReasonFinder_h
      7 
      8 #include "core/rendering/RenderLayer.h"
      9 #include "core/rendering/compositing/CompositingTriggers.h"
     10 #include "platform/graphics/CompositingReasons.h"
     11 
     12 namespace WebCore {
     13 
     14 class RenderObject;
     15 class RenderView;
     16 
     17 class CompositingReasonFinder {
     18     WTF_MAKE_NONCOPYABLE(CompositingReasonFinder);
     19 public:
     20     explicit CompositingReasonFinder(RenderView&);
     21 
     22     CompositingReasons styleDeterminedReasons(RenderObject*) const;
     23     CompositingReasons directReasons(const RenderLayer*) const;
     24 
     25     void updateTriggers();
     26 
     27     bool hasOverflowScrollTrigger() const;
     28 
     29     bool requiresCompositingForScrollableFrame() const;
     30     bool requiresCompositingForPositionFixed(RenderObject*, const RenderLayer*, RenderLayer::ViewportConstrainedNotCompositedReason*) const;
     31 
     32 private:
     33     bool isMainFrame() const;
     34 
     35     CompositingReasons nonStyleDeterminedDirectReasons(const RenderLayer*) const;
     36 
     37     bool requiresCompositingForTransform(RenderObject*) const;
     38     bool requiresCompositingForFilters(RenderObject*) const;
     39     bool requiresCompositingForAnimation(RenderStyle*) const;
     40 
     41     RenderView& m_renderView;
     42     CompositingTriggerFlags m_compositingTriggers;
     43 };
     44 
     45 } // namespace WebCore
     46 
     47 #endif // CompositingReasonFinder_h
     48