src/third_party/WebKit/Source/core/rendering/compositing/CompositingReasonFinder.h

   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 blink {
  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 potentialCompositingReasonsFromStyle(RenderObject*) const;
  23     CompositingReasons directReasons(const RenderLayer*) const;
  24
  25     void updateTriggers();
  26
  27     bool hasOverflowScrollTrigger() const;
  28     bool requiresCompositingForScrollableFrame() const;
  29
  30 private:
  31     bool isMainFrame() const;
  32
  33     CompositingReasons nonStyleDeterminedDirectReasons(const RenderLayer*) const;
  34
  35     bool requiresCompositingForTransform(RenderObject*) const;
  36     bool requiresCompositingForAnimation(RenderStyle*) const;
  37     bool requiresCompositingForPositionFixed(const RenderLayer*) const;
  38
  39     RenderView& m_renderView;
  40     CompositingTriggerFlags m_compositingTriggers;
  41 };
  42
  43 } // namespace blink
  44
  45 #endif // CompositingReasonFinder_h