chromium/src/third_party/blink/renderer/core/paint/compositing/compositing_requirements_updater.h

/*
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 * Copyright (C) 2014 Google Inc. All rights reserved.
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#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_COMPOSITING_COMPOSITING_REQUIREMENTS_UPDATER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_COMPOSITING_COMPOSITING_REQUIREMENTS_UPDATER_H_

#include "third_party/blink/renderer/platform/geometry/int_rect.h"
#include "third_party/blink/renderer/platform/graphics/compositing_reasons.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"

namespace blink {

class PaintLayer;
class LayoutView;

class CompositingRequirementsUpdater {
  STACK_ALLOCATED();

 public:
  CompositingRequirementsUpdater(LayoutView&);

  //  Recurse through the layers in z-index and overflow order (which is
  //  equivalent to painting order)
  //  For the z-order children of a compositing layer:
  //      If a child layers has a compositing layer, then all subsequent layers
  //      must be compositing in order to render above that layer.
  //
  //      If a child in the negative z-order list is compositing, then the layer
  //      itself must be compositing so that its contents render over that
  //      child.  This implies that its positive z-index children must also be
  //      compositing.
  //
  void Update(PaintLayer* root, CompositingReasonsStats&);

 private:
  class OverlapMap;
  class RecursionData;

  void UpdateRecursive(PaintLayer* ancestor_layer,
                       PaintLayer* current_layer,
                       OverlapMap&,
                       RecursionData&,
                       bool& descendant_has3d_transform,
                       Vector<PaintLayer*>& unclipped_descendants,
                       IntRect& absolute_descendant_bounding_box,
                       CompositingReasonsStats&);

  LayoutView& layout_view_;
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_COMPOSITING_COMPOSITING_REQUIREMENTS_UPDATER_H_