Make classes and structures in core/paint fast-allocated.

Source/core/paint/DeprecatedPaintLayerClipper.h

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
@@ skipping 30 matching lines @@
  * If you do not delete the provisions above, a recipient may use your
  * version of this file under any of the LGPL, the MPL or the GPL.
  */
 
 #ifndef DeprecatedPaintLayerClipper_h
 #define DeprecatedPaintLayerClipper_h
 
 #include "core/layout/ClipRects.h"
 #include "core/layout/ClipRectsCache.h"
 #include "core/layout/LayoutBox.h"
+#include "wtf/Allocator.h"
 
 namespace blink {
 
 class DeprecatedPaintLayer;
 
 // This is the state information passed down
 // on the stack for calculating clip rects.
 struct ClipRectComputationState {
+    STACK_ALLOCATED();
     ClipRectComputationState()
     {
         currentClipRects.reset(LayoutRect(LayoutRect::infiniteIntRect()));
         stackingContextClipRects.reset(LayoutRect(LayoutRect::infiniteIntRect()));
     }
     // Depending on the value of context.isComputingPaintingRect() can have different meanings
     // In painting, this ClipRects is used for statically positioned elements,
     // outside painting, it is the only ClipRects, and is used for all elements.
     ClipRects currentClipRects;
     // During painting this ClipRects is used for positioned elements. It can have
     // a rootLayer further up the tree than currentClipRects because its root must be
     // beyond the enclosing stacking context. See resetPaintRects.
     ClipRects stackingContextClipRects;
 };
 
 enum ShouldRespectOverflowClip {
     IgnoreOverflowClip,
     RespectOverflowClip
 };
 
 class ClipRectsContext {
+    STACK_ALLOCATED();
 public:
     ClipRectsContext(const DeprecatedPaintLayer* root, ClipRectsCacheSlot slot, OverlayScrollbarSizeRelevancy relevancy = IgnoreOverlayScrollbarSize, const LayoutSize& accumulation = LayoutSize())
         : rootLayer(root)
         , scrollbarRelevancy(relevancy)
         , m_cacheSlot(slot)
         , subPixelAccumulation(accumulation)
         , respectOverflowClip(slot == PaintingClipRectsIgnoringOverflowClip ? IgnoreOverflowClip : RespectOverflowClip)
         , respectOverflowClipForViewport(slot == RootRelativeClipRectsIgnoringViewportClip ? IgnoreOverflowClip : RespectOverflowClip)
     {
     }
@@ skipping 28 matching lines @@
 private:
     friend class DeprecatedPaintLayerClipper;
 
     ClipRectsCacheSlot m_cacheSlot;
     LayoutSize subPixelAccumulation;
     ShouldRespectOverflowClip respectOverflowClip;
     ShouldRespectOverflowClip respectOverflowClipForViewport;
 };
 
 class DeprecatedPaintLayerClipper {
+    DISALLOW_ALLOCATION();
     WTF_MAKE_NONCOPYABLE(DeprecatedPaintLayerClipper);
 public:
     explicit DeprecatedPaintLayerClipper(LayoutBoxModelObject&);
 
     void clearClipRectsIncludingDescendants();
     void clearClipRectsIncludingDescendants(ClipRectsCacheSlot);
 
     LayoutRect childrenClipRect() const; // Returns the foreground clip rect of the layer in the document's coordinate space.
     LayoutRect localClipRect() const; // Returns the background clip rect of the layer in the local coordinate space.
 
@@ skipping 24 matching lines @@
     bool shouldRespectOverflowClip(const ClipRectsContext&) const;
 
     // FIXME: Could this be a LayoutBox?
     LayoutBoxModelObject& m_layoutObject;
     mutable OwnPtr<ClipRect> m_clips[NumberOfClipRectsCacheSlots];
 };
 
 } // namespace blink
 
 #endif // LayerClipper_h