[SPInvalidation] Micro-optimize PaintLayerClipper::calculateRects

third_party/WebKit/Source/core/paint/PaintLayerClipper.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 173 matching lines @@
   // Returns the background clip rect of the layer in the local coordinate
   // space. Only looks for clips up to the given ancestor.
   LayoutRect LocalClipRect(const PaintLayer& ancestor_layer) const;
 
   // Computes the same thing as backgroundRect in calculateRects(), but skips
   // applying CSS clip and the visualOverflowRect() of |m_layer|.
   void CalculateBackgroundClipRect(const ClipRectsContext&,
                                    ClipRect& output) const;
 
   // This method figures out our layerBounds in coordinates relative to
-  // |rootLayer|. It also computes our background and foreground clip rects
+  // |root_layer|. It also computes our background and foreground clip rects
   // for painting/event handling. Pass offsetFromRoot if known.
+  // If provided, |offset_from_root| is not changed and assumed to already
+  // include subpixel accumualation. Otherwise it is set to the offset from
+  // |layer_| to |root_layer|, plus |context.sub_pixel_accumuation|.
   void CalculateRects(const ClipRectsContext&,
                       const LayoutRect& paint_dirty_rect,
                       LayoutRect& layer_bounds,
                       ClipRect& background_rect,
                       ClipRect& foreground_rect,
                       const LayoutPoint* offset_from_root = 0) const;
 
   ClipRects& PaintingClipRects(const PaintLayer* root_layer,
                                ShouldRespectOverflowClipType,
                                const LayoutSize& subpixel_accumulation) const;
@@ skipping 10 matching lines @@
 
   void GetOrCalculateClipRects(const ClipRectsContext&, ClipRects&) const;
 
   ALWAYS_INLINE bool ShouldClipOverflow(const ClipRectsContext&) const;
   ALWAYS_INLINE bool ShouldRespectOverflowClip(const ClipRectsContext&) const;
 
   // Returned clip rect in |output| is in the space of the context's rootLayer.
   ALWAYS_INLINE void CalculateBackgroundClipRectWithGeometryMapper(
       const ClipRectsContext&,
       ClipRect& output) const;
-  ALWAYS_INLINE void CalculateForegroundClipRectWithGeometryMapper(
-      const ClipRectsContext&,
-      ClipRect& output) const;
 
   ALWAYS_INLINE void InitializeCommonClipRectState(
       const ClipRectsContext&,
       PropertyTreeState& descendant_property_tree_state,
       PropertyTreeState& ancestor_property_tree_state) const;
 
   // Same as calculateRects, but using GeometryMapper.
   ALWAYS_INLINE void CalculateRectsWithGeometryMapper(
       const ClipRectsContext&,
       const LayoutRect& paint_dirty_rect,
       LayoutRect& layer_bounds,
       ClipRect& background_rect,
       ClipRect& foreground_rect,
       const LayoutPoint* offset_from_root = 0) const;
 
   // Returns the visual rect of m_layer in local space. This includes
   // filter effects.
   ALWAYS_INLINE LayoutRect LocalVisualRect() const;
 
   const PaintLayer& layer_;
   bool use_geometry_mapper_;
 
   friend class PaintLayerClipperTest;
 };
 
 }  // namespace blink
 
 #endif  // LayerClipper_h