Simplify and speed up painting of clipping masks

third_party/WebKit/Source/core/paint/LayerClipRecorder.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef LayerClipRecorder_h
 #define LayerClipRecorder_h
 
 #include "core/CoreExport.h"
 #include "core/paint/PaintLayerPaintingInfo.h"
 #include "core/paint/PaintPhase.h"
@@ skipping 35 matching lines @@
       const LayoutBoxModelObject&,
       DisplayItem::Type,
       const ClipRect&,
       const PaintLayerPaintingInfo* localPaintingInfo,
       const LayoutPoint& fragmentOffset,
       PaintLayerFlags,
       BorderRadiusClippingRule = IncludeSelfForBorderRadius);
 
   ~LayerClipRecorder();
 
+  // Access to clip rects to support filling mask layers.
+  const IntRect& snappedClipRect() const { return m_snappedClipRect; }
+  const Vector<FloatRoundedRect>& roundedRects() const {
+    return m_roundedRects;
+  }
+
  private:
   void collectRoundedRectClips(PaintLayer&,
                                const PaintLayerPaintingInfo& localPaintingInfo,
                                GraphicsContext&,
                                const LayoutPoint& fragmentOffset,
                                PaintLayerFlags,
-                               BorderRadiusClippingRule,
-                               Vector<FloatRoundedRect>& roundedRectClips);
+                               BorderRadiusClippingRule);
 
   GraphicsContext& m_graphicsContext;
   const LayoutBoxModelObject& m_layoutObject;
   DisplayItem::Type m_clipType;
+  IntRect m_snappedClipRect;
+  Vector<FloatRoundedRect> m_roundedRects;
 };
 
 }  // namespace blink
 
 #endif  // LayerClipRecorder_h