Add helper for computing outset for 'outline'

Source/core/layout/svg/SVGLayoutSupport.cpp

 /*
  * Copyright (C) 2007, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.  All rights reserved.
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 33 matching lines @@
 
 namespace blink {
 
 static inline LayoutRect enclosingIntRectIfNotEmpty(const FloatRect& rect)
 {
     if (rect.isEmpty())
         return LayoutRect();
     return LayoutRect(enclosingIntRect(rect));
 }
 
-static void inflateWithOutlineIfNeeded(FloatRect& paintInvalidationRect, const ComputedStyle& style)
-{
-    if (!style.hasOutline())
-        return;
-    int outlineSize = 0;
-    if (style.outlineStyleIsAuto())
-        outlineSize = GraphicsContext::focusRingOutsetExtent(style.outlineOffset(), style.outlineWidth());
-    else
-        outlineSize = style.outlineSize();
-    paintInvalidationRect.inflate(outlineSize);
-}
-
 LayoutRect SVGLayoutSupport::clippedOverflowRectForPaintInvalidation(const LayoutObject& object, const LayoutBoxModelObject* paintInvalidationContainer, const PaintInvalidationState* paintInvalidationState)
 {
     // Return early for any cases where we don't actually paint
-    if (object.style()->visibility() != VISIBLE && !object.enclosingLayer()->hasVisibleContent())
+    if (object.styleRef().visibility() != VISIBLE && !object.enclosingLayer()->hasVisibleContent())
         return LayoutRect();
 
     FloatRect paintInvalidationRect = object.paintInvalidationRectInLocalCoordinates();
-    inflateWithOutlineIfNeeded(paintInvalidationRect, object.styleRef());
+    if (int outlineOutset = object.styleRef().outlineOutset())
+        paintInvalidationRect.inflate(outlineOutset);
 
     if (paintInvalidationState && paintInvalidationState->canMapToContainer(paintInvalidationContainer)) {
         // Compute accumulated SVG transform and apply to local paint rect.
         AffineTransform transform = paintInvalidationState->svgTransform() * object.localToParentTransform();
         // FIXME: These are quirks carried forward from the old paint invalidation infrastructure.
         LayoutRect rect = enclosingIntRectIfNotEmpty(transform.mapRect(paintInvalidationRect));
         // Offset by SVG root paint offset and apply clipping as needed.
         rect.move(paintInvalidationState->paintOffset());
         if (paintInvalidationState->isClipped())
             rect.intersect(paintInvalidationState->clipRect());
@@ skipping 382 matching lines @@
 
     // FIXME: trying to compute a device space transform at record time is wrong. All clients
     // should be updated to avoid relying on this information, and the method should be removed.
     AffineTransform ctm = deprecatedCalculateTransformToLayer(layoutObject) * currentContentTransformation();
     ctm.scale(layoutObject->document().frameHost()->deviceScaleFactor());
 
     return narrowPrecisionToFloat(sqrt((pow(ctm.xScale(), 2) + pow(ctm.yScale(), 2)) / 2));
 }
 
 }