Apply SVG viewport clips in PaintLayer; paint background of replaced like boxes.

third_party/WebKit/Source/core/paint/PaintLayerClipper.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. 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 387 matching lines @@
   // Ensure that our parent's clip has been calculated so that we can examine
   // the values.
   if (parentLayer) {
     parentLayer->clipper().getOrCalculateClipRects(context, clipRects);
   } else {
     clipRects.reset(LayoutRect(LayoutRect::infiniteIntRect()));
   }
 
   adjustClipRectsForChildren(layoutObject, clipRects);
 
-  if (shouldClipOverflow(context) || layoutObject.hasClip() ||
-      (layoutObject.isSVGRoot() &&
-       toLayoutSVGRoot(&layoutObject)->shouldApplyViewportClip())) {
+  if (shouldClipOverflow(context) || layoutObject.hasClip()) {
     // This offset cannot use convertToLayerCoords, because sometimes our
     // rootLayer may be across some transformed layer boundary, for example, in
     // the PaintLayerCompositor overlapMap, where clipRects are needed in view
     // space.
     applyClipRects(context, layoutObject,
                    LayoutPoint(layoutObject.localToAncestorPoint(
                        FloatPoint(), context.rootLayer->layoutObject())),
                    clipRects);
   }
 }
@@ skipping 96 matching lines @@
 void PaintLayerClipper::getOrCalculateClipRects(const ClipRectsContext& context,
                                                 ClipRects& clipRects) const {
   if (context.usesCache())
     clipRects = getClipRects(context);
   else
     calculateClipRects(context, clipRects);
 }
 
 bool PaintLayerClipper::shouldClipOverflow(
     const ClipRectsContext& context) const {
-  return (m_layer.layoutObject()->hasOverflowClip() ||
-          m_layer.layoutObject()->styleRef().containsPaint()) &&
+  LayoutObject* layoutObject = m_layer.layoutObject();
+  return (layoutObject->hasOverflowClip() ||
+          layoutObject->styleRef().containsPaint() ||
+          (layoutObject->isSVGRoot() &&
+           toLayoutSVGRoot(layoutObject)->shouldApplyViewportClip())) &&
          shouldRespectOverflowClip(context);
 }
 
 bool PaintLayerClipper::shouldRespectOverflowClip(
     const ClipRectsContext& context) const {
   if (&m_layer != context.rootLayer)
     return true;
 
   if (context.respectOverflowClip == IgnoreOverflowClip)
     return false;
@@ skipping 11 matching lines @@
     const LayoutSize& subpixelAccumulation) const {
   DCHECK(!m_geometryMapper);
   ClipRectsContext context(rootLayer, PaintingClipRects,
                            IgnoreOverlayScrollbarSize, subpixelAccumulation);
   if (respectOverflowClip == IgnoreOverflowClip)
     context.setIgnoreOverflowClip();
   return getClipRects(context);
 }
 
 }  // namespace blink