Merge 147127 "RenderBox::backgroundIsKnownToBeOpaqueInRect may b..."

Source/WebCore/rendering/RenderBox.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. 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
  * License as published by the Free Software Foundation; either
@@ skipping 1153 matching lines @@
 
 bool RenderBox::backgroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect) const
 {
     if (isBody() && skipBodyBackground(this))
         return false;
 
     Color backgroundColor = style()->visitedDependentColor(CSSPropertyBackgroundColor);
     if (!backgroundColor.isValid() || backgroundColor.hasAlpha())
         return false;
 
+    // If the element has appearance, it might be painted by theme.
+    // We cannot be sure if theme paints the background opaque.
+    // In this case it is safe to not assume opaqueness.
+    // FIXME: May be ask theme if it paints opaque.
+    if (style()->hasAppearance())
+        return false;
     // FIXME: Check the opaqueness of background images.
 
     // FIXME: Use rounded rect if border radius is present.
     if (style()->hasBorderRadius())
         return false;
     // FIXME: The background color clip is defined by the last layer.
     if (style()->backgroundLayers()->next())
         return false;
     LayoutRect backgroundRect;
     switch (style()->backgroundClip()) {
@@ skipping 3398 matching lines @@
 
 void RenderBox::reportStaticMembersMemoryUsage(MemoryInstrumentation* memoryInstrumentation)
 {
     memoryInstrumentation->addRootObject(gOverrideHeightMap, WebCoreMemoryTypes::RenderingStructures);
     memoryInstrumentation->addRootObject(gOverrideWidthMap, WebCoreMemoryTypes::RenderingStructures);
     memoryInstrumentation->addRootObject(gOverrideContainingBlockLogicalHeightMap, WebCoreMemoryTypes::RenderingStructures);
     memoryInstrumentation->addRootObject(gOverrideContainingBlockLogicalWidthMap, WebCoreMemoryTypes::RenderingStructures);
 }
 
 } // namespace WebCore