Paint local attachment backgrounds into composited scrolling contents layer

third_party/WebKit/Source/core/style/ComputedStyleConstants.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 161 matching lines @@
 };
 
 enum EFillAttachment {
     ScrollBackgroundAttachment, LocalBackgroundAttachment, FixedBackgroundAttachment
 };
 
 enum EFillBox {
     BorderFillBox, PaddingFillBox, ContentFillBox, TextFillBox
 };
 
+inline EFillBox enclosingFillBox(EFillBox boxA, EFillBox boxB)
+{
+    if (boxA == BorderFillBox || boxB == BorderFillBox)
+        return BorderFillBox;
+    if (boxA == PaddingFillBox || boxB == PaddingFillBox)
+        return PaddingFillBox;
+    if (boxA == ContentFillBox || boxB == ContentFillBox)
+        return ContentFillBox;
+    return TextFillBox;
+}
+
 enum EFillRepeat {
     RepeatFill, NoRepeatFill, RoundFill, SpaceFill
 };
 
 enum EFillLayerType {
     BackgroundFillLayer, MaskFillLayer
 };
 
 // CSS3 Background Values
 enum EFillSizeType { Contain, Cover, SizeLength, SizeNone };
@@ skipping 428 matching lines @@
 
 enum AutoRepeatType {
     NoAutoRepeat,
     AutoFill,
     AutoFit
 };
 
 } // namespace blink
 
 #endif // ComputedStyleConstants_h