Use reference for FillLayer if possible

Source/core/rendering/style/RenderStyle.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, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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 633 matching lines @@
     EFillRepeat backgroundRepeatX() const { return static_cast<EFillRepeat>(m_background->background().repeatX()); }
     EFillRepeat backgroundRepeatY() const { return static_cast<EFillRepeat>(m_background->background().repeatY()); }
     CompositeOperator backgroundComposite() const { return static_cast<CompositeOperator>(m_background->background().composite()); }
     EFillAttachment backgroundAttachment() const { return static_cast<EFillAttachment>(m_background->background().attachment()); }
     EFillBox backgroundClip() const { return static_cast<EFillBox>(m_background->background().clip()); }
     EFillBox backgroundOrigin() const { return static_cast<EFillBox>(m_background->background().origin()); }
     const Length& backgroundXPosition() const { return m_background->background().xPosition(); }
     const Length& backgroundYPosition() const { return m_background->background().yPosition(); }
     EFillSizeType backgroundSizeType() const { return m_background->background().sizeType(); }
     const LengthSize& backgroundSizeLength() const { return m_background->background().sizeLength(); }
-    FillLayer* accessBackgroundLayers() { return &(m_background.access()->m_background); }
-    const FillLayer* backgroundLayers() const { return &(m_background->background()); }
+    FillLayer& accessBackgroundLayers() { return m_background.access()->m_background; }
+    const FillLayer& backgroundLayers() const { return m_background->background(); }
 
     StyleImage* maskImage() const { return rareNonInheritedData->m_mask.image(); }
     EFillRepeat maskRepeatX() const { return static_cast<EFillRepeat>(rareNonInheritedData->m_mask.repeatX()); }
     EFillRepeat maskRepeatY() const { return static_cast<EFillRepeat>(rareNonInheritedData->m_mask.repeatY()); }
     CompositeOperator maskComposite() const { return static_cast<CompositeOperator>(rareNonInheritedData->m_mask.composite()); }
     EFillBox maskClip() const { return static_cast<EFillBox>(rareNonInheritedData->m_mask.clip()); }
     EFillBox maskOrigin() const { return static_cast<EFillBox>(rareNonInheritedData->m_mask.origin()); }
     const Length& maskXPosition() const { return rareNonInheritedData->m_mask.xPosition(); }
     const Length& maskYPosition() const { return rareNonInheritedData->m_mask.yPosition(); }
     EFillSizeType maskSizeType() const { return rareNonInheritedData->m_mask.sizeType(); }
     const LengthSize& maskSizeLength() const { return rareNonInheritedData->m_mask.sizeLength(); }
-    FillLayer* accessMaskLayers() { return &(rareNonInheritedData.access()->m_mask); }
-    const FillLayer* maskLayers() const { return &(rareNonInheritedData->m_mask); }
+    FillLayer& accessMaskLayers() { return rareNonInheritedData.access()->m_mask; }
+    const FillLayer& maskLayers() const { return rareNonInheritedData->m_mask; }
 
     const NinePieceImage& maskBoxImage() const { return rareNonInheritedData->m_maskBoxImage; }
     StyleImage* maskBoxImageSource() const { return rareNonInheritedData->m_maskBoxImage.image(); }
     const LengthBox& maskBoxImageSlices() const { return rareNonInheritedData->m_maskBoxImage.imageSlices(); }
     bool maskBoxImageSlicesFill() const { return rareNonInheritedData->m_maskBoxImage.fill(); }
     const BorderImageLengthBox& maskBoxImageWidth() const { return rareNonInheritedData->m_maskBoxImage.borderSlices(); }
     const BorderImageLengthBox& maskBoxImageOutset() const { return rareNonInheritedData->m_maskBoxImage.outset(); }
 
     EBorderCollapse borderCollapse() const { return static_cast<EBorderCollapse>(inherited_flags._border_collapse); }
     short horizontalBorderSpacing() const;
@@ skipping 457 matching lines @@
     void setImageRendering(EImageRendering v) { SET_VAR(rareInheritedData, m_imageRendering, v); }
 
     void setWhiteSpace(EWhiteSpace v) { inherited_flags._white_space = v; }
 
     // FIXME: Remove these two and replace them with respective FontBuilder calls.
     void setWordSpacing(float);
     void setLetterSpacing(float);
 
     void adjustBackgroundLayers()
     {
-        if (backgroundLayers()->next()) {
-            accessBackgroundLayers()->cullEmptyLayers();
-            accessBackgroundLayers()->fillUnsetProperties();
+        if (backgroundLayers().next()) {
+            accessBackgroundLayers().cullEmptyLayers();
+            accessBackgroundLayers().fillUnsetProperties();
         }
     }
 
     void adjustMaskLayers()
     {
-        if (maskLayers()->next()) {
-            accessMaskLayers()->cullEmptyLayers();
-            accessMaskLayers()->fillUnsetProperties();
+        if (maskLayers().next()) {
+            accessMaskLayers().cullEmptyLayers();
+            accessMaskLayers().fillUnsetProperties();
         }
     }
 
     void setMaskImage(PassRefPtr<StyleImage> v) { rareNonInheritedData.access()->m_mask.setImage(v); }
 
     void setMaskBoxImage(const NinePieceImage& b) { SET_VAR(rareNonInheritedData, m_maskBoxImage, b); }
     void setMaskBoxImageSource(PassRefPtr<StyleImage> v) { rareNonInheritedData.access()->m_maskBoxImage.setImage(v); }
     void setMaskBoxImageSlices(const LengthBox& slices)
     {
         rareNonInheritedData.access()->m_maskBoxImage.setImageSlices(slices);
@@ skipping 740 matching lines @@
 inline bool RenderStyle::hasPseudoElementStyle() const
 {
     return noninherited_flags.pseudoBits & PSEUDO_ELEMENT_MASK;
 }
 
 float calcBorderRadiiConstraintScaleFor(const FloatRect&, const FloatRoundedRect::Radii&);
 
 } // namespace WebCore
 
 #endif // RenderStyle_h