Rounded background image fast path

third_party/WebKit/Source/core/paint/BackgroundImageGeometry.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BackgroundImageGeometry_h
 #define BackgroundImageGeometry_h
 
 #include "core/paint/PaintPhase.h"
 #include "platform/geometry/LayoutPoint.h"
 #include "platform/geometry/LayoutRect.h"
 #include "platform/geometry/LayoutSize.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
 class FillLayer;
 class LayoutBoxModelObject;
 class LayoutObject;
 class LayoutRect;
 
 class BackgroundImageGeometry {
-    STACK_ALLOCATED();
+    DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
 public:
     BackgroundImageGeometry()
         : m_hasNonLocalGeometry(false)
     { }
 
     void calculate(const LayoutBoxModelObject&, const LayoutBoxModelObject* paintContainer,
         const GlobalPaintFlags, const FillLayer&, const LayoutRect& paintRect);
 
-    LayoutRect destRect() const { return m_destRect; }
-    LayoutSize tileSize() const { return m_tileSize; }
-    LayoutPoint phase() const { return m_phase; }
+    const LayoutRect& destRect() const { return m_destRect; }
+    const LayoutSize& tileSize() const { return m_tileSize; }
+    const LayoutPoint& phase() const { return m_phase; }
     // Space-size represents extra width and height that may be added to
     // the image if used as a pattern with background-repeat: space.
-    LayoutSize spaceSize() const { return m_repeatSpacing; }
+    const LayoutSize& spaceSize() const { return m_repeatSpacing; }
     // Has background-attachment: fixed. Implies that we can't always cheaply compute destRect.
     bool hasNonLocalGeometry() const { return m_hasNonLocalGeometry; }
 
 private:
     void setDestRect(const LayoutRect& destRect) { m_destRect = destRect; }
     void setPhase(const LayoutPoint& phase) { m_phase = phase; }
     void setTileSize(const LayoutSize& tileSize) { m_tileSize = tileSize; }
     void setSpaceSize(const LayoutSize& repeatSpacing) { m_repeatSpacing = repeatSpacing; }
     void setPhaseX(LayoutUnit x) { m_phase.setX(x); }
     void setPhaseY(LayoutUnit y) { m_phase.setY(y); }
@@ skipping 10 matching lines @@
     LayoutRect m_destRect;
     LayoutPoint m_phase;
     LayoutSize m_tileSize;
     LayoutSize m_repeatSpacing;
     bool m_hasNonLocalGeometry;
 };
 
 } // namespace blink
 
 #endif // BackgroundImageGeometry_h