1 files changed, 4 insertions, 5 deletions
diff --git a/Source/WebCore/rendering/RenderBoxModelObject.cpp b/Source/WebCore/rendering/RenderBoxModelObject.cpp
index 8f9b9a622..5eef3ccac 100644
--- a/Source/WebCore/rendering/RenderBoxModelObject.cpp
+++ b/Source/WebCore/rendering/RenderBoxModelObject.cpp
@@ -1171,13 +1171,11 @@ void RenderBoxModelObject::calculateBackgroundImageGeometry(const FillLayer* fil
         // its margins. Since those were added in already, we have to factor them out when computing
         // the background positioning area.
         if (isRoot()) {
-            positioningAreaSize = IntSize(snapSizeToPixel(toRenderBox(this)->width() - left - right, toRenderBox(this)->x()),
-                                          snapSizeToPixel(toRenderBox(this)->height() - top - bottom, toRenderBox(this)->y()));
+            positioningAreaSize = pixelSnappedIntSize(toRenderBox(this)->size() - LayoutSize(left + right, top + bottom), toRenderBox(this)->location());
             left += marginLeft();
             top += marginTop();
         } else
-            positioningAreaSize = IntSize(snapSizeToPixel(paintRect.width() - left - right, paintRect.x()),
-                                          snapSizeToPixel(paintRect.height() - top - bottom, paintRect.y()));
+            positioningAreaSize = pixelSnappedIntSize(paintRect.size() - LayoutSize(left + right, top + bottom), paintRect.location());
     } else {
         geometry.setDestRect(pixelSnappedIntRect(viewRect()));
         positioningAreaSize = geometry.destRect().size();
@@ -1410,7 +1408,7 @@ public:
     }
     
     bool hasVisibleColorAndStyle() const { return style > BHIDDEN && !isTransparent; }
-    bool shouldRender() const { return isPresent && hasVisibleColorAndStyle(); }
+    bool shouldRender() const { return isPresent && width && hasVisibleColorAndStyle(); }
     bool presentButInvisible() const { return usedWidth() && !hasVisibleColorAndStyle(); }
     bool obscuresBackgroundEdge(float scale) const
     {
@@ -1648,6 +1646,7 @@ void RenderBoxModelObject::paintOneBorderSide(GraphicsContext* graphicsContext,
     BackgroundBleedAvoidance bleedAvoidance, bool includeLogicalLeftEdge, bool includeLogicalRightEdge, bool antialias, const Color* overrideColor)
 {
     const BorderEdge& edgeToRender = edges[side];
+    ASSERT(edgeToRender.width);
     const BorderEdge& adjacentEdge1 = edges[adjacentSide1];
     const BorderEdge& adjacentEdge2 = edges[adjacentSide2];