Bug 654858: Fix float-to-nscoord rounding issue in SVG intrinsic ratio, with certain GCC versions & optimizations. r=roc

layout/svg/base/src/nsSVGOuterSVGFrame.cpp

@@ -275,7 +275,8 @@ nsSVGOuterSVGFrame::GetIntrinsicRatio()
   nsSVGLength2 &height = content->mLengthAttributes[nsSVGSVGElement::HEIGHT];
 
   if (!width.IsPercentage() && !height.IsPercentage()) {
-    nsSize ratio(width.GetAnimValue(content), height.GetAnimValue(content));
+    nsSize ratio(NSToCoordRoundWithClamp(width.GetAnimValue(content)),
+                 NSToCoordRoundWithClamp(height.GetAnimValue(content)));
     if (ratio.width < 0) {
       ratio.width = 0;
     }
@@ -296,7 +297,8 @@ nsSVGOuterSVGFrame::GetIntrinsicRatio()
     if (viewBoxHeight < 0.0f) {
       viewBoxHeight = 0.0f;
     }
-    return nsSize(viewBoxWidth, viewBoxHeight);
+    return nsSize(NSToCoordRoundWithClamp(viewBoxWidth),
+                  NSToCoordRoundWithClamp(viewBoxHeight));
   }
 
   return nsSVGOuterSVGFrameBase::GetIntrinsicRatio();