Bug 769902 - Avoid unnecessary precision issues in nsSVGUtils::ObjectSpace. r=longsonr.

layout/svg/base/src/nsSVGUtils.cpp

@@ -831,7 +831,7 @@ nsSVGUtils::ComputeNormalizedHypotenuse(double aWidth, double aHeight)
 float
 nsSVGUtils::ObjectSpace(const gfxRect &aRect, const nsSVGLength2 *aLength)
 {
-  float fraction, axis;
+  float axis;
 
   switch (aLength->GetCtxType()) {
   case X:
@@ -848,15 +848,11 @@ nsSVGUtils::ObjectSpace(const gfxRect &aRect, const nsSVGLength2 *aLength)
     axis = 0.0f;
     break;
   }
-
   if (aLength->IsPercentage()) {
-    fraction = aLength->GetAnimValInSpecifiedUnits() / 100;
-  } else {
-    fraction = aLength->GetAnimValue(static_cast<nsSVGSVGElement*>
-                                                (nsnull));
+    // Multiply first to avoid precision errors:
+    return axis * aLength->GetAnimValInSpecifiedUnits() / 100;
   }
-
-  return fraction * axis;
+  return aLength->GetAnimValue(static_cast<nsSVGSVGElement*>(nsnull)) * axis;
 }
 
 float