2 files changed, 16 insertions, 24 deletions
diff --git a/layout/svg/nsSVGOuterSVGFrame.cpp b/layout/svg/nsSVGOuterSVGFrame.cpp
index 16dfc2b37..3f68245e2 100644
--- a/layout/svg/nsSVGOuterSVGFrame.cpp
+++ b/layout/svg/nsSVGOuterSVGFrame.cpp
@@ -232,28 +232,30 @@ nsSVGOuterSVGFrame::GetIntrinsicSize()
   return intrinsicSize;
 }
 
-/* virtual */ nsSize
+/* virtual */ AspectRatio
 nsSVGOuterSVGFrame::GetIntrinsicRatio()
-{
+{ 
+ // When 'contain: size' is implemented, make sure to check for it.
+/*
+  if (this->GetContent->GetParent() && this->StyleDisplay()->IsContainSize()) {
+    return AspectRatio();
+  }
+ */
+
   // We only have an intrinsic size/ratio if our width and height attributes
   // are both specified and set to non-percentage values, or we have a viewBox
   // rect: http://www.w3.org/TR/SVGMobile12/coords.html#IntrinsicSizing
+  // Unfortunately we have to return the ratio as two nscoords whereas what
+  // we have are two floats. Using app units allows for some floating point
+  // values to work but really small or large numbers will fail.
 
   SVGSVGElement *content = static_cast<SVGSVGElement*>(mContent);
   nsSVGLength2 &width  = content->mLengthAttributes[SVGSVGElement::ATTR_WIDTH];
   nsSVGLength2 &height = content->mLengthAttributes[SVGSVGElement::ATTR_HEIGHT];
 
   if (!width.IsPercentage() && !height.IsPercentage()) {
-    nsSize ratio(
-      nsPresContext::CSSPixelsToAppUnits(width.GetAnimValue(content)),
-      nsPresContext::CSSPixelsToAppUnits(height.GetAnimValue(content)));
-    if (ratio.width < 0) {
-      ratio.width = 0;
-    }
-    if (ratio.height < 0) {
-      ratio.height = 0;
-    }
-    return ratio;
+    return AspectRatio::FromSize(width.GetAnimValue(content),
+                                 height.GetAnimValue(content));
   }
 
   SVGViewElement* viewElement = content->GetCurrentViewElement();
@@ -267,17 +269,7 @@ nsSVGOuterSVGFrame::GetIntrinsicRatio()
   }
 
   if (viewbox) {
-    float viewBoxWidth = viewbox->width;
-    float viewBoxHeight = viewbox->height;
-
-    if (viewBoxWidth < 0.0f) {
-      viewBoxWidth = 0.0f;
-    }
-    if (viewBoxHeight < 0.0f) {
-      viewBoxHeight = 0.0f;
-    }
-    return nsSize(nsPresContext::CSSPixelsToAppUnits(viewBoxWidth),
-                  nsPresContext::CSSPixelsToAppUnits(viewBoxHeight));
+    return AspectRatio::FromSize(viewbox->width, viewbox->height);
   }
 
   return nsSVGDisplayContainerFrame::GetIntrinsicRatio();
diff --git a/layout/svg/nsSVGOuterSVGFrame.h b/layout/svg/nsSVGOuterSVGFrame.h
index ee59b7d1c..4705b6ebe 100644
--- a/layout/svg/nsSVGOuterSVGFrame.h
+++ b/layout/svg/nsSVGOuterSVGFrame.h
@@ -42,7 +42,7 @@ public:
   virtual nscoord GetPrefISize(nsRenderingContext *aRenderingContext) override;
 
   virtual mozilla::IntrinsicSize GetIntrinsicSize() override;
-  virtual nsSize  GetIntrinsicRatio() override;
+  virtual mozilla::AspectRatio GetIntrinsicRatio() override;
 
   virtual mozilla::LogicalSize
   ComputeSize(nsRenderingContext *aRenderingContext,