Issue #1619 - Convert Intrinsic Ratio to Float

https://bugzilla.mozilla.org/show_bug.cgi?id=1547792

Aspect Ratio handling simplified by using floating point integers:
- Multiplication of value (or inverse value) to a known side for Scaling
- No unequal equal values such as "4/3" vs "8/6" vs "20/15"
- Truly "Empty" aspect ratios, even if one dimension is not 0

image/ClippedImage.cpp

@@ -242,13 +242,13 @@ ClippedImage::GetIntrinsicSize(nsSize* aSize)
 }
 
 NS_IMETHODIMP
-ClippedImage::GetIntrinsicRatio(nsSize* aRatio)
+ClippedImage::GetIntrinsicRatio(AspectRatio* aRatio)
 {
   if (!ShouldClip()) {
     return InnerImage()->GetIntrinsicRatio(aRatio);
   }
 
-  *aRatio = nsSize(mClip.width, mClip.height);
+  *aRatio = AspectRatio::FromSize(mClip.width, mClip.height);
   return NS_OK;
 }
 

image/ClippedImage.h

@@ -35,7 +35,7 @@ public:
   NS_IMETHOD GetWidth(int32_t* aWidth) override;
   NS_IMETHOD GetHeight(int32_t* aHeight) override;
   NS_IMETHOD GetIntrinsicSize(nsSize* aSize) override;
-  NS_IMETHOD GetIntrinsicRatio(nsSize* aRatio) override;
+  NS_IMETHOD GetIntrinsicRatio(AspectRatio* aRatio) override;
   NS_IMETHOD_(already_AddRefed<SourceSurface>)
     GetFrame(uint32_t aWhichFrame, uint32_t aFlags) override;
   NS_IMETHOD_(already_AddRefed<SourceSurface>)

image/DynamicImage.cpp

@@ -136,10 +136,10 @@ DynamicImage::GetIntrinsicSize(nsSize* aSize)
 }
 
 NS_IMETHODIMP
-DynamicImage::GetIntrinsicRatio(nsSize* aSize)
+DynamicImage::GetIntrinsicRatio(AspectRatio* aRatio)
 {
-  IntSize intSize(mDrawable->Size());
-  *aSize = nsSize(intSize.width, intSize.height);
+  auto size = mDrawable->Size();
+  *aRatio = AspectRatio::FromSize(size);
   return NS_OK;
 }
 

image/ImageWrapper.cpp

@@ -146,9 +146,9 @@ ImageWrapper::GetIntrinsicSize(nsSize* aSize)
 }
 
 NS_IMETHODIMP
-ImageWrapper::GetIntrinsicRatio(nsSize* aSize)
+ImageWrapper::GetIntrinsicRatio(AspectRatio* aRatio)
 {
-  return mInnerImage->GetIntrinsicRatio(aSize);
+  return mInnerImage->GetIntrinsicRatio(aRatio);
 }
 
 NS_IMETHODIMP_(Orientation)

image/OrientedImage.cpp

@@ -59,12 +59,12 @@ OrientedImage::GetIntrinsicSize(nsSize* aSize)
 }
 
 NS_IMETHODIMP
-OrientedImage::GetIntrinsicRatio(nsSize* aRatio)
+OrientedImage::GetIntrinsicRatio(AspectRatio* aRatio)
 {
   nsresult rv = InnerImage()->GetIntrinsicRatio(aRatio);
 
   if (mOrientation.SwapsWidthAndHeight()) {
-    swap(aRatio->width, aRatio->height);
+    *aRatio = aRatio->Inverted();
   }
 
   return rv;

image/OrientedImage.h

@@ -31,7 +31,7 @@ public:
   NS_IMETHOD GetWidth(int32_t* aWidth) override;
   NS_IMETHOD GetHeight(int32_t* aHeight) override;
   NS_IMETHOD GetIntrinsicSize(nsSize* aSize) override;
-  NS_IMETHOD GetIntrinsicRatio(nsSize* aRatio) override;
+  NS_IMETHOD GetIntrinsicRatio(AspectRatio* aRatio) override;
   NS_IMETHOD_(already_AddRefed<SourceSurface>)
     GetFrame(uint32_t aWhichFrame, uint32_t aFlags) override;
   NS_IMETHOD_(already_AddRefed<SourceSurface>)

image/RasterImage.cpp

@@ -240,13 +240,14 @@ RasterImage::GetIntrinsicSize(nsSize* aSize)
 
 //******************************************************************************
 NS_IMETHODIMP
-RasterImage::GetIntrinsicRatio(nsSize* aRatio)
+RasterImage::GetIntrinsicRatio(AspectRatio* aRatio)
 {
   if (mError) {
     return NS_ERROR_FAILURE;
   }
 
-  *aRatio = nsSize(mSize.width, mSize.height);
+  *aRatio = AspectRatio::FromSize(mSize);
+
   return NS_OK;
 }
 

image/VectorImage.cpp

@@ -628,7 +628,7 @@ VectorImage::GetIntrinsicSize(nsSize* aSize)
 
 //******************************************************************************
 NS_IMETHODIMP
-VectorImage::GetIntrinsicRatio(nsSize* aRatio)
+VectorImage::GetIntrinsicRatio(AspectRatio* aRatio)
 {
   if (mError || !mIsFullyLoaded) {
     return NS_ERROR_FAILURE;

image/imgIContainer.idl

@@ -12,6 +12,7 @@
 #include "gfxMatrix.h"
 #include "gfxRect.h"
 #include "mozilla/gfx/2D.h"
+#include "mozilla/AspectRatio.h"
 #include "mozilla/Maybe.h"
 #include "mozilla/RefPtr.h"
 #include "nsRect.h"
@@ -55,6 +56,7 @@ native SamplingFilter(mozilla::gfx::SamplingFilter);
 native nsIntRectByVal(nsIntRect);
 [ref] native nsIntSize(nsIntSize);
 native nsSize(nsSize);
+native AspectRatio(mozilla::AspectRatio);
 [ptr] native nsIFrame(nsIFrame);
 native TempRefImageContainer(already_AddRefed<mozilla::layers::ImageContainer>);
 [ref] native ImageRegion(mozilla::image::ImageRegion);
@@ -101,7 +103,7 @@ interface imgIContainer : nsISupports
    * The (dimensionless) intrinsic ratio of this image. In the case of any
    * error, an exception will be thrown.
    */
-  [noscript] readonly attribute nsSize intrinsicRatio;
+  [noscript] readonly attribute AspectRatio intrinsicRatio;
 
   /**
    * Given a size at which this image will be displayed, and the drawing