Add support for the object-fit CSS property.

Source/core/platform/graphics/LayoutSize.h

 /*
  * Copyright (c) 2012, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 21 matching lines @@
 #define LayoutSize_h
 
 #include "core/platform/LayoutUnit.h"
 #include "core/platform/graphics/FloatSize.h"
 #include "core/platform/graphics/IntSize.h"
 
 namespace WebCore {
 
 class LayoutPoint;
 
+enum AspectRatioFit {
+    AspectRatioFitShrink,
+    AspectRatioFitGrow
+};
+
 class LayoutSize {
 public:
     LayoutSize() : m_width(0), m_height(0) { }
     LayoutSize(const IntSize& size) : m_width(size.width()), m_height(size.height()) { }
     LayoutSize(LayoutUnit width, LayoutUnit height) : m_width(width), m_height(height) { }
 
     explicit LayoutSize(const FloatSize& size) : m_width(size.width()), m_height(size.height()) { }
 
     LayoutUnit width() const { return m_width; }
     LayoutUnit height() const { return m_height; }
@@ skipping 53 matching lines @@
             m_width = minimumSize.width();
         if (m_height < minimumSize.height())
             m_height = minimumSize.height();
     }
 
     LayoutSize transposedSize() const
     {
         return LayoutSize(m_height, m_width);
     }
 
+    LayoutSize fitToAspectRatio(const LayoutSize& aspectRatio, AspectRatioFit fit) const
+    {
+        float heightScale = height().toFloat() / aspectRatio.height().toFloat();
+        float widthScale = width().toFloat() / aspectRatio.width().toFloat();
+        if ((widthScale > heightScale) != (fit == AspectRatioFitGrow))
+            return LayoutSize(height() * aspectRatio.width() / aspectRatio.height(), height());
+        return LayoutSize(width(), width() * aspectRatio.height() / aspectRatio.width());
+    }
+
 private:
     LayoutUnit m_width, m_height;
 };
 
 inline LayoutSize& operator+=(LayoutSize& a, const LayoutSize& b)
 {
     a.setWidth(a.width() + b.width());
     a.setHeight(a.height() + b.height());
     return a;
 }
@@ skipping 41 matching lines @@
 }
 
 inline LayoutSize roundedLayoutSize(const FloatSize& s)
 {
     return LayoutSize(s);
 }
 
 } // namespace WebCore
 
 #endif // LayoutSize_h