Return vertical writing mode aware intrinsic information for SVG

Source/core/layout/svg/LayoutSVGRoot.cpp

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2007, 2008, 2009 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 56 matching lines @@
     // The intrinsic aspect ratio of the viewport of SVG content is necessary for example, when including SVG from an 'object'
     // element in HTML styled with CSS. It is possible (indeed, common) for an SVG graphic to have an intrinsic aspect ratio but
     // not to have an intrinsic width or height. The intrinsic aspect ratio must be calculated based upon the following rules:
     // - The aspect ratio is calculated by dividing a width by a height.
     // - If the 'width' and 'height' of the rootmost 'svg' element are both specified with unit identifiers (in, mm, cm, pt, pc,
     //   px, em, ex) or in user units, then the aspect ratio is calculated from the 'width' and 'height' attributes after
     //   resolving both values to user units.
     intrinsicSize.setWidth(floatValueForLength(svg->intrinsicWidth(), 0));
     intrinsicSize.setHeight(floatValueForLength(svg->intrinsicHeight(), 0));
 
+    if (!isHorizontalWritingMode())
+        intrinsicSize = intrinsicSize.transposedSize();
+
     if (!intrinsicSize.isEmpty()) {
         intrinsicRatio = intrinsicSize.width() / static_cast<double>(intrinsicSize.height());
     } else {
         // - If either/both of the 'width' and 'height' of the rootmost 'svg' element are in percentage units (or omitted), the
         //   aspect ratio is calculated from the width and height values of the 'viewBox' specified for the current SVG document
         //   fragment. If the 'viewBox' is not correctly specified, or set to 'none', the intrinsic aspect ratio cannot be
         //   calculated and is considered unspecified.
         FloatSize viewBoxSize = svg->viewBox()->currentValue()->value().size();
         if (!viewBoxSize.isEmpty()) {
             // The viewBox can only yield an intrinsic ratio, not an intrinsic size.
             intrinsicRatio = viewBoxSize.width() / static_cast<double>(viewBoxSize.height());
+            if (!isHorizontalWritingMode())
+                intrinsicRatio = 1 / intrinsicRatio;
         }
     }
 }
 
 bool LayoutSVGRoot::isEmbeddedThroughSVGImage() const
 {
     return SVGImage::isInSVGImage(toSVGSVGElement(node()));
 }
 
 bool LayoutSVGRoot::isEmbeddedThroughFrameContainingSVGDocument() const
@@ skipping 329 matching lines @@
             updateHitTestResult(result, pointInBorderBox);
             if (!result.addNodeToListBasedTestResult(node(), locationInContainer, boundsRect))
                 return true;
         }
     }
 
     return false;
 }
 
 }