[SVG2] Make transform, gradientTransform and patternTransform presentation attributes.

Source/core/svg/SVGElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Alp Toker <alp@atoker.com>
  * Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
  *
  * 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 1173 matching lines @@
 #endif
     Element::trace(visitor);
 }
 
 const AtomicString& SVGElement::eventParameterName()
 {
     DEFINE_STATIC_LOCAL(const AtomicString, evtString, ("evt", AtomicString::ConstructFromLiteral));
     return evtString;
 }
 
+bool SVGElement::getStyleTransform(AffineTransform& matrix) const
+{
+    RenderStyle* style = renderer() ? renderer()->style() : 0;
+    if (style && style->hasTransform()) {
+        TransformationMatrix transform;
+        float zoom = style->effectiveZoom();
+
+        // CSS transforms operate with pre-scaled lengths. To make this work with SVG
+        // (which applies the zoom factor globally, at the root level) we
+        //
+        //   * pre-scale the bounding box (to bring it into the same space as the other CSS values)
+        //   * invert the zoom factor (to effectively compute the CSS transform under a 1.0 zoom)
+        //
+        // Note: objectBoundingBox is an emptyRect for elements like pattern or clipPath.
+        // See the "Object bounding box units" section of http://dev.w3.org/csswg/css3-transforms/
+        if (zoom != 1) {
+            FloatRect scaledBBox = renderer()->objectBoundingBox();
+            scaledBBox.scale(zoom);
+            transform.scale(1 / zoom);
+            style->applyTransform(transform, scaledBBox);
+            transform.scale(zoom);
+        } else {
+            style->applyTransform(transform, renderer()->objectBoundingBox());
+        }
+
+        // Flatten any 3D transform.
+        matrix = transform.toAffineTransform();
+        return true;
+    }
+    return false;
 }
+
+}