Support currentTransform in 2D Canvas.

Source/core/html/canvas/CanvasRenderingContext2D.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2011, 2012 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 18 matching lines @@
 #include "core/html/canvas/Canvas2DContextAttributes.h"
 #include "core/html/canvas/CanvasPathMethods.h"
 #include "core/html/canvas/CanvasRenderingContext.h"
 #include "core/platform/graphics/Color.h"
 #include "core/platform/graphics/FloatSize.h"
 #include "core/platform/graphics/Font.h"
 #include "core/platform/graphics/GraphicsTypes.h"
 #include "core/platform/graphics/ImageBuffer.h"
 #include "core/platform/graphics/Path.h"
 #include "core/platform/graphics/transforms/AffineTransform.h"
+#include "core/svg/SVGMatrix.h"
+#include "core/svg/properties/SVGPropertyTearOff.h"
 #include "wtf/HashMap.h"
 #include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebKit { class WebLayer; }
 
 namespace WebCore {
 
 class CanvasGradient;
 class CanvasPattern;
@@ skipping 61 matching lines @@
 
     float globalAlpha() const;
     void setGlobalAlpha(float);
 
     String globalCompositeOperation() const;
     void setGlobalCompositeOperation(const String&);
 
     void save() { ++m_unrealizedSaveCount; }
     void restore();
 
+    // TODO(dshwang): Need to clean up currentTransform binding methods via improving binding generator script.
+    // The binding code generated by 'attribute SVGMatix foo' in idl requires foo() and updateFoo(),
+    // because SVGTransform.idl needs to return the reference of SVGMatrix.
+    // When JS changes the return value, SVGTransform is applied immediately.
+    // However, CanvanRenderingContext2D doesn't need the implicit update.
+    // So updateCurrentTransform() does nothing.
+    SVGMatrix& currentTransform()
+    {
+        m_dummyCurrentTransform = SVGMatrix(state().m_transform);
+        return m_dummyCurrentTransform;
+    }
+    void updateCurrentTransform() { }
+    void setCurrentTransform(SVGPropertyTearOff<SVGMatrix>*, ExceptionState&);
+
     void scale(float sx, float sy);
     void rotate(float angleInRadians);
     void translate(float tx, float ty);
     void transform(float m11, float m12, float m21, float m22, float dx, float dy);
     void setTransform(float m11, float m12, float m21, float m22, float dx, float dy);
     void resetTransform();
 
     void setStrokeColor(const String& color);
     void setStrokeColor(float grayLevel);
     void setStrokeColor(const String& color, float alpha);
@@ skipping 193 matching lines @@
 
     virtual bool isTransformInvertible() const { return state().m_invertibleCTM; }
 
     virtual WebKit::WebLayer* platformLayer() const OVERRIDE;
 
     Vector<State, 1> m_stateStack;
     unsigned m_unrealizedSaveCount;
     bool m_usesCSSCompatibilityParseMode;
     bool m_hasAlpha;
     MutableStylePropertyMap m_fetchedFonts;
+    SVGMatrix m_dummyCurrentTransform;
 };
 
 } // namespace WebCore
 
 #endif