Implement basic parts of hit regions on canvas2d.

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 13 matching lines @@
  */
 
 #ifndef CanvasRenderingContext2D_h
 #define CanvasRenderingContext2D_h
 
 #include "bindings/v8/ScriptWrappable.h"
 #include "core/css/CSSFontSelectorClient.h"
 #include "core/html/canvas/Canvas2DContextAttributes.h"
 #include "core/html/canvas/CanvasPathMethods.h"
 #include "core/html/canvas/CanvasRenderingContext.h"
+#include "core/html/canvas/HitRegion.h"
 #include "core/svg/SVGMatrixTearOff.h"
 #include "platform/fonts/Font.h"
 #include "platform/graphics/Color.h"
 #include "platform/geometry/FloatSize.h"
 #include "platform/graphics/GraphicsTypes.h"
 #include "platform/graphics/ImageBuffer.h"
 #include "platform/graphics/Path.h"
 #include "platform/transforms/AffineTransform.h"
 #include "wtf/HashMap.h"
 #include "wtf/Vector.h"
@@ skipping 176 matching lines @@
     LineJoin getLineJoin() const { return state().m_lineJoin; }
 
     bool imageSmoothingEnabled() const;
     void setImageSmoothingEnabled(bool);
 
     PassRefPtr<Canvas2DContextAttributes> getContextAttributes() const;
 
     void drawFocusIfNeeded(Element*);
     void drawFocusIfNeeded(Path2D*, Element*);
 
+    void addHitRegion(ExceptionState&);
+    void addHitRegion(const Dictionary&, ExceptionState&);
+    void removeHitRegion(const String& id);
+    void clearHitRegions();
+    HitRegion* hitRegionAtPoint(const LayoutPoint&);
+    unsigned hitRegionsCount() const;
+
     void loseContext();
     void restoreContext();
 
     virtual void trace(Visitor*) OVERRIDE;
 
 private:
     class State FINAL : public CSSFontSelectorClient {
     public:
         State();
         virtual ~State();
@@ skipping 86 matching lines @@
     void inflateStrokeRect(FloatRect&) const;
 
     template<class T> void fullCanvasCompositedFill(const T&);
     template<class T> void fullCanvasCompositedStroke(const T&);
     template<class T> void fullCanvasCompositedDrawImage(T*, const FloatRect&, const FloatRect&, CompositeOperator);
 
     void drawFocusIfNeededInternal(const Path&, Element*);
     bool focusRingCallIsValid(const Path&, Element*);
     void drawFocusRing(const Path&);
 
+    void addHitRegionInternal(const HitRegionOptions&, ExceptionState&);
+
     void validateStateStack();
 
     virtual bool is2d() const OVERRIDE { return true; }
     virtual bool isAccelerated() const OVERRIDE;
     virtual bool hasAlpha() const OVERRIDE { return m_hasAlpha; }
 
     virtual bool isTransformInvertible() const OVERRIDE { return state().m_invertibleCTM; }
 
     virtual blink::WebLayer* platformLayer() const OVERRIDE;
 
     WillBeHeapVector<OwnPtrWillBeMember<State> > m_stateStack;
+    OwnPtrWillBeMember<HitRegionManager> m_hitRegionManager;
     bool m_usesCSSCompatibilityParseMode;
     bool m_hasAlpha;
     bool m_isContextLost;
     bool m_contextRestorable;
     Canvas2DContextStorage m_storageMode;
     MutableStylePropertyMap m_fetchedFonts;
     unsigned m_tryRestoreContextAttemptCount;
     Timer<CanvasRenderingContext2D> m_dispatchContextLostEventTimer;
     Timer<CanvasRenderingContext2D> m_dispatchContextRestoredEventTimer;
     Timer<CanvasRenderingContext2D> m_tryRestoreContextEventTimer;
 };
 
 DEFINE_TYPE_CASTS(CanvasRenderingContext2D, CanvasRenderingContext, context, context->is2d(), context.is2d());
 
 } // namespace WebCore
 
 #endif