Add null check to fill, stroke, clip method

Source/core/html/canvas/CanvasRenderingContext2D.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  * Copyright (C) 2012, 2013 Intel Corporation. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
  *
@@ skipping 914 matching lines @@
     }
 
     c->setFillRule(windRule);
 }
 
 void CanvasRenderingContext2D::fill(const String& windingRuleString)
 {
     fillInternal(m_path, windingRuleString);
 }
 
-void CanvasRenderingContext2D::fill(DOMPath* domPath, const String& windingRuleString)
+void CanvasRenderingContext2D::fill(DOMPath* domPath, ExceptionState& exceptionState)
 {
+    fill(domPath, "nonzero", exceptionState);
+}
+
+void CanvasRenderingContext2D::fill(DOMPath* domPath, const String& windingRuleString, ExceptionState& exceptionState)
+{
+    if (!domPath) {
+        exceptionState.throwDOMException(TypeMismatchError, ExceptionMessages::argumentNullOrIncorrectType(1, "Path"));
+        return;
+    }
+
     fillInternal(domPath->path(), windingRuleString);
 }
 
 void CanvasRenderingContext2D::strokeInternal(const Path& path)
 {
     if (path.isEmpty()) {
         return;
     }
     GraphicsContext* c = drawingContext();
     if (!c) {
@@ skipping 16 matching lines @@
         c->strokePath(path);
         didDraw(dirtyRect);
     }
 }
 
 void CanvasRenderingContext2D::stroke()
 {
     strokeInternal(m_path);
 }
 
-void CanvasRenderingContext2D::stroke(DOMPath* domPath)
+void CanvasRenderingContext2D::stroke(DOMPath* domPath, ExceptionState& exceptionState)
 {
+    if (!domPath) {
+        exceptionState.throwDOMException(TypeMismatchError, ExceptionMessages::argumentNullOrIncorrectType(1, "Path"));
+        return;
+    }
+
     strokeInternal(domPath->path());
 }
 
 void CanvasRenderingContext2D::clipInternal(const Path& path, const String& windingRuleString)
 {
     GraphicsContext* c = drawingContext();
     if (!c) {
         return;
     }
     if (!state().m_invertibleCTM) {
         return;
     }
 
     WindRule newWindRule = RULE_NONZERO;
     if (!parseWinding(windingRuleString, newWindRule)) {
         return;
     }
 
     realizeSaves();
     c->canvasClip(path, newWindRule);
 }
 
 void CanvasRenderingContext2D::clip(const String& windingRuleString)
 {
     clipInternal(m_path, windingRuleString);
 }
 
-void CanvasRenderingContext2D::clip(DOMPath* domPath, const String& windingRuleString)
+void CanvasRenderingContext2D::clip(DOMPath* domPath, ExceptionState& exceptionState)
 {
+    clip(domPath, "nonzero", exceptionState);
+}
+
+void CanvasRenderingContext2D::clip(DOMPath* domPath, const String& windingRuleString, ExceptionState& exceptionState)
+{
+    if (!domPath) {
+        exceptionState.throwDOMException(TypeMismatchError, ExceptionMessages::argumentNullOrIncorrectType(1, "Path"));
+        return;
+    }
+
     clipInternal(domPath->path(), windingRuleString);
 }
 
 bool CanvasRenderingContext2D::isPointInPath(const float x, const float y, const String& windingRuleString)
 {
     GraphicsContext* c = drawingContext();
     if (!c)
         return false;
     if (!state().m_invertibleCTM)
         return false;
@@ skipping 1430 matching lines @@
     const int focusRingWidth = 5;
     const int focusRingOutline = 0;
     c->drawFocusRing(path, focusRingWidth, focusRingOutline, focusRingColor);
 
     c->restore();
 
     didDraw(dirtyRect);
 }
 
 } // namespace WebCore