Split Gradient impl into separate classes

third_party/WebKit/Source/modules/canvas2d/CanvasGradient.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  *
  * 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
@@ skipping 16 matching lines @@
 #include "modules/canvas2d/CanvasGradient.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "core/dom/ExceptionCode.h"
 #include "modules/canvas2d/CanvasPattern.h"
 #include "modules/canvas2d/CanvasStyle.h"
 
 namespace blink {
 
 CanvasGradient::CanvasGradient(const FloatPoint& p0, const FloatPoint& p1)
-    : m_gradient(Gradient::create(p0, p1)) {}
+    : m_gradient(Gradient::createLinear(p0, p1)), m_isZeroSize(p0 == p1) {}
 
 CanvasGradient::CanvasGradient(const FloatPoint& p0,
                                float r0,
                                const FloatPoint& p1,
                                float r1)
-    : m_gradient(Gradient::create(p0, r0, p1, r1)) {}
+    : m_gradient(Gradient::createRadial(p0, r0, p1, r1)),
+      m_isZeroSize(p0 == p1 && r0 == r1) {}
 
 void CanvasGradient::addColorStop(float value,
                                   const String& colorString,
                                   ExceptionState& exceptionState) {
   if (!(value >= 0 && value <= 1.0f)) {
     exceptionState.throwDOMException(
         IndexSizeError, "The provided value (" + String::number(value) +
                             ") is outside the range (0.0, 1.0).");
     return;
   }
 
   Color color = 0;
   if (!parseColorOrCurrentColor(color, colorString, 0 /*canvas*/)) {
     exceptionState.throwDOMException(SyntaxError,
                                      "The value provided ('" + colorString +
                                          "') could not be parsed as a color.");
     return;
   }
 
   m_gradient->addColorStop(value, color);
 }
 
 }  // namespace blink