create struct to hold all the params passed around for shader::context

src/effects/gradients/SkTwoPointRadialGradient.h

 
 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
  #ifndef SkTwoPointRadialGradient_DEFINED
  #define SkTwoPointRadialGradient_DEFINED
 
  #include "SkGradientShaderPriv.h"
 
 class SkTwoPointRadialGradient : public SkGradientShaderBase {
 public:
     SkTwoPointRadialGradient(const SkPoint& start, SkScalar startRadius,
                               const SkPoint& end, SkScalar endRadius,
                               const Descriptor&, const SkMatrix* localMatrix);
 
     virtual BitmapType asABitmap(SkBitmap* bitmap,
                                  SkMatrix* matrix,
                                  TileMode* xy) const SK_OVERRIDE;
     virtual GradientType asAGradient(GradientInfo* info) const SK_OVERRIDE;
     virtual GrEffectRef* asNewEffect(GrContext* context, const SkPaint&) const SK_OVERRIDE;
 
-
     virtual size_t contextSize() const SK_OVERRIDE;
-    virtual bool validContext(const SkBitmap&, const SkPaint&,
-                              const SkMatrix&, SkMatrix* totalInverse = NULL) const SK_OVERRIDE;
-    virtual SkShader::Context* createContext(const SkBitmap&, const SkPaint&, const SkMatrix&,
-                                             void* storage) const SK_OVERRIDE;
+    virtual bool validContext(const ContextRec&, SkMatrix* totalInverse) const SK_OVERRIDE;
+    virtual SkShader::Context* createContext(const ContextRec&, void* storage) const SK_OVERRIDE;
 
     class TwoPointRadialGradientContext : public SkGradientShaderBase::GradientShaderBaseContext {
     public:
-        TwoPointRadialGradientContext(const SkTwoPointRadialGradient& shader,
-                                      const SkBitmap& device,
-                                      const SkPaint& paint,
-                                      const SkMatrix& matrix);
-        ~TwoPointRadialGradientContext() {}
+        TwoPointRadialGradientContext(const SkTwoPointRadialGradient&, const ContextRec&);
 
         virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count) SK_OVERRIDE;
 
     private:
         typedef SkGradientShaderBase::GradientShaderBaseContext INHERITED;
     };
 
     SkScalar getCenterX1() const { return fDiff.length(); }
     SkScalar getStartRadius() const { return fStartRadius; }
     SkScalar getDiffRadius() const { return fDiffRadius; }
@@ skipping 12 matching lines @@
     const SkScalar fRadius2;
     SkPoint fDiff;
     SkScalar fStartRadius, fDiffRadius, fSr2D2, fA, fOneOverTwoA;
 
     void init();
 
     typedef SkGradientShaderBase INHERITED;
 };
 
 #endif