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

include/core/SkEmptyShader.h

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 
 #ifndef SkEmptyShader_DEFINED
 #define SkEmptyShader_DEFINED
 
 #include "SkShader.h"
 
 /**
  *  \class SkEmptyShader
  *  A Shader that always draws nothing. Its createContext always returns NULL.
  */
 class SK_API SkEmptyShader : public SkShader {
 public:
     SkEmptyShader() {}
 
     virtual size_t contextSize() const SK_OVERRIDE {
         // Even though createContext returns NULL we have to return a value of at least
         // sizeof(SkShader::Context) to satisfy SkSmallAllocator.
         return sizeof(SkShader::Context);
     }
 
-    virtual bool validContext(const SkBitmap&, const SkPaint&,
-                              const SkMatrix&, SkMatrix* totalInverse = NULL) const SK_OVERRIDE {
+    virtual bool validContext(const ContextRec&, SkMatrix* totalInverse = NULL) const SK_OVERRIDE {
         return false;
     }
 
-    virtual SkShader::Context* createContext(const SkBitmap&, const SkPaint&,
-                                             const SkMatrix&, void*) const SK_OVERRIDE {
+    virtual SkShader::Context* createContext(const ContextRec&, void*) const SK_OVERRIDE {
         // validContext returns false.
         return NULL;
     }
 
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkEmptyShader)
 
 protected:
     SkEmptyShader(SkReadBuffer& buffer) : INHERITED(buffer) {}
 
 private:
     typedef SkShader INHERITED;
 };
 
 #endif