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

include/core/SkColorShader.h

 
 /*
  * Copyright 2007 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkColorShader_DEFINED
 #define SkColorShader_DEFINED
 
 #include "SkShader.h"
 
 /** \class SkColorShader
     A Shader that represents a single color. In general, this effect can be
     accomplished by just using the color field on the paint, but if an
     actual shader object is needed, this provides that feature.
 */
 class SK_API SkColorShader : public SkShader {
 public:
     /** Create a ColorShader that ignores the color in the paint, and uses the
         specified color. Note: like all shaders, at draw time the paint's alpha
         will be respected, and is applied to the specified color.
     */
     explicit SkColorShader(SkColor c);
 
     virtual bool isOpaque() const SK_OVERRIDE;
 
-    virtual SkShader::Context* createContext(const SkBitmap& device,
-                                             const SkPaint& paint,
-                                             const SkMatrix& matrix,
-                                             void* storage) const SK_OVERRIDE;
+    virtual SkShader::Context* createContext(const ContextRec&, void* storage) const SK_OVERRIDE;
 
     virtual size_t contextSize() const SK_OVERRIDE {
         return sizeof(ColorShaderContext);
     }
 
     class ColorShaderContext : public SkShader::Context {
     public:
-        ColorShaderContext(const SkColorShader& shader, const SkBitmap& device,
-                           const SkPaint& paint, const SkMatrix& matrix);
+        ColorShaderContext(const SkColorShader& shader, const ContextRec&);
 
         virtual uint32_t getFlags() const SK_OVERRIDE;
         virtual uint8_t getSpan16Alpha() const SK_OVERRIDE;
         virtual void shadeSpan(int x, int y, SkPMColor span[], int count) SK_OVERRIDE;
         virtual void shadeSpan16(int x, int y, uint16_t span[], int count) SK_OVERRIDE;
         virtual void shadeSpanAlpha(int x, int y, uint8_t alpha[], int count) SK_OVERRIDE;
 
     private:
         SkPMColor   fPMColor;
         uint32_t    fFlags;
@@ skipping 16 matching lines @@
     SkColorShader(SkReadBuffer&);
     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
 
 private:
     SkColor     fColor;         // ignored if fInheritColor is true
 
     typedef SkShader INHERITED;
 };
 
 #endif