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

src/effects/gradients/SkTwoPointConicalGradient.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkTwoPointConicalGradient.h"
 
 #include "SkTwoPointConicalGradient_gpu.h"
@@ skipping 203 matching lines @@
     // Because areas outside the cone are left untouched, we cannot treat the
     // shader as opaque even if the gradient itself is opaque.
     // TODO(junov): Compute whether the cone fills the plane crbug.com/222380
     return false;
 }
 
 size_t SkTwoPointConicalGradient::contextSize() const {
     return sizeof(TwoPointConicalGradientContext);
 }
 
-SkShader::Context* SkTwoPointConicalGradient::createContext(
-        const SkBitmap& device, const SkPaint& paint,
-        const SkMatrix& matrix, void* storage) const {
-    if (!this->validContext(device, paint, matrix)) {
+SkShader::Context* SkTwoPointConicalGradient::createContext(const ContextRec& rec,
+                                                            void* storage) const {
+    if (!this->validContext(rec)) {
         return NULL;
     }
 
-    return SkNEW_PLACEMENT_ARGS(storage, TwoPointConicalGradientContext,
-                                (*this, device, paint, matrix));
+    return SkNEW_PLACEMENT_ARGS(storage, TwoPointConicalGradientContext, (*this, rec));
 }
 
 SkTwoPointConicalGradient::TwoPointConicalGradientContext::TwoPointConicalGradientContext(
-        const SkTwoPointConicalGradient& shader, const SkBitmap& device,
-        const SkPaint& paint, const SkMatrix& matrix)
-    : INHERITED(shader, device, paint, matrix)
+        const SkTwoPointConicalGradient& shader, const ContextRec& rec)
+    : INHERITED(shader, rec)
 {
     // we don't have a span16 proc
     fFlags &= ~kHasSpan16_Flag;
 
     // in general, we might discard based on computed-radius, so clear
     // this flag (todo: sometimes we can detect that we never discard...)
     fFlags &= ~kOpaqueAlpha_Flag;
 }
 
 void SkTwoPointConicalGradient::TwoPointConicalGradientContext::shadeSpan(
@@ skipping 172 matching lines @@
     str->appendScalar(fCenter2.fY);
     str->append(") radius2: ");
     str->appendScalar(fRadius2);
     str->append(" ");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif