Consider conical shader opaque if it covers entire plane.

src/effects/gradients/SkTwoPointConicalGradient.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 SkTwoPointConicalGradient_DEFINED
  #define SkTwoPointConicalGradient_DEFINED
 
 #include "SkGradientShaderPriv.h"
 
 struct TwoPtRadial {
     enum {
         kDontDrawT  = 0x80000000
     };
 
     float   fCenterX, fCenterY;
     float   fDCenterX, fDCenterY;
     float   fRadius;
     float   fDRadius;
     float   fA;
     float   fRadius2;
     float   fRDR;
+    bool    fConeFillsPlane;
 
     void init(const SkPoint& center0, SkScalar rad0,
               const SkPoint& center1, SkScalar rad1);
 
     // used by setup and nextT
     float   fRelX, fRelY, fIncX, fIncY;
     float   fB, fDB;
 
     void setup(SkScalar fx, SkScalar fy, SkScalar dfx, SkScalar dfy);
     SkFixed nextT();
@@ skipping 39 matching lines @@
 
 private:
     typedef SkGradientShaderBase INHERITED;
     const SkPoint fCenter1;
     const SkPoint fCenter2;
     const SkScalar fRadius1;
     const SkScalar fRadius2;
 };
 
 #endif