expand unitests for color4f

include/core/SkShader.h

 /*
  * Copyright 2006 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 SkShader_DEFINED
 #define SkShader_DEFINED
 
@@ skipping 103 matching lines @@
 
         /**
          *  Called sometimes before drawing with this shader. Return the type of
          *  alpha your shader will return. The default implementation returns 0.
          *  Your subclass should override if it can (even sometimes) report a
          *  non-zero value, since that will enable various blitters to perform
          *  faster.
          */
         virtual uint32_t getFlags() const { return 0; }
 
+        bool supports4f() const {
+            return SkToBool(this->getFlags() & kSupports4f_Flag);
+        }
+
         /**
          *  Called for each span of the object being drawn. Your subclass should
          *  set the appropriate colors (with premultiplied alpha) that correspond
          *  to the specified device coordinates.
          */
         virtual void shadeSpan(int x, int y, SkPMColor[], int count) = 0;
 
         virtual void shadeSpan4f(int x, int y, SkPM4f[], int count);
 
         /**
@@ skipping 276 matching lines @@
     SkMatrix fLocalMatrix;
 
     // So the SkLocalMatrixShader can whack fLocalMatrix in its SkReadBuffer constructor.
     friend class SkLocalMatrixShader;
     friend class SkBitmapProcShader;    // for computeTotalInverse()
 
     typedef SkFlattenable INHERITED;
 };
 
 #endif