generalize xferu64 procs using proc4f

include/core/SkXfermode.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 SkXfermode_DEFINED
@@ skipping 128 matching lines @@
     /** Return an SkXfermode object for the specified mode.
      */
     static SkXfermode* Create(Mode mode);
 
     /** Return a function pointer to a routine that applies the specified
         porter-duff transfer mode.
      */
     static SkXfermodeProc GetProc(Mode mode);
     static SkXfermodeProc4f GetProc4f(Mode);
 
+    virtual SkXfermodeProc4f getProc4f() const;
+
     /**
      *  If the specified mode can be represented by a pair of Coeff, then return
      *  true and set (if not NULL) the corresponding coeffs. If the mode is
      *  not representable as a pair of Coeffs, return false and ignore the
      *  src and dst parameters.
      */
     static bool ModeAsCoeff(Mode mode, Coeff* src, Coeff* dst);
 
     SK_ATTR_DEPRECATED("use AsMode(...)")
     static bool IsMode(const SkXfermode* xfer, Mode* mode) {
@@ skipping 103 matching lines @@
 
 private:
     enum {
         kModeCount = kLastMode + 1
     };
 
     typedef SkFlattenable INHERITED;
 };
 
 #endif