sknx refactoring

src/opts/SkXfermode_opts.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef Sk4pxXfermode_DEFINED
 #define Sk4pxXfermode_DEFINED
 
@@ skipping 104 matching lines @@
 // Some xfermodes use math like divide or sqrt that's best done in floats 1 pixel at a time.
 #define XFERMODE(Xfermode) \
     struct Xfermode { Sk4f operator()(const Sk4f&, const Sk4f&) const; }; \
     inline Sk4f Xfermode::operator()(const Sk4f& d, const Sk4f& s) const
 
 static inline Sk4f a_rgb(const Sk4f& a, const Sk4f& rgb) {
     static_assert(SK_A32_SHIFT == 24, "");
     return a * Sk4f(0,0,0,1) + rgb * Sk4f(1,1,1,0);
 }
 static inline Sk4f alphas(const Sk4f& f) {
-    return SkNx_dup<SK_A32_SHIFT/8>(f);
+    return f.kth<SK_A32_SHIFT/8>();
 }
 
 XFERMODE(ColorDodge) {
     auto sa = alphas(s),
          da = alphas(d),
          isa = Sk4f(1)-sa,
          ida = Sk4f(1)-da;
 
     auto srcover = s + d*isa,
          dstover = d + s*ida,
@@ skipping 215 matching lines @@
     #undef CASE
 
         default: break;
     }
     return nullptr;
 }
 
 } // namespace SK_OPTS_NS
 
 #endif//Sk4pxXfermode_DEFINED