3-15% speedup to HardLight / Overlay xfermodes.

src/core/Sk4px.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 Sk4px_DEFINED
 #define Sk4px_DEFINED
 
@@ skipping 52 matching lines @@
             return v.addNarrowHi(v >> 8);
         }
 
         // These just keep the types as Wide so the user doesn't have to keep casting.
         Wide operator * (const Wide& o) const { return INHERITED::operator*(o); }
         Wide operator + (const Wide& o) const { return INHERITED::operator+(o); }
         Wide operator - (const Wide& o) const { return INHERITED::operator-(o); }
         Wide operator >> (int bits) const { return INHERITED::operator>>(bits); }
         Wide operator << (int bits) const { return INHERITED::operator<<(bits); }
         static Wide Min(const Wide& a, const Wide& b) { return INHERITED::Min(a,b); }
+        Wide thenElse(const Wide& t, const Wide& e) const { return INHERITED::thenElse(t,e); }
 
     private:
         typedef Sk16h INHERITED;
     };
 
     Wide widenLo() const;               // ARGB -> 0A 0R 0G 0B
     Wide widenHi() const;               // ARGB -> A0 R0 G0 B0
+    Wide widenLoHi() const;             // ARGB -> AA RR GG BB
     Wide mulWiden(const Sk16b&) const;  // 8-bit x 8-bit -> 16-bit components.
 
     // The only 8-bit multiply we use is 8-bit x 8-bit -> 16-bit.  Might as well make it pithy.
     Wide operator * (const Sk4px& o) const { return this->mulWiden(o); }
 
     // These just keep the types as Sk4px so the user doesn't have to keep casting.
     Sk4px operator + (const Sk4px& o) const { return INHERITED::operator+(o); }
     Sk4px operator - (const Sk4px& o) const { return INHERITED::operator-(o); }
     Sk4px operator < (const Sk4px& o) const { return INHERITED::operator<(o); }
     Sk4px thenElse(const Sk4px& t, const Sk4px& e) const { return INHERITED::thenElse(t,e); }
@@ skipping 105 matching lines @@
     #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2
         #include "../opts/Sk4px_SSE2.h"
     #elif defined(SK_ARM_HAS_NEON)
         #include "../opts/Sk4px_NEON.h"
     #else
         #include "../opts/Sk4px_none.h"
     #endif
 #endif
 
 #endif//Sk4px_DEFINED