3-15% speedup to HardLight / Overlay xfermodes.

src/opts/Sk4px_none.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.
  */
 
 #include "SkUtils.h"
 
 namespace { // See Sk4px.h
@@ skipping 30 matching lines @@
 
 inline Sk4px::Wide Sk4px::widenLo() const {
     return Sk16h(this->kth< 0>(), this->kth< 1>(), this->kth< 2>(), this->kth< 3>(),
                  this->kth< 4>(), this->kth< 5>(), this->kth< 6>(), this->kth< 7>(),
                  this->kth< 8>(), this->kth< 9>(), this->kth<10>(), this->kth<11>(),
                  this->kth<12>(), this->kth<13>(), this->kth<14>(), this->kth<15>());
 }
 
 inline Sk4px::Wide Sk4px::widenHi() const { return this->widenLo() << 8; }
 
+inline Sk4px::Wide Sk4px::widenLoHi() const { return this->widenLo() + this->widenHi(); }
+
 inline Sk4px::Wide Sk4px::mulWiden(const Sk16b& other) const {
     return this->widenLo() * Sk4px(other).widenLo();
 }
 
 inline Sk4px Sk4px::Wide::addNarrowHi(const Sk16h& other) const {
     Sk4px::Wide r = (*this + other) >> 8;
     return Sk16b(r.kth< 0>(), r.kth< 1>(), r.kth< 2>(), r.kth< 3>(),
                  r.kth< 4>(), r.kth< 5>(), r.kth< 6>(), r.kth< 7>(),
                  r.kth< 8>(), r.kth< 9>(), r.kth<10>(), r.kth<11>(),
                  r.kth<12>(), r.kth<13>(), r.kth<14>(), r.kth<15>());
@@ skipping 31 matching lines @@
 
 inline Sk4px Sk4px::zeroColors() const {
     static_assert(SK_A32_SHIFT == 24, "This method assumes little-endian.");
     return Sk16b(0,0,0, this->kth< 3>(),
                  0,0,0, this->kth< 7>(),
                  0,0,0, this->kth<11>(),
                  0,0,0, this->kth<15>());
 }
 
 }  // namespace