Perform color correction on png decodes

src/opts/SkNx_sse.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 SkNx_sse_DEFINED
 #define SkNx_sse_DEFINED
 
@@ skipping 158 matching lines @@
 
     SkNx thenElse(const SkNx& t, const SkNx& e) const {
     #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE41
         return _mm_blendv_epi8(e.fVec, t.fVec, fVec);
     #else
         return _mm_or_si128(_mm_and_si128   (fVec, t.fVec),
                             _mm_andnot_si128(fVec, e.fVec));
     #endif
     }
 
+    SkNx logicalShiftRight(int bits) const { return _mm_srli_epi32(fVec, bits); }
+
     __m128i fVec;
 };
 
 template <>
 class SkNx<4, uint16_t> {
 public:
     SkNx(const __m128i& vec) : fVec(vec) {}
 
     SkNx() {}
     SkNx(uint16_t val) : fVec(_mm_set1_epi16(val)) {}
@@ skipping 218 matching lines @@
                                const Sk4h& a) {
     __m128i rg = _mm_unpacklo_epi16(r.fVec, g.fVec);
     __m128i ba = _mm_unpacklo_epi16(b.fVec, a.fVec);
     __m128i lo = _mm_unpacklo_epi32(rg, ba);
     __m128i hi = _mm_unpackhi_epi32(rg, ba);
     _mm_storeu_si128(((__m128i*) dst) + 0, lo);
     _mm_storeu_si128(((__m128i*) dst) + 1, hi);
 }
 
 #endif//SkNx_sse_DEFINED