Refactor of SkColorSpaceXformOpts

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 429 matching lines @@
 }
 
 template<> /*static*/ inline Sk4i SkNx_cast<int32_t, uint16_t>(const Sk4h& src) {
     return _mm_unpacklo_epi16(src.fVec, _mm_setzero_si128());
 }
 
 template<> /*static*/ inline Sk4b SkNx_cast<uint8_t, int32_t>(const Sk4i& src) {
     return _mm_packus_epi16(_mm_packus_epi16(src.fVec, src.fVec), src.fVec);
 }
 
+template<> /*static*/ inline Sk4i SkNx_cast<int32_t, uint32_t>(const Sk4u& src) {
+    return src.fVec;
+}
+
 static inline Sk4i Sk4f_round(const Sk4f& x) {
     return _mm_cvtps_epi32(x.fVec);
 }
 
 static inline void Sk4h_load4(const void* ptr, Sk4h* r, Sk4h* g, Sk4h* b, Sk4h* a) {
     __m128i lo = _mm_loadu_si128(((__m128i*)ptr) + 0),
             hi = _mm_loadu_si128(((__m128i*)ptr) + 1);
     __m128i even = _mm_unpacklo_epi16(lo, hi),   // r0 r2 g0 g2 b0 b2 a0 a2
              odd = _mm_unpackhi_epi16(lo, hi);   // r1 r3 ...
     __m128i rg = _mm_unpacklo_epi16(even, odd),  // r0 r1 r2 r3 g0 g1 g2 g3
             ba = _mm_unpackhi_epi16(even, odd);  // b0 b1 ...   a0 a1 ...
     *r = rg;
     *g = _mm_srli_si128(rg, 8);
     *b = ba;
     *a = _mm_srli_si128(ba, 8);
 }
 
 static inline void Sk4h_store4(void* dst, const Sk4h& r, const Sk4h& g, const Sk4h& b,
                                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