SSE2 implementation of S32A_D565_Opaque

src/opts/SkColor_opts_SSE2.h

+/*
+ * Copyright 2014 The Android Open Source Project
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkColor_opts_SSE2_DEFINED
+#define SkColor_opts_SSE2_DEFINED
+
+#include <emmintrin.h>
+
+static inline __m128i SkMul16ShiftRound_SSE(__m128i a, __m128i b, int shift) {
+    __m128i prod = _mm_mullo_epi16(a, b);
+    prod = _mm_add_epi16(prod, _mm_set1_epi16(1 << (shift - 1)));
+    prod = _mm_add_epi16(prod, _mm_srli_epi16(prod, shift));
+    prod = _mm_srli_epi16(prod, shift);
+
+    return prod;
+}
+
+static inline __m128i SkPackRGB16_SSE(__m128i r, __m128i g, __m128i b) {
+    r = _mm_slli_epi16(r, SK_R16_SHIFT);
+    g = _mm_slli_epi16(g, SK_G16_SHIFT);
+    b = _mm_slli_epi16(b, SK_B16_SHIFT);
+
+    __m128i c = _mm_or_si128(r, g);
+    return _mm_or_si128(c, b);
+}
+
+#endif//SkColor_opts_SSE2_DEFINED