Add Sk4f_RoundToInt

src/opts/SkNx_sse.h

Index: src/opts/SkNx_sse.h
diff --git a/src/opts/SkNx_sse.h b/src/opts/SkNx_sse.h
index 9751c4db9141246681d8905bbaf2f5220fb293c2..346064283bbf6aa7b3f28f96d7aa85b0d0b507c0 100644
--- a/src/opts/SkNx_sse.h
+++ b/src/opts/SkNx_sse.h
@@ -377,4 +377,13 @@ template<> /*static*/ inline Sk4b SkNx_cast<uint8_t, uint16_t>(const Sk4h& src)
     return _mm_packus_epi16(src.fVec, src.fVec);
 }
 
+static inline Sk4i Sk4f_RoundToInt(const Sk4f& x) {
+    return _mm_cvtps_epi32(x.fVec);
+}
+
+static inline uint32_t Sk4f_RoundToByte(const Sk4f& x) {
+    __m128i x32 = _mm_cvtps_epi32(x.fVec);
+    return Sk4i(_mm_packus_epi16(_mm_packus_epi16(x32, x32), x32))[0];
+}
+
 #endif//SkNx_sse_DEFINED