Add rounding to InterpolateRow for improved quality and consistency.

source/scale.cc

Index: source/scale.cc
diff --git a/source/scale.cc b/source/scale.cc
index 0dfd99b20606fae45ae2b3bf94309c79af3c42d0..595314f35cbda7526317d0857f79adf654c559d8 100644
--- a/source/scale.cc
+++ b/source/scale.cc
@@ -875,14 +875,6 @@ void ScalePlaneBilinearDown(int src_width, int src_height,
              &x, &y, &dx, &dy);
   src_width = Abs(src_width);
 
-#if defined(HAS_INTERPOLATEROW_SSE2)
-  if (TestCpuFlag(kCpuHasSSE2)) {
-    InterpolateRow = InterpolateRow_Any_SSE2;
-    if (IS_ALIGNED(src_width, 16)) {
-      InterpolateRow = InterpolateRow_SSE2;
-    }
-  }
-#endif
 #if defined(HAS_INTERPOLATEROW_SSSE3)
   if (TestCpuFlag(kCpuHasSSSE3)) {
     InterpolateRow = InterpolateRow_Any_SSSE3;
@@ -1072,14 +1064,6 @@ void ScalePlaneBilinearUp(int src_width, int src_height,
              &x, &y, &dx, &dy);
   src_width = Abs(src_width);
 
-#if defined(HAS_INTERPOLATEROW_SSE2)
-  if (TestCpuFlag(kCpuHasSSE2)) {
-    InterpolateRow = InterpolateRow_Any_SSE2;
-    if (IS_ALIGNED(dst_width, 16)) {
-      InterpolateRow = InterpolateRow_SSE2;
-    }
-  }
-#endif
 #if defined(HAS_INTERPOLATEROW_SSSE3)
   if (TestCpuFlag(kCpuHasSSSE3)) {
     InterpolateRow = InterpolateRow_Any_SSSE3;