Add rounding to InterpolateRow for improved quality and consistency.

source/scale_argb.cc

Index: source/scale_argb.cc
diff --git a/source/scale_argb.cc b/source/scale_argb.cc
index 132581cce855dd52f7b1ee784fb381b3ebb2ac86..adddf9db5a4a2bbed6ac9daabac3443557f12a82 100644
--- a/source/scale_argb.cc
+++ b/source/scale_argb.cc
@@ -210,14 +210,6 @@ static void ScaleARGBBilinearDown(int src_width, int src_height,
   clip_src_width = (int)(xr - xl) * 4;  // Width aligned to 4.
   src_argb += xl * 4;
   x -= (int)(xl << 16);
-#if defined(HAS_INTERPOLATEROW_SSE2)
-  if (TestCpuFlag(kCpuHasSSE2)) {
-    InterpolateRow = InterpolateRow_Any_SSE2;
-    if (IS_ALIGNED(clip_src_width, 16)) {
-      InterpolateRow = InterpolateRow_SSE2;
-    }
-  }
-#endif
 #if defined(HAS_INTERPOLATEROW_SSSE3)
   if (TestCpuFlag(kCpuHasSSSE3)) {
     InterpolateRow = InterpolateRow_Any_SSSE3;
@@ -308,14 +300,6 @@ static void ScaleARGBBilinearUp(int src_width, int src_height,
       int dst_width, int x, int dx) =
       filtering ? ScaleARGBFilterCols_C : ScaleARGBCols_C;
   const int max_y = (src_height - 1) << 16;
-#if defined(HAS_INTERPOLATEROW_SSE2)
-  if (TestCpuFlag(kCpuHasSSE2)) {
-    InterpolateRow = InterpolateRow_Any_SSE2;
-    if (IS_ALIGNED(dst_width, 4)) {
-      InterpolateRow = InterpolateRow_SSE2;
-    }
-  }
-#endif
 #if defined(HAS_INTERPOLATEROW_SSSE3)
   if (TestCpuFlag(kCpuHasSSSE3)) {
     InterpolateRow = InterpolateRow_Any_SSSE3;
@@ -494,14 +478,6 @@ static void ScaleYUVToARGBBilinearUp(int src_width, int src_height,
   void (*InterpolateRow)(uint8* dst_argb, const uint8* src_argb,
       ptrdiff_t src_stride, int dst_width, int source_y_fraction) =
       InterpolateRow_C;
-#if defined(HAS_INTERPOLATEROW_SSE2)
-  if (TestCpuFlag(kCpuHasSSE2)) {
-    InterpolateRow = InterpolateRow_Any_SSE2;
-    if (IS_ALIGNED(dst_width, 4)) {
-      InterpolateRow = InterpolateRow_SSE2;
-    }
-  }
-#endif
 #if defined(HAS_INTERPOLATEROW_SSSE3)
   if (TestCpuFlag(kCpuHasSSSE3)) {
     InterpolateRow = InterpolateRow_Any_SSSE3;