YUY2ToI422_Any_Neon clean up to not require 16 pixels

YUY2ToI422_Any_Neon previously required 16 pixels and duplicated
the last pixel.  The replication was not necessary after a previous
change to treat YUY2 to 4 byte macro pixels.

TBR=harryjin@google.com
BUG=libyuv:648
TESTED=util/android/test_runner.py gtest -s libyuv_unittest -t 7200 --verbose --release --gtest_filter=*YUY2ToI422* -a "--libyuv_width=17 --libyuv_height=7 --libyuv_repeat=999 --libyuv_flags=1"

Review URL: https://codereview.chromium.org/2399143002 .

source/planar_functions.cc

@@ -433,6 +433,10 @@ int YUY2ToI422(const uint8* src_yuy2, int src_stride_yuy2,
       YUY2ToUV422Row_C;
   void (*YUY2ToYRow)(const uint8* src_yuy2, uint8* dst_y, int width) =
       YUY2ToYRow_C;
+  if (!src_yuy2 || !dst_y || !dst_u || !dst_v ||
+      width <= 0 || height == 0) {
+    return -1;
+  }
   // Negative height means invert the image.
   if (height < 0) {
     height = -height;
@@ -471,9 +475,7 @@ int YUY2ToI422(const uint8* src_yuy2, int src_stride_yuy2,
 #if defined(HAS_YUY2TOYROW_NEON)
   if (TestCpuFlag(kCpuHasNEON)) {
     YUY2ToYRow = YUY2ToYRow_Any_NEON;
-    if (width >= 16) {
-      YUY2ToUV422Row = YUY2ToUV422Row_Any_NEON;
-    }
+    YUY2ToUV422Row = YUY2ToUV422Row_Any_NEON;
     if (IS_ALIGNED(width, 16)) {
       YUY2ToYRow = YUY2ToYRow_NEON;
       YUY2ToUV422Row = YUY2ToUV422Row_NEON;
@@ -505,6 +507,10 @@ int UYVYToI422(const uint8* src_uyvy, int src_stride_uyvy,
       UYVYToUV422Row_C;
   void (*UYVYToYRow)(const uint8* src_uyvy,
                      uint8* dst_y, int width) = UYVYToYRow_C;
+  if (!src_uyvy || !dst_y || !dst_u || !dst_v ||
+      width <= 0 || height == 0) {
+    return -1;
+  }
   // Negative height means invert the image.
   if (height < 0) {
     height = -height;
@@ -543,9 +549,7 @@ int UYVYToI422(const uint8* src_uyvy, int src_stride_uyvy,
 #if defined(HAS_UYVYTOYROW_NEON)
   if (TestCpuFlag(kCpuHasNEON)) {
     UYVYToYRow = UYVYToYRow_Any_NEON;
-    if (width >= 16) {
-      UYVYToUV422Row = UYVYToUV422Row_Any_NEON;
-    }
+    UYVYToUV422Row = UYVYToUV422Row_Any_NEON;
     if (IS_ALIGNED(width, 16)) {
       UYVYToYRow = UYVYToYRow_NEON;
       UYVYToUV422Row = UYVYToUV422Row_NEON;

source/row_any.cc

@@ -714,11 +714,6 @@ ANY1(ARGBSetRow_Any_NEON, ARGBSetRow_NEON, uint32, 4, 3)
         ANY_SIMD(src_ptr, dst_u, dst_v, n);                                    \
       }                                                                        \
       memcpy(temp, src_ptr  + (n >> UVSHIFT) * BPP, SS(r, UVSHIFT) * BPP);     \
-      /* repeat last 4 bytes for 422 subsampler */                             \
-      if ((width & 1) && BPP == 4 && DUVSHIFT == 1) {                          \
-        memcpy(temp + SS(r, UVSHIFT) * BPP,                                    \
-               temp + SS(r, UVSHIFT) * BPP - BPP, BPP);                        \
-      }                                                                        \
       /* repeat last 4 - 12 bytes for 411 subsampler */                        \
       if (((width & 3) == 1) && BPP == 4 && DUVSHIFT == 2) {                   \
         memcpy(temp + SS(r, UVSHIFT) * BPP,                                    \