refactor ARGBToI422 using ARGBToI420 internally

source/row_common.cc

Index: source/row_common.cc
diff --git a/source/row_common.cc b/source/row_common.cc
index c820cdf1f87472169d634f90ae45bf8c384edc83..011501f90a92e9e68b6fa619bb46de5d2f658bcf 100644
--- a/source/row_common.cc
+++ b/source/row_common.cc
@@ -433,28 +433,6 @@ void NAME ## ToUVJRow_C(const uint8* src_rgb0, int src_stride_rgb,             \
 MAKEROWYJ(ARGB, 2, 1, 0, 4)
 #undef MAKEROWYJ
 
-void ARGBToUVJ422Row_C(const uint8* src_argb,
-                       uint8* dst_u, uint8* dst_v, int width) {
-  int x;
-  for (x = 0; x < width - 1; x += 2) {
-    uint8 ab = (src_argb[0] + src_argb[4]) >> 1;
-    uint8 ag = (src_argb[1] + src_argb[5]) >> 1;
-    uint8 ar = (src_argb[2] + src_argb[6]) >> 1;
-    dst_u[0] = RGBToUJ(ar, ag, ab);
-    dst_v[0] = RGBToVJ(ar, ag, ab);
-    src_argb += 8;
-    dst_u += 1;
-    dst_v += 1;
-  }
-  if (width & 1) {
-    uint8 ab = src_argb[0];
-    uint8 ag = src_argb[1];
-    uint8 ar = src_argb[2];
-    dst_u[0] = RGBToUJ(ar, ag, ab);
-    dst_v[0] = RGBToVJ(ar, ag, ab);
-  }
-}
-
 void RGB565ToYRow_C(const uint8* src_rgb565, uint8* dst_y, int width) {
   int x;
   for (x = 0; x < width; ++x) {
@@ -658,28 +636,6 @@ void ARGBToUV444Row_C(const uint8* src_argb,
   }
 }
 
-void ARGBToUV422Row_C(const uint8* src_argb,
-                      uint8* dst_u, uint8* dst_v, int width) {
-  int x;
-  for (x = 0; x < width - 1; x += 2) {
-    uint8 ab = (src_argb[0] + src_argb[4]) >> 1;
-    uint8 ag = (src_argb[1] + src_argb[5]) >> 1;
-    uint8 ar = (src_argb[2] + src_argb[6]) >> 1;
-    dst_u[0] = RGBToU(ar, ag, ab);
-    dst_v[0] = RGBToV(ar, ag, ab);
-    src_argb += 8;
-    dst_u += 1;
-    dst_v += 1;
-  }
-  if (width & 1) {
-    uint8 ab = src_argb[0];
-    uint8 ag = src_argb[1];
-    uint8 ar = src_argb[2];
-    dst_u[0] = RGBToU(ar, ag, ab);
-    dst_v[0] = RGBToV(ar, ag, ab);
-  }
-}
-
 void ARGBToUV411Row_C(const uint8* src_argb,
                       uint8* dst_u, uint8* dst_v, int width) {
   int x;