YUV use same constant as asm then multiply by 0x0101 to replicate the value.

BUG=324
TESTED=try bots
R=harryjin@google.com

Review URL: https://webrtc-codereview.appspot.com/41559004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1235 16f28f9a-4ce2-e073-06de-1de4eb20be90

source/row_common.cc

@@ -962,7 +962,7 @@ void I400ToARGBRow_C(const uint8* src_y, uint8* dst_argb, int width) {
 
 // C reference code that mimics the YUV assembly.
 
-#define YG 4901247 /* round(1.164 * 64 * 256) = 19071 * 0x0101 */
+#define YG 19071 /* round(1.164 * 64 * 256) */
 #define YGB 1192  /* round(1.164 * 64 * 16) */
 
 #define UB 127 /* min(127, round(2.018 * 64)) */
@@ -980,7 +980,7 @@ void I400ToARGBRow_C(const uint8* src_y, uint8* dst_argb, int width) {
 
 static __inline void YuvPixel(uint8 y, uint8 u, uint8 v,
                               uint8* b, uint8* g, uint8* r) {
-  uint32 y1 = (uint32)(y * YG) >> 16;
+  uint32 y1 = (uint32)(y * 0x0101 * YG) >> 16;
   *b = Clamp((int32)(u * UB + v * VB + y1 - BB) >> 6);
   *g = Clamp((int32)(u * UG + v * VG + y1 - BG) >> 6);
   *r = Clamp((int32)(u * UR + v * VR + y1 - BR) >> 6);