Add J422ToARGB armv7 neon version.

R=fbarchard@chromium.org, fbarchard@google.com
BUG=libyuv:488

Review URL: https://codereview.chromium.org/1334173005 .

include/libyuv/row.h

@@ -316,6 +316,7 @@ extern "C" {
 #define HAS_I422TOUYVYROW_NEON
 #define HAS_I422TOYUY2ROW_NEON
 #define HAS_I444TOARGBROW_NEON
+#define HAS_J422TOARGBROW_NEON
 #define HAS_MERGEUVROW_NEON
 #define HAS_MIRRORROW_NEON
 #define HAS_MIRRORUVROW_NEON
@@ -603,6 +604,11 @@ void I422ToARGB4444Row_NEON(const uint8* src_y,
                             const uint8* src_v,
                             uint8* dst_argb4444,
                             int width);
+void J422ToARGBRow_NEON(const uint8* src_y,
+                        const uint8* src_u,
+                        const uint8* src_v,
+                        uint8* dst_argb,
+                        int width);
 void NV12ToARGBRow_NEON(const uint8* src_y,
                         const uint8* src_uv,
                         uint8* dst_argb,
@@ -1669,6 +1675,11 @@ void I422ToRGB565Row_Any_NEON(const uint8* src_y,
                               const uint8* src_v,
                               uint8* dst_argb,
                               int width);
+void J422ToARGBRow_Any_NEON(const uint8* src_y,
+                            const uint8* src_u,
+                            const uint8* src_v,
+                            uint8* dst_argb,
+                            int width);
 void NV12ToARGBRow_Any_NEON(const uint8* src_y,
                             const uint8* src_uv,
                             uint8* dst_argb,

source/row_any.cc

@@ -119,6 +119,7 @@ ANY31(I422ToRAWRow_Any_NEON, I422ToRAWRow_NEON, 1, 0, 3, 7)
 ANY31(I422ToARGB4444Row_Any_NEON, I422ToARGB4444Row_NEON, 1, 0, 2, 7)
 ANY31(I422ToARGB1555Row_Any_NEON, I422ToARGB1555Row_NEON, 1, 0, 2, 7)
 ANY31(I422ToRGB565Row_Any_NEON, I422ToRGB565Row_NEON, 1, 0, 2, 7)
+ANY31(J422ToARGBRow_Any_NEON, J422ToARGBRow_NEON, 1, 0, 4, 7)
 #endif
 #ifdef HAS_I422TOYUY2ROW_NEON
 ANY31(I422ToYUY2Row_Any_NEON, I422ToYUY2Row_NEON, 1, 1, 4, 15)

source/row_common.cc

@@ -2277,6 +2277,7 @@ extern struct YuvConstants kYuvConstants;
 extern struct YuvConstants kYuvJConstants;
 extern struct YuvConstants kYuvHConstants;
 extern struct YuvConstantsNEON kYuvConstantsNEON;
+extern struct YuvConstantsNEON kYuvJConstantsNEON;
 
 #define ANYYUV(NAMEANY, ANY_SIMD, YUVCONSTANTS)                                \
     void NAMEANY(const uint8* y_buf,                                           \
@@ -2289,7 +2290,7 @@ extern struct YuvConstantsNEON kYuvConstantsNEON;
 
 #ifdef HAS_I422TOARGBMATRIXROW_NEON
 ANYYUV(I422ToARGBRow_NEON, I422ToARGBMatrixRow_NEON, kYuvConstantsNEON)
-//ANYYUV(J422ToARGBRow_NEON, I422ToARGBMatrixRow_NEON, kYuvJConstantsNEON)
+ANYYUV(J422ToARGBRow_NEON, I422ToARGBMatrixRow_NEON, kYuvJConstantsNEON)
 //ANYYUV(H422ToARGBRow_NEON, I422ToARGBMatrixRow_NEON, kYuvHConstantsNEON)
 #endif
 

source/row_neon.cc

@@ -172,6 +172,46 @@ YuvConstantsNEON SIMD_ALIGNED(kYuvConstantsNEON) = {
 #undef BG
 #undef BR
 
+// JPEG YUV to RGB reference
+// *  R = Y                - V * -1.40200
+// *  G = Y - U *  0.34414 - V *  0.71414
+// *  B = Y - U * -1.77200
+
+// Y contribution to R,G,B.  Scale and bias.
+// TODO(fbarchard): Consider moving constants into a common header.
+#define YGJ 16320 /* round(1.000 * 64 * 256 * 256 / 257) */
+#define YGBJ 32  /* 64 / 2 */
+
+// U and V contributions to R,G,B.
+#define UBJ -113 /* round(-1.77200 * 64) */
+#define UGJ 22 /* round(0.34414 * 64) */
+#define VGJ 46 /* round(0.71414  * 64) */
+#define VRJ -90 /* round(-1.40200 * 64) */
+
+// Bias values to subtract 16 from Y and 128 from U and V.
+#define BBJ (UBJ * 128             + YGBJ)
+#define BGJ (UGJ * 128 + VGJ * 128 + YGBJ)
+#define BRJ             (VRJ * 128 + YGBJ)
+
+// JPEG constants for YUV to RGB.
+YuvConstantsNEON SIMD_ALIGNED(kYuvJConstantsNEON) = {
+  { -UBJ, -UBJ, -UBJ, -UBJ, -VRJ, -VRJ, -VRJ, -VRJ, 0, 0, 0, 0, 0, 0, 0, 0 },
+  { UGJ, UGJ, UGJ, UGJ, VGJ, VGJ, VGJ, VGJ, 0, 0, 0, 0, 0, 0, 0, 0 },
+  { BBJ, BGJ, BRJ, 0, 0, 0, 0, 0 },
+  { 0x0101 * YGJ, 0, 0, 0 }
+};
+
+#undef YGJ
+#undef YGBJ
+#undef UBJ
+#undef UGJ
+#undef VGJ
+#undef VRJ
+#undef BBJ
+#undef BGJ
+#undef BRJ
+
+
 void I444ToARGBRow_NEON(const uint8* src_y,
                         const uint8* src_u,
                         const uint8* src_v,