Add H422ToARGB armv7 neon version.

Patch provided by zhongwei.yao@linaro.org

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

Review URL: https://codereview.chromium.org/1344393002 .

include/libyuv/row.h

@@ -303,10 +303,11 @@ extern "C" {
 #define HAS_I422TOARGB1555ROW_NEON
 #define HAS_I422TOARGB4444ROW_NEON
 #define HAS_I422TOARGBROW_NEON
-// TODO(fbarchard): Implement NEON version
+// TODO(fbarchard): Implement aarch64 neon version
 #ifndef __aarch64__
 #define HAS_I422TOARGBMATRIXROW_NEON
 #define HAS_J422TOARGBROW_NEON
+#define HAS_H422TOARGBROW_NEON
 #endif
 // #define HAS_I422TOABGRMATRIXROW_NEON
 #define HAS_I422TOBGRAROW_NEON
@@ -609,6 +610,11 @@ void J422ToARGBRow_NEON(const uint8* src_y,
                         const uint8* src_v,
                         uint8* dst_argb,
                         int width);
+void H422ToARGBRow_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,
@@ -1680,6 +1686,11 @@ void J422ToARGBRow_Any_NEON(const uint8* src_y,
                             const uint8* src_v,
                             uint8* dst_argb,
                             int width);
+void H422ToARGBRow_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

@@ -120,6 +120,7 @@ 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)
+ANY31(H422ToARGBRow_Any_NEON, H422ToARGBRow_NEON, 1, 0, 4, 7)
 #endif
 #ifdef HAS_I422TOYUY2ROW_NEON
 ANY31(I422ToYUY2Row_Any_NEON, I422ToYUY2Row_NEON, 1, 1, 4, 15)

source/row_common.cc

@@ -2278,6 +2278,7 @@ extern struct YuvConstants kYuvJConstants;
 extern struct YuvConstants kYuvHConstants;
 extern struct YuvConstantsNEON kYuvConstantsNEON;
 extern struct YuvConstantsNEON kYuvJConstantsNEON;
+extern struct YuvConstantsNEON kYuvHConstantsNEON;
 
 #define ANYYUV(NAMEANY, ANY_SIMD, YUVCONSTANTS)                                \
     void NAMEANY(const uint8* y_buf,                                           \
@@ -2291,7 +2292,7 @@ extern struct YuvConstantsNEON kYuvJConstantsNEON;
 #ifdef HAS_I422TOARGBMATRIXROW_NEON
 ANYYUV(I422ToARGBRow_NEON, I422ToARGBMatrixRow_NEON, kYuvConstantsNEON)
 ANYYUV(J422ToARGBRow_NEON, I422ToARGBMatrixRow_NEON, kYuvJConstantsNEON)
-//ANYYUV(H422ToARGBRow_NEON, I422ToARGBMatrixRow_NEON, kYuvHConstantsNEON)
+ANYYUV(H422ToARGBRow_NEON, I422ToARGBMatrixRow_NEON, kYuvHConstantsNEON)
 #endif
 
 #ifdef HAS_I422TOARGBMATRIXROW_SSSE3

source/row_neon.cc

@@ -211,6 +211,44 @@ YuvConstantsNEON SIMD_ALIGNED(kYuvJConstantsNEON) = {
 #undef BGJ
 #undef BRJ
 
+// BT.709 YUV to RGB reference
+// *  R = Y                - V * -1.28033
+// *  G = Y - U *  0.21482 - V *  0.38059
+// *  B = Y - U * -2.12798
+
+// Y contribution to R,G,B.  Scale and bias.
+// TODO(fbarchard): Consider moving constants into a common header.
+#define YGH 16320 /* round(1.000 * 64 * 256 * 256 / 257) */
+#define YGBH 32  /* 64 / 2 */
+
+// U and V contributions to R,G,B.
+#define UBH -128 /* max(-128, round(-2.12798 * 64)) */
+#define UGH 14 /* round(0.21482 * 64) */
+#define VGH 24 /* round(0.38059  * 64) */
+#define VRH -82 /* round(-1.28033 * 64) */
+
+// Bias values to round, and subtract 128 from U and V.
+#define BBH (UBH * 128 + YGBH)
+#define BGH (UGH * 128 + VGH * 128 + YGBH)
+#define BRH (VRH * 128 + YGBH)
+
+// BT.709 constants for YUV to RGB.
+YuvConstantsNEON SIMD_ALIGNED(kYuvHConstantsNEON) = {
+  { -UBH, -UBH, -UBH, -UBH, -VRH, -VRH, -VRH, -VRH, 0, 0, 0, 0, 0, 0, 0, 0 },
+  { UGH, UGH, UGH, UGH, VGH, VGH, VGH, VGH, 0, 0, 0, 0, 0, 0, 0, 0 },
+  { BBH, BGH, BRH, 0, 0, 0, 0, 0 },
+  { 0x0101 * YGH, 0, 0, 0 }
+};
+
+#undef YGH
+#undef YGBH
+#undef UBH
+#undef UGH
+#undef VGH
+#undef VRH
+#undef BBH
+#undef BGH
+#undef BRH
 
 void I444ToARGBRow_NEON(const uint8* src_y,
                         const uint8* src_u,