Reimplement NV21ToARGB to allow different color matrix.

source/row_neon.cc

 /*
  *  Copyright 2011 The LibYuv Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS. All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 561 matching lines @@
       "+r"(width)      // %3
     : [kUVToRB]"r"(&yuvconstants->kUVToRB),
       [kUVToG]"r"(&yuvconstants->kUVToG),
       [kUVBiasBGR]"r"(&yuvconstants->kUVBiasBGR),
       [kYToRgb]"r"(&yuvconstants->kYToRgb)
     : "cc", "memory", "q0", "q1", "q2", "q3", "q4",
       "q8", "q9", "q10", "q11", "q12", "q13", "q14", "q15"
   );
 }
 
+void NV21ToARGBRow_NEON(const uint8* src_y,
+                        const uint8* src_vu,
+                        uint8* dst_argb,
+                        struct YuvConstants* yuvconstants,
+                        int width) {
+  asm volatile (
+    YUVTORGB_SETUP
+  "1:                                          \n"
+    READNV21
+    YUVTORGB
+    "subs       %3, %3, #8                     \n"
+    "vmov.u8    d23, #255                      \n"
+    MEMACCESS(2)
+    "vst4.8     {d20, d21, d22, d23}, [%2]!    \n"
+    "bgt        1b                             \n"
+    : "+r"(src_y),     // %0
+      "+r"(src_vu),    // %1
+      "+r"(dst_argb),  // %2
+      "+r"(width)      // %3
+    : [kUVToRB]"r"(&yuvconstants->kUVToRB),
+      [kUVToG]"r"(&yuvconstants->kUVToG),
+      [kUVBiasBGR]"r"(&yuvconstants->kUVBiasBGR),
+      [kYToRgb]"r"(&yuvconstants->kYToRgb)
+    : "cc", "memory", "q0", "q1", "q2", "q3", "q4",
+      "q8", "q9", "q10", "q11", "q12", "q13", "q14", "q15"
+  );
+}
+
 void NV12ToRGB565Row_NEON(const uint8* src_y,
                           const uint8* src_uv,
                           uint8* dst_rgb565,
                           struct YuvConstants* yuvconstants,
                           int width) {
   asm volatile (
     YUVTORGB_SETUP
   "1:                                          \n"
     READNV12
     YUVTORGB
@@ skipping 2331 matching lines @@
     "r"(6)             // %5
   : "cc", "memory", "q0", "q1"  // Clobber List
   );
 }
 #endif  // defined(__ARM_NEON__) && !defined(__aarch64__)
 
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv
 #endif