Add ARGBExtractAlpha function

source/row_any.cc

 /*
  *  Copyright 2012 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 448 matching lines @@
 #endif
 #ifdef HAS_ARGBATTENUATEROW_AVX2
 ANY11(ARGBAttenuateRow_Any_AVX2, ARGBAttenuateRow_AVX2, 0, 4, 4, 7)
 #endif
 #ifdef HAS_ARGBUNATTENUATEROW_AVX2
 ANY11(ARGBUnattenuateRow_Any_AVX2, ARGBUnattenuateRow_AVX2, 0, 4, 4, 7)
 #endif
 #ifdef HAS_ARGBATTENUATEROW_NEON
 ANY11(ARGBAttenuateRow_Any_NEON, ARGBAttenuateRow_NEON, 0, 4, 4, 7)
 #endif
+#ifdef HAS_ARGBEXTRACTALPHAROW_SSE2
+ANY11(ARGBExtractAlphaRow_Any_SSE2, ARGBExtractAlphaRow_SSE2, 0, 4, 1, 7)
+#endif
+#ifdef HAS_ARGBEXTRACTALPHAROW_NEON
+ANY11(ARGBExtractAlphaRow_Any_NEON, ARGBExtractAlphaRow_NEON, 0, 4, 1, 7)
+#endif
 #undef ANY11
 
 // Any 1 to 1 blended.  Destination is read, modify, write.
 #define ANY11B(NAMEANY, ANY_SIMD, UVSHIFT, SBPP, BPP, MASK)                    \
     void NAMEANY(const uint8* src_ptr, uint8* dst_ptr, int width) {            \
       SIMD_ALIGNED(uint8 temp[128 * 2]);                                       \
       memset(temp, 0, 128 * 2);  /* for YUY2 and msan */                       \
       int r = width & MASK;                                                    \
       int n = width & ~MASK;                                                   \
       if (n > 0) {                                                             \
@@ skipping 330 matching lines @@
 #endif
 #ifdef HAS_UYVYTOUVROW_NEON
 ANY12S(UYVYToUVRow_Any_NEON, UYVYToUVRow_NEON, 1, 4, 15)
 #endif
 #undef ANY12S
 
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv
 #endif