Add ARGBExtractAlpha function

include/libyuv/row.h

 /*
  *  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 86 matching lines @@
 #define HAS_ARGBTOARGB4444ROW_SSE2
 #define HAS_ARGBTORAWROW_SSSE3
 #define HAS_ARGBTORGB24ROW_SSSE3
 #define HAS_ARGBTORGB565DITHERROW_SSE2
 #define HAS_ARGBTORGB565ROW_SSE2
 #define HAS_ARGBTOUV444ROW_SSSE3
 #define HAS_ARGBTOUVJROW_SSSE3
 #define HAS_ARGBTOUVROW_SSSE3
 #define HAS_ARGBTOYJROW_SSSE3
 #define HAS_ARGBTOYROW_SSSE3
+#define HAS_ARGBEXTRACTALPHAROW_SSE2
 #define HAS_BGRATOUVROW_SSSE3
 #define HAS_BGRATOYROW_SSSE3
 #define HAS_COPYROW_ERMS
 #define HAS_COPYROW_SSE2
 #define HAS_H422TOARGBROW_SSSE3
 #define HAS_I400TOARGBROW_SSE2
 #define HAS_I422TOARGB1555ROW_SSSE3
 #define HAS_I422TOARGB4444ROW_SSSE3
 #define HAS_I422TOARGBROW_SSSE3
 #define HAS_I422TORGB24ROW_SSSE3
@@ skipping 167 matching lines @@
 #define HAS_ARGBTORAWROW_NEON
 #define HAS_ARGBTORGB24ROW_NEON
 #define HAS_ARGBTORGB565DITHERROW_NEON
 #define HAS_ARGBTORGB565ROW_NEON
 #define HAS_ARGBTOUV411ROW_NEON
 #define HAS_ARGBTOUV444ROW_NEON
 #define HAS_ARGBTOUVJROW_NEON
 #define HAS_ARGBTOUVROW_NEON
 #define HAS_ARGBTOYJROW_NEON
 #define HAS_ARGBTOYROW_NEON
+#define HAS_ARGBEXTRACTALPHAROW_NEON
 #define HAS_BGRATOUVROW_NEON
 #define HAS_BGRATOYROW_NEON
 #define HAS_COPYROW_NEON
 #define HAS_I400TOARGBROW_NEON
 #define HAS_I411TOARGBROW_NEON
 #define HAS_I422ALPHATOARGBROW_NEON
 #define HAS_I422TOARGB1555ROW_NEON
 #define HAS_I422TOARGB4444ROW_NEON
 #define HAS_I422TOARGBROW_NEON
 #define HAS_I422TORGB24ROW_NEON
@@ skipping 566 matching lines @@
 void CopyRow_16_C(const uint16* src, uint16* dst, int count);
 
 void ARGBCopyAlphaRow_C(const uint8* src_argb, uint8* dst_argb, int width);
 void ARGBCopyAlphaRow_SSE2(const uint8* src_argb, uint8* dst_argb, int width);
 void ARGBCopyAlphaRow_AVX2(const uint8* src_argb, uint8* dst_argb, int width);
 void ARGBCopyAlphaRow_Any_SSE2(const uint8* src_argb, uint8* dst_argb,
                                int width);
 void ARGBCopyAlphaRow_Any_AVX2(const uint8* src_argb, uint8* dst_argb,
                                int width);
 
+void ARGBExtractAlphaRow_C(const uint8* src_argb, uint8* dst_a, int width);
+void ARGBExtractAlphaRow_SSE2(const uint8* src_argb, uint8* dst_a, int width);
+void ARGBExtractAlphaRow_NEON(const uint8* src_argb, uint8* dst_a, int width);
+void ARGBExtractAlphaRow_Any_SSE2(const uint8* src_argb, uint8* dst_a,
+                                  int width);
+void ARGBExtractAlphaRow_Any_NEON(const uint8* src_argb, uint8* dst_a,
+                                  int width);
+
 void ARGBCopyYToAlphaRow_C(const uint8* src_y, uint8* dst_argb, int width);
 void ARGBCopyYToAlphaRow_SSE2(const uint8* src_y, uint8* dst_argb, int width);
 void ARGBCopyYToAlphaRow_AVX2(const uint8* src_y, uint8* dst_argb, int width);
 void ARGBCopyYToAlphaRow_Any_SSE2(const uint8* src_y, uint8* dst_argb,
                                   int width);
 void ARGBCopyYToAlphaRow_Any_AVX2(const uint8* src_y, uint8* dst_argb,
                                   int width);
 
 void SetRow_C(uint8* dst, uint8 v8, int count);
 void SetRow_X86(uint8* dst, uint8 v8, int count);
@@ skipping 1030 matching lines @@
 void ARGBLumaColorTableRow_SSSE3(const uint8* src_argb, uint8* dst_argb,
                                  int width,
                                  const uint8* luma, uint32 lumacoeff);
 
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv
 #endif
 
 #endif  // INCLUDE_LIBYUV_ROW_H_  NOLINT