Add ARGBExtractAlpha_AVX2 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 221 matching lines @@
 
 // Effects:
 #define HAS_ARGBADDROW_AVX2
 #define HAS_ARGBATTENUATEROW_AVX2
 #define HAS_ARGBMULTIPLYROW_AVX2
 #define HAS_ARGBSUBTRACTROW_AVX2
 #define HAS_ARGBUNATTENUATEROW_AVX2
 #define HAS_BLENDPLANEROW_AVX2
 #endif
 
+
+// The following are available clang 3.4 or gcc 4.7.
+// TODO(fbarchard): Port to Visual C
+#if !defined(LIBYUV_DISABLE_X86) && \
+    (defined(CLANG_HAS_AVX2) || defined(GCC_HAS_AVX2)) && \
+    !(defined(__clang__) && defined(_M_IX86) )
+#define HAS_ARGBEXTRACTALPHAROW_AVX2
+#endif
+
 // The following are available for AVX2 Visual C and clangcl 32 bit:
 // TODO(fbarchard): Port to gcc.
 #if !defined(LIBYUV_DISABLE_X86) && defined(_M_IX86) && \
     (defined(VISUALC_HAS_AVX2) || defined(CLANG_HAS_AVX2))
 #define HAS_ARGB1555TOARGBROW_AVX2
 #define HAS_ARGB4444TOARGBROW_AVX2
 #define HAS_ARGBTOARGB1555ROW_AVX2
 #define HAS_ARGBTOARGB4444ROW_AVX2
 #define HAS_ARGBTORGB565ROW_AVX2
 #define HAS_J400TOARGBROW_AVX2
@@ skipping 621 matching lines @@
 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_AVX2(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_AVX2(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);
@@ skipping 1042 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_