Reimplement NV21ToARGB to allow different color matrix.

include/libyuv/scale_row.h

 /*
  *  Copyright 2013 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.
  */
 
 #ifndef INCLUDE_LIBYUV_SCALE_ROW_H_  // NOLINT
 #define INCLUDE_LIBYUV_SCALE_ROW_H_
 
 #include "libyuv/basic_types.h"
 #include "libyuv/scale.h"
 
 #ifdef __cplusplus
 namespace libyuv {
 extern "C" {
 #endif
 
 #if defined(__pnacl__) || defined(__CLR_VER) || \
     (defined(__i386__) && !defined(__SSE2__))
 #define LIBYUV_DISABLE_X86
 #endif
 
-// Visual C 2012 required for AVX2.
-#if defined(_M_IX86) && !defined(__clang__) && \
-    defined(_MSC_VER) && _MSC_VER >= 1700
-#define VISUALC_HAS_AVX2 1
-#endif  // VisualStudio >= 2012
+// GCC >= 4.7.0 required for AVX2.
+#if defined(__GNUC__) && (defined(__x86_64__) || defined(__i386__))
+#if (__GNUC__ > 4) || (__GNUC__ == 4 && (__GNUC_MINOR__ >= 7))
+#define GCC_HAS_AVX2 1
+#endif  // GNUC >= 4.7
+#endif  // __GNUC__
 
 // clang >= 3.4.0 required for AVX2.
 #if defined(__clang__) && (defined(__x86_64__) || defined(__i386__))
 #if (__clang_major__ > 3) || (__clang_major__ == 3 && (__clang_minor__ >= 4))
 #define CLANG_HAS_AVX2 1
 #endif  // clang >= 3.4
 #endif  // __clang__
 
+// Visual C 2012 required for AVX2.
+#if defined(_M_IX86) && !defined(__clang__) && \
+    defined(_MSC_VER) && _MSC_VER >= 1700
+#define VISUALC_HAS_AVX2 1
+#endif  // VisualStudio >= 2012
+
 // The following are available on all x86 platforms:
 #if !defined(LIBYUV_DISABLE_X86) && \
     (defined(_M_IX86) || defined(__x86_64__) || defined(__i386__))
 #define HAS_FIXEDDIV1_X86
 #define HAS_FIXEDDIV_X86
 #define HAS_SCALEARGBCOLS_SSE2
 #define HAS_SCALEARGBCOLSUP2_SSE2
 #define HAS_SCALEARGBFILTERCOLS_SSSE3
 #define HAS_SCALEARGBROWDOWN2_SSE2
 #define HAS_SCALEARGBROWDOWNEVEN_SSE2
 #define HAS_SCALECOLSUP2_SSE2
 #define HAS_SCALEFILTERCOLS_SSSE3
 #define HAS_SCALEROWDOWN2_SSE2
 #define HAS_SCALEROWDOWN34_SSSE3
 #define HAS_SCALEROWDOWN38_SSSE3
 #define HAS_SCALEROWDOWN4_SSE2
 #define HAS_SCALEADDROW_SSE2
 #endif
 
+// The following are available on all x86 platforms, but
+// require VS2012, clang 3.4 or gcc 4.7.
+// The code supports NaCL but requires a new compiler and validator.
+#if !defined(LIBYUV_DISABLE_X86) && (defined(VISUALC_HAS_AVX2) || \
+    defined(CLANG_HAS_AVX2) || defined(GCC_HAS_AVX2))
+#define HAS_SCALEADDROW_AVX2
+#endif
+
 // The following are available for Visual C and clangcl 32 bit:
 #if !defined(LIBYUV_DISABLE_X86) && defined(_M_IX86) && \
     (defined(VISUALC_HAS_AVX2) || defined(CLANG_HAS_AVX2))
-#define HAS_SCALEADDROW_AVX2
 #define HAS_SCALEROWDOWN2_AVX2
 #define HAS_SCALEROWDOWN4_AVX2
 #endif
 
 // The following are available on Neon platforms:
 #if !defined(LIBYUV_DISABLE_NEON) && !defined(__native_client__) && \
     (defined(__ARM_NEON__) || defined(LIBYUV_NEON) || defined(__aarch64__))
 #define HAS_SCALEARGBCOLS_NEON
 #define HAS_SCALEARGBROWDOWN2_NEON
 #define HAS_SCALEARGBROWDOWNEVEN_NEON
@@ skipping 400 matching lines @@
 void ScaleRowDown38_3_Box_MIPS_DSPR2(const uint8* src_ptr,
                                      ptrdiff_t src_stride,
                                      uint8* dst_ptr, int dst_width);
 
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv
 #endif
 
 #endif  // INCLUDE_LIBYUV_SCALE_ROW_H_  NOLINT