libvpx: Add VP9 decoder.

source/libvpx/vp9/common/vp9_extend.h

+/*
+ *  Copyright (c) 2010 The WebM 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 VP9_COMMON_VP9_EXTEND_H_
+#define VP9_COMMON_VP9_EXTEND_H_
+
+#include "vpx_scale/yv12config.h"
+
+void vp9_extend_mb_row(YV12_BUFFER_CONFIG *ybf, unsigned char *YPtr,
+                       unsigned char *UPtr, unsigned char *VPtr);
+
+void vp9_copy_and_extend_frame(YV12_BUFFER_CONFIG *src,
+                               YV12_BUFFER_CONFIG *dst);
+
+void vp9_copy_and_extend_frame_with_rect(YV12_BUFFER_CONFIG *src,
+                                         YV12_BUFFER_CONFIG *dst,
+                                         int srcy, int srcx,
+                                         int srch, int srcw);
+
+#endif  // __INC_EXTEND_H