libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_extend.c

 /*
  *  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.
  */
 
@@ skipping 57 matching lines @@
                        16);
   const int er_y = MAX(ALIGN_POWER_OF_TWO(src->y_height, 6) - src->y_height,
                        16);
   const int uv_width_subsampling = (src->uv_width != src->y_width);
   const int uv_height_subsampling = (src->uv_height != src->y_height);
   const int et_uv = et_y >> uv_height_subsampling;
   const int el_uv = el_y >> uv_width_subsampling;
   const int eb_uv = eb_y >> uv_height_subsampling;
   const int er_uv = er_y >> uv_width_subsampling;
 
-#if CONFIG_ALPHA
-  const int et_a = dst->border >> (dst->alpha_height != dst->y_height);
-  const int el_a = dst->border >> (dst->alpha_width != dst->y_width);
-  const int eb_a = et_a + dst->alpha_height - src->alpha_height;
-  const int er_a = el_a + dst->alpha_width - src->alpha_width;
-
-  copy_and_extend_plane(src->alpha_buffer, src->alpha_stride,
-                        dst->alpha_buffer, dst->alpha_stride,
-                        src->alpha_width, src->alpha_height,
-                        et_a, el_a, eb_a, er_a);
-#endif
-
   copy_and_extend_plane(src->y_buffer, src->y_stride,
                         dst->y_buffer, dst->y_stride,
                         src->y_width, src->y_height,
                         et_y, el_y, eb_y, er_y);
 
   copy_and_extend_plane(src->u_buffer, src->uv_stride,
                         dst->u_buffer, dst->uv_stride,
                         src->uv_width, src->uv_height,
                         et_uv, el_uv, eb_uv, er_uv);
 
@@ skipping 34 matching lines @@
   copy_and_extend_plane(src->u_buffer + src_uv_offset, src->uv_stride,
                         dst->u_buffer + dst_uv_offset, dst->uv_stride,
                         srcw_uv, srch_uv,
                         et_uv, el_uv, eb_uv, er_uv);
 
   copy_and_extend_plane(src->v_buffer + src_uv_offset, src->uv_stride,
                         dst->v_buffer + dst_uv_offset, dst->uv_stride,
                         srcw_uv, srch_uv,
                         et_uv, el_uv, eb_uv, er_uv);
 }