libvpx: Pull from upstream

source/libvpx/vp9/vp9_iface_common.h

Index: source/libvpx/vp9/vp9_iface_common.h
===================================================================
--- source/libvpx/vp9/vp9_iface_common.h	(revision 285372)
+++ source/libvpx/vp9/vp9_iface_common.h	(working copy)
@@ -41,11 +41,11 @@
   img->planes[VPX_PLANE_Y] = yv12->y_buffer;
   img->planes[VPX_PLANE_U] = yv12->u_buffer;
   img->planes[VPX_PLANE_V] = yv12->v_buffer;
-  img->planes[VPX_PLANE_ALPHA] = yv12->alpha_buffer;
+  img->planes[VPX_PLANE_ALPHA] = NULL;
   img->stride[VPX_PLANE_Y] = yv12->y_stride;
   img->stride[VPX_PLANE_U] = yv12->uv_stride;
   img->stride[VPX_PLANE_V] = yv12->uv_stride;
-  img->stride[VPX_PLANE_ALPHA] = yv12->alpha_stride;
+  img->stride[VPX_PLANE_ALPHA] = yv12->y_stride;
   img->bps = bps;
   img->user_priv = user_priv;
   img->img_data = yv12->buffer_alloc;
@@ -58,7 +58,6 @@
   yv12->y_buffer = img->planes[VPX_PLANE_Y];
   yv12->u_buffer = img->planes[VPX_PLANE_U];
   yv12->v_buffer = img->planes[VPX_PLANE_V];
-  yv12->alpha_buffer = img->planes[VPX_PLANE_ALPHA];
 
   yv12->y_crop_width  = img->d_w;
   yv12->y_crop_height = img->d_h;
@@ -70,21 +69,10 @@
   yv12->uv_height = img->y_chroma_shift == 1 ? (1 + yv12->y_height) / 2
                                              : yv12->y_height;
 
-  yv12->alpha_width = yv12->alpha_buffer ? img->d_w : 0;
-  yv12->alpha_height = yv12->alpha_buffer ? img->d_h : 0;
-
   yv12->y_stride = img->stride[VPX_PLANE_Y];
   yv12->uv_stride = img->stride[VPX_PLANE_U];
-  yv12->alpha_stride = yv12->alpha_buffer ? img->stride[VPX_PLANE_ALPHA] : 0;
 
   yv12->border  = (img->stride[VPX_PLANE_Y] - img->w) / 2;
-#if CONFIG_ALPHA
-  // For development purposes, force alpha to hold the same data as Y for now.
-  yv12->alpha_buffer = yv12->y_buffer;
-  yv12->alpha_width = yv12->y_width;
-  yv12->alpha_height = yv12->y_height;
-  yv12->alpha_stride = yv12->y_stride;
-#endif
   return VPX_CODEC_OK;
 }