libvpx: Pull from upstream

source/libvpx/vpx_scale/generic/yv12extend.c

Index: source/libvpx/vpx_scale/generic/yv12extend.c
===================================================================
--- source/libvpx/vpx_scale/generic/yv12extend.c	(revision 290053)
+++ source/libvpx/vpx_scale/generic/yv12extend.c	(working copy)
@@ -56,6 +56,9 @@
 }
 
 void vp8_yv12_extend_frame_borders_c(YV12_BUFFER_CONFIG *ybf) {
+  const int uv_border = ybf->border / 2;
+
+  assert(ybf->border % 2 == 0);
   assert(ybf->y_height - ybf->y_crop_height < 16);
   assert(ybf->y_width - ybf->y_crop_width < 16);
   assert(ybf->y_height - ybf->y_crop_height >= 0);
@@ -68,16 +71,16 @@
                ybf->border + ybf->y_width - ybf->y_crop_width);
 
   extend_plane(ybf->u_buffer, ybf->uv_stride,
-               (ybf->y_crop_width + 1) / 2, (ybf->y_crop_height + 1) / 2,
-               ybf->border / 2, ybf->border / 2,
-               (ybf->border + ybf->y_height - ybf->y_crop_height + 1) / 2,
-               (ybf->border + ybf->y_width - ybf->y_crop_width + 1) / 2);
+               ybf->uv_crop_width, ybf->uv_crop_height,
+               uv_border, uv_border,
+               uv_border + ybf->uv_height - ybf->uv_crop_height,
+               uv_border + ybf->uv_width - ybf->uv_crop_width);
 
   extend_plane(ybf->v_buffer, ybf->uv_stride,
-               (ybf->y_crop_width + 1) / 2, (ybf->y_crop_height + 1) / 2,
-               ybf->border / 2, ybf->border / 2,
-               (ybf->border + ybf->y_height - ybf->y_crop_height + 1) / 2,
-               (ybf->border + ybf->y_width - ybf->y_crop_width + 1) / 2);
+               ybf->uv_crop_width, ybf->uv_crop_height,
+               uv_border, uv_border,
+               uv_border + ybf->uv_height - ybf->uv_crop_height,
+               uv_border + ybf->uv_width - ybf->uv_crop_width);
 }
 
 #if CONFIG_VP9