shithub: libvpx

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Remove unnecessary mv clamp with on demand border extension.

Change-Id: Ia2956f06f409b9b0ca8320ca4c1ea5680e938402

--- a/vp9/decoder/vp9_decodeframe.c

+++ b/vp9/decoder/vp9_decodeframe.c

@@ -1816,9 +1816,6 @@

                                 int is_scaled, int ref) {

   struct macroblockd_plane *const pd = &xd->plane[plane];

   uint8_t *const dst = dst_buf->buf + dst_buf->stride * y + x;

-  const MV mv_q4 = clamp_mv_to_umv_border_sb(xd, mv, bw, bh,

-                                             pd->subsampling_x,

-                                             pd->subsampling_y);

   MV32 scaled_mv;

   int xs, ys, x0, y0, x0_16, y0_16, frame_width, frame_height,

       buf_stride, subpel_x, subpel_y;

@@ -1837,6 +1834,9 @@

   }

   if (is_scaled) {

+    const MV mv_q4 = clamp_mv_to_umv_border_sb(xd, mv, bw, bh,

+                                               pd->subsampling_x,

+                                               pd->subsampling_y);

     // Co-ordinate of containing block to pixel precision.

     int x_start = (-xd->mb_to_left_edge >> (3 + pd->subsampling_x));

     int y_start = (-xd->mb_to_top_edge >> (3 + pd->subsampling_y));

@@ -1868,8 +1868,8 @@

     x0_16 = x0 << SUBPEL_BITS;

     y0_16 = y0 << SUBPEL_BITS;

-    scaled_mv.row = mv_q4.row;

-    scaled_mv.col = mv_q4.col;

+    scaled_mv.row = mv->row * (1 << (1 - pd->subsampling_y));

+    scaled_mv.col = mv->col * (1 << (1 - pd->subsampling_x));

     xs = ys = 16;

   }

   subpel_x = scaled_mv.col & SUBPEL_MASK;

-- 

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