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Disable partitioning in the dominant subsampling direction.

E.g. disable vertical partioning for 4:2:2. Until we come up with something
better to do with the chroma block size, this prevents an assert error.

Change-Id: I9394fb3f14ec1343abc3ad4769de208e6278f285

--- a/vp9/encoder/vp9_encodeframe.c

+++ b/vp9/encoder/vp9_encodeframe.c

@@ -1567,10 +1567,14 @@

   // Override skipping rectangular partition operations for edge blocks

   const int force_horz_split = (mi_row + ms >= cm->mi_rows);

   const int force_vert_split = (mi_col + ms >= cm->mi_cols);

+  const int xss = x->e_mbd.plane[1].subsampling_x;

+  const int yss = x->e_mbd.plane[1].subsampling_y;

   int partition_none_allowed = !force_horz_split && !force_vert_split;

-  int partition_horz_allowed = !force_vert_split && bsize >= BLOCK_8X8;

-  int partition_vert_allowed = !force_horz_split && bsize >= BLOCK_8X8;

+  int partition_horz_allowed = !force_vert_split && yss <= xss &&

+                               bsize >= BLOCK_8X8;

+  int partition_vert_allowed = !force_horz_split && xss <= yss &&

+                               bsize >= BLOCK_8X8;

   int partition_split_done = 0;

   (void) *tp_orig;

-- 

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