shithub: libvpx

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Fix partition coding of corner block

This commit fixed the allowable partition types for bottom-right
corner blocks.

When a block has over half of its pixels as valid content in both
vertical and horizontal directions, allow all the four partition
types in the bit-stream. Otherwise, apply partition type constraints.

Change-Id: I2252e2de7125a8bfb1c824bf34299a13c81102e3

--- a/vp9/common/vp9_onyxc_int.h

+++ b/vp9/common/vp9_onyxc_int.h

@@ -313,10 +313,8 @@

   int bsl = mi_width_log2(bsize), bs = 1 << bsl;

   int ms = bs / 2;

-  if ((mi_row + bs <= cm->mi_rows) && (mi_col + ms < cm->mi_cols))

+  if ((mi_row + ms < cm->mi_rows) && (mi_col + ms < cm->mi_cols))

     return 0;

-  if ((mi_col + bs <= cm->mi_cols) && (mi_row + ms < cm->mi_rows))

-    return 0;

   // frame width/height are multiples of 8, hence 8x8 block should always

   // pass the above check

@@ -323,9 +321,11 @@

   assert(bsize > BLOCK_SIZE_SB8X8);

   // return the node index in the prob tree for binary coding

-  if ((mi_col + bs <= cm->mi_cols) && (mi_row + ms >= cm->mi_rows))

+  // skip horizontal/none partition types

+  if ((mi_col + ms < cm->mi_cols) && (mi_row + ms >= cm->mi_rows))

     return 1;

-  if ((mi_row + bs <= cm->mi_rows) && (mi_col + ms >= cm->mi_cols))

+  // skip vertical/none partition types

+  if ((mi_row + ms < cm->mi_rows) && (mi_col + ms >= cm->mi_cols))

     return 2;

   return -1;

-- 

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