shithub: libvpx

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Fix a off-by-one bug

in the calculation of maximum number of tiles in log2 scale.

Change-Id: Id283d6e51a8b926015fd3fc631cdbfb4b8268d4a

--- a/vp9/common/vp9_tile_common.c

+++ b/vp9/common/vp9_tile_common.c

@@ -49,10 +49,15 @@

   for (max_log2_n_tiles = 0;

        (sb_cols >> max_log2_n_tiles) >= MIN_TILE_WIDTH_SBS;

        max_log2_n_tiles++) {}

+  max_log2_n_tiles--;

+  if (max_log2_n_tiles <  0)

+    max_log2_n_tiles = 0;

+

   for (min_log2_n_tiles = 0;

        (MAX_TILE_WIDTH_SBS << min_log2_n_tiles) < sb_cols;

        min_log2_n_tiles++) {}

+  assert(max_log2_n_tiles >= min_log2_n_tiles);

   *min_log2_n_tiles_ptr = min_log2_n_tiles;

   *delta_log2_n_tiles = max_log2_n_tiles - min_log2_n_tiles;

 }