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Fix a off-by-one bug

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

Change-Id: Id283d6e51a8b926015fd3fc631cdbfb4b8268d4a
This commit is contained in:
Yaowu Xu 2013-05-31 11:18:23 -07:00
parent 9068bce4e7
commit 0449ee0fec
1 changed files with 5 additions and 0 deletions
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5
vp9/common/vp9_tile_common.c
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@ -49,10 +49,15 @@ void vp9_get_tile_n_bits(VP9_COMMON *cm, int *min_log2_n_tiles_ptr,
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;
}