tree 47e70c44af009de410a1818194f1bd049695264c
parent 528847557cd0e01c9948a6e7e2cc35e354472d29
author Rupert Swarbrick <rupert.swarbrick@argondesign.com> 1504263955 +0100
committer Debargha Mukherjee <debargha@google.com> 1504634028 +0000

Allow tile_rows/tile_cols to not be a power of 2

The example bitstream in bug 710 shows what might go on. This has a
frame with mi_cols=540 and log2_tile_cols=3. But 540/8 = 67.5, which
gets rounded up to give a tile_width of 5*16=80. However, 540/80 =
6.75 which means that the frame finishes somewhere in the middle of
tile 7 (and tile 8 is completely empty).

This patch clamps tile_rows/tile_cols to ensure that can't happen. The
bitstream still signals ceil(log2(tile_<rows/cols>)) so there's no
change there.

BUG=aomedia:710

Change-Id: Idfad658ef59cf71674100f5e74bd53dd192c6a84