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fix off-by-1 diff in case cropping and simple filtering

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Change-Id: I6dea172d0cf129f9986b8a3e1eea85fa97a70402
This commit is contained in:
Pascal Massimino 2011-12-05 08:37:55 -08:00
parent 2f741d1e13
commit 273a12a013
1 changed files with 7 additions and 2 deletions
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9
src/dec/frame.c
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@ -480,8 +480,13 @@ VP8StatusCode VP8EnterCritical(VP8Decoder* const dec, VP8Io* const io) {
dec->tl_mb_y_ = 0;
} else {
// For simple filter, we can filter only the cropped region.
dec->tl_mb_y_ = io->crop_top >> 4;
dec->tl_mb_x_ = io->crop_left >> 4;
// We include 'extra_pixels' on the other side of the boundary, since
// vertical or horizontal filtering of the previous macroblock can
// modify some abutting pixels.
dec->tl_mb_x_ = (io->crop_left - extra_pixels) >> 4;
dec->tl_mb_y_ = (io->crop_top - extra_pixels) >> 4;
if (dec->tl_mb_x_ < 0) dec->tl_mb_x_ = 0;
if (dec->tl_mb_y_ < 0) dec->tl_mb_y_ = 0;
}
// We need some 'extra' pixels on the right/bottom.
dec->br_mb_y_ = (io->crop_bottom + 15 + extra_pixels) >> 4;