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fix the mv_ref_idx issue

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The following issue was reported :
https://code.google.com/p/webm/issues/detail?id=601&q=jimbankoski&sort=-id&colspec=ID%20Pri%20mstone%20ReleaseBlock%20Type%20Component%20Status%20Owner%20Summary

This code makes the choice and code cleaner and removes any question
about whether the border needs to be checked.

Change-Id: Ia7aecfb3168e340618805bd318499176c2989597
This commit is contained in:
Jim Bankoski
2013-08-20 08:14:52 -07:00
parent c4048dbdd3
commit f167433d9c
1 changed files with 13 additions and 8 deletions
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21
vp9/common/vp9_mvref_common.c
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@@ -167,13 +167,15 @@ static INLINE int_mv scale_mv(const MB_MODE_INFO *mbmi, int ref,
// Checks that the given mi_row, mi_col and search point
// are inside the borders of the tile.
static INLINE int is_inside(int mi_col, int mi_row, int cur_tile_mi_col_start,
static INLINE int is_inside(int mi_col, int mi_row,
int cur_tile_mi_col_start,
int cur_tile_mi_col_end,
int mi_rows,
const MV *mv_ref) {
// Check that the candidate is within the border. We only need to check
// the left side because all the positive right side ones are for blocks that
// are large enough to support the + value they have within their border.
return !(mi_row + mv_ref->row < 0 ||
mi_col + mv_ref->col < cur_tile_mi_col_start);
mi_col + mv_ref->col < cur_tile_mi_col_start ||
mi_row + mv_ref->row >= mi_rows ||
mi_col + mv_ref->col >= cur_tile_mi_col_end);
}
// This function searches the neighbourhood of a given MB/SB
@@ -202,7 +204,8 @@ void vp9_find_mv_refs_idx(VP9_COMMON *cm, MACROBLOCKD *xd, MODE_INFO *here,
for (idx = 0; idx < 2; ++idx) {
const MV *mv_ref = &mv_ref_search[idx];
if (!is_inside(mi_col, mi_row, cm->cur_tile_mi_col_start, mv_ref))
if (!is_inside(mi_col, mi_row, cm->cur_tile_mi_col_start,
cm->cur_tile_mi_col_end, cm->mi_rows, mv_ref))
continue;
candidate = here + mv_ref->col + mv_ref->row * xd->mode_info_stride;
@@ -230,7 +233,8 @@ void vp9_find_mv_refs_idx(VP9_COMMON *cm, MACROBLOCKD *xd, MODE_INFO *here,
// mode counts.
for (; idx < MVREF_NEIGHBOURS; ++idx) {
const MV *mv_ref = &mv_ref_search[idx];
if (!is_inside(mi_col, mi_row, cm->cur_tile_mi_col_start, mv_ref))
if (!is_inside(mi_col, mi_row, cm->cur_tile_mi_col_start,
cm->cur_tile_mi_col_end, cm->mi_rows, mv_ref))
continue;
candidate = here + mv_ref->col + mv_ref->row * xd->mode_info_stride;
@@ -261,7 +265,8 @@ void vp9_find_mv_refs_idx(VP9_COMMON *cm, MACROBLOCKD *xd, MODE_INFO *here,
if (different_ref_found) {
for (idx = 0; idx < MVREF_NEIGHBOURS; ++idx) {
const MV *mv_ref = &mv_ref_search[idx];
if (!is_inside(mi_col, mi_row, cm->cur_tile_mi_col_start, mv_ref))
if (!is_inside(mi_col, mi_row, cm->cur_tile_mi_col_start,
cm->cur_tile_mi_col_end, cm->mi_rows, mv_ref))
continue;
candidate = here + mv_ref->col + mv_ref->row * xd->mode_info_stride;