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Optimizing set_contexts() function.

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Inlining set_contexts_on_border() into set_contexts(). The only difference
is the additional check that "has_eob != 0" in addition to
"xd->mb_to_right_edge < 0" and "xd->mb_to_right_edge < 0". If has_eob == 0
then memset does the right thing and works faster.

Change-Id: I5206f767d729f758b14c667592b7034df4837d0e
This commit is contained in:
Dmitry Kovalev 2013-11-08 12:44:56 -08:00
parent 614effc0f6
commit 22a001988b
1 changed files with 33 additions and 44 deletions
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77
vp9/common/vp9_blockd.h
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@ -457,57 +457,46 @@ static void extend_for_intra(MACROBLOCKD *xd, BLOCK_SIZE plane_bsize,
}
}
}
static void set_contexts_on_border(const MACROBLOCKD *xd,
struct macroblockd_plane *pd,
BLOCK_SIZE plane_bsize,
int tx_size_in_blocks, int has_eob,
int aoff, int loff,
ENTROPY_CONTEXT *A, ENTROPY_CONTEXT *L) {
int mi_blocks_wide = num_4x4_blocks_wide_lookup[plane_bsize];
int mi_blocks_high = num_4x4_blocks_high_lookup[plane_bsize];
int above_contexts = tx_size_in_blocks;
int left_contexts = tx_size_in_blocks;
int pt;
// xd->mb_to_right_edge is in units of pixels * 8. This converts
// it to 4x4 block sizes.
if (xd->mb_to_right_edge < 0)
mi_blocks_wide += (xd->mb_to_right_edge >> (5 + pd->subsampling_x));
if (xd->mb_to_bottom_edge < 0)
mi_blocks_high += (xd->mb_to_bottom_edge >> (5 + pd->subsampling_y));
// this code attempts to avoid copying into contexts that are outside
// our border. Any blocks that do are set to 0...
if (above_contexts + aoff > mi_blocks_wide)
above_contexts = mi_blocks_wide - aoff;
if (left_contexts + loff > mi_blocks_high)
left_contexts = mi_blocks_high - loff;
for (pt = 0; pt < above_contexts; pt++)
A[pt] = has_eob;
for (pt = above_contexts; pt < tx_size_in_blocks; pt++)
A[pt] = 0;
for (pt = 0; pt < left_contexts; pt++)
L[pt] = has_eob;
for (pt = left_contexts; pt < tx_size_in_blocks; pt++)
L[pt] = 0;
}
static void set_contexts(const MACROBLOCKD *xd, struct macroblockd_plane *pd,
BLOCK_SIZE plane_bsize, TX_SIZE tx_size,
int has_eob, int aoff, int loff) {
ENTROPY_CONTEXT *const A = pd->above_context + aoff;
ENTROPY_CONTEXT *const L = pd->left_context + loff;
ENTROPY_CONTEXT *const a = pd->above_context + aoff;
ENTROPY_CONTEXT *const l = pd->left_context + loff;
const int tx_size_in_blocks = 1 << tx_size;
if (xd->mb_to_right_edge < 0 || xd->mb_to_bottom_edge < 0) {
set_contexts_on_border(xd, pd, plane_bsize, tx_size_in_blocks, has_eob,
aoff, loff, A, L);
// above
if (has_eob && xd->mb_to_right_edge < 0) {
int i;
const int blocks_wide = num_4x4_blocks_wide_lookup[plane_bsize] +
(xd->mb_to_right_edge >> (5 + pd->subsampling_x));
int above_contexts = tx_size_in_blocks;
if (above_contexts + aoff > blocks_wide)
above_contexts = blocks_wide - aoff;
for (i = 0; i < above_contexts; ++i)
a[i] = has_eob;
for (i = above_contexts; i < tx_size_in_blocks; ++i)
a[i] = 0;
} else {
vpx_memset(A, has_eob, sizeof(ENTROPY_CONTEXT) * tx_size_in_blocks);
vpx_memset(L, has_eob, sizeof(ENTROPY_CONTEXT) * tx_size_in_blocks);
vpx_memset(a, has_eob, sizeof(ENTROPY_CONTEXT) * tx_size_in_blocks);
}
// left
if (has_eob && xd->mb_to_bottom_edge < 0) {
int i;
const int blocks_high = num_4x4_blocks_high_lookup[plane_bsize] +
(xd->mb_to_bottom_edge >> (5 + pd->subsampling_y));
int left_contexts = tx_size_in_blocks;
if (left_contexts + loff > blocks_high)
left_contexts = blocks_high - loff;
for (i = 0; i < left_contexts; ++i)
l[i] = has_eob;
for (i = left_contexts; i < tx_size_in_blocks; ++i)
l[i] = 0;
} else {
vpx_memset(l, has_eob, sizeof(ENTROPY_CONTEXT) * tx_size_in_blocks);
}
}