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| author | Yaowu Xu <yaowu@google.com> | 2012-02-15 17:35:48 -0800 |
|---|---|---|
| committer | Yaowu Xu <yaowu@google.com> | 2012-02-16 07:03:57 -0800 |
| commit | efa9abd02891855afc40670cc874922a5c1fcb1b (patch) | |
| tree | aab39e4d8e5d4faaad9febf21cd7fca7cbcf62c2 /vp8/common | |
| parent | 62a78f0342ca45fc295aa63bbc4d6974b0c57da7 (diff) | |
| download | libvpx-efa9abd02891855afc40670cc874922a5c1fcb1b.tar libvpx-efa9abd02891855afc40670cc874922a5c1fcb1b.tar.gz libvpx-efa9abd02891855afc40670cc874922a5c1fcb1b.tar.bz2 libvpx-efa9abd02891855afc40670cc874922a5c1fcb1b.zip | |
optmized rounding for transforms
the changes are still temporary, the final transforms, especially
inverse ones should take in account both accuracy, complexity, and
sign-bias, which should be decided at a later time.
Change-Id: I116b0c70b25f5ee324ae5713d4564f5d0aa27151
Diffstat (limited to 'vp8/common')
| -rw-r--r-- | vp8/common/idctllm.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/vp8/common/idctllm.c b/vp8/common/idctllm.c index e21af6871..8097c4fb1 100644 --- a/vp8/common/idctllm.c +++ b/vp8/common/idctllm.c @@ -396,7 +396,8 @@ void vp8_short_idct8x8_c(short *coefs, short *block, int pitch) { for (j = 0; j < TX_DIM; j++) { - X[i * TX_DIM + j] = (int)(coefs[i * TX_DIM + j]+2)>>2; + X[i * TX_DIM + j] = (int)(coefs[i * TX_DIM + j]+1 + + (coefs[i * TX_DIM + j]<0))>>2; } } for (i = 0; i < 8; i++) @@ -487,7 +488,7 @@ void vp8_short_ihaar2x2_c(short *input, short *output, int pitch) op[i] = 0; } - op[0] = (ip[0] + ip[1] + ip[4] + ip[8])>>1; + op[0] = (ip[0] + ip[1] + ip[4] + ip[8] + 1)>>1; op[1] = (ip[0] - ip[1] + ip[4] - ip[8])>>1; op[4] = (ip[0] + ip[1] - ip[4] - ip[8])>>1; op[8] = (ip[0] - ip[1] - ip[4] + ip[8])>>1; |