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Optimize overlapping

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Suggested by Skal, sprintf(mail, "skal%d@orange.fr", 0xFFFF)

Originally committed as revision 7113 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2006-11-17 06:12:33 +00:00
parent 7ad8d3bf0c
commit b615c1edfc
1 changed files with 14 additions and 8 deletions
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22
libavcodec/vc1dsp.c
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@ -35,16 +35,19 @@ static void vc1_v_overlap_c(uint8_t* src, int stride, int rnd)
{
int i;
int a, b, c, d;
int d1, d2;
for(i = 0; i < 8; i++) {
a = src[-2*stride];
b = src[-stride];
c = src[0];
d = src[stride];
d1 = (a - d + 3 + rnd) >> 3;
d2 = (a - d + b - c + 4 - rnd) >> 3;
src[-2*stride] = clip_uint8((7*a + d + 4 - rnd) >> 3);
src[-stride] = clip_uint8((-a + 7*b + c + d + 3 + rnd) >> 3);
src[0] = clip_uint8((a + b + 7*c - d + 4 - rnd) >> 3);
src[stride] = clip_uint8((a + 7*d + 3 + rnd) >> 3);
src[-2*stride] = a - d1;
src[-stride] = b - d2;
src[0] = c + d2;
src[stride] = d + d1;
src++;
}
}
@ -55,16 +58,19 @@ static void vc1_h_overlap_c(uint8_t* src, int stride, int rnd)
{
int i;
int a, b, c, d;
int d1, d2;
for(i = 0; i < 8; i++) {
a = src[-2];
b = src[-1];
c = src[0];
d = src[1];
d1 = (a - d + 3 + rnd) >> 3;
d2 = (a - d + b - c + 4 - rnd) >> 3;
src[-2] = clip_uint8((7*a + d + 4 - rnd) >> 3);
src[-1] = clip_uint8((-a + 7*b + c + d + 3 + rnd) >> 3);
src[0] = clip_uint8((a + b + 7*c - d + 4 - rnd) >> 3);
src[1] = clip_uint8((a + 7*d + 3 + rnd) >> 3);
src[-2] = a - d1;
src[-1] = b - d2;
src[0] = c + d2;
src[1] = d + d1;
src += stride;
}
}