From b615c1edfcdf9fabfc1b92a3b155a7bce6543153 Mon Sep 17 00:00:00 2001
From: Kostya Shishkov <kostya.shishkov@gmail.com>
Date: Fri, 17 Nov 2006 06:12:33 +0000
Subject: [PATCH] Optimize overlapping Suggested by Skal, sprintf(mail,
"skal%d@orange.fr", 0xFFFF)
Originally committed as revision 7113 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
libavcodec/vc1dsp.c | 22 ++++++++++++++--------
1 file changed, 14 insertions(+), 8 deletions(-)
diff --git a/libavcodec/vc1dsp.c b/libavcodec/vc1dsp.c
index b488f2ca0ba..518a690d3ab 100644
--- a/libavcodec/vc1dsp.c
+++ b/libavcodec/vc1dsp.c
@@ -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;
}
}
--
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