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SATURATE_U8 -> clip_uint8 (10% faster loop filter)

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Originally committed as revision 4262 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2005-05-17 20:30:22 +00:00
parent 0bde73d907
commit ee408eadba
1 changed files with 4 additions and 6 deletions
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10
libavcodec/vp3.c
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@ -2245,8 +2245,6 @@ av_log(s->avctx, AV_LOG_ERROR, " help! got beefy vector! (%X, %X)\n", motion_x,
emms_c();
}
#define SATURATE_U8(x) ((x) < 0) ? 0 : ((x) > 255) ? 255 : x
static void horizontal_filter(unsigned char *first_pixel, int stride,
int *bounding_values)
{
@ -2260,8 +2258,8 @@ static void horizontal_filter(unsigned char *first_pixel, int stride,
(first_pixel[ 0] * 3) -
(first_pixel[ 1] * 1);
filter_value = bounding_values[(filter_value + 4) >> 3];
first_pixel[-1] = SATURATE_U8(first_pixel[-1] + filter_value);
first_pixel[ 0] = SATURATE_U8(first_pixel[ 0] - filter_value);
first_pixel[-1] = clip_uint8(first_pixel[-1] + filter_value);
first_pixel[ 0] = clip_uint8(first_pixel[ 0] - filter_value);
}
}
@ -2278,8 +2276,8 @@ static void vertical_filter(unsigned char *first_pixel, int stride,
(first_pixel[ (0 )] * 3) -
(first_pixel[ (1 * stride)] * 1);
filter_value = bounding_values[(filter_value + 4) >> 3];
first_pixel[-(1 * stride)] = SATURATE_U8(first_pixel[-(1 * stride)] + filter_value);
first_pixel[0] = SATURATE_U8(first_pixel[0] - filter_value);
first_pixel[-(1 * stride)] = clip_uint8(first_pixel[-(1 * stride)] + filter_value);
first_pixel[0] = clip_uint8(first_pixel[0] - filter_value);
}
}