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get rid of idiotc double subtraction 

Originally committed as revision 10154 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2007-08-20 22:18:26 +00:00
parent 4a0d6686fd
commit 49ca0e531a
1 changed files with 2 additions and 2 deletions
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4
libavcodec/snow.c
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@ -775,7 +775,7 @@ static av_always_inline void liftS(DWTELEM *dst, DWTELEM *src, DWTELEM *ref, int
int i;
assert(shift == 4);
#define LIFTS(src, ref, inv) ((inv) ? (src) - (((ref) - 4*(src))>>shift): (16*4*(src) + 4*(ref) + 8 + (5<<27))/(5*16) - (1<<23))
#define LIFTS(src, ref, inv) ((inv) ? (src) + (((ref) + 4*(src))>>shift): (16*4*(src) + 4*(ref) + 8 + (5<<27))/(5*16) - (1<<23))
if(mirror_left){
dst[0] = LIFTS(src[0], mul*2*ref[0]+add, inverse);
dst += dst_step;
@ -1344,7 +1344,7 @@ void ff_snow_horizontal_compose97i(DWTELEM *b, int width){
lift (temp , b , b +w2, 1, 1, 1, width, W_DM, W_DO, W_DS, 0, 1);
lift5(temp+w2, b +w2, temp , 1, 1, 1, width, W_CM, W_CO, W_CS, 1, 1);
liftS(b , temp , temp+w2, 2, 1, 1, width, -W_BM, W_BO, W_BS, 0, 1);
liftS(b , temp , temp+w2, 2, 1, 1, width, W_BM, W_BO-1, W_BS, 0, 1);
lift (b+1 , temp+w2, b , 2, 1, 2, width, -W_AM, W_AO, W_AS, 1, 1);
}